A conducting ring of radius R is placed in a magnetic field perpendicular to the plane of the coil at the rate of $\beta$. Then Which one is correct ?

Question

$(a)\;\text{All points on ring will not be at same potential} \\(b)\;\text{emf induced the ring is $\large\frac{\pi}{2}$$ R^2 \beta$ }\\ (c)\;\text {electric intensity at any point is zero} \\ (d)\;E= \large\frac{R\beta}{2}$