How is the Electromagnetic field created?

I know if you accelerate electrons you get EM energy, but do they actually create it or do they excite a neutral field that's already there, like dropping stones into a still pond. In other words, is there an all-ecompassing EM field that already exists everywhere or is it directly generated from the electrons... show more I know if you accelerate electrons you get EM energy, but do they actually create it or do they excite a neutral field that's already there, like dropping stones into a still pond. In other words, is there an all-ecompassing EM field that already exists everywhere or is it directly generated from the electrons themselves? Also, do other charged particles (like protons) produce EM energy when they are accelerated?
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