Re-use of this resource is governed by a Creative Commons
Attribution-
NonCommercial-ShareAlike 4.0 International
https://creativecommons.org/licenses/by-nc-sa/4.0/
A section of superconducting material is cooled using
liquid nitrogen and then placed on a magnetic track. The material expels
the field produced by the track and causes it to levitate.
The superconductor sets up surface currents which cause
the applied field from the track to be completely expelled.
As the superconductor heats up through its transition
temperature, the field from the magnetic track begins to penetrate and
the sample ceases to levitate.