posted by hashi .
how far apatr should two electrons be if the electric force each exerts on the other is equal to the weight of an electron ? ( take the mass of an electron to be Me = 9.11 x 10-31 kg ).
Use F=ma to find the weight of an electron, use a=9.8 m/s^2
use coulombs law
use k=8.99 x 10^9 N m^2/C^2
and Q1=Q2=1.60x10^-19 C