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A rectangular coil of single turn, havin...

A rectangular coil of single turn, having area A, rotates in a uniform magnetic field B with an angular velocity `omega` about an axis perpendicular to the field. If initially the plane of coil is perpendicular to the field, then the average induced e.m.f. when it has rotated through `90^(@)` is

A

`(omega BA)/(pi)`

B

`(omega BA)/(2pi)`

C

`(omega BA)/(4pi)`

D

`(2omega BA)/(pi)`

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