Spin Polarized Current: Magnetic Moment & Interaction

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Normal current generates a magnetic moment due to the net motion of charged particles, despite equal spins of electrons, because the overall movement creates a magnetic field. A wire with all electrons polarized up would attract a wire with all electrons polarized down due to opposite magnetic moments. Superconductors exhibit no magnetic field internally because they expel magnetic fields through the Meissner effect, preventing magnetic field lines from penetrating. This phenomenon occurs even though charged particles are moving, as superconductivity alters the behavior of electrons. The discussions highlight the intricate relationship between electron spin, charge movement, and magnetic fields in different materials.
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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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