If the net electric field inside a conductor is zero, how come electrons flow on applying potential difference across it? What force acts on the electrons? We've been taught that an electric field E sets up, so the force on electrons is eE (e=charge on electron). acceleration a=eE/m (m=mass of electron) and then they calculated drift velocity. But by Gauss' Law, Electric field inside a conductor is zero, so thre must be no force on the electrons.