1. The problem statement, all variables and given/known data Two wires are placed parallel near each other in free space at a distance of d=0.08m. They have a length of L=0.4m and each carry a current of i=3.7A (in the same direction.) Find the force exerted on each other. Consider attraction as positive force and repulsion as a negative force. 2. Relevant equations F = B*I*L B= = u*Hs = (u*I/(2*PI*R))*I*L 3. The attempt at a solution 4*PI*10^-7*3.7/(2*PI*.04)*3.7*.4 = 27.38uN The correct answer is apparently 13.69N. Anyone see where I am going wrong? Is my B equation incorrect? Thanks!