Figure shows, in cross section, several conductors that carry currents through the plane of the figure. The

Question:

Figure shows, in cross section, several conductors that carry currents through the plane of the figure. The currents have the magnitudes I1 = 4.0 A, I2 = 6.0 A, and I3 = 2.0 A, and the directions shown. Four paths, labeled a through d, are shown. What is the line integral ф B. d1 for each path? Each integral involves going around the path in the counterclockwise direction. Explain your answers.