There are 3 wires perpendicular to the page at three corners of a square with side length a = 3.3 cm as arranged above. Wire A has a current IA = 27 A going into the page. Wire B has a current IB = 92 A going out of the page. Wire C has a current IC = 28 A going out of the page. What is the magnitude of magnetic field in units of 10−4 T?