1. The problem statement, all variables and given/known data A square loop of wire of side length L lies in the xy-plane, with its center at the origin and its sides parallel to the x- and y- axes. It carries a current i, in a counterclockwise direction, as viewed looking down the z-axis from the positive direction. The loop is in a magnetic field given by B = (B0/a)(zx-hat + xz-hat), where B0 is a constant field strength, a is a constant with the dimension of length, and x-hat and z-hat are unit vectors in the positive x-direction and positive z-direction. Calculate the net force on the loop. 2. Relevant equations F = iL x B 3. The attempt at a solution What's throwing me off is the zx-hat + xz-hat. I'm not sure how to figure this out. When I tried to solve the problem, though, everything cancelled out because the current on opposite sides of the square is flowing in opposite directions, so I got the force to be 0. However, I know this answer is not right. Any help would be appreciated.