Force on Moving Charge MCQs for CBSE Class 12
Force on Moving Charge – MCQs for CBSE Class 12
Class: 12 | Subject: Physics |
Section: Magnetic Effects of Current & Magnetism |
Topic: Force on Moving Charge
Based on: NCERT Syllabus | CBSE Board Examination Standard
Based on: NCERT Syllabus | CBSE Board Examination Standard
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. Magnetic force on a moving charge is:
Answer: B
Given by Lorentz force equation F = qvB sinθ.
Given by Lorentz force equation F = qvB sinθ.
2. Force is zero when velocity is:
Answer: A
Sin0° = 0 → no magnetic force.
Sin0° = 0 → no magnetic force.
3. Unit of magnetic field:
Answer: A
SI unit Tesla.
SI unit Tesla.
4. Direction of force found by:
Answer: A
Gives force direction on moving charge/current.
Gives force direction on moving charge/current.
5. Magnetic field does work on charge?
Answer: B
Force is perpendicular to velocity → no work.
Force is perpendicular to velocity → no work.
6. Radius of circular path:
Answer: A
From centripetal balance.
From centripetal balance.
7. Time period of revolution:
Answer: A
Independent of velocity.
Independent of velocity.
8. Path when v ⟂ B:
Answer: B
Uniform circular motion.
Uniform circular motion.
9. Path when v at angle:
Answer: B
Helical motion.
Helical motion.
10. Kinetic energy in B field:
Answer: C
No work done.
No work done.
11. Force depends on:
Answer: D
F = qvB sinθ.
F = qvB sinθ.
12. Electron vs proton force:
Answer: A
Same |q|.
Same |q|.
13. Mass affects:
Answer: B
r ∝ m.
r ∝ m.
14. Velocity selector uses:
Answer: C
Balances forces.
Balances forces.
15. No deflection when:
Answer: D
All give zero net force.
All give zero net force.
16. Magnetic force nature:
Answer: B
No potential energy defined.
No potential energy defined.
17. Magnetic force maximum when:
Answer: B
Sin90° = 1.
Sin90° = 1.
18. Moving charge produces:
Answer: C
Electromagnetic nature.
Electromagnetic nature.
19. Force direction reverses if:
Answer: D
Vector cross product changes.
Vector cross product changes.
20. SI unit of force:
Answer: B
Standard SI unit.
Standard SI unit.
