A ring rotates with angular velocity `omega` about an axis perpendicular to the plane of the ring passing through the center of the ring.A constant magnetic field `B` exists parallel to the axis.Find the `emf` induced in the ring.

Explanation

Flux passing through the ring `phi=B.A` is a constant there, therefore `emf` induced in the coil is zero.Every point of the ring is at the same potential, by symmetry.