Physics
A coil of insulated copper wire is connected to a galvanometer. What will happen, if a bar magnet is
- pushed in to the coil,
- withdrawn from inside the coil and
- held stationary inside the coil?
Name the phenomenon involved.
Electro-Magnetism
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Answer
- When a bar magnet is pushed in to the coil, the magnetic field around the coil will change. Hence, some current will be induced in the coil and the galvanometer will show deflection.
- When the bar magnet is withdrawn from the coil, the current is induced in opposite direction and so the deflection in the galvanometer will be in opposite direction.
- When a bar magnet is held stationary inside the coil, no current is induced and there will be no deflection in the galvanometer.
The phenomenon involved is Electromagnetic induction.
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