2. In the left figure below, wire 1 consists of a circular arc and two radial lengths; it carries current I = 0.50 A in the direction indicated. Wire 2, shown in cross section, is long, straight, and perpendicular to the plane of the figure. Its distance from the center of the arc is equal to the radius R of the arc, and it carries a current I2 that can be varied. The two currents set up a net magnetic field B at the center of the arc. The graph gives the square of the field's magnitude, B², plotted versus the square of the current, I . Find the angle that is subtended by t+he arc

2. In the left figure below, wire 1 consists of a circular arc and two radial lengths; it carries current I = 0.50 A in the direction indicated. Wire 2, shown in cross section, is long, straight, and perpendicular to the plane of the figure. Its distance from the center of the arc is equal to the radius R of the arc, and it carries a current I2 that can be varied. The two currents set up a net magnetic field B at the center of the arc. The graph gives the square of the field's magnitude, B², plotted versus the square of the current, I . Find the angle that is subtended by t+he arc