Hi... I have hopefuly simple question, which however drives me crazy... I know how to mathematically derive that infinite line of charge has its electric field inversly proportional to the distance from it and also I know how to derive that infinite plane of charge has its electric field constant. Nevertheless I don't see why is this. Why the E-field of infinite line changes, but one of infinite plane does not? I mean I don't see the physical reason for it. Thanks for any help.