11. Lenz's law is a consequence of the law of conservation of
12. A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is
13. The laws of electromagnetic induction have been used in the construction of a
14. Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon
15. Two identical coaxial circular loops carry a current i each circulating in the same direction. If the loops approach each other, you will observe that the current in
16. When current in a coil changes from 5 A to 2 A in 0.1 s, average voltage of 50 V is produced. The self-inductance of the coil is
17. The self inductance associated with a coil is independent of
18. A coil having 500 sq. loops of side 10 cm is placed normal to magnetic flux which increases at a rate of 1 T/s. The induced emf is
19. A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10-5 weber. The inductance is
20. The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was
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