Electric Potential Problem Assistance!!!! 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, +3Q and -4Q respectively. The length of one side of the triangle is L. Determine an expression in simplest form for the electric potential at a point halfway between the -Q and +3Q point charges. Simplest form means that the answer is factored completely and consists of only one simple fraction. 2. Relevant equations V=kQ/r Vtot=V_1+V_2+V_3 3. The attempt at a solution I tried to solve for each missing length "L" I figured that between charges -Q and +3Q it was L/2 because we are looking at a point halfway between them. But I am confuse how to show this through individual calculation of electric potential because L is a variable??