Moving Charges and Magnetism Class 12 MCQs Questions with Answers

1. A strong magnetic field is applied on a stationary electron. Then the electron

2. A current carrying power line carries current from west to east. Then the direction of the magnetic field 2 m above it is :

3. A cubical region of space is filled with some uniform electric and magnetic fields. An electron enters the cube across one of its faces with velocity v and a positron enters via opposite face with velocity -v. At this instant,

4. The conversion of a moving coil galvanometer into a voltmeter is done by

5. Earth’s magnetism was discovered by:

6. Consider a wire carrying a steady current, l placed in a uniform magnetic field B perpendicular to its length. Consider the charges inside the wire. It is known that magnetic forces do no work. This implies that

7. An electron is projected along the axis of a circular conductor carrying the same current. Electron will experience

8. If a charged particle moves through a magnetic field perpendicular to it

9. The sensitivity of a tangent galvanometer can be increased by increasing:

10. Isoclinic lines are the lines joining places with :

11. Circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is :

12.  
A charged particle will not move with a constant velocity in a region where in,

13. Which one of the following is correct statement about magnetic forces?

14. Two a-particles have the ratio of their velocities as 3 : 2 on entering the field. If they move in different circular paths, then the ratio of the radii of their paths is

15. A current loop placed in a non-uniform magnetic field experiences

16. The radius of the trajectory of a charged particle in a uniform magnetic field is proportional to the:

17. The nature of parallel and anti-parallel currents are

18. A wire of length 2 metre carries a current 1 ampere, is bent to form a circle. The magnetic moment of the coil is :

19. Which of the following is not correct about cyclotron?

20. The conversion of a moving coil galvanometer into a voltmeter is done by