You are seeing Ask web results for ELECTROMAGNET.
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Instructions for building an electromagnet. ... It is fairly easy to build an electromagnet. All you need to do is wrap some insulated copper wire around an iron core. If you attach a battery to the wire, an electric current will begin to flow and the iron core will become magnetized.
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An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.
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Electromagnet - Wikipedia, the free encyclopedia
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This creates a powerful magnetic effect inside the coil called an electromagnet. The magnetic field inside the coil causes the tiny magnetic fields in the metal of the nail to be aligned in one direction (all the north poles point the same way).
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The Electromagnet ... The electromagnet developed from a series of observations. In 1820 Hans Christian Oersted (1777-1851) discovered that a current-carrying wire set up a magnetic field. ... This is an electromagnet with three poles! This one is from Queen of Philadelphia ($4.50 in the 1867 catalogue),
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