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<blockquote data-quote="freyar" data-source="post: 6865703" data-attributes="member: 40227"><p>Photons --- particles of light --- are what carry the electromagnetic force. So, like electric fields, we can say magnetic fields are composed of many photons (that's a really loose way of putting things). Now, if you're asking why certain materials are magnetic, it mostly does have to do with the electrons, namely their spins and/or orbits, which cause each atom or ion to act like a miniature magnet. Certain materials, like iron, have magnetic properties because there are small interactions between the atoms/ions that make those miniature magnets preferably align, so they add up into a big magnet. There are also materials where the miniature magnets like to anti-align, and those materials tend to suppress, rather than create, magnetic fields.</p></blockquote><p></p>
[QUOTE="freyar, post: 6865703, member: 40227"] Photons --- particles of light --- are what carry the electromagnetic force. So, like electric fields, we can say magnetic fields are composed of many photons (that's a really loose way of putting things). Now, if you're asking why certain materials are magnetic, it mostly does have to do with the electrons, namely their spins and/or orbits, which cause each atom or ion to act like a miniature magnet. Certain materials, like iron, have magnetic properties because there are small interactions between the atoms/ions that make those miniature magnets preferably align, so they add up into a big magnet. There are also materials where the miniature magnets like to anti-align, and those materials tend to suppress, rather than create, magnetic fields. [/QUOTE]
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