How is an electromagnet different from a bar magnet?
A) Bar magnets have a north and south pole, but electromagnets do not.
Eliminate
B) Electromagnets are strong, permanent magnets, but bar magnets are always weaker.
C) Electromagnets are only magnetized when a current flows through a wire wrapped around the core.
D) Bar magnets are attracted to ferromagnetic substances such as iron. Electromagnets are attracted to all metals.
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