Hey, Assume I have a very large tank of some liquid with uniform but medium conductivity. I now insert two fine wires into the tank some distance (D) apart, and create an electrical potential difference between them (V). 1) If I were to take my voltmeter (input impedance very high, so we assume it draws no current itself), with its two fine-tipped probes fairly close together (<<0.1 * D), what would the voltage readings look like in different parts of the tank? 2) Now, let's say I drop a flat bar of metal (much more conductive than the liquid) somewhere in the tank between the original probes. How does it affect the voltmeter readings from 1) if the bar is very short? If the bar is long enough to occupy some significant fraction of D?