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In Griffith's electrodynamics he writes about poynting's theorem.He considers some charge and current configuration. Then he says that these charges move.Which charges is he talking about and why would they move?
Any charges moving for any reason. It is a general proof.Which charges is he talking about and why would they move?
Ok the current density J which comes in proceeding steps is due to motion of these charges but when he uses ampere Maxwell law he relates it to same E and B which are due to some other source.Any charges moving for any reason. It is a general proof.