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A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in part (a) of the figure below to determine the...

A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in part (a) of the figure below to determine the current i within the circle. Part (b) of the figure shows current i as a function of r2. The vertical scale is set by is = 2.0 mA, and the horizontal scale is set by r2s = 3.6 mm2

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