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Assuming earth to be an isolated conducting sphere of radius 6400 km, what is the capacitance of earth?

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Assuming earth to be an isolated conducting sphere of radius 6400 km, what is the capacitance of earth?

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 Capacitance of earth, 

This shows that farad is a very large unit of capacitance. 

Note: Since capacitance of earth is quite large, we choose earth as a level of zero potential for practical purposes. Think about this ! 

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