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(A) When the bar magnet enters the coil with a constant speed,the magnetic flux linked with the coil changes,and an $e.m.f.$ is induced,causing the ga

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(A) When the bar magnet enters the coil with a constant speed,the magnetic flux linked with the coil changes,and an $e.m.f.$ is induced,causing the galvanometer to deflect in one direction (e.g.,positive).When the magnet is completely inside the coil,the magnetic flux linked with the coil remains constant,so the rate of change of flux is zero,and the reading of the galvanometer is zero.When the bar magnet exits the coil,the magnetic flux linked with the coil changes again,and an $e.m.f.$ is induced in the opposite direction to that of the entry phase,causing the galvanometer to deflect in the opposite direction (e.g.,negative).

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