The large blue arrow on the top left shows the direction of the correcting force that is being applied to remedy the situation. These are the basic principles behind how a maglev train works. The following is a list of different techniques that are often interchanged with maglev. These are the main techniques used to levitate objects, and the first three techniques are especially useful in levitating trains. Superconductors are essentially materials that offer virtually no resistance at very low temperatures.
Resistance is caused by the scattering of valence electrons due to impurities in the metal.
In a superconductor, the electrons stay in place. In the presence of certain magnetic fields, this condensing of electrons vanishes. In fact, when a current is introduced through a superconducting wire that has been looped about, a very powerful magnetic field is produced. After all, a magnetic field, B is nothing more than the motion of charges, or current. The faster the velocity and the more moving charges, the more force is produced.