====== magnets ======

^ Projects infobox ^^
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| tools | [[:wrenches|Wrenches]] |
| parts | [[:motors|Motors]], [[:category:controllers|Controllers]] |
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[[:category:parts|Category:Parts]]

[[:category:electric_parts|Category:Electric parts]]

==== Introduction ====

A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets.

A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel and cobalt and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.

==== Challenges ====

==== Approaches ====

==== References ====

  * [[https://en.wikipedia.org/wiki/Magnet|Wikipedia: Magnet]]

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[[https://github.com/timschmidt/replimat/blob/e0bc0b855bb946bab00c75ca0d8b002ae0dc0172/wiki/magnets.html|Original archived page]] — revision 7982, 2021-09-23T08:56:33+00:00, by Tim.