The temperature of a piece of gadolinium is measured with a thermocouple while it is between the poles of an electromagnet. 200 Cool a superconductor and a magnet floats over it due to magnetic repulsion. Disc 16-14 Place a small powerful magnet over a disc of superconducting material cooled to liquid nitrogen temperature. A long article on levitation over superconductors showing several variations. Also, levitation of the magnet over the superconductor.
Students can play with the magnet and feel the force.
Discussion of what the Meissner effect really is. Theoretical article - a discussion of levitation and other effects using Maxwell's work on eddy currents in thin conducting sheets instead of the London equation.