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00906_Field_906.txt
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1997-05-26
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809b
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36 lines
Background Information
Magnets produce a magnetic force. The area
around a magnet where the
force works is called a
magnetic field. When a
magnet is moved near a
closed coil of wire, the
magnetic field creates, or
induces, an electrical
current in the wire.
The amount of electrical
current produced in the wire is affected by the strength of the magnet, the numbers of coils in the wire, and the speed at which the magnet moves past the wire. Stronger magnets, faster speeds, and more coils all create bigger currents.
Moving a magnet back and
forth past a wire changes
the direction of the flow of
electricity in the wire. This
type of current is called
alternating current because
the direction of the current
flow alternates back and
forth.