/sci/ - Science & Math

You shouldnt talk to a /sci/entist all these mofockers lying

100% Magic tbh.

Miracles

>>6970201
Father Christmas spins the little electrons

German humour - A complete unknown and scientific mystery.

>this thread again

>>6970201
He's got a point, how do magnetic forces not violate conservation of energy?

>>6970214
Top freaking kek.

>>6970201
magnetISM can be thought of as the part of the electromagnetic field that is mostly attributable to motion.

In stuff, electrons exist in bound states with protons. The motion of the electrons in these bound states is a current, which creates a magnetic field

in most stuff, there are many atoms and these fields cancel out since they are oriented in random directions

in some stuff, they are not oriented in random directions so the field doesn't cancel.

that is how magnets work, but how electromagnetism works (ie, why charge creates EM) is another question.

why the electrons are oriented in similar directions in some materials and not others is mostly due to statistical mechanics...if you heat up a magnet, fucking shit up with all its atoms, it won't be a magnet anymore

>>6970450
Chemfag here. I actually forgot how ferromagnetism works (i.e. why the electrons stay spin-aligned). Please explain

>>6970201
The spin of the electrons in some atoms can be aligned in the same direction. Every electron behaves as a monopole magnet. If you align the "spin" of many electrons, their fields "combine", and you get one large uniform magnetic field.

The thing that always got me about this song was that these guys seriously tried to rhyme "dirt" with "work."

>>6970453
it's a quantum mechanical effect called the exchange interaction, aka pauli repulsion

http://en.wikipedia.org/wiki/Exchange_interaction

To describe more complex cases, such as metals, an extended model is used:

http://en.wikipedia.org/wiki/RKKY_interaction

TL;DR depending on the distance between electrons, the electrons will align their magnetic moments to be either parallel or anti-parallel

>>6970201
Here you go, OP.
This is absolutely true, by the way.

>>6971648
niiiice, I think this may go a little over OP's head though.

>>6971654
yeah well, there's a reason this is never a part of formal curriculum in college beyond maybe using it as an example of how to apply eigenvalues in the most simple case of hydrogen, probably only to physics/chem graduate students