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The endpoints of a conducting string (sh...

The endpoints of a conducting string (shaped as a circular loop) of constant length are being pulled at a constant velocity v as shown in the figure. There exists a uniform magnetic field B is space which is perpendicular to the circular loop. If the loop always remains circular during the motion of its endpoints, them the emf induced in the loop at `t=(piR)/(2v)` is

A

2BRv

B

BRv

C

4BRv

D

0.5 BRv

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The correct Answer is:
B
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