To good approximation, one can model the two ends of the conductor as parallel plates, so that the magnitude of the electric field throughout the conductor is constant in magnitude and direction and h...To good approximation, one can model the two ends of the conductor as parallel plates, so that the magnitude of the electric field throughout the conductor is constant in magnitude and direction and has strength given by: E=ΔVL Combining this with Ohm’s Law, we have: j=σE∴ Since the current density is a microscopic quantity, we can replace it with the current, I,…
