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When deriving Ohms law from basic principles (at an introductory physics level) the electric field is always assumed to be constant in a wire (like the electric field between two capacitor plates that are close together). However, a wire may be very long and the distance between the postive and negative terminals can be very far away, yet the electric field is constant. I think I can answer this based on atoms (electrons and protons in a metal), but how is this done classically (or what is your atomic explanation)?