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• October 21, 2021

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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

• i

• f

• antiparallel

• only geometrical factors