Honors Physics

Coulombs Law Equlibrium Problem

Three charges lie along the x-axis. One positive charge, q1 = 15 uC, is at x = 2.0 m, and another positive charge, q2 = 6.0 uC, is at the origin. At what point on the x-axis must a negative charge, q3 , be placed so that the resultant force on it is zero?