spin polarized current

lufc88

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?

Nessdude14

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.

lufc88

Sorry ignore the first question so again why does a superconductor have no magnetic field inside of it if electrically charged particles are moving.

Similar Threads for: spin polarized current
Thread	Forum	Replies
Polarized Light and Quantum Spin	Astrophysics	4
spin and current	Quantum Physics	1
question on current flow through polarized capacitors	Electrical Engineering	6
In which direction is the spin of longitudinally polarized W?	High Energy, Nuclear, Particle Physics	6
Pure spin current vs. spin-polarized charge current?	Quantum Physics	1

lufc88	spin polarized current Tweet 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?

Nessdude14	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.