A thin semicircular conducting ring (PQR) of radius 'r' is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is :-

1. A. Zero
2. B. Bv r 2/2 and P is at higher potnetial
3. C. rBv and R is at higher potential
4. D. 2rBv and R is at higher potential

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