Physics Tutor in Lokhandwala Mumbai - Kumar Physics Classes

Physics Tutor in Lokhandwala Mumbai – Why Physics Matters Even for Film Families

+91-9958461445

If you are walking around Lokhandwala Mumbai and searching for a good Physics tutor, you already know that this area has a very fast, stylish and ambitious lifestyle. Many families here are connected with films, television, media, production houses, editing studios, acting, direction, business and creative fields. Some parents are actors, directors, producers, editors, designers or entrepreneurs. Life looks glamorous from outside, but when it comes to children’s education, one problem remains very common: Physics concepts are not clear.

Many students think Physics is only for engineers or doctors, but that is not true. Physics develops aptitude, imagination, observation power, logical thinking and problem-solving ability. Even if a student wants to enter films, animation, cinematography, editing, sound engineering, VFX, gaming, robotics, aviation, architecture or design, Physics helps a lot. Camera angles, light, reflection, lenses, sound, electricity, motion, force, energy, waves, optics and electronics are all connected with Physics. A child who understands Physics can think better, ask better questions and understand technology more deeply.

In Lokhandwala Mumbai, many students have access to good schools, good devices, online videos and expensive coaching material, but still they struggle in Physics. The reason is simple: Physics cannot be learned by only watching videos or memorising formulas. Physics needs personal explanation, doubt solving and step-by-step concept building. If a student is preparing for NEET Physics, IIT JEE Physics, CBSE Physics, IB Physics, IGCSE Physics, A-Level Physics or AP Physics, then weak basics can create serious problems later.

For example, many students know the formula of resistance, current and voltage, but they do not understand the real concept. When resistors are connected in series, the same current flows through each resistor because there is only one path for charge flow. The potential difference gets divided across different resistors. But when resistors are connected in parallel, the potential difference across each branch remains the same because all branches are connected across the same two points. Current divides according to resistance. This small concept becomes very important in electricity, circuits, Kirchhoff’s laws and numerical problems.

Kumar Sir explains Physics from the root level. He does not only tell the formula; he explains why the formula is used, where it comes from and how to apply it in exam questions. Whether the student is from a film family, business family or academic family, the requirement is the same: clear concepts, regular practice and personal attention.

If your child lives in Lokhandwala Mumbai and is weak in Physics, then one demo interaction with Kumar Sir can help you understand the real problem. Sometimes the student is not weak; the method of teaching is weak. Once the concept becomes clear, Physics becomes logical, interesting and scoring.

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

Resistance Formula: R = ρL / A

50 Conceptual Questions With Solutions | Mumbai Style Physics Learning

R = ρL / A

R = Resistance, ρ = Resistivity, L = Length, A = Area of cross-section

Resistance increases with length and resistivity, but decreases when area increases.

1. What is the formula of resistance of a wire?

R = ρL/A, where ρ is resistivity, L is length and A is area.

2. If length doubles, what happens to resistance?

Resistance doubles because R ∝ L.

3. If area doubles, what happens to resistance?

Resistance becomes half because R ∝ 1/A.

4. Why does a long wire have more resistance?

Electrons face more collisions in a longer path, so resistance increases.

5. Why does a thick wire have less resistance?

A thick wire has larger area, giving more path to electrons, so resistance decreases.

6. What is resistivity?

Resistivity is the property of material which tells how strongly it opposes current.

7. Does resistance depend on material?

Yes, because different materials have different resistivity ρ.

8. Which has more resistance: copper or nichrome?

Nichrome has more resistance because its resistivity is higher.

9. Why is copper used in wires?

Copper has low resistivity, so it offers low resistance to current.

10. Why is nichrome used in heaters?

Nichrome has high resistance and produces heat effectively.

11. If length becomes 3L, resistance becomes?

R becomes 3R because resistance is directly proportional to length.

12. If radius doubles, what happens to resistance?

Area becomes 4 times, so resistance becomes R/4.

13. Why does radius affect resistance strongly?

Because area A = πr², so small change in radius changes area greatly.

14. If diameter doubles, resistance becomes?

Area becomes 4 times, so resistance becomes one-fourth.

15. What is the SI unit of resistance?

Ohm, written as Ω.

16. What is the SI unit of resistivity?

Ohm metre, written as Ω m.

17. Is resistivity same for all wires?

No, it depends on the material and temperature.

18. Does resistance depend on temperature?

Yes, for metals resistance generally increases with temperature.

19. Why does resistance of metal increase on heating?

Atoms vibrate more and electrons suffer more collisions.

20. What happens to resistance if wire is stretched?

Length increases and area decreases, so resistance increases.

21. If a wire is cut into two equal parts, resistance of each part?

Each part has half length, so resistance becomes R/2.

22. If two equal halves are connected in parallel, equivalent resistance?

Each is R/2; parallel equivalent = R/4.

23. If two equal halves are connected in series?

Total resistance becomes R again.

24. Why is resistance scalar?

It has magnitude only and no direction.

25. What is conductance?

Conductance is reciprocal of resistance: G = 1/R.

26. What is conductivity?

Conductivity is reciprocal of resistivity: σ = 1/ρ.

27. If resistivity increases, resistance?

Resistance increases because R ∝ ρ.

28. If area is very small, resistance?

Resistance becomes large.

29. Why fuse wire is thin?

Thin wire has high resistance and melts quickly when current is high.

30. Why transmission wires are thick?

Thick wires have low resistance, so power loss is reduced.

31. What is power loss in a wire?

Power loss is I²R. More resistance means more heat loss.

32. Why high voltage transmission is used?

For same power, high voltage gives low current, reducing I²R loss.

33. Can resistance be zero?

In ordinary conductors no, but superconductors can have nearly zero resistance.

34. Why insulators have high resistance?

They have very high resistivity and very few free electrons.

35. Why silver is a good conductor?

Silver has very low resistivity.

36. Why aluminium is used in transmission lines?

It is light, cheaper than copper, and has good conductivity.

37. If L is constant and A increases, resistance?

Resistance decreases.

38. If A is constant and L decreases, resistance?

Resistance decreases.

39. Why resistance is not only material property?

Because resistance also depends on length and area.

40. Why resistivity is material property?

Because for a given temperature it depends only on nature of material.

41. A wire has R = 10Ω. If length becomes double, find R.

New R = 20Ω.

42. A wire has R = 12Ω. If area becomes double, find R.

New R = 6Ω.

43. A wire has R = 8Ω. If radius becomes double, find R.

New R = 8/4 = 2Ω.

44. A wire has R = 5Ω. If length becomes 4 times, find R.

New R = 20Ω.

45. A wire has R = 16Ω. If diameter becomes double, find R.

New R = 4Ω.

46. Why do household wires get heated?

Due to resistance, electrical energy converts into heat.

47. Why should connecting wires have low resistance?

To reduce voltage drop and heating loss.

48. What happens if a wire is made very thin?

Resistance increases and heating becomes more.

49. What is the main concept behind R = ρL/A?

Resistance depends on material, length and thickness of conductor.

50. How does Kumar Sir explain this formula?

Kumar Sir explains it from root level: long road means more obstruction, wide road means easy flow, and material decides how difficult the flow is.