Answer:

Produced by a current conductor

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil.

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coiling wire around an iron nail

Explanation:

A coil with an iron core is called an electromagnet. The iron core increases the coil's magnetic field strength. A simple electromagnet is made by coiling wire around an iron nail.