1. The problem statement, all variables and given/known data Three point charges each carrying a charge of 11.0 µC are located at the corners of an equilateral triangle of side 15.0 cm. Calculate the magnitude and direction of the force on each charge. 2. Relevant equations k = 9.0x109NM2C-2 F = k⋅(Q1⋅Q2)/r2 3. The attempt at a solution See attached. My main problem lies with the solution provided which shows on ii) the solution for the left vertex as arctan of 41.9/72.6 whereas I got 72.6/41.9 as in tan = opp/adj. Is it a typo or have I totally missed the mark???