Which is an important step in how an electric motor uses magnetic force to produce motion?
a) as the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then attract.
b) as the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
c) as the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
d) as the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then attract.