The induced emf can be produced in a coil by: | vedclass

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(D) According to Faraday's law of electromagnetic induction,an induced $emf$ is produced in a coil whenever the magnetic flux linked with the coil cha

Vedclass · Accepted Answer

$C$ and $D$ only

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(D) According to Faraday's law of electromagnetic induction,an induced $emf$ is produced in a coil whenever the magnetic flux linked with the coil changes with time $(\varepsilon = -d\Phi_B / dt)$.$A.$ Moving a coil with uniform speed inside a uniform magnetic field does not change the magnetic flux $(\Phi_B = B \cdot A \cdot \cos 	heta)$,so no $emf$ is induced.$B.$ Moving a coil with non-uniform speed inside a uniform magnetic field also does not change the magnetic flux,so no $emf$ is induced.$C.$ Rotating the coil inside a uniform magnetic field changes the angle $	heta$ between the area vector and the magnetic field,thus changing the magnetic flux and inducing an $emf$.$D.$ Changing the area of the coil inside a uniform magnetic field changes the magnetic flux,thus inducing an $emf$.Therefore,both $C$ and $D$ result in an induced $emf$.

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