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A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in Fig. 26-24a to determine the current i within the circle. Figure 26-24b shows current i as a function of r2. The vertical scale is set by is = 4.0 mA, and the horizontal scale is set by r2s = 4.0 mm2. (a) Is the current density uniform? (b) If so, what is its magnitude?
Figure 26-24 Problem 6.
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