With the aid of a diagram describe an experiment to illustrate Lenz’s law of electromagnetic induction.

With the aid of a diagram describe an experiment to illustrate Lenz’s law of electromagnetic induction.

• The galvanometer is first connected in series with the battery and the coil PQ. The switch K is closed. The direction of deflection of the galvanometer for which current flows in an anticlockwise direction at the end P of the coil is noted.
• The battery is then disconnected and the circuit containing the coil and the switch is made complete.
• A strong permanent magnet is brought towards the coil with a North Pole facing end P of the coil.
• The galvanometer deflects in a direction for which the site of the coil facing the magnet is North Pole.
• When the magnet is moved away from the coil, the galvanometer deflects in the opposite direction implying that the pole of the coil near the magnet is a south pole.
• In the first case, the pole due to the increased current was repelling the approaching magnet while in the second case, the pole was attracting the receding magnet. The induced current therefore is in such a direction as to oppose the change causing it, which is Lenz’s law

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