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Why is earth considered as zero of poten...

Why is earth considered as zero of potential in practice ? Justify.

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If we consider earth to be a conducting sphere surrouded by air its capacitance will be equal to `4 pi in_(0)R`. Since redius R of earth is very large. So capacitance is also very large. If a charge q is given to earth, it will increase its potential by
`V = (q)/(C )` , As C is very large,
`:. V rarr 0` for all finite charges. Hence earth is considered as zero of potential.
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