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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 avarage induced e.m.f. after rotating by `90°` is

A

A. `(BA omega/3π)`

B

B. `(BA omega/2pi)`

C

C. `(BA omega/pi)`

D

D. `(2BA omega/pi)`

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