A) \[{{10}^{-9}}\]
B) \[-{{10}^{-9}}\]
C) \[{{10}^{-9}}\]
D) \[-{{10}^{-9}}\]
Correct Answer: D
Solution :
Charge on the earth \[=-0.5\times {{10}^{6}}C\] Charge density \[=\frac{charge}{area}\] Charge density \[=\frac{0.5\times {{10}^{6}}}{4\pi \times {{(6400\times {{10}^{3}})}^{2}}}\] \[=-{{10}^{-9}}C{{m}^{-2}}\]
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