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If the earth's surface is treated as a c...

If the earth's surface is treated as a conducting surface with some charge , then the order of magnitude of the charge per unit area `sigma "in" C//m^(2)` , so that a proton remains suspended in space near the earh's surface will be

A

`10^(-18)`

B

`10^(-12)`

C

`10^(-6)`

D

`1`

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