JEE Main 2004 Physics question
In a uniform magnetic field of induction a wire in the form of semicircle of radius rotates about the diameter of the circle with angular frequency . The axis of rotation is perpendicular to the field. If the total resistance of the circuit is the mean power generated per period of rotation is
Answer: (4)
Solution
Flux through the semicircle: , so with peak . Mean power . This matches option (4) (printed with
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