Understanding Beam Plasma System Formations

es.no
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hello


I need to know about return current formation at beam plasma system, in a simple way. how It is formed?
 
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Could you be a little more specific? What kind of system are you talking about? Do you have a link to an example?
 
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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