How is an electromagnet different from a permanent magnet?
A. Its magnetism can be turned off
B. It is smaller and less powerful
C. It can be built without using metal
D. It does not attract objects containing iron
A. Its magnetism can be turned off
B. It is smaller and less powerful
C. It can be built without using metal
D. It does not attract objects containing iron
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Answer:
A. Its magnetism can be turned off
Explanation:
The key difference between an electromagnet and a permanent magnet is that the electromagnet can have a magnetic field when an electric current flows through it and disappears when the flow of the current stops