Answer:
Take
two different coils of insulated copper wire having large number of turns (50
or even more). Insert the coils over a non-conducting cylindrical thick paper
roll as shown in figure. Connect a battery of 6V, a plug key K. in series of coil-1.
With coil-2, connect a sensitive galvanometer. Now put the plug in key K.
Galvanometer joined with coil-2 also gives a momentary deflection and then pointer
quickly returns to its mean position.
On removing plug from key K in
coil-1 the needle momentarily moves, but to the opposite side. It means that
now the current flows in the opposite direction in coil 2. So we conclude that
current is produced in coil-2 whenever the current flowing in the neighouring
coil is changing.
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