Question

if the earth is considered a metalic sphere of
radius R = 6400 km. and IC of electric
charge is supplied to it. Then find the electric
potential on the surface of the earth.
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Answer 1

Answer:

Consider earth as a big conducting sphere with $\large\rm { σ = -1.6 × 10^{-19} Cm^{-2} }$

$\large\rm { potential \ of \ a \ conducting \ sphere \ = kσ4πR }$

$\large\rm { = 9×10⁹ × -1.6 × 10^{-19} × 4 \pi × 6400 × 10³ }$

That is approximately equal to 0.12 V