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#### Question

A spherical capacitor consists of two concentric spherical conductors, held in position by suitable insulating supports (Fig. 2.36). Show

what the capacitance of a spherical capacitor is given by

`C=(4piin_0r_1r_2)/(r_1-r_2)`

where *r*_{1} and *r*_{2} are the radii of outer and inner spheres, respectively.

#### Solution

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