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A square loop of side .a. lying in a per...

A square loop of side .a. lying in a perpendicular magnetic field to its plane is changed to a circle. If change occurs in .t. seconds in magnetic field B tesla, the induced emf is

A

`(4)/(pi)(Ba^(2))/(t)`

B

`(Ba^(2))/(t)`

C

`(Ba^(2))/(t)[(4)/(pi)-1]`

D

zero

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