1. The problem statement, all variables and given/known data Two identical long wires of radius a = 2.90 mm are parallel and carry identical currents of i = 5.00 A in opposite directions. Their center-to-center separation is W = 17.0 cm. Neglect the flux within the wires but consider the flux in the region between the wires. What is the inductance per unit length of the wires? The problem looks like this | | 2. Relevant equations L = Flux/Current Flux = B*A 3. The attempt at a solution What I did was integrate (10^-7)2I/x from r to w-r. After the integration I multiplied by d (variable I assigned as the height of the configuration) because I need the total magnetic field that goes through the entire area between the wires. Then I doubled this result because both wires create magnetic fields with the same magnitude and direction in the entire area. Next, I multiplied this result by the area of the section between them which I got to be d(w-2r) -- d is the height of the wires, however, I am aware that in the context of the problem the wires are infinitely long. Lastly I divided by I*d to get the inductance. My final expression is 4d(w-2r)(10^-7)[ln(w-r)-ln(r)] I calculated the answer and it is wrong. Some help would be amazing! Thanks!