1. The problem statement, all variables and given/known data I am looking for the absolute value of the electric field at point A (see picture below) relative to the whole charged rod at the left side. 2. Relevant equations - 3. The attempt at a solution I am not quite sure whether my choice for R and the boundaries of the integral are correct. The solution seems to be legit at first sight, but as I'm just getting started with integrals, I would very thankful for any feedback or advice.