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- PHY102 Physics II © Dr.Cem Özdoğan
- 25-3 Calculating the Capacitance
- To relate the electric field E between the plates of a capacitor to the charge q on either plate, we use Gauss’ law:
- Here q is the charge enclosed by a Gaussian surface
- is the net electric flux through that surface. In our special case in the figure,
- in which A is the area of that part of the Gaussian surface through which there is a flux.
- the potential difference between the plates of a capacitor is related to the field E by
- If V is the difference Vf -Vi C=q/V=0EA/Ed