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Three identical rings move with same speed on a horizontal surface with their planes vertical , in a uniform horizontal magnetic field normal to plane of rings. The first slips without rolling, the second rolls without slipping and the third rolls with slipping. Then

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Same e.m.f. is induced in all three rings

No e.m.f. is induced in any of the rings

In each ring, all points are at same potential

B develops maximum induced e.m.f. and A, the least

answer is B.

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Detailed Solution

Since the magnetic field is uniform , during the motion of the ring magnetic flux linked with the ring is not changing . Hence emf induced in each ring is zero .

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