Question

How is an electromagnet different from a permanent magnet, such as a horseshoe magnet?
A.
The north and south poles of an electromagnet can be reversed.
B.
An electromagnet can be turned off and on.
C.
An electromagnet is a magnet made using an electric current.
D.
all of these

Answer 1

D. all of these

All three statements are true: an electromagnet is produced by electric current, its poles reverse when the current direction is reversed, and it can be turned on or off by switching the current.