Which free body diagram is in equilibrium? question 5 options: 1)a 2)b 3)both a and b. 4)neither a nor b.

A I think sorry if its wrong

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)