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A magnet is suspended lengthwise from a spring and while it oscillates, the magnet moves in and out of the coil C connected to a galvanometer G. Then, as the magnet oscillates
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deflection of to the left and right has decreasing amplitude
As a given pole ( or ) of suspended magnet goes into the coil and comes out of it, current is induced in the coil in two opposite directions. Therefore, galvanometer deflection goes to left and right both. As the amplitude of oscillation of magnet goes on decreasing, so does the amplitude of deflection.
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