The magnitude of the average electric field normally present in the earth's atmosphere just above the surface of the earth is about 150 N/C, directed downward. What is surface charge density of the earth? [Assume that the earth is a conductor having uniform surface charge density.]
0.53×10−9C/m2
1.33×10−9C/m2
2.5×10−9C/m2
8.85×10−9C/m2
The correct Answer is:B
∵E=σε0
∴Surface charge density σ=ε0E
=(8.55×10−12)×150=1.33×10−9C/m2
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