Spin Polarized Current: Magnetic Moment & Interaction

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SUMMARY

The discussion centers on the magnetic moment of electric current and the behavior of superconductors. It clarifies that normal current exhibits a magnetic moment due to the net effect of electron spins, despite equal numbers of spin-up and spin-down electrons. A wire with electrons all polarized up would indeed attract a wire with electrons all polarized down. Additionally, it is established that superconductors exhibit no magnetic field internally due to the Meissner effect, which expels magnetic fields from the superconductor when it transitions to the superconducting state.

PREREQUISITES
  • Understanding of electron spin and magnetic moment
  • Familiarity with superconductivity and the Meissner effect
  • Knowledge of electromagnetic theory and magnetic fields
  • Basic principles of electric current and charge movement
NEXT STEPS
  • Research the Meissner effect in superconductors
  • Explore the relationship between electron spin and magnetic fields
  • Learn about the properties of spin-polarized currents
  • Investigate the implications of magnetic moment in various materials
USEFUL FOR

Physicists, electrical engineers, and students studying electromagnetism and superconductivity will benefit from this discussion.

lufc88
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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?
 
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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.
 
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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