1. The problem statement, all variables and given/known data A long horizontal wire carries a current of 48 A. A second wire, made of 2.8 mm diameter copper wire and parallel to the first, is kept in suspension magnetically 15 cm. Determine the magnitude of the current in the lower wire. 2. Relevant equations I know that F/L=(μ0*I1*I2)/(2∏r). 3. The attempt at a solution By using that equation I am not sure how to solve for F/L. Otherwise I know μ0=4∏*10^-7, I1=48A and r=0.15 m. I also know that I am solving for I2. My main problem is the left side of the equation.