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When the magnet is released, current is induced in the coil and the galvanometer deflects away from the zero mark and then deflects back to zero as the magnet falls far away from the coil and the magnetic field is taken off.
When the magnet is released, a changing magnetic field is produced around the coil and the direction of this induced magnetic field is such that it opposes the change in magnetic flux caused by the moving magnet.
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