OK,I have not studied any quantum field theory but ever since I heard of charges interacting by exchanging virtual photons I have been wondering what determines the energy of the virtual photons. Classically this attraction/repulsion follows inverse square law but does it break down at quantum level ? This force of interaction should depend both on the number of photons and their energy ? And what determines the energy of those photons ? Just the quantum fluctuation ? Or also the energy possessed by that charged particle ? And what precisely determines whether a photon emitted from a charged particle will repel or attract a negative charge ? Do photons emitted by a positive charge carry some sort of "signature"on them,indicating what they will do to another positive or negative charge ?
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