1. The problem statement, all variables and given/known data Calculate the magnitude of the electric field at the origin due to the following distribution of charges: -q at (x,y) = (a,a), -q at (a,-a), +q at (-a,-a) and +q at (-a,a). Where q = 8.30 × 10-7 C and a = 5.15 cm. 2. Relevant equations E = KQ/R^2 or KQ/2a^2 The summation of E = E1 + E2 + E3 + E4 3. The attempt at a solution I calculated this with the + and - signs and got 0 because their are two signs for each one and they are all the same charge. I did this without the signs and got 5.63E6 N/C.