A ring rotates with angular velocity `omega` about an axis perpendicula to the plane of the ring passing through the center of the ring (Fig. 3.77). A constant magnetic field `B` exists parallel to the axis. Find the emf induced in the ring.

Explanation

Flux passing through the ring, `phi = BA` is constant here, emf induced in the coil is zero. Every point of this ring is at the same potential, by symmetry.