1. The problem statement, all variables and given/known data A nonconducting rod of length L = 6.00 cm and uniform linear charge density λ = +2.28 pC/m. Take V = 0 at infinity. What is V at point P at distance d = 8.00 cm along the rod's perpendicular bisector? heres the diagram best I could show it: .P | | | | <+++++++++++++++++++++> <------L/2---|------L/2-----> 2. Relevant equations v=kq/r lamda = charge/L 3. The attempt at a solution What I did was this charge = L(lamda) the I said ∫kq/d ds which equals ∫klamda(L)/d * cos(theta) ds (where cos(theta)=d/sqrt(d^2+(L/2)^2)) so 2klamdaL∫1/sqrt(d^2+(L/2)^2) from 0 to L/2. which gives me 2klamdaL(log(sqrt(2L^2)+L) when I plug in the answer is incorrect I think my integral set up is completley incorrect? Moderator note: Moved to the introductory physics forum.