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A spherical capacitor consists of two concentric spherical conductors, held in position by suitable insulating supports (Fig). Show that the capacitance of a spherical capacitor is given by $ C= \large\frac{4 \pi \in_0 r_1r_2}{r_1-r_2}$ where $r_1$ and $r_2$ are the radii of outer and inner spheres, respectively.

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