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A conducting square loop is placed in a magnetic field `B` with its plane perpendicular to the field. Now the sides of the loop start shrinking at a constant rate `alpha.` the induced emf in the loop at an instant when its side is a is

A

`2a alpha B`

B

`a^(2)alphaB`

C

`2a^(2)alpha B`

D

`a alpha B`

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The correct Answer is:
A
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