Question

Thin semicircular conducting ring of radius r is falling with its plane vertical and horizontal magnetic induction b at a point mnq the speed of the ring is v the potential difference developed across the ring is

Answer 1

Since the falling object is a ring the projection of length of the ring along right angle is equal to PR=2a

emf=Blv

=B2aV

and induced current in anti clock wise direction.

So,R will be with higher potential 2aBv