How does an electric motor use magnetic force to produce motion?
A. The north pole of a permanent magnet placed in the center of an electromagnet attracts the north pole of the electromagnet.
B. The north pole of an electromagnet placed in the center of a permanent magnet attracts the north pole of the permanent magnet.
C. The north pole of a permanent magnet placed in the center of an electromagnet repels the north pole of the electromagnet.
D. The north pole of an electromagnet placed in the center of a permanent magnet repels the north pole of the permanent magnet.
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