Differciate between a temporary and permanant magnet.
Asked by | 5th Oct, 2009, 11:08: PM
Permanent magnet retains its magnetic properties for a long time. Magnetic materials from which permanent magnets are made are called hard magnetic materials. Lodestone is a naturally occurring permanent magnet composed of magnetite, an iron-bearing mineral.
Temporary magnet acts as magnet only as long as it is in the magnetic field produced by a permanent magnet or an electric current. Magnetic materials from which temporary magnets are made are called soft magnetic materials. Every object that is lifted or moved by a magnet acts as a temporary magnet. . An electromagnet is a temporary magnet that is magnetized by the magnetic field produced by an electric current in a wire. Electromagnets have magnetic properties only while the current is flowing.
Answered by | 6th Oct, 2009, 12:07: AM
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