Why is an electromagnet a temporary magnet?
a. An electromagnet cannot be turned on and off.
b. An electromagnet is a magnet when no current flows through the wire. The electromagnet no longer acts as a magnet when current flows through the wire.
c. An electromagnet is only a magnet if a current flows through the wire continuously.
d. An electromagnet becomes a magnet when a current flows through the wire. An electromagnet no longer acts as a magnet when the current flow stops.
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