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Question

# Consider the situation shown in figure. If the switch is closed and after some time it is opened again, the closed loop will show (a) an anticlockwise current-pulse (b) a clockwise current-pulse (c) an anticlockwise current-pulse and then a clockwise current-pulse (d) a clockwise current-pulse and then an anticlockwise current-pulse

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Solution

## (d) a clockwise current-pulse and then an anticlockwise current-pulse When the switch is closed, the current will flow in downward direction in part AB of the circuit nearest to the closed loop. Due to current in wire AB, a magnetic field will be produced in the loop. This magnetic field due to increasing current will be the cause of the induced current in the closed loop. According to Lenz's law, the induced current is such that it opposes the increase in the magnetic field that induces it. So, the induced current will be in clockwise direction opposing the increase in the magnetic field in upward direction. Similarly, when the circuit is opened, the current will suddenly fall in the circuit, leading to decrease in the magnetic field in the loop. Again, according to Lenz's law, the induced current is such that it opposes the decrease in the magnetic field. So, the induced current will be in anti-clockwise direction, opposing the decrease in the magnetic field in upward direction.

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