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

(1) Zero

(2) $B\nu \pi {R}^{2}/2$ and *M* is at higher potential

(3) *πRBV* and *Q* is at higher potential

(4) 2*RBV* and *Q* is at higher potential