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In a simple electric generator, a conducting loop of wire is placed in a magnetic field. The loop of wire is then rotated. Why is it necessary for the wire to be rotated?

A. Its motion through the magnetic field creates a current in the wire.

B. Its motion removes the magnetic field by using up the magnetic energy.

C. Its motion when it moves upward changes gravity into magnetism.

D. Its motion through the air transforms heat into magnetism.