Question

How far apart must two protons be if the magnitude of the electrostatic force acting on either one due to the other is equal to the magnitude of the gravitaional force on a proton at the earth's surface?

Answer 1

I got 6.94855*10^24 meters but this seems way to big

Answer 2

Fe = k q1 q2 /R^2 = 9.81 ( 1.67*10^-27)
where k = 9*10^9
q1=q2 = 1.6*10^-19

R^2 = 9*10^9 * 2.56*10^-38 /(16.4*10^-27)

= 1.4 * 10^-2

take square root
R = 1.2 * 10^-1 = .12 meters