Consider a circular wire of radius r moving towards a region of constant and uniform magnetic field b perpendicular to the plane of the circular wire.

Consider a circular wire of radius R moving towards a region of constant and uniform magnetic field B perpendicular to the plane of the circular wire. It is pushed into the region of the magnetic field with a constant speed at t = 0. The induced emf at time t when the edge of the field region subtends an angle 0 at the centre is (a) 2BRv sine (b) 2BRV sin 2 (c) BRV sine (d) 2Brv cos