Horseshoe Magnet
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Horseshoe Magnet
Horseshoe magnet with computed magnetic field lines. The two magnetic poles are in close vicinity, which concentrates the field lines and creates a strong magnetic field.

A horseshoe magnet is a magnet made in the shape of a horseshoe. The magnet has two magnetic poles close together. This shape creates a strong magnetic field between the poles.

It is one type of permanent magnet, meaning that it stays magnetized, as opposed to an electromagnet, the magnetic field of which can be started and stopped.[1]

The purpose of a horseshoe magnet's shape is to place the poles as close together as possible.[2] The total magnetic flux is the same,[i] but the field is greater, as it is spread over a smaller volume. A horseshoe is used, rather than a simpler C-shaped magnet, which is also used, because this places the maximum amount of magnetised material into the magnet, for given dimensions around the poles. A particularly large horseshoe magnet is U-shaped with long parallel sides, rather than the classical horseshoe.

Electromagnets are also constructed as horseshoes. They may have either one or two coils wound on them. As most coils are wound by machine, the coil formers are straight. They are thus usually placed as two coils, one on each side of a U-shaped horseshoe.

A horseshoe magnet can be created by bending a bar magnet into a horseshoe shape.[2][3]

Notes

  1. ^ This flux depends on the amount of magnetised material.

References

  1. ^ "What is a Horseshoe Magnet? (with pictures)". wiseGEEK. Retrieved . 
  2. ^ a b Lynette, Rachel (2008). Magnets: Magnetism. Heinemann-Raintree Library. ISBN 9781432910976. 
  3. ^ Giordano, Nicholas (2012-07-27). College Physics: Reasoning and Relationships. Cengage Learning. ISBN 1285225341. 



  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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