Two $4\mathrm{.}0$cm$4\mathrm{.}0$cm metal electrodes are spaced $1\mathrm{.}0$ mm apart and connected by wires to the terminals of a $9\mathrm{.}0$ V battery. What is the charge on each electrode? What is the potential difference between them? While the plates are still connected to the battery, insulated handles are used to pull them apart to a new spacing of $2\mathrm{.}0$ mm$.$ What is the charge on each electrode? What is the potential difference between them?