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A ring is rotated about diametric axis in a uniform magnetic field perpendicular to the plane of the ring. If initially the plane of the ring is perpendicular to the magnetic field. Find the instant of time at which EMF will be maximum & minimum respectively. (Figure:)

A

5 sec and 7.5 sec

B

2.5 sec and 5 sec

C

2.5 sec and 7.5 sec

D

10 sec and 5 sec

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