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A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is name to shrink at a constant rate of `1 mm s^-1` The induced emf when the radius is 2 cm is

A

`2 pi mu V`

B

`pi mu V`

C

`pi/2 muV`

D

`2 mu V`

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