It doesn't sound like you _would_ be able to maintain a voltage across a superconductor. [Think about what that would mean, in terms of electric charge... very

It doesn't sound like you _would_ be able to maintain a voltage across a superconductor. [Think about what that would mean, in terms of electric charge... very odd. Doesn't sound like something that would happen. It's like saying there's a equilibrium top-heavy-ness to a weighted vacuum tube. The weights should fall, unabated, no matter how many you add at the top.] Doesn't mean you can't have current, though, and modulate the current. Just that you can't use [the superconductor's] voltage to do so.