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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??

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# Homework Help: Electric Potential Problem Assistance

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