1. The problem statement, all variables and given/known data 2. Relevant equations It's given in the answer box. 3. The attempt at a solution Basically, I found that equation for the magnitude of the force experienced from particle 0 by particle 3. I know it to be correct. However, vectors have always confused me, could anybody bump me in the right direction on how to label the equation appropriately with vectors? (using y hat and z hat). The distance between particle 0 and 2 is d2, and between particle 2 and 3 is d3. So it's a 45* angle at the hypotenuse. Would it be F = (kq0q3)y/(sqrt(2d2^2)z)? Thanks!