Question

A certain cylindrical wire carries current. what is its magnitude?

A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in figure 26-23a to determine thecurrent i within the circle. Figure 26-23b shows current i as a function of r2. Thevertical scale is set by is = 4.5 mA, and the horizontal scale is set by rs2 = 4.2mm2. (a) Is the current density uniform (1 denotes "yes", 0 – otherwise)? (b) If so, what is itsmagnitude?

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