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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f.

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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is 

(a) four times per revolution 

(b) six times per revolution 

(c) once per revolution 

(d) twice per revolution

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Correct option  (d) twice per revolution

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