1. The problem statement, all variables and given/known data There is an equilateral triangle with one point charge at each vertex. The point charges have charges of +Q, +2Q, and -4Q. The length of one side of the triangle is L. Determine an expression in simplest form for the voltage at a point halfway between the +Q and +2Q point charges. 2. Relevant equations V=kQ/r Vnet=V1+V2+V3 3. The attempt at a solution Going off of Vnet=V1+V2+V3: Vnet= (kQ/r) + (k2Q/r) - (k4Q/r) I think once substituting the values for L in place of r, you get: Vnet= (kQ/(L/2)) + (k2Q/(L/2)) - (k4Q/Lcos30) Am I heading in the right direction?