Question

How far 2 proton be so that electrostatic force exerted. One on another is equal to weight of proton?

Answer 1

The correct answer is 30

Answer 2

F=mg
where m is mass of electron and g is the gravitational acc. F=kQ2/r2 , where Q is the charge, r is the distance, k is constant Deriving, the expression for distance is: r2=kQ2/mg you should get that r = 5m