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Same as problem 4 except the coil A is m...

Same as problem `4` except the coil `A` is made to rotate about a vertical axis in the plane of the coil (Figure). No currents flows in `B` if `A` is at rest. The current in coil `A`, when the current in `B` (at `t = 0`) is counterclockwise and the coil `A` is as shown at this instant, `t = 0`, is

A

Constant current clockwise

B

Varying current clockwise

C

Varying current counter clockwise

D

Constant current counter clockwise

Text Solution

Verified by Experts

The correct Answer is:
A
When the current in B `(at t=0)` is counter-clockwise and the coil A is considered above to it. The counterclockwise flow of the current 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 by Lenz's rule.
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