When a magnet is pushed in and out of a circu | vedclass

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(C) According to Faraday's law of electromagnetic induction,the induced electromotive force $(EMF)$ is proportional to the rate of change of magnetic

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Oscillations in the deflection will be observed clearly if $
u = 1$ or $2 \, Hz$.

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(C) According to Faraday's law of electromagnetic induction,the induced electromotive force $(EMF)$ is proportional to the rate of change of magnetic flux through the coil. When the magnet is moved in and out with a frequency $
u$,the magnetic flux changes periodically,inducing an alternating current in the coil. The galvanometer needle has a certain moment of inertia and damping,which limits its ability to respond to high-frequency changes. If the frequency $
u$ is low (e.g.,$1 \, Hz$ or $2 \, Hz$),the galvanometer needle can follow the changes in the induced current,and oscillations in the deflection will be observed clearly. If the frequency $
u$ is high (e.g.,$50 \, Hz$),the needle cannot keep up with the rapid oscillations due to its inertia and will remain at the zero position (or show a very small,steady deflection),making the oscillations invisible.

When a magnet is pushed in and out of a circular coil $C$ connected to a very sensitive galvanometer $G$ as shown in the adjoining diagram with a frequency $\nu$,then

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