I am having some trouble getting started with this problem. Do I want to use kq/r^2 at all or should I be doing something else? The problem is: Two point charges, Q1=-6.7 microCoulombs and Q2= 1.3 microcoulombs, are located between two oppositely charged plates. (The positively charged plate is located nearer to Q1 and the negatively charged plate is located closer to Q2). The two point charges are separated by a distance of x= 0.34m. Assume that the electric field produced by the charged plates is uniform and equal to E=73,000N/C. Calculate the net electricstatic force on Q1 and give its direcion.