Spin polarized current

  • Thread starter lufc88
  • Start date
  • #1
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Main Question or Discussion Point

How come normal current has a magnetic moment if 50% of electrons have spin up and 50% have spin down. Is it because they have to be in pairs?
Would a wire of current with electrons all polarized up attract a wire next to it with electrons all polarized down?

Extra question
How come superconductors have no B field by the way?
 

Answers and Replies

  • #2
172
2
The magnetic field caused by a current isn't a consequence of electron spin. Any electrically charged particle that is moving will produce a magnetic field.
 
  • #3
52
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Sorry ignore the first question so again why does a superconductor have no magnetic field inside of it if electrically charged particles are moving.
 

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