1. The problem statement, all variables and given/known data Lets say I have an equilateral triangle, and you are asked to calculate the net force on the top of the triangle 2. Relevant equations Coulombs Law 3. The attempt at a solution I know to use Coulombs law to find the forces acting on the top of the triangle, then since it is an equilateral triangle, the angle would be 60 degrees and you use that to find the x and y components of the forces acting on the top. The x components of the the resultant would cancel out = 0 The y components would be some number. Then you would just use pythagorean theorem to find the overall net force. However when you find the direction: Tan inverse of Ry/Rx Rx would be 0 therefore it is undefined. Does that mean that the direction of the net force on the top of the triangle would be 0 degrees?