Figure (a) shows, in cross section, two wires that are straight, parallel, and very long. The ratio i /iz of the current carried by wire 1 to that carried by wire 2 is 1/2. Wire 1 is fixed in place. Wire 2 can be moved along the positive side of the x axis so as to change the magnetic energy density ug set up by the two currents at the origin. Figure (b) gives ug as a function of the position x of wire 2. The curve has an asymptote of ug = 5.37 nJ/m³ as x→, and the horizontal axis scale is set by x, = 25.0 cm. What is the value of (a) i, and (b) i2? 2 (a) (b) x (cm) (a) i1 = i Ug (nJ/m³)

Figure (a) shows, in cross section, two wires that are straight, parallel, and very long. The ratio i /iz of the current carried by wire 1 to that carried by wire 2 is 1/2. Wire 1 is fixed in place. Wire 2 can be moved along the positive side of the x axis so as to change the magnetic energy density ug set up by the two currents at the origin. Figure (b) gives ug as a function of the position x of wire 2. The curve has an asymptote of ug = 5.37 nJ/m³ as x→, and the horizontal axis scale is set by x, = 25.0 cm. What is the value of (a) i, and (b) i2? 2 (a) (b) x (cm) (a) i1 = i Ug (nJ/m³)