1. The problem statement, all variables and given/known data Four point charges are situated at the corners of a square with sides of length a. Find the resultant force on the positive charge q. HINT: write an expression for the resultant force, use Ke for Ke, q for q, and a for a! That makes sense, because not much information is given. HERE is a picture. 2. Relevant equations F=Ke ( q1q2 / m^2 ) Ke is the constant 8.99e9 Nm^2/C^2. Q1 and Q2 are any two charges of interest. That m^2 basically means the distance between two should be charges squared. So if distance between two charges is 5 cm, then it should be (0.05m)^2. 3. The attempt at a solution F of top left negative charge on positive charge = Ke ( q^2 / a^2 ) ? F of top right negative charge on positive charge =Ke ( q^2 / ( (2sqrt(a))^2 ) ? F of bottom right negative charge on positive charge = Ke ( q^2 / a^2 ) ? I don't know what I'm doing. I figured that if you make a 45 45 90 triangle out of that square, the length between the positive charge and the top right charge should be 2sqrt(a). Other than that I do not know.