1. The problem statement, all variables and given/known data In figure. (i1 and i2 are in the same direction. And the formula for field due to straight long wire is to be used.) 2. Relevant equations Magnetic Field(B1) at the conductor carrying I2 current=2i1/d General magnetic field due to a straight long current at point P=2i/r(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??