[Electromagnetics] Divergence of Current density

kidsasd987
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current_h3.png
eq.1
current_h5.png
eq2.
current_h4.png
eq.3
curr8.png
eq.4Hello, I have a question about eq.4

If we find the closed surface flux integral of J, would it be current?
 
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kidsasd987 said:
Hello, I have a question about eq.4

If we find the closed surface flux integral of J, would it be current?
Yes.
 
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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