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Nov 20, 2023 at 20:16 comment added LPZ The grounded sphere/plane are classic examples because the formulas are simple. Already the capacitance of two conducting balls is pretty involved because virtual charges generate new ones. In general, you can analyse 2D situations (or 3D with translation invariance) using conformal maps. This will typically require more than one virtual charge per real charge.
Nov 18, 2023 at 17:05 comment added Jelly Qwerty Are there any examples of the "virtual charge"? are there any problems and solutions I could refer to?
Nov 18, 2023 at 15:18 history answered LPZ CC BY-SA 4.0