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A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in Figure (a) to determine the current i within the circle. Figure (b) shows current i as a function of r2. The vertical scale is set by is = 4.9 mA, and the horizontal scale is set by rs2 = 5.0 mm2. (a) Is the current density uniform? (b) If so, what is its magnitude? (a) (b) Number Units

A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in Figure (a) to determine the current i within the circle. Figure (b) shows current i as a function of r2. The vertical scale is set by is = 4.9 mA, and the horizontal scale is set by rs2 = 5.0 mm2. (a) Is the current density uniform? (b) If so, what is its magnitude? (a) (b) Number Units

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A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in Figure (a) to determine the current i within the circle. Figure (b) shows current i as a function of r 2 . The vertical scale is set by i s = 4.9 m A , and the horizontal scale is set by r s 2 = 5.0 m m 2 . (a) Is the current density uniform? (b) If so, what is its magnitude? (a) (b) (a) ◻ (b) Number i ! Units ◻

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