Physics Magnetism Test 1 Online MCQs

1. A steel wire of length l has a magnetic moment M. It is bent into L shape from the middle. The new magnetic moment is:

2. For between to magnetic poles depends on:

3. Two identical coils carrying same current have common center but have their planes at right angles to each other. If the field due to each coil is B, the resultant will be:

4. The magnetic moment of a short magnet is 8Am². The magnetic induction 20 cm away from its mid point on the axial line is:

5. Which of the following is not a magnetic substances ?

6. A bar magnet is released into a copper ring directly below it. The acceleration of the magnet will be:

7. The source of magnetic field is:

8. Can a system have magnetic moment even though its net charge is zero?

9. The moment of a magnet is 0.1Am² and the force acting on each pole in a uniform magnetic field of 0.36 oersted 1.44 x 10^-4 N. The distance between the poles of magnet is:

10. Two magnets have the same length and the same pole strength. But one of the magnets has a small hole at its center. Then

11. Magnetic potential at a point distant d from a magnetic pole of strength m is:

12. An non magnetic material is that which is:

13. A bar magnet is held at right angles to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it from this position. The angle of rotation is:

14. A magnet can be completely demagnetized by:

15. Potential at any point on equatorial line of dipole is:

16. A thin magnet is cut into two equal parts by cutting it parallel to its length. If the original time period of vibration is 4 sec, then time period of each part in the same field will be:

17. S.I. unit of magnetic permeability is:

18. A magnet of magnetic moment M is freely suspended in a constant uniform magnetic field of intensity H. If magnet is deflected by an angle θ from direction of H, the work done is:

19. Two small magnets, each of magnetic moment 10 Am²are placed in end of position 0.1m apart from their centers. The force acting between them is:

20. The line joining a point to the center of a short magnet makes angle θ with the axis. Potential at a point distant d from the center of magnet, on this line is: