electromagnet A magnet constructed from a soft iron core around which is wound a coil of insulated wire. A magnetic field is set up when an electric current is passed through the wire; it is reinforced and concentrated by the core becaused of its high permeability. The field disappears when the current is switched off. Related category • ELECTRICITY AND MAGNETISM Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |