A) \[{{10}^{-9}}c{{m}^{-2}}\]
B) \[{{10}^{-6}}c{{m}^{-2}}\]
C) \[-{{10}^{-9}}c{{m}^{-2}}\]
D) \[-100\,c{{m}^{-2}}\]
Correct Answer: A
Solution :
The surface charge density of the earths is\[{{10}^{-9}}c{{m}^{-2}}.\]
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