Answer:
Let
two different coils of copper wire, namely coil 1 and coil 2, having large
number of turns are arranged as per the circuit diagram (as shown in figure).
The coil 1, having larger number of turns, is connected in series with a
battery and a plug key whereas the other coil 2 is connected with a
galvanometer.
Case I When key K is closed, the galvanometer
shows a deflection in its needle instantly jumps to one
side and just as quickly returns to zero, indicating a momentary current in coil
2. This happens due to an external magnetic field passing through the loop increases.
Case II When key K is open, the coil 1 is disconnected
from the battery. The needle momentarily moves, but to the opposite side.
It means that now the current flows in the opposite
direction in coil 2. This happens due to an external magnetic field passing through
the loop decreases. (2)
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