Capacitance

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Of a plane (area S):

C = $\displaystyle \epsilon$ ₀ $\displaystyle \epsilon$ S/d

Of a cylinder (inner radius a, outer radius b, length L):

C = 2 $\displaystyle \pi$ $\displaystyle \epsilon$ ₀ $\displaystyle \epsilon$ L/ln(b/a)

Of a sphere (inner radius a, outer radius b):

C = 4 $\displaystyle \pi$ $\displaystyle \epsilon$ ₀ $\displaystyle \epsilon$ /(1/a - 1/b)

Toan T Nguyen 2004-09-06