Field generated by a moving charge

AI Thread Summary
The discussion centers on the electric field generated by a moving charge, referencing Feynman's Lecture on Physics. A key point raised is the confusion surrounding a charge moving at the speed of light and its implications for the electric field it produces. It is clarified that a charge cannot move at the speed of light, which resolves the concern about generating an infinite field due to superposition. The conversation emphasizes the importance of understanding the limitations of charge velocity in relation to field generation. Overall, the discussion highlights fundamental concepts in electromagnetism and the behavior of electric fields.
yjoe61
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I was reading Feynman's Lecture on Physics, chapter 28, where he mentioned the formula for the electric field generated by a moving charge.

One thing I don't understand is that, if the charge moves at the speed of light towards the point of interest, then it moves at the same speed of the field it generates. Then wouldn't it generate infinite field along the path it moves, since the field will be a superposition of infinite number of fields?
 
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The charge CANNOT move at the speed of light.
 
Thanks. That makes sense.
 
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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