- noun a magnet consisting of a coil of insulated wire wrapped around a soft iron core that is magnetised only when electric current flows through the wire
- An iron-based object that becomes magnetic when a current is passed through the coils around it. The object loses its magnetism when the current is stopped.
- A magnet which becomes magnetized, or whose magnetization becomes significantly stronger, when an electric current flows through it. Such a magnet consists of a core, usually ferromagnetic, around which a coil is wound. The ferromagnetic core is frequently soft iron, while the coil is an insulated wire. The magnetic field is produced or multiplied when a current flows through the coil.