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There are two coils A and B. A current starts flowing in B, the coil A is made to rotate about a vertical axis as shown in the fig. No current flows in B if A is at rest. The current in the coil A, when the current in B (at t = 0) is counter clockwise and the coil A is as shown at this instant t= 0 is
(a) constant current clockwise
(b) varying current clockwise
(c) varying current clockwise<br> (d) constant current counter clockwise.

1 Answer

When current in coil B (at t = 0) is counter clockwise constant current in A (at t = 0) must be clockwise. Therefore when coil A is made to rotate about a vertical axis, it would reduce induce current in clockwise direction,as per Lenz's law.
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