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(B) When a coil of conducting wire is rotated in a magnetic field,the magnetic flux linked with the coil changes continuously. According to Faraday's

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An electric generator

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(B) When a coil of conducting wire is rotated in a magnetic field,the magnetic flux linked with the coil changes continuously. According to Faraday's law of electromagnetic induction,this change in magnetic flux induces an electromotive force $(EMF)$ and consequently an electric current in the coil. This principle is the basis of an electric generator,which converts mechanical energy into electrical energy. Therefore,the correct option is $B$.

If a coil made of conducting wires is rotated between the pole pieces of a permanent magnet,the motion will generate a current. This device is called:

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