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Spin polarized current

  1. Sep 10, 2012 #1
    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?
     
  2. jcsd
  3. Sep 10, 2012 #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.
     
  4. Sep 10, 2012 #3
    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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