this post was submitted on 04 Jul 2025
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The magnetic properties of certain materials (e.g. why an unmagnetized piece of iron sticks to a magnet of either polarization), the way permanent magnets work, is best explained by quantum mechanics.
However, the electromagnetic force itself doesn’t “arise” from quantum mechanics, and you can explain things like electromagnets and a lot of common electric circuits (until you need a transistor) quite well without considering quantum mechanics.
Usually you take the “classical” formula for a force and to inform your quantum mechanical model of particles, and that’s how you can arrive at things like deriving how permanent magnets work with the help of w quantum mechanics.
Generally, a lot of material science and chemistry is inherently quantum mechanical because the way atomic orbitals and molecular bonds work is heavily quantum mechanical.
Thanks for a we written reply.
Though i still dont quite get this
You seen to say if we can explain x without y then y cannot be fundamental to x.
But can electromagnetism at all emerge if the quantum mechanics dont exist to emerge things like magnetism and some of the behavior of electrons?
Well yeah, sure. Earlier you said something like "electromagentism is caused by quantum phenomena," but you can say that about almost every object and behavior in the universe! We don't have a theory of everything but the standard model and quantum field theory explain a lot.