Monday, December 8, 2014

Do the electric and magnetic components of an electromagnetic wave really generate each other?


Frequently when EM waves are taught, it is said that the change in electric field causes a change in the magnetic field, which then causes a change in the electric field, and so on and so forth.


But from my understanding of basic electromagnetics, it is not necessarily a changing electric field that creates a change in magnetic field, but instead an accelerating charge. and it is this charge that creates both the electric and magnetic field. Again, from my understanding, a changing magnetic field is not generated by a changing electric field, but instead just happens to always be present perpendicular to a changing electric field due to the laws of electromagnetism.



Am I wrong? Or is the "mutual generation" concept between the electric and magnetic components of an EM wave an actual thing?




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