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A thin semicircular conducting ring of radius R is falling in a magnetic field B. Which is in limited area as shown in figure. At the position MNQ,the speed of ring is `v` and the potential difference developed across the ring is
A thin semicircuilar conducting ring (PQR) of radius r is falling with its  plane vertical in a horizontal magnetic field B, as shown in Fig. The potential  difference developed across the ring
Options:
(a) zero (b) `BvpiR^2/2` and M is at higher potential
(c) `piRBv` and Q is at higher potential (d) `2RBpi` and Q is at higher potential

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