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(C) According to Faraday's law of electromagnetic induction, an electromotive force (emf) is induced in a coil whenever there is a change in the magne

Vedclass · Accepted Answer

$I, II,$ and $III$ only

Vedclass · Answer

(C) According to Faraday's law of electromagnetic induction, an electromotive force (emf) is induced in a coil whenever there is a change in the magnetic flux linked with the coil.$(I)$ Moving the magnet away from the coil changes the magnetic flux through the coil, thus inducing an emf.$(II)$ Moving the coil towards the magnet also changes the magnetic flux through the coil, thus inducing an emf.$(III)$ Rotating the coil about its vertical diameter changes the angle between the area vector of the coil and the magnetic field lines, which changes the magnetic flux $(\Phi = B A \cos 	heta)$. This change in flux induces an emf.$(IV)$ Rotating the coil about its own axis does not change the magnetic flux linked with the coil because the orientation of the coil relative to the magnetic field lines remains constant. Therefore, no emf is induced in this case.Thus, an emf is generated in situations $(I), (II),$ and $(III)$ only.

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