1. The problem statement, all variables and given/known data A) Find the magnitude of the net magnetic field at point P and point Q B) Reverse the directon of the current for the wire on the x-axis 2. Relevant equations B = μ0I/2πr 3. The attempt at a solution Solution attempt attached. Only attempted part A, since I probably won't get part B correct if I'm not getting part A. Tried a few other permutations, but still arrived at similarly incorrect solutions. I'm a bit lost still. I thought adding the magnitudes of the B-fields at the points would give me the solution. Either that or my calculations are wrong, my algebra skills are out of practice.