7A70.25 - Quantum Levitation and Flux Pinning
See also 5G50.50 in Electricity and Magnetism.
Cool the superconductor and press it into the magnet. The superconductor should be pinned at that location until it warms up.
You can also place the superconductor onto the magnets and then cool it to Liquid Nitrogen temperature. The superconductor may rise up off the magnets when it becomes cool, but if it does not you can pick it up and show that it is pinned to the magnet configuration it experienced when it was cooled.
Large Eddy currents in silver may also be observed. Cool the coins in liquid nitrogen and then gently drop them onto the the magnet array as shown in the video below. Note that the large silver dollar coins work best for this demonstration.
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- Quantum Experience Packet, Quantum Levitation Starter Kit, Quantum Levitation Maglev Kit, and Quantum Levitation for Undergraduate and High School Teachers.
- Robert Ehrlich, "L.11. Superconductivity", Turning the World Inside Out and 174 Other Simple Physics Demonstrations, p. 153.
Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.