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A rectangular coil of area A rotates in ...

A rectangular coil of area A rotates in a uniform magnetic field B with angular velocity about an axis perpendicular to the field, initially the plane of coil is perpendicular to the field,then the average induced e.m.f. after rotating by `90°` is

A

`(BA omega/3π)`

B

`(BA omega/2pi)`

C

`(BA omega/pi)`

D

`(2BA omega/3pi)`

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