CBSE Class 10 Science 2019 · Paper 31/4/1 · Question 11
A coil of insulated copper wire is connected to a galvanometer. What would happen if a strong bar magnet is
- (a)pushed into the coil ?
- (b)withdrawn from inside the coil ?
- (c)held stationary inside the coil ? Give justification for each observation.
Answer
Pushing in and withdrawing the magnet give opposite momentary deflections; a stationary magnet gives none, as the linked field does not change.
(a) The galvanometer needle shows a momentary deflection in one direction, because pushing the magnet in increases the magnetic field linked with the coil, and this change induces a current in the coil.
(b) The needle is deflected in the opposite direction, because withdrawing the magnet decreases the magnetic field linked with the coil, so a current is induced in the opposite direction.
(c) The galvanometer shows no deflection, because when the magnet is stationary the magnetic field linked with the coil does not change, so no current is induced.
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