1. The problem statement, all variables and given/known data A finite line of uniform charge is on the line joining (4,0,0) (0,8,0) and has λ= 2μC/m find E at (0,0,0) 2. Relevant equations E = Q / (4 π ε0 r^2) dQ = λ dl = λ dx 3. The attempt at a solution I first notice that r will depend on 2 changing values x and y. I write an equation for the line. y = 8 - 2x I use this relation to find r in terms of x r = sqrt ( x^2 + (8 - 2x)^2 ) I set up my integral λ / (4 π ε0 r^2) ∫ < -x , 2x - 8> dx / [ x^2 + (8 - 2x)^2]^(3/2) from x=0 to x=4 when I evaluate I get <-2250 , -2250> This does not seem correct to me. Based on the location of the line to the origin I would expect my x component to have a larger magnitude than the y component. I am not sure where I am going wrong.