The earth's surface has a negative surface charge density of $10^{- 9} C m^{- 2}$ . The potential difference of $400 k V$ between the top of the atmosphere and the surface results (due to the slow conductivity of the lower atmosphere) in a current of only $1800 A$ over the entire globe. If there were no mechanism of sustaining atmospheric electric field, how much time (roughly would be required to neutralize the earth's surface ? (Radius of earth $= 6.3 \times 10^{6} m$ )
$283 s$
$277.2 s$
$299 s$
$200 s$

200 s

283 s

299 s

277.2 s

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