Figure ??a?? shows, in cross section, three current carrying wires that are long, straight, and parallel to one another. Wires 1 and 2 are fixed in place on an x axis, with separation d. Wire t has a current of 0.750 A, but the direction of the current is not given. Wire 3, with a current of 0.250 A out of the page, can be moved along the x axis to the right of wire 2. As wire 3 is moved, the magnitude of the net magnetic force F on wire 2 due to the currents in wires 1 and 3 changes. The y component of that force is F2y, and the value per unit length of wire 2 is F2y/L2. Figure ??b?? gives F2y/L2 versus the position x of wire 3. The plot has an asymptote F2y/L2 = 0.627μN/m as x????. The horizontal scale is set by x s = 12.0 cm. What are the

(a) Size and

(b) Direction (into or out of the page) of the current in wire 2?

1.0 0.5 -0.5 x (cm) (a) (6) F/L2 (N/m)