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Find the surface density of electric ch...

Find the surface density of electric charge at a place on the earth's surface, where the rate of fall of potential is 2.5 V.

A

`2.0xx10^(-9)C//m^(2)`

B

`2.21xx10^(-9)C//m^(2)`

C

`3.36xx10^(-9)C//m^(2)`

D

`3.5xx10^(-9)C//m^(2)`

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