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.]

Options

A. `0.53xx10^(-9)C//m^(2)`
B. `1.33xx10^(-9)C//m^(2)`
C. `2.5xx10^(-9)C//m^(2)`
D. `8.85xx10^(-9)C//m^(2)`

Answer

B

Explanation

`because E=(sigma)/(epsi_(0))`
`therefore`Surface charge density `sigma=epsi_(0)E`
`=(8.55xx10^(-12))xx150=1.33xx10^(-9)C//m^(2)`