Question: 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

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 = 4.0 mA, and the horizontal scale is set by r2s = 4.0 mm2.

(a) Is the current density uniform?

(b) If so, what is itsmagnitude?

(a) (mm) (b) i (mA)

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