a.  Determine the magnitude and direction of magnetic field at point a.

b.  Determine the magnitude and direction of magnetic field at point b.

The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, an outer conductor, and another rubber layer. In a particular application, the current in the inner conductor is I = 1.04 A out of the page and the current in the outer conductor is I = 2.98 A into the page. Assuming the distance d = 1.00 mm, answer the following.