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Each of the plates of a parallel plate c...

Each of the plates of a parallel plate capacitor is a circular disc of radius 5 cm. Find out its capacitance if the separation between the plates is 1 mm.

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Radius of each plate, `r = 5cm = 0.5 m`.
Separation between the plates, `d = 1mm = 0.001 m`.
Capacitance, `C = (in_0 alpha)/(d)= (in_0 pi r^2)/(d)`
`= (8.85xx10^(-12)xx3.14xx(0.05)^2)/(0.001)`
`= 6.95 xx10^(-11)F = 69.5 pF`.
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