Two positive charges of 7.4 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction 0.

Two positive charges of 7.4 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction 0.72. If they are originally far apart and then one charge is slowly moved closer to the other charge. At what distance will the charge at rest begin to move if its mass is 2.6 grams? Answer in meters.Answer