1. The problem statement, all variables and given/known data Here is the question: http://dl.dropbox.com/u/64325990/HW%20Pictures/infinite%20current%20sheet.PNG [Broken] 2. Relevant equations ∫B(dot)dl = μoIencl 3. The attempt at a solution Here is my attempt: http://dl.dropbox.com/u/64325990/HW%20Pictures/Photo%202012-04-06%2010%2045%2008%20PM.jpg [Broken] According to the answer key my answer too large. The answer key has a coefficient of 1/2 in front of my answer... What did I do wrong? For my solution there is magnetic field in the sheet so the path is just L.