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.