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

Options

A. `(epsilon_(0) e)/(mg)`
B. `(epsilon_(0) mg)/(e )`
C. `(mg e)/(epsilon_(0))`
D. `(mg)/(e epsilon_(0))`

Answer

2

Explanation

`(e sigma)/(in_(0)) = mg`
`sigma = (mg in_(0))/(e )`