Ncert Exercises & Solutions

Same as problem 4 except the coil A is made to rotate about a vertical axis as shown in the figure. No current 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

1. constant current clockwise
2. varying current clockwise
3. varying current counterclockwise
4. constant current counterclockwise

(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 the north pole of the 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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