Magnetic fields due to currents

alex36
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My syllabus has point
*' 'describe and compare the forces on mass, charge and current in gravitational, electric and magnetic fields, as appropriate"

what does this mean ?
 
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Compare the intrinisic strengths of these forces. You'll see which is strong and weak.
 
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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