The electric field emanating from charged particle travels at the speed of light; fine. To pose an unrealistic thought experiment (a more realistic, if more complicated, thought experiment could replace this one, but the unrealistic one gives the idea), if a proton were to suddenly pop into existence at a certain time T in a vacuum, and a stationary electron were situated 300,000 km away (and nothing else in the vicinity), then after one second, at time T+1 (ignoring the difficulty in synchronizing watches ), the electron would start to move towards the proton (and vice-versa, of course) in a straight line between the electron and proton. So far, so classic. However, if that proton is moving, would the electron at the moment T+1 (a) start to move toward the position the proton was at time T, or (b) with a sort of quantum-eraser retroactive effect move toward the position the proton would be at time T+1? (ignoring the effect of any magnetic field created by the moving proton) Thanks in advance.