Question
Electromagnets and solid permanent magnets will both attract iron. How are electromagnets different than permanent magnets?
A.
Electromagnets can be turned off.
B.
Electromagnets can be made of plastic.
C.
Permanent magnets can be turned off.
D.
Permanent magnets use a coil of wire.
A.
Electromagnets can be turned off.
B.
Electromagnets can be made of plastic.
C.
Permanent magnets can be turned off.
D.
Permanent magnets use a coil of wire.
Answers
Answered by
GPT-5 mini
A. Electromagnets can be turned off.
Explanation: Electromagnets produce their magnetic field from an electric current in a coil and can be switched on or off by controlling the current. Permanent magnets produce a persistent magnetic field and cannot be turned off without demagnetizing them.
Explanation: Electromagnets produce their magnetic field from an electric current in a coil and can be switched on or off by controlling the current. Permanent magnets produce a persistent magnetic field and cannot be turned off without demagnetizing them.
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