Question
In the figure given below, a bar magnet moving towards the right or left induces an e.m.f. in the coils (1) and (2). Find, giving reason, the directions of the induced currents through the resistors AB and CD when the magnet is moving (a) towards the left, and (b) towards the right.
Solution
(a) When bar magnet is moved towards left, the anticlockwise current will be in loop (1) and (2) {facing bar magnet} following Lenz’s law. Thus, the direction of induced current in loop (1) will be from A to B and that in (2) will be from D to C.
(b) When bar magnet is moved towards right, the clockwise current will be in loop (1) and (2) {facing bar magnet} following Lenz’s law. Thus, the direction of induced current in the loop (1) will be from B to A and C to D.
