Magnetic field behind superconductors

AI Thread Summary
Calculating the magnetic field behind a superconductor involves understanding the relationship between magnetic flux density (B) and magnetic field strength (H). The effectiveness of superconductors in shielding magnetic fields can be significant, with reported shielding effectiveness exceeding 120 dB under specific conditions. The force experienced when moving a superconductor plate between two magnetic fields can vary, potentially influenced by the polarity of the fields involved. The discussion highlights the complexities of superconductivity and magnetic interactions, suggesting further exploration of existing resources for detailed calculations. Understanding these principles is crucial for applications in magnetic shielding and superconducting technologies.
losbellos
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Hej Guys,

Is there a way to calculate the magnetic field behind a superconductor? I mean the model is like some simple block magnet and a bigger superconductor plate to try to shield the magnetic field. How strong the magnetic field would be above(behind) the SC?

B, H is given.

Also is the force of moving out an SC plate in between two magnetic field is significant? Dependent on polarity or not?

Thank you!
 
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Not my field really. I couldn't google exactly what you asked but perhaps as an example see..

http://www.can-superconductors.com/magnetic-shields.html

Shielding effectiveness (77 K, amplitude 2 mT, frequency 20 Hz – 10 kHz)
> 120 dB
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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