Two coils 1 and 2 of insulated copper wire having large but different number of turns are wound over a cardboard cylinder. Coil 1 is connected to battery and a plug key. Coil 2 is connected to a galvanometer.
How will the galvanometer reading change when
(i) key is plugged in and
(ii) key is taken out? Give reason for your answer in each case
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(1) When the key is plugged in, for that instant the galvanometer shows deflection
(2)When the key is taken out for that instant, the galvanometer still shows deflection but in the opposite direction
Reason:
- Whenever we plug-in or plug-out the key there is an instantaneous flow of the current in the coil 1.
- Due to the flow of the current, the magnetic field associated with coil 2 changes. This changing magnetic field of coil 2 induces a current in it.
- As the current flows in the coil, the galvanometer shows deflection.
- This phenomenon is known as electromagnetic induction.
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