1. The problem statement, all variables and given/known data I can find the e-field at point P. 2. Relevant equations I get, easily enough, the correct integral solution (for the y-component, Ey - which is all I need to do): which I can see, informally, evaluates to: which is the correct answer. 3. The attempt at a solution My question: is it, technically, sufficient for me to simply explain: "well, when evaluated, the infinity in the numerator cancels with sqrt(infinity^2) in the denominator? Or can I offer a more rigorous explanation? I tried L'Hôpital's Rule, but it doesn't seem to lead anywhere as far as showing anything definitive. Thank you - any hints are appreciated!