The diagram below shows two coils A and B pla | vedclass

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(C) When an alternating current (ac) flows through coil $A$,it produces a time-varying magnetic field. This changing magnetic field induces an alterna

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Oscillations in the galvanometer may be observed when the input ac voltage has a frequency of $1$ to $2 \, Hz$.

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(C) When an alternating current (ac) flows through coil $A$,it produces a time-varying magnetic field. This changing magnetic field induces an alternating electromotive force (emf) in coil $B$ due to electromagnetic induction. Consequently,an alternating current flows through the galvanometer $G$. At a standard frequency of $50 \, Hz$,the galvanometer needle cannot follow the rapid changes due to its inertia,and it will show no visible deflection or just a slight vibration. However,if the frequency of the input ac voltage is very low,such as $1$ to $2 \, Hz$,the galvanometer needle will have enough time to respond to the changing current,and visible oscillations of the needle will be observed.

The diagram below shows two coils $A$ and $B$ placed parallel to each other at a very small distance. Coil $A$ is connected to an ac supply. $G$ is a very sensitive galvanometer. When the key $K$ is closed:

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