Poynting's Theorem, as discussed in Griffiths' Electrodynamics, addresses the behavior of moving charges and their relationship to electric and magnetic fields. The theorem asserts that currents arise from the motion of charges, which can accelerate due to forces from these fields. The discussion emphasizes that any charges in motion contribute to the current density J, and this is linked to the electric field E and magnetic field B generated by other sources. The general proof presented applies to all moving charges, underscoring the fundamental nature of electromagnetic interactions.
PREREQUISITESThis discussion is beneficial for physics students, educators, and researchers focusing on electromagnetism, particularly those studying Griffiths' Electrodynamics and Poynting's Theorem.
Any charges moving for any reason. It is a general proof.Zubair Ahmad said: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.Dale said:Any charges moving for any reason. It is a general proof.