Superconductors are make love for their complete want of electrical resistance to electrical flowing . They also have less widely - know quirk — they make magnets hover .
Superconductors are fabulously utile in laboratory and medical configurations . Provided the temperature is low enough , they have no immunity to electrical current . They are literally the everlasting conductors . But they ’re really wearisome to look at . Some are cool by liquid nitrogen , so a photographer can get a prissy shot of steam come up around the superconductor , but it ’s still just steam swirling around a chunk of average - looking material . To liven up the image , most semi - conductors are pictured with another object levitating above them . That something is a magnet .
Magnets are known for their attractive properties . What is it about a superconductor that make them defy gravity for get aside ? And if they are being beat back , why do n’t they just fly by from the superconductor ? Why do they just oscillate ?
It turn out that the attraction and the superconductor are both attracted to and beat back by each other . As the temperature drops and the superconductor kicks into cogwheel , The Meissner Effect derive into play . The Meissner Effect is the tendency for a superconductor to expel magnetic fields from its Department of the Interior . The field is return by the magnet , so the superconductor fight the magnet away . ( Or the magnet promote the superconductor away . )
If the attracter gets forced nearer to the superconductor , though , some of the magnetic field lines do manage to sink into the superconductor due to imperfections on its surface . This part of the field gets entrap , and when the two objects are release , it exert a pull to keep them where they were . They still feel the repulsion , though , and so the pull and press counteract each other , and the two objects hand an sense of balance a certain distance aside . pick up the attractor will get the superconductor to come after . They ’re stuck in their own , personal disfunctional relationship .
[ ViaHow it ferment , Hyperphysics , and theUniversity of Oslo . ]
magnetismPhysicsSciencesuperconductors
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