I Posted this earlier, but didn't get a reply =( 1. The problem statement, all variables and given/known data Check link. (i1 and i2 are in the same direction. And the formula for field due to straight long wire is to be used.) https://www.physicsforums.com/showthread.php?p=2434701#post2434701 2. Relevant equations General magnetic field due to a straight long current at point P=μ0i/2πr(r=perpendicular distance between the conductor and the point P) 3. The attempt at a solution I just need some hints to work on. Please help! EDIT: These are the steps I came up with: 1)Find B1 due to conductor carrying i1 2)Find B2 due to conductor carrying i2(taking distance as (d-r)) 3)Subtract the two to get net field. 4)Integrate. But how do I eliminate the i2 from the expression?? And B is non-uniform in the problem, so this approach is incorrect anyway=( Please help!