Sponsored by electromagnet. A device that produces a magnetic field using an electric current flowing through a coil of wire, generally wound on a soft iron core.
Electromagnets are temporary magnets - when the current is turned off, the magnetism is gone.
Describes a situation in which there are opposing physical properties at different points in an object or system. A device consisting of two coils of wire wound on a soft iron core which is used to change the voltage of an alternating current. The Australian Foundation for Science and the Science and Technology Awareness Program of the Commonwealth Department of Industry, Science and Resources are also supporters of Nova . This topic is sponsored by the Commonwealth Department of Industry, Science and Resources .