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A thin semicircular ring of radius 'a' is falling with its plane vertical to a horizontal magnetic field induction B .At the given position PQR the speed of ring is 'v' , the potential difference developed across the ring.

(a)zero(b)P will be with higher potential 2aBv(c)R will be with higher potential 2aBv(d)R will be with higher potential πBv

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