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Figure shows a powerful electromagnet arrangement. A copper ring, which is free to move, is Placed on the projecting part of the core as shown. When the key is inserted, the ring

is thrown up
remains stationary
sticks to the core
slips down along the core

detailed solution

Correct option is A

Flux through the ring increases in upward direction. To oppose the same, it is thrown up. As the ring moves up, the intensity of magnetic field due to electromagnet at upper points is less since B∝1r3

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Due to change in magnetic flux linked with a coil of resistance 10 ohm, a current is induced in it. The variation of induced current i in amperes) with time t (in seconds) is shown in figure. The magnitude of change in flux through the coil (from t = 0 to t = 2 seconds) in Webers is:

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