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Coil A is made to rotate about a vertical axis. Current flows in B if A is at rest. When the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant (t = 0),

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Initially current in A is in clockwise sense

Initially current in A is in anti-clockwise sense

At $t = 0$ , coil A attracts coil B

At $t = 0$ , coil A repels coil B

answer is C, A.

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Detailed Solution

As the loop A rotates, inward magnetic flux linked with it decreases. By Lenz's law, current in A is in anticlockwise direction to oppose this decrease.

Nearest currents in the two loops are parallel. So loops attract.

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