Item 6 Four very long, current-carrying wires in the same plane intersect to form a square with side lengths of 47.0cm, as shown in the figure (Figure 1) . The currents running through the wires are 8.0 A, 20.0 A, 10.0 A, and I. Part A Find the magnitude of the current I that will make the magnetic field at the center of the square equal to zero. Express your answer in amperes. I= A Part B What is the direction of the current I? upward downward