As shown below, an infinite number of point positive charges of 8.0 C are placed on the x-axis at x=a, 2a, 4a, 8a, ... with a=18 cm. Find the electric potential (in V) at the point x=0. 0---a----2a---4a-----8a------- Ok so i'm using the equation V=1/(4piEpsilon)Sigma(q/r). and it's not working! I don't understand what i'm doing wrong it should be pretty easy. Please help. I'm using 8 Coulombs as my q and r is my changing variable. I'm getting 88.88 and it's not working.