how is a magnet made?

Asked by thamby | 2nd Aug, 2010, 12:00: AM

Expert Answer:

Magnets can be made by exposing a piece of metal to a magnetic field. This can be done by running a magnet along the length of the metal. The molecules inside the metal rearrange themselves so that they line up in a north-south pattern. Once this happens, the metal is polarized and magnetized as a permanent magnet. It willl not lose its magnetic field over time.
 
Electromagnets only have a charge when electric charge is passed through a metal wire. Electrifying a wire formed into coils or loops will create a magnetic field within the loops. This can be seen in the image of the Faraday electromagnet. Increasing the electric charge or inserting a piece of iron, cobalt or nickel through the loops of wire will make the electromagnet stronger, but these only work as long as the current is on.
 
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Answered by  | 4th Aug, 2010, 01:03: PM

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