A magnet consisting of a solenoid with an iron core, which has a magnetic field existing --unlike a permanent magnet--only during the time of current flow through the solenoid NOTE 2: The demagnetization curve is usually plotted to the left of the vertical axis (negative values of Hd) and the energy product curve to the right
A mass, usually of soft iron, but sometimes of some other magnetic metal, as nickel or cobalt, rendered temporarily magnetic by being placed within a coil of wire through which a current of electricity is passing
A magnet produced by placing a coil of wire around a steel or iron bar When current flows through the coil the bar becomes magnetized and will remain so as long as the current continues to flow
An electromagnet is a magnet that consists of a piece of iron or steel surrounded by a coil. The metal becomes magnetic when an electric current is passed through the coil. a piece of metal that becomes magnetic (=able to attract metal objects) when an electric current is turned on. Device consisting of a core of magnetic material such as iron, surrounded by a coil through which an electric current is passed to magnetize the core. When the current is stopped, the core is no longer magnetized. Electromagnets are particularly useful wherever controllable magnets are required, as in devices in which the magnetic field is to be varied, reversed, or switched on and off. Suitably designed magnets can lift many times their own weight and are used in steelworks and scrap yards to lift loads of metal. Other devices that utilize electromagnets include particle accelerators, telephone receivers, loudspeakers, and televisions