A magnet $N S$ is suspended from a spring and when it oscillates, the magnet moves in and out of the coil $C$ . The coil is connected to a galvanometer $G$ . Then, as the magnet oscillates :

G

shows no deflection

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G

shows deflection to the left and right but amplitude steadily decreases.

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G

shows deflection to the left and right with constant amplitude.

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G

shows deflection on one side.

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Solution

The correct option is B $G$ shows deflection to the left and right but amplitude steadily decreases.
Since the magnet will perform SHM, its velocity will both increase and decrease as it moves towards and away from the mean position and hence the galvanometer will show deflection on both the sides. Since the amplitude of the magnet (and hence maximum velocity) will decrease due to eddy current losses, the amplitude of deflection will also decrease with time.

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A magnet NS is suspended from a spring and when it oscillates, the magnet moves in and out of the coil C. The coil is connected to a galvanometer G. Then, as the magnet oscillates :

A magnet $N S$ is suspended from a spring and when it oscillates, the magnet moves in and out of the coil $C$ . The coil is connected to a galvanometer $G$ . Then, as the magnet oscillates :