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

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half revolution

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(B) When a rectangular coil of copper 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 flux induces an electromotive force $(EMF)$ and consequently an induced current in the coil.As the coil rotates,the side of the coil that was moving upwards starts moving downwards after completing a half revolution.Due to this change in the direction of motion relative to the magnetic field lines,the direction of the induced current reverses after every half revolution.Therefore,the direction of the induced current changes once in each half revolution.

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$A$ rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

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Choose the correct option.$A$ rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each