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Q & A: magnetism and fermions

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Most recent answer: 12/28/2016
Q:
Opposing poles in a magnet attract each other. Is this anything to do with Quantum Mechanics because fermions can only be in an orbital with another fermion that has an opposing spin.
- Zahra (age 18)
United States of America
A:

No, not directly. The interaction comes from the magnetic field. Even magnets made of currents running around loops show attraction of opposite poles. Quantum mechanics is involved at a different level, in causing the electron spins in some materials to line up with each other, making the magnetic field that you notice.

Mike W.


(published on 12/28/2016)

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