th) Figure 13-2 Magnetic field near a current-carrying wire situated in a uniform magnetic field. (a) Lines of B for a current perpendicular to the paper. (b) Lines of B for a uniform field parallel to the paper. (c) Superposition of fields in(a) and (b) and the resulting magnetic force F. The wire carries a current of 10 amperes, the uniform field has a B of 2 x 10"tesla, and the point where the lines of B are broken is at 10 millimeters from the center of the wire