Quick question about electromagnetic waves travelling through what's basically a capacitor. In the picture I have labelled areas that I'm curious about. 1. Is there a potential induced at A? 2. If yes, is it localized? I suspect the potential would be different at A and B. 3. Is it correct to assume C will be at an equal but opposite potential of A? 4. In the next half cycle, will B be at the potential of A or C? 5. Would an AC current flow if we closed D?