if an electric charge pops into space it's electromagnetic field is constituted everywhere in space instantaneously right? so what aspect of its influence propagates at the speed of light? i know if i perturb the charge then an electromagnetic wave will propagate at the speed of light but i'm considering before that, when the charge just appears? to be clearer: if a charge pops into space its influence propagates at the speed of light ( this i know from herr einstein ), but its field is constituted instantaneously. so what part/form/expression/aspect of its influence is it that propagates at the speed of light?