Answer :

First of all understand the Lenz’s law According to this law, the direction of induced e.m.f. or current in a circuit is such that it opposes the cause of flux change accordance with the law of conservation of energy. (negative shows oppose the cause).

At t=0 as mention in question current in B is clockwise and considered coil A above coil B. The current flowing in counterclockwise in B is equivalent to north-pole of magnet and magnetic field lines are emanating upward to coil A. When coil A start rotating at t=0, the current in A is constant along clockwise direction accordance with Lenz’s law.

So all options are wrong except (a).

Therefore, option (a) is correct answer.

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