1. The problem statement, all variables and given/known data A rectangular loop of wire, L = 28.8 cm and W = 15.2 cm, carries a I1 = 2.02 A current and lies in a plane (d = 11.0 cm), which also contains a very long straight wire carrying a I2 = 12.7 A current as shown in the figure below. 2. Relevant equations F=uo*i1*i2*l/perpindicular distance 3. The attempt at a solution So if we label the loop as 1 for the top, 2 for the right side, 3 for the bottom and 4 for the left side we see that 1 and 3 cancel due to symmetry. Then calculating 2 and 3 F2=(4pi*10^-7)(2.02)(12.7)(.288)/.11=.000084N F4=(4pi*10^-7)(2.02)(12.7)(.288)/(.11+.152)=.0000353N The actual answer is 7.79×10-6 N Any combination of F2 and F4 that I have calculated does not give the correct answer, I have tried adding them, subtracting one, subtracting the other. So what have I done wrong?