Who can explain this?
The black block is a high-temperature superconducting material. The silver
disk is a strong magnet. When the superconductor is cooled with liquid nitrogen and becomes superconduction, any movement of the magnet generates an opposing eddy current in the superconductor. By Lenz's law, this eddy current produces an opposing magnetic field that opposes any movement of the magnet. Since there is no resistive loss in the superconductor, the magnet just stays where it is left. -- Bob (Chief Pilot, White Knuckle Airways) "Mastic" not@thisaddress wrote in message ... http://www.metacafe.com/watch/55826/..._explain_this/ |
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