Figure (0) shows two wires, each carrying a current. Wire 1 consists of a circular arc of radius R = 0.019 m and two radial lengths; it carries current i1 = 2.1 A in the direction indicated. Wire 2 is long and straight; it carries a current i2 that can be varied; and it is at > distance R/2 from the center of the arc. The net magnetic eld B clue to the two currents is measured at the center of curvature of ) the arc. Figure (b) is a plot of the component of B in the direction perpendicular to the gure as a function of current i2. The horizontal scale is set by i25 = 2.0 A. What is the angle subtended by the arc? % I- is (-A) (6) Number I Units v