The capacitance of a spherical capacitor which consists of two concentric spherical shells of radii a and b (a < b) as shown in Fig. is given by:
1
\(C = 4\pi \varepsilon \left( {\frac{{ab}}{{b - a}}} \right)\)
2
\(C = 2\pi \varepsilon \left( {\frac{{a + b}}{{b - a}}} \right)\)
3
\(C = 4\pi \varepsilon \left( {\frac{{a + b}}{{ab}}} \right)\)
4
\(C = 2\pi \varepsilon \left( {\frac{{a + b}}{{a - b}}} \right)\)