Which statement about an electromagnet is true?
1) it doesn’t function without a source of current.
2) the core is made from a nonmagnetic material.
3) it uses moving magnets to create an electric field.
4) it creates a permanent and strong magnetic field.

The correct answer is 1.

An electromagnet is type of magnet in which a magnetic field is produced by an electric current.

However, the magnetic field disappears when the current is turned off. Therefore, it does not function without a source of current.

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