What metal is used to concentrate magnetic fields in this video?

AI Thread Summary
The discussion centers on identifying the metal used to concentrate magnetic fields in a referenced video. Participants speculate that mu-metal, known for its high magnetic permeability, is likely the material used. The orientation of the magnet is noted, with the magnetic field being parallel to the metal block surface, which influences its effectiveness. The small plates and large block configuration is also highlighted as crucial to the magnetic field's behavior. Understanding the properties of mu-metal and similar materials is essential for applications involving magnetic field concentration.
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My guess: Mu-metal or something similar.
Note the orientation of the magnet: The magnetic field inside is parallel to the metal block surface, it goes through the small plates and returns in the big metal block.
 
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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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