Q7 of 36 Page 1

In the arrangement shown in figure there are two coils wound on a non- conducting cylindrical rod. Initially the key is not inserted in the circuit. Later the key is inserted and then removed shortly after.


What are the two observations that can be noted from the galvanometer reading


When the key is inserted in the circuit, the current starts to increase in the


the first coil. This produces a changing magnetic field which also passes through the other coil. This induces a current in the other coil and galvanometer shows a deflection. When the current becomes steady in the magnetic field stops changing and therefore the induction between the two coils stops. When the key is removed, the current decreases and so does the magnetic field. A current is again induced in the other coil but in the opposite direction. Therefore we can say that there are momentary galvanometer deflections that die out shortly; the deflections are in opposite directions.


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