$A$ thin semicircular conducting ring $(PQR)$ of radius $r$ is falling with its plane vertical in a horizontal magnetic field $B,$ as shown in the figure. The potential difference developed across the ring when its speed is $v,$ is
- A$0$
- B$2rBv$ and $R$ is at higher potential
- C$\pi rBv$ and $R$ is at higher potential
- D$\frac{Bv\pi r^2}{2}$ and $P$ is at higher potential
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