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File:Stickstoff_gekühlter_Supraleiter_schwebt_über_Dauermagneten_2009-06-21.jpg · Wikimedia Commons · See Wikimedia Commons

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thumb|A high-temperature superconductor levitating above a magnet. A persistent electric current flows on the surface of the superconductor, acting to exclude the magnetic field of the magnet (Meissner effect). This current effectively forms an electromagnet that repels the magnet.

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Superconductivity is a special state of certain materials where electric current can flow indefinitely without any resistance, and the material actively pushes away magnetic fields—an effect called the Meissner effect. This matters because it enables remarkable applications like magnetic levitation, where a superconductor can float above a magnet due to the repulsive force created by the persistent current flowing across its surface.

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Subclass of
physical state
Image
Magnet 4.jpg
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topic's main category
Category:Superconductivity
Commons category
Superconductivity
studied by
BCS theory
on focus list of Wikimedia project
Wikipedia:Vital articles/Level/4
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