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Question

Let us suppose that earth (radius 6400 km) had a net charge equivalent to one electron per m2 of its surface area. Its potential in volts will be:

A
1.2
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B
0.12
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C
0.12
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D
1.2
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Solution

The correct option is A 0.12
Consider earth as a big conducting sphere with σ=1.6×1019 Cm2
potential of a conducting sphere=kσ4πR
=9109×1.61019×4π×6400103
0.12V

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