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Question

A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil (ii) withdrawn from inside the coil (iii) held stationary inside the coil.

Solution
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When a coil of insulated copper wire is connected to a galvanometer, following observations will take place for each option:

(I) If a bar magnet is pushed into the coil, an electric current will be induced in coil due to electromagnetic induction.

(ii) If a bar magnet is withdrawn from inside, again current will be induced in the copper wire due to electromagnetic induction but this time the direction of current will be reverse in galvanometer.

(iii) If a bar magnet is held stationary inside the coil then no current is induced and therefore there is no deflection in the galvanometer.

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