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Q.

A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at t=0 and completely emerges out at t = T sec . The  current in the ring varies as

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a

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b

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c

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d

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answer is B.

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Detailed Solution

When ring enters, there is an emf induced due to flux change. Once ring is inside, there is no flux change. When it emerges out, emf induced with opposite polarity

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