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## Main Question or Discussion Point

Consider a capacitor which is just like a plate capacitor, but instead of the upper electrode being a plate it is a point charge Q. the lower plate is held at a fixed potential V=0.

how could you calculate the capacitance of the system?

when trying to calculate - it looks like it will be 0 since the potential near the point charge is inifinite and so is the potential difference between the two electrodes, and the C=Q/V is 0...

how could you calculate the capacitance of the system?

when trying to calculate - it looks like it will be 0 since the potential near the point charge is inifinite and so is the potential difference between the two electrodes, and the C=Q/V is 0...