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Magnetisation and Magnetic Properties of Materials – Complete Class 12 Physics Notes
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1. Introduction
Magnetisation and Magnetic Properties of Materials is based on NCERT Class 12 Physics concepts from Magnetism and Matter. This topic explains how materials behave when placed in a magnetic field and why some materials are weakly repelled, some weakly attracted and some strongly magnetised.
Magnetisation
Magnetic intensity
Magnetic susceptibility
Magnetic permeability
Relative permeability
Diamagnetism
Paramagnetism
Ferromagnetism
Hysteresis
Retentivity
Coercivity
Domains
Permanent magnets
Electromagnets
2. Basic Magnetic Quantities
Magnetisation is magnetic dipole moment per unit volume. Magnetic intensity H is the magnetising field. Susceptibility tells how easily a material gets magnetised.
Magnetisation
M = m_net/VMagnetic susceptibility
χ = M/HMagnetic permeability
B = μHRelative permeability
μ = μ₀ μrRelation of μr and χ
μr = μ/μ₀B-H-M relation
B = μ₀(H + M)Linear material
M = χHFinal relation
μr = 1 + χ1Start with B = μ₀(H + M).
2For a linear magnetic material, M = χH.
3Substitute M in B = μ₀(H + M).
4B = μ₀(H + χH) = μ₀(1+χ)H.
5But B = μH = μ₀μrH.
6Therefore μr = 1 + χ.
3. Diamagnetic Materials
Original classroom SVG diagram redrawn for Kumar Physics Classes notes. NCERT Class 12 Physics concept flow used as reference.
Diamagnetic materials are weakly repelled by a magnetic field. Their induced magnetisation is opposite to the applied magnetic field, so susceptibility is small and negative.
Diamagnetic susceptibility
χ < 0Relative permeability
μr < 1Examples: bismuth, copper, silver, gold, water, mercury and quartz. Diamagnetism is approximately independent of temperature.
4. Paramagnetic Materials
Original classroom SVG diagram redrawn for Kumar Physics Classes notes. NCERT Class 12 Physics concept flow used as reference.
Paramagnetic materials are weakly attracted by magnetic field. They contain permanent magnetic dipoles which partially align in the direction of applied magnetic field.
Paramagnetic susceptibility
χ > 0 but smallRelative permeability
μr > 1 but slightlyCurie Law
χ = C/TExamples: aluminium, platinum, chromium, manganese and oxygen. Susceptibility decreases with temperature.
5. Ferromagnetic Materials
Original classroom SVG diagram redrawn for Kumar Physics Classes notes. NCERT Class 12 Physics concept flow used as reference.
Ferromagnetic materials are strongly attracted by magnetic fields. Their magnetic domains align strongly in the field direction, producing very large magnetisation.
Ferromagnetic susceptibility
χ >> 1Relative permeability
μr >> 1Examples: iron, cobalt, nickel, gadolinium, steel and alnico.
6. Magnetic Domain Theory
Original classroom SVG diagram redrawn for Kumar Physics Classes notes. NCERT Class 12 Physics concept flow used as reference.
Ferromagnetic materials are divided into small regions called domains. In each domain, atomic magnetic moments are aligned. In the unmagnetised state, domains are randomly oriented and net magnetisation is nearly zero. In an external magnetic field, domains rotate and grow in the field direction.
7. Comparison Table
| Property | Diamagnetic | Paramagnetic | Ferromagnetic |
|---|---|---|---|
| Nature | Weakly repelled | Weakly attracted | Strongly attracted |
| Susceptibility | Small negative | Small positive | Very large positive |
| Relative permeability | Slightly less than 1 | Slightly greater than 1 | Much greater than 1 |
| Magnetisation direction | Opposite to field | Along field | Strongly along field |
| Temperature dependence | Nearly independent | Follows Curie law | Becomes paramagnetic above Curie temperature |
| Examples | Bi, Cu, water | Al, Pt, O₂ | Fe, Co, Ni |
| Hysteresis | No | No | Yes |
8. Hysteresis
Original classroom SVG diagram redrawn for Kumar Physics Classes notes. NCERT Class 12 Physics concept flow used as reference.
Hysteresis is the lagging of magnetisation B or M behind magnetising field H when a ferromagnetic material is taken through a complete cycle of magnetisation. The loop must show saturation, retentivity, coercivity and hysteresis loss.
9. Retentivity and Coercivity
Original classroom SVG diagram redrawn for Kumar Physics Classes notes. NCERT Class 12 Physics concept flow used as reference.
Retentivity is the ability to retain magnetisation after external magnetising field is removed. Coercivity is the reverse magnetising field required to reduce residual magnetisation to zero.
High retentivity: needed for permanent magnets.
Low retentivity: useful for transformer cores.
High coercivity: resists demagnetisation.
Low coercivity: easy magnetisation and demagnetisation.
10. Hysteresis Loss
Energy loss per unit volume per cycle is equal to area of the B-H hysteresis loop. Larger loop area means larger energy loss as heat.
Hysteresis loss per unit volume per cycle
Area of B-H loopTotal hysteresis loss
volume × frequency × area of loopTo reduce hysteresis loss, use soft magnetic materials such as soft iron or silicon steel with narrow hysteresis loop and low coercivity.
11. Permanent Magnets and Electromagnets
Original classroom SVG diagram redrawn for Kumar Physics Classes notes. NCERT Class 12 Physics concept flow used as reference.
| Feature | Permanent Magnet | Electromagnet Core |
|---|---|---|
| Retentivity | High | Low |
| Coercivity | High | Low |
| Loop | Wide loop | Narrow loop |
| Examples | Steel, Alnico, hard ferrites | Soft iron, silicon steel |
| Use | Permanent magnets | Transformers, relays, electromagnets |
12. Demagnetisation
Demagnetisation means loss of magnetic alignment. It can be caused by heating, hammering, dropping repeatedly, applying alternating magnetic field of decreasing amplitude or storing a magnet improperly. Heating increases thermal agitation and hammering gives mechanical shock, both disturbing domain alignment.
13. Eddy Current Loss and Its Reduction
In changing magnetic fields, circulating currents are induced in bulk conductor cores. These are eddy currents and cause heating loss. Eddy current loss is reduced using laminated cores, thin insulated sheets, high-resistivity core materials and ferrites.
Hysteresis loss: repeated magnetisation cycle.
Eddy current loss: induced circulating currents.
14. Curie Temperature
Above Curie temperature, a ferromagnetic material becomes paramagnetic because domain alignment is destroyed by thermal agitation. Iron, nickel and cobalt have characteristic Curie temperatures.
15. Important NCERT-Style Concepts
Magnetic susceptibility
Magnetic permeability
Relative permeability
μ = μ₀μr
μr = 1 + χ
B = μ₀(H + M)
M = χH
Diamagnetism
Paramagnetism
Ferromagnetism
Hysteresis curve
Retentivity
Coercivity
Permanent magnet material
Electromagnet core material
Domain theory
Curie Law
Curie temperature
16. Numerical Formulas and Solved Problems
Magnetisation
M = m/VSusceptibility
χ = M/HMagnetisation relation
M = χHMaterial field
B = μ₀(H+M)Permeability
B = μHRelative permeability
μ = μ₀μrSusceptibility relation
μr = 1+χCurie law
χ = C/THysteresis loss/cycle/volume
area of B-H loopTotal hysteresis loss
volume × frequency × area1If M and H are given, compute χ = M/H.
2If χ is given, compute μr = 1+χ.
3If H and M are given, compute B = μ₀(H+M).
4For Curie law, χT = constant.
5For hysteresis loss, multiply loop area by volume and frequency.
17. Applications
Transformer cores
Permanent magnets
Electromagnets
Magnetic recording
MRI
Motors
Generators
Relays
Magnetic shielding
Inductors
Ferrites in electronics
18. Common Student Mistakes
Mistake 1Confusing B, H and M
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 2Forgetting χ is dimensionless
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 3Writing susceptibility positive for diamagnetic materials
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 4Confusing retentivity with coercivity
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 5Confusing hysteresis loss with eddy current loss
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 6Thinking ferromagnetic materials always remain magnetised
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 7Forgetting μr = 1 + χ
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 8Confusing soft iron and steel usage
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 9Drawing wrong hysteresis loop
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
Mistake 10Forgetting area of loop represents energy loss
Correction: first identify material type, then use correct sign of χ and correct graph interpretation.
19. Exam Question Bank With Solutions
Click any question to open complete answer and explanation.
A. CBSE Board Theory Questions
CBSE Theory Question 1Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 2Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 3Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 4Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 5Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 6Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 7Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 8Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 9Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 10Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 11Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 12Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 13Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 14Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 15Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 16Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 17Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 18Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 19Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 20Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 21Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 22Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 23Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 24Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 25Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 26Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 27Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 28Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 29Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Theory Question 30Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
A. CBSE Board Derivation / Formula Questions
CBSE Formula Question 1Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 2Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 3Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 4Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 5Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 6Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 7Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 8Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 9Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 10Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 11Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 12Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 13Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 14Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 15Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 16Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 17Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 18Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 19Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
CBSE Formula Question 20Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
A. CBSE Board Numerical Questions
CBSE Numerical Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 16Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 17A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 18For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 19Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 20A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 21Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 22Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 23Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 24Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 25A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 26For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 27Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 28A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 29Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
CBSE Numerical Question 30Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
A. CBSE Case-Study Questions
Case Study 1Case study based on transformer core material.
Scenario: A student studies transformer core material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 2Case study based on permanent magnet material.
Scenario: A student studies permanent magnet material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 3Case study based on electromagnet core.
Scenario: A student studies electromagnet core in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 4Case study based on hysteresis loss.
Scenario: A student studies hysteresis loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 5Case study based on eddy current loss.
Scenario: A student studies eddy current loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 6Case study based on magnetic domains.
Scenario: A student studies magnetic domains in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 7Case study based on Curie temperature.
Scenario: A student studies Curie temperature in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 8Case study based on diamagnetic levitation.
Scenario: A student studies diamagnetic levitation in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 9Case study based on magnetic shielding.
Scenario: A student studies magnetic shielding in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 10Case study based on susceptibility measurement.
Scenario: A student studies susceptibility measurement in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 11Case study based on transformer core material.
Scenario: A student studies transformer core material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 12Case study based on permanent magnet material.
Scenario: A student studies permanent magnet material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 13Case study based on electromagnet core.
Scenario: A student studies electromagnet core in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 14Case study based on hysteresis loss.
Scenario: A student studies hysteresis loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 15Case study based on eddy current loss.
Scenario: A student studies eddy current loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
B. NEET Tough MCQs
NEET Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 16Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 17A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 18For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 19Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 20A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 21Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 22Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 23Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 24Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 25A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 26For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 27Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 28A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 29Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 30Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 31Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 32Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 33A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 34For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 35Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 36A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 37Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 38Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 39Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 40Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 41A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 42For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 43Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 44A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 45Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 46Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 47Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 48Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 49A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 50For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 51Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 52A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 53Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 54Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 55Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 56Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 57A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 58For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 59Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 60A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 61Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 62Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 63Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 64Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 65A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 66For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 67Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 68A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 69Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 70Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 71Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 72Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 73A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 74For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 75Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 76A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 77Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 78Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 79Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 80Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 81A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 82For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 83Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 84A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 85Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 86Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 87Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 88Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 89A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 90For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 91Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 92A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 93Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 94Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 95Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 96Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 97A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 98For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 99Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
NEET Question 100A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
C. JEE Main MCQs
JEE Main Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 16Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 17A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 18For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 19Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 20A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 21Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 22Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 23Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 24Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 25A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 26For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 27Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 28A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 29Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 30Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 31Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 32Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 33A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 34For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 35Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 36A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 37Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 38Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 39Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 40Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 41A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 42For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 43Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 44A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 45Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 46Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 47Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 48Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 49A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 50For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 51Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 52A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 53Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 54Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 55Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 56Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 57A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 58For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 59Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 60A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 61Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 62Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 63Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 64Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 65A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 66For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 67Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 68A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 69Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 70Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 71Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 72Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 73A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 74For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 75Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 76A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 77Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 78Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 79Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 80Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 81A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 82For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 83Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 84A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 85Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 86Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 87Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 88Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 89A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 90For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 91Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 92A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 93Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 94Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 95Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 96Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 97A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 98For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 99Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Main Question 100A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Medium
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
D. JEE Advanced Single-Correct Questions
JEE Advanced Single Correct Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 16Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 17A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 18For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 19Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 20A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 21Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 22Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 23Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 24Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 25A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 26For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 27Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 28A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 29Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 30Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 31Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 32Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 33A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 34For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 35Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 36A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 37Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 38Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 39Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Single Correct Question 40Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
D. JEE Advanced Multiple-Correct Questions
JEE Advanced Multiple Correct Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 16Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 17A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 18For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 19Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 20A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 21Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 22Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 23Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 24Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 25A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 26For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 27Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 28A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 29Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Multiple Correct Question 30Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
D. JEE Advanced Integer-Type Questions
JEE Advanced Integer Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 16Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 17A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 18For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 19Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Integer Question 20A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
D. JEE Advanced Matrix-Match Questions
JEE Advanced Matrix Match Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Matrix Match Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
D. JEE Advanced Paragraph-Type Questions
JEE Advanced Paragraph Question 1A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 2For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 3Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 4A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 5Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 6Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 7Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 8Paramagnetic susceptibility varies with temperature according to
A) χ = CT
B) χ = C/T
C) χ = T/C
D) χ independent always
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie law
Detailed Explanation: Curie law for paramagnets is χ = C/T.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 9A material has small negative magnetic susceptibility. It is
A) diamagnetic
B) paramagnetic
C) ferromagnetic
D) superconducting only
Correct Answer: A
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Diamagnetism
Detailed Explanation: Diamagnetic materials have χ < 0 and μr slightly less than 1.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 10For a linear magnetic material, the correct relation is
A) μr = 1 + χ
B) μr = 1 - χ
C) χ = μ₀/H
D) M = B/H
Correct Answer: A
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: B-H-M relation
Detailed Explanation: Using B = μ₀(H+M) and M = χH gives μr = 1+χ.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 11Area of B-H hysteresis loop represents
A) power factor
B) energy loss per unit volume per cycle
C) magnetic flux only
D) retentivity only
Correct Answer: B
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Hysteresis loss
Detailed Explanation: The loop area equals hysteresis energy loss per unit volume per cycle.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 12A good transformer core should have
A) wide hysteresis loop
B) high coercivity
C) narrow hysteresis loop
D) large retentivity
Correct Answer: C
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Material selection
Detailed Explanation: Transformer core should have low hysteresis loss, so a narrow loop is required.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 13Above Curie temperature, ferromagnetic material becomes
A) diamagnetic
B) paramagnetic
C) perfect conductor
D) superconductor
Correct Answer: B
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Curie temperature
Detailed Explanation: Thermal agitation destroys domain alignment and the material behaves paramagnetically.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 14Retentivity is
A) ability to retain magnetisation
B) reverse field to reduce magnetisation to zero
C) loop area
D) magnetic flux density
Correct Answer: A
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Retentivity
Detailed Explanation: Retentivity is residual magnetism after H is removed.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
JEE Advanced Paragraph Question 15Coercivity is
A) maximum B
B) reverse H needed to reduce residual B to zero
C) μ/μ₀
D) M/H
Correct Answer: B
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
Difficulty: Difficult
Concept Tested: Coercivity
Detailed Explanation: Coercive field Hc measures resistance to demagnetisation.
Common trap: Students often confuse material type, sign of susceptibility and hysteresis graph labels.
E. IB Physics Structured Questions
IB Physics Question 1Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 2Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 3Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 4Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 5Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 6Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 7Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 8Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 9Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 10Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 11Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 12Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 13Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 14Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 15Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 16Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 17Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 18Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 19Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 20Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 21Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 22Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 23Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 24Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 25Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 26Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 27Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 28Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 29Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
IB Physics Question 30Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
F. ICSE Physics Questions
ICSE Physics Question 1Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 2Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 3Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 4Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 5Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 6Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 7Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 8Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 9Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 10Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 11Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 12Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 13Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 14Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 15Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 16Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 17Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 18Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 19Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 20Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 21Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 22Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 23Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 24Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 25Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 26Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 27Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 28Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 29Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
ICSE Physics Question 30Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
G. IGCSE Physics Questions
IGCSE Physics Question 1Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 2Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 3Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 4Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 5Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 6Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 7Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 8Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 9Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 10Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 11Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 12Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 13Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 14Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 15Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 16Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 17Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 18Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 19Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 20Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 21Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 22Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 23Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 24Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 25Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 26Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 27Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 28Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 29Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
IGCSE Physics Question 30Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
H. British Curriculum / A-Level Physics
A-Level Physics Question 1Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 2Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 3Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 4Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 5Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 6Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 7Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 8Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 9Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 10Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 11Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 12Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 13Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 14Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 15Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 16Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 17Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 18Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 19Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 20Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 21Explain magnetisation and magnetic intensity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetisation and magnetic intensity, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 22Explain magnetic susceptibility and relative permeability with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For magnetic susceptibility and relative permeability, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 23Explain diamagnetic materials with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For diamagnetic materials, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 24Explain paramagnetic materials and Curie law with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For paramagnetic materials and Curie law, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 25Explain ferromagnetic materials and domains with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For ferromagnetic materials and domains, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 26Explain B-H-M relation with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For B-H-M relation, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 27Explain hysteresis loop with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For hysteresis loop, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 28Explain retentivity and coercivity with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For retentivity and coercivity, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 29Explain permanent magnets and electromagnets with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For permanent magnets and electromagnets, connect material behaviour with susceptibility, permeability and domain alignment.
A-Level Physics Question 30Explain eddy current loss and hysteresis loss with formulas and examples.
Answer: Define the quantity, write the formula, mention unit where required, draw diagram if asked and explain the physical meaning. For eddy current loss and hysteresis loss, connect material behaviour with susceptibility, permeability and domain alignment.
20. Case Study Section
Case Study 1Case study based on transformer core material.
Scenario: A student studies transformer core material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 2Case study based on permanent magnet material.
Scenario: A student studies permanent magnet material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 3Case study based on electromagnet core.
Scenario: A student studies electromagnet core in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 4Case study based on hysteresis loss.
Scenario: A student studies hysteresis loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 5Case study based on eddy current loss.
Scenario: A student studies eddy current loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 6Case study based on magnetic domains.
Scenario: A student studies magnetic domains in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 7Case study based on Curie temperature.
Scenario: A student studies Curie temperature in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 8Case study based on diamagnetic levitation.
Scenario: A student studies diamagnetic levitation in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 9Case study based on magnetic shielding.
Scenario: A student studies magnetic shielding in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 10Case study based on susceptibility measurement.
Scenario: A student studies susceptibility measurement in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 11Case study based on transformer core material.
Scenario: A student studies transformer core material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 12Case study based on permanent magnet material.
Scenario: A student studies permanent magnet material in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 13Case study based on electromagnet core.
Scenario: A student studies electromagnet core in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 14Case study based on hysteresis loss.
Scenario: A student studies hysteresis loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 15Case study based on eddy current loss.
Scenario: A student studies eddy current loss in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 16Case study based on magnetic domains.
Scenario: A student studies magnetic domains in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 17Case study based on Curie temperature.
Scenario: A student studies Curie temperature in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 18Case study based on diamagnetic levitation.
Scenario: A student studies diamagnetic levitation in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 19Case study based on magnetic shielding.
Scenario: A student studies magnetic shielding in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Case Study 20Case study based on susceptibility measurement.
Scenario: A student studies susceptibility measurement in a laboratory or application.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
Solution: Identify whether material should have high/low retentivity, high/low coercivity, high/low permeability, wide/narrow hysteresis loop, or suitable susceptibility. Use μr = 1+χ, B = μ₀(H+M), and hysteresis loss = area of B-H loop where needed.
21. Final Revision Sheet
M
m_net/Vχ
M/HM
χHB
μ₀(H+M)B
μHμ
μ₀μrμr
1+χCurie law
χ=C/THysteresis loss
area of B-H loopTotal loss
V f × areaMaterial Selection Table
| Use | Material property needed | Example |
|---|---|---|
| Permanent magnet | High retentivity, high coercivity | Steel, Alnico |
| Electromagnet | High permeability, low retentivity | Soft iron |
| Transformer core | Narrow loop, low loss | Silicon steel |
| High-frequency core | High resistivity | Ferrite |
NEET trap: diamagnetic χ is negative.
JEE trap: area of loop is loss per unit volume per cycle.
CBSE trap: label Br and Hc correctly.
Advanced trap: hysteresis loss and eddy current loss are different.
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