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MHT CET Physics question

PhysicsElectromagnetic InductionMHT CET

A very small circular loop of radius a is initially (at t = 0) coplanar and concentric with a much larger fixed circular loop of radius b. A constant current I flows in the larger loop. The smaller loop is rotated with a constant angular speed about the common diameter. The e.m.f. induced in the smaller loop as a function of time t is

Answer: (C)

Solution

Field at the centre is , so and ;

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Question ID VK-081990