I've been stuck on this problem from a few hours now. It seemed much easier when I started it. - A square wire loop has sides 2 meters long, with a current 5 amps circulating in the loop. What is the magnetic field at the exact center of the loop? I was going the direction of the law of Biot and Savart and integrating to get B = u0/4pi * integral( I*dl x r(hat)/r^2) I just cant seem to get anywhere, any ideas?