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A thin semicircular conducting ring of r...

A thin semicircular conducting ring of radius R is falling with its plane vertical in a horizontal magnetic induction B. At the position MNQ shown in the fig, the speed of the ring is V. The potential difference developed across the semicircular ring is

A

Zero

B

B `vR^(2)//2` and M is at higher potential

C

`piRBV` and Q is at higher potential

D

`2RBV` and Q is at higher potential

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