Symmetry associated with conservation of electric charge.

azabak
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What symmetry of nature yields the conservation of electric charge?
 
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azabak said:
What symmetry of nature yields the conservation of electric charge?

Gauge symmetry of EM (arbitrariness of electric potential up to an additive constant and equivalently phase shift invariance of wavefunction in QM).
 
Thank you.
 
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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