Describe an experiment to demonstrate the phenomenon of electromagnetic induction
The process by which a changing magnetic field in a conductor induces a current in another conductor is called electromagnetic induction.
Take two different coils of insulated copper wire having large number of turns (50 or even more). Insert the two coils over a non-conducting cylindrical thick paper roll as shown.
Connect a battery (of 6 V) and a plug key K in series of coil-1. With coil-2 connect a sensitive galvanometer joined with coil-2 also gives a momentary deflection and then the pointer quickly returns to its mean position.
Now remove the plug from key K. The galvanometer in coil - 2 again gives a momentary deflection but in the reverse direction.
Moreover, we observe that as soon as current in coil - 1 becomes either steady or zero, there is no deflection in galvanometer.
From the above experiment, we conclude that an induced curret is produced in coil - 2 on account of electromagnetic induction whenever current in coil - 1 is changing.
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