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Find the capacitance of a system consist...

Find the capacitance of a system consisting of a metal sphere of radius a placed at a large distance from an identical metallic sphere.
[Hint: When the distance is large the charges on the spheres may be assumed to be distributed practically uniformly over the surfaces of the spheres. Consider their potential difference and apply `C=Q//V.`

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The correct Answer is:
`2piepsilon_(0)epsilon_(r)a`
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