Find (a) the capacitance of an isolated conducting sphere of radius 9cm in air, and (b) the capacitance of a s

Numerical · Q25

Q. Find

(a) the capacitance of an isolated conducting sphere of radius

9\ \text{cm}

in air, and

(b) the capacitance of a spherical capacitor formed by two concentric conducting shells of radii

6\ \text{cm}

and

9\ \text{cm}

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Isolated sphere, $R=0.09\ \text{m}$ : $C = \frac{R}{k} = \frac{0.09}{9\times 10^9} = 1\times 10^{-11}\ \text{F} = 10\ \text{pF}$
Concentric spherical capacitor, $a=0.06\ \text{m}$ , $b=0.09\ \text{m}$ : …

Q.Find