1. The problem statement, all variables and given/known data How far apart must two electrons be placed on the Earth's surface for there to be an electrostatic force between them equal to the weight of one of the electrons? 2. Relevant equations Fe = (1 / 4∏ε0) X (q1q2 / r^2) 3. The attempt at a solution I set Fe = me- (electrical force = mass of electron). and solved for r = sqrt( q^2 / (me-)(4∏ε0) ) = 15.98 m, but the answer should be 5.08 m..