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A conducting circular loop is placed in a uniform magnetic field of induction B tesla with its plane normal to the field. Now, the radius of the loop starts shrinking at the rate (dr/dt). Then, the induced emf at the instant when the radius is r, is

A

`pirB(dr// dt)`

B

`2pirB(dr// dt)`

C

`pir^(2)(dB// dt)`

D

`(pir^(2)//2)B(dr// dt)`

Text Solution

Verified by Experts

The correct Answer is:
B
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