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In a uniform magetic field of induction B a wire in the form of semicircle of radius r rotates about the diameter of the circle with angular frequency ω. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R the mean power generated per period of rotation is


( A ) Bπr2ω2R
( B ) (Bπrω)22R
( C ) (Bπr2ω)22R
( D ) (Bπrω2)28R

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