
#1
Nov1412, 02:57 AM

P: 9

Magnetic suspension and levitation is the caused by the flux trapping effect in superconductors.How does this flux get "trapped"?
Another quick question We link a magnet to a superconductor by bringing it very close to one ,until both of them start attracting and repelling. My question is, if the magnetic field strength of this magnet is greater than the critical field of the superconductor,the superconductor will lose its properties and become normal, instead of demonstrating magnetic levitation and suspension ,right ? 



#2
Nov1412, 07:36 PM

P: 109

This phenomena is called the Meissner Effect. Wikipedia offers a great explanation of the subject. If you are looking for a mathematical explanation, you should look up the "London Equations" I believe the explain the expulsion of flux mathematically.
http://en.wikipedia.org/wiki/Meissner_effect http://en.wikipedia.org/wiki/London_equations 



#3
Nov1512, 04:22 AM

Sci Advisor
PF Gold
P: 2,194

The flux lines are trapped around impurties, gain boundaries etc. The math is quite complicated, but can be found in standard textbooks (see e.g. Tinkham) 


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