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

(1.) zero
(2.)`BcpiR^(2)//2`
(3.) `piRBV`
(4.) `2RBV`

Options

A. Zero
B. `Bvpi(r^(2))/(2)` and P is at higher potential
C. `pirBv` and R is at higher potential
D. `2rBv` and R is at higher potential

Answer

D