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Two conducting spheres of radii R1 and R2 are kept widely separated from each other. What are their individual capacitances? If the spheres are connected by a metal wire, what will be the capacitance of the combination? Think in terms of series-parallel connections.

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The combination is necessarily parallel.
Hence Ceq = 4πε0R1 +4πε0R2 = 4πε0(R1 + R2)

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