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DaleSpam
#3
Dec11-12, 06:11 AM
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P: 17,535
Quote Quote by Barry_G View Post
I don't see any reference to "source-free" equation or anything similar that would relate to zero net charge of a photon.
It was on that page that you were already given. Here is the direct link so you cannot miss it.
http://en.wikipedia.org/wiki/Maxwell...speed_of_light

Btw, none of your questions are actually about photons. They are about classical EM. Specifically, you want to know how you can have EM fields in the absence of a charge. Maxwells equations in vacuum are the answer to that question.