One thing is bothering me from "the beginning". Let's take one fermion. It has spin, charge and mass (of course). This particle is surrounded with static magnetic field (becouse of it's spin), and with static electric field (becouse of it's charge). Both field (separately) are represeneted as virtual photons in S.M. Well, for el. field we need another fermion close to this one, but that is not a problem. So, what is the difference beetween those two kinds of photons? Spin? And another question: Why do we need to accelerate this fermion that we get electromagnetic field?? What happens with those two kinds of virtual photons that we get real photons? If those fields before were static, E.M. is dynamic (oscilation of those two fields...), right?