The direction of magnet field

AI Thread Summary
The discussion centers on the behavior of magnetic fields generated by an infinite length of current. It questions whether the magnetic field direction on the mid-vertical plane of a ring maintains the same magnitude and is tangential. Participants emphasize that this scenario is inconsistent with Maxwell’s equations, particularly regarding charge conservation. The implications of a closed surface with zero flux are also considered, reinforcing the connection to fundamental electromagnetic principles. Overall, the conversation highlights the complexities of magnetic field behavior in relation to theoretical constructs.
wuwei
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for a infinite length length of current, only consider a part of it, is the direction of magnet field of a ring on the mid vertical plane the same magnitude and along the tangential direction? and for a closed surface , if the flux is 0?
 

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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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