Solution to task 413 from Chertov´s for extramural stud

Solution to task 413 from Chertov´s for extramural stud

413. The square wire frame is located in the same plane with the long straight wire so that its two sides are parallel to the wire. The same currents flow through the frame and the wire with a force of I = 200 A. Determine the force F acting on the frame if the side of the frame closest to the wire is at a distance equal to its length from it.