1. The problem statement, all variables and given/known data A nonconducting rod of length L = 8.15cm has charge -q = -4.23 fC uniformly distributed along its length. What are the magnitude and direction [relative to the positive direction of the x axis] of the electric field produced at point P, a distance a = 12.0cm from the rod? NOTE: In the illustration, the rod and P are along the x axis, and P is to the right of the rod (assumed to be the positive end). 2. Relevant equations dE = dq/(4*pi*E0*r2) dq = Lambda*dx E0 = permeativity of free space = 8.85x10-12 Lambda = linear charge density = q/L 3. The attempt at a solution I am not sure how 'L' and 'a' are to replace 'r' in the equation above. I have tried r = L + a, but it seems this method does not correctly describe the situation. I then tried to integrate the equation along the limits from 0 to L, but am not sure how to include the additional distance of 'a' into the equation. This seems like a fairly simple question, but my text does not extensively pursue this topic.