This experiment actually gets very feasible if we replace electrons with ions, and the metal carrier with (e.g.) an aqueous electrolyte in an electrochemical ci

This experiment actually gets very feasible if we replace electrons with ions, and the metal carrier with (e.g.) an aqueous electrolyte in an electrochemical circuit. Something like splitting water in H2SO4 would be an easy starting point. This means our charges no longer move at relativistic speeds, and have very short mean free paths, therefore it is possible to flow water[0] against the electrical flow of ions at greater than the mean diffusion speed. My not overly confident understanding[1] is that this does in fact break the circuit and prevent the flow of current. Also worth noting, by choosing a colorful ion choice of ion it is possible to directly observe their formation and travel. You can also use electrons as your negative ion directly in liquid ammonia, forming a pretty deep blue solution. [0]Aqueous or other electrolyte. [1]My theoretical echem is a bit rusty, so ymmv.