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# Figure 30-67a shows, in cross section, two wires that are

## Problem 70 Chapter 30

Fundamentals of Physics | 10th Edition

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Problem 70

Figure 30-67a shows, in cross section, two wires that are straight, parallel, and very long. The ratio i1/i2 of the current carried by wire 1 to that carried by wire 2 is 1/3. 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 uB set up by the two currents at the origin. Figure 30-67b gives uB as a function of the position x of wire 2. The curve has an asymptote of uB ! 1.96 nJ/m3 as , and the horizontal axis scale is set by xs ! 60.0 cm. What is the value of (a) i1 and (b) i2?

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