What device attracts materials containing iron?

A magnet is a device that creates a magnetic field, which attracts ferromagnetic materials, such as iron. This attraction occurs due to the alignment of magnetic domains within the iron, resulting in a force that pulls the iron towards the magnet. Magnets can be either permanent, retaining their magnetism over time, or temporary, where magnetism is induced only in the presence of a magnetic field.

While an electromagnet, which is created by running an electric current through a coil, also attracts iron, the primary focus of the question is on the general device that attracts iron based on its inherent magnetic properties. Magnets work regardless of electricity, making them a more fundamental example of the attraction to iron.

Inductors and transformers are components used primarily in electrical circuits for storing energy and transferring power respectively. They do not specifically attract iron in the way magnets and electromagnets do. In summary, the option highlighting a magnet best answers the question regarding which device attracts materials containing iron.