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A thin semicircular conducting ring (PQR...

A thin semicircular 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 when its speed is `upsilon`, is

A

2rBv and R is at higher potential

B

zero

C

`Bvpir^2//2` and P is at higher potential

D

`pirBv` and R is at higher potential

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The correct Answer is:
A
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