Question

A uniform magnetic field of induction B is confined to a cylindrical region of radius R . The magnetic field is increasing at a constant rate of \(\frac{d B}{d t}\) T s ^{− 1 .} An electron placed at the point P on the periphery of the field, experiences an acceleration :

Answer 1

The correct option is (1) \(\frac{1}{2}\)\(\frac{eR}{m} \frac{dB}{dt}\) toward left.

At P induced electric field, 

When your right thumb points in the direction opposite to the change in B your curl fingers in the direction of the induced electric field.