Question

Why are electromagnets useful?

Answer 1

Answer:

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Electromagnets are useful because you can turn the magnet on and off by completing or interrupting the circuit, respectively.

Answer 2

Answer:

Electromagnets are useful because you can turn the magnet on and off by completing or interrupting the circuit, respectively. ... An electromagnet is the same way, except it is "temporary" -- the magnetic field only exists when electric current is flowing

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