Physics Tutor in Raysan Gandhinagar

+91-9958461445

If you are living in Raysan Gandhinagar and today your Physics test result has shocked you, do not panic. Maybe you scored 2 marks, 4 marks, 8 marks, or maybe you attempted the paper but could not understand what the question was asking. This happens with many students of Class 11, Class 12, NEET and IIT-JEE because Physics is not a subject of only formulas. Physics needs concept clarity, imagination, diagram reading, mathematical confidence and regular numerical practice.

Raysan is close to many education-focused areas like GIFT City, Kudasan, PDPU Road, Sargasan and Randesan. Students here dream big. Some want NEET. Some want IIT-JEE. Some want CBSE board excellence. Some want Gujarat Board marks. Some are preparing for IB, AP Physics or A-Level Physics. But the common problem is the same: concepts are not clear.

A student may know the formula of magnetic field, but when the question changes language, the answer disappears. A student may remember Biot-Savart Law, but when a circular loop, solenoid, moving charge or magnetic dipole appears, confusion starts. This is why a good Physics Tutor in Raysan Gandhinagar becomes important.

Kumar Sir focuses on concept clarity first. If a student is weak in basics, he does not directly jump to advanced questions. He first explains the meaning of current, charge, magnetic field, direction, right-hand thumb rule, field lines, torque and magnetic moment. Once the foundation becomes strong, NEET and IIT-JEE questions become easier.

Why Magnetic Properties Matter in NEET and IIT-JEE

Magnetic Properties of Matter is a small-looking chapter, but it connects deeply with Magnetism and Current Electricity. In NEET, direct conceptual questions often come from diamagnetic, paramagnetic and ferromagnetic materials. Students must know magnetic susceptibility, permeability, relative permeability, hysteresis, retentivity, coercivity and Curie temperature.

In IIT-JEE, the chapter becomes more analytical. Questions may connect magnetic field, magnetic moment, torque, potential energy and material behavior. If the student only memorizes definitions, he will struggle. But if the student understands why iron behaves differently from copper, why soft iron is used in electromagnets, why steel is used in permanent magnets, then the chapter becomes logical.

Physics is not fear. Physics is a language. Once Kumar Sir teaches the language, the same student who scored 2 or 4 marks can slowly start solving questions confidently.

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Contact Kumar Sir

If you live in Raysan Gandhinagar and Physics is not improving, contact Kumar Sir.

Kumar Physics Classes
Phone: +91-9958461445
Email: kumarsirphysics@gmail.com
Website: https://kumarphysicsclasses.com

Magnetic Properties of Materials

IIT-JEE & NEET Concept Booster

1. Magnetic Susceptibility

Magnetic susceptibility is the property of a material which tells how strongly it gets magnetised when placed in an external magnetic field.

χ = M / H

Here, χ = magnetic susceptibility, M = magnetisation, H = magnetising field.

2. Magnetic Permeability

Magnetic permeability tells how easily magnetic field lines can pass through a material.

μ = B / H

μ = μ₀ μᵣ

Here, μ = permeability of material, μ₀ = permeability of free space, μᵣ = relative permeability.

3. Relation Between Susceptibility and Relative Permeability

μᵣ = 1 + χ

40 IIT & NEET Level Questions with Answers

Q1. What is magnetic susceptibility?

Ans: It is the ratio of magnetisation to magnetising field, χ = M/H.

Q2. What is magnetic permeability?

Ans: It is the ratio of magnetic flux density to magnetising field, μ = B/H.

Q3. What is the relation between μᵣ and χ?

Ans: μᵣ = 1 + χ.

Q4. For a diamagnetic substance, susceptibility is positive or negative?

Ans: Negative.

Q5. For a paramagnetic substance, susceptibility is positive or negative?

Ans: Positive but small.

Q6. For a ferromagnetic substance, susceptibility is how much?

Ans: Very large and positive.

Q7. If χ = -0.00001, what type of material is it?

Ans: Diamagnetic material.

Q8. If χ is small positive, what type of material is it?

Ans: Paramagnetic material.

Q9. If μᵣ is slightly less than 1, the material is?

Ans: Diamagnetic.

Q10. If μᵣ is slightly greater than 1, the material is?

Ans: Paramagnetic.

Q11. If μᵣ is very large, the material is?

Ans: Ferromagnetic.

Q12. Why is soft iron used in electromagnets?

Ans: Because it has high permeability and low retentivity.

Q13. Why is steel used for permanent magnets?

Ans: Because it has high retentivity and high coercivity.

Q14. What is retentivity?

Ans: The ability of a material to retain magnetism after removal of magnetising field.

Q15. What is coercivity?

Ans: The reverse magnetic field required to reduce residual magnetism to zero.

Q16. What is hysteresis?

Ans: Lagging of magnetisation behind the magnetising field.

Q17. What does the area of hysteresis loop represent?

Ans: Energy loss per unit volume per cycle.

Q18. Which material should have narrow hysteresis loop?

Ans: Transformer core material.

Q19. Why should transformer core have low hysteresis loss?

Ans: To reduce energy loss and heating.

Q20. What is Curie temperature?

Ans: Temperature above which a ferromagnetic material becomes paramagnetic.

Q21. What happens to ferromagnetism above Curie temperature?

Ans: It disappears.

Q22. Diamagnetic materials are attracted or repelled by magnetic field?

Ans: Weakly repelled.

Q23. Paramagnetic materials are attracted or repelled?

Ans: Weakly attracted.

Q24. Ferromagnetic materials are attracted how?

Ans: Strongly attracted.

Q25. Give one example of diamagnetic material.

Ans: Copper, water, bismuth or gold.

Q26. Give one example of paramagnetic material.

Ans: Aluminium, platinum or oxygen.

Q27. Give one example of ferromagnetic material.

Ans: Iron, cobalt or nickel.

Q28. What is magnetisation?

Ans: Magnetic moment per unit volume.

Q29. Unit of magnetisation is?

Ans: A/m.

Q30. Unit of magnetic field intensity H is?

Ans: A/m.

Q31. Unit of magnetic permeability is?

Ans: T m/A or H/m.

Q32. Is susceptibility dimensionless?

Ans: Yes, magnetic susceptibility is dimensionless.

Q33. What is relative permeability?

Ans: Ratio of permeability of material to permeability of free space, μᵣ = μ/μ₀.

Q34. For vacuum, χ is equal to?

Ans: Zero.

Q35. For vacuum, μᵣ is equal to?

Ans: 1.

Q36. Why diamagnetic substances have negative susceptibility?

Ans: Because induced magnetic moment is opposite to applied magnetic field.

Q37. Why paramagnetic substances have positive susceptibility?

Ans: Because magnetic dipoles partially align with applied magnetic field.

Q38. Why ferromagnetic substances show strong magnetism?

Ans: Because magnetic domains align strongly in the direction of applied field.

Q39. Which material is suitable for making permanent magnets?

Ans: Material with high retentivity and high coercivity.

Q40. Which material is suitable for making electromagnets?

Ans: Soft iron, because it magnetises and demagnetises easily.