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 The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

Answer: A ferromagnetic material like iron

Explanation:

A ferromagnetic material like iron, cobalt and nickel should be placed as a core in an electromagnet. These materials produce strong magnetic material when magnetic force acts. In an electromagnet, a conducting wire is wrapped around a core usually made of iron. When current flows in the wire, magnetic field is produced. The magnetic field causes the domains in the ferromagnetic materials to align in single direction and produce stronger magnetic field.

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