Note: ^i means carrot on top of variable 1. The problem statement, all variables and given/known data A particle with charge 4 µC is located on the x-axis at the point 10 cm, and a second particle with charge -3 µC is placed on the x-axis at 4 cm. What is the magnitude of the total electrostatic force on a third particle with a charge 4 µC placed on the x-axis at -2 cm? Answer in units of N. 3. The attempt at a solution 1) I converted all my variables to µC = C , and cm = m q1 = 4 µC = 4e-6 q2 = -3 µC = -3e-6 q3 = 4 µC = 4e-6 x1 = 10 cm = 0.1 m x2 = 4 cm = 0.04 m x3 = -2 cm = -0.02 m 2 By using Coulom's law in vector form: F13= ke(q1q3/r2)^r13 where ^r13 is a unit vector directed from q1 to q3; i.e., ->r13 = ->r3 - ->r1 x13 = x3 - x1 (-0.02m)-(0.1m) = -0.12m x23 = x3 - x2 (-0.02m)-(0.04) = -0.06 m ^x13 = x3-x1/ √(x3-x1)^2 = -1 or -^i ^x23 = x3-x2/ √(x3-x2)^2 = 1 or +^i Since the forces are collinear, the force on the third particle is the algrebracis sum of the forces between the first and third and the second and third particles. ->F = ->F13 + ->F23 = ke [q1/ r213 X ^r13 + q2 / r223 x^r13 ] q3 After putting in the variables, I got 33.9444444445 N as my answer, but was wrong. What did i do wrong?