Superconductors: Magnetic Levitation (1 Viewer)

[wrxsti]

ok um. i dont really get this.....is this right?
at normal temperatures. a superconducotr will NOT allow a magnetic field to penetrate it.....
at temperatures below critical temperature.. electron pairs move to create a current loop preventing changing magnetic flux. this causes currents in the superconductor to produce a magnetic field in direction opposite to that of the field of the magnet.....

 

[Forbidden.]

ok um. i dont really get this.....is this right?
at normal temperatures. a superconducotr will NOT allow a magnetic field to penetrate it.....
at temperatures below critical temperature.. electron pairs move to create a current loop preventing changing magnetic flux. this causes currents in the superconductor to produce a magnetic field in direction opposite to that of the field of the magnet.....

At normal temperatures, magnetic flux lines can penetrate a conductor.

At temperatures below critical temperature, electrons form Cooper pairs according to BCS theory and move unimpeded throughout the lattice and are able to prevent magnetic flux lines from penetrating it (there's a separate threshold for the magnetic field strength, exceed that and magnetic flux lines can penetrate the material).

Yes, currents in the superconductor produces a magnetic field in a direction opposie to that induced by the magnet.