1. The problem statement, all variables and given/known data Whilst revising the Biot-Savart law, I came across the result: for the magnetic field due to a long straight wire. I understand that this can be found by integrating the Biot-Savart equation over the length of the wire, however after attempting the integral myself and looking at the integration in my notes I find myself unable to understand how to come to the result. 2. Relevant equations 3. The attempt at a solution Outlined above. Any help will be appreciated, thank you.