1. The problem statement, all variables and given/known data A long horizontal wire carries a current of I1 = 48.1 A. A second wire, made of 2.5-mm-diameter copper wire and parallel to the first but a distance d = 14.9 cm below it, is held in suspension magnetically. What is the current I2 in the second wire? (Enter a positive value if I2 is to the right, negative if it's to the left.) 2. Relevant equations B=mu0/2pi*(I)/r 3. The attempt at a solution I am not sure how to calculate I (current) without knowing the B (magnetic field) . Can I use the equation from above to figure out the magnetic fields with plugging in different r values? If so, then would I just set them equal to find the other current?