Solved: Figure 32-34a shows the current i that is produced

Chapter , Problem 28

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Figure 32-34a shows the current i that is produced in a wire of resistivity 1.62 X 10-8 f1 . m. The magnitude of the current versus time t is shown in Fig. 32-34b. The vertical axis scale is set by is = 10.0 A, and the horizontal axis scale is set by ts = 50.0 ms. Point P is at radial distance 9.00 mm from the wire's center. Determine the magnitude of the magnetic field Bi at point P due to the actual current i in the wire at (a) t = 20 ms, (b) t = 40 ms, and (c) t = 60 ms. Next, assume that the electric field driving the current is confined to the wire. Then determine the magnitude of the magnetic field Bid at point P due to the displacement current i" in the wire at (d) t = 20 ms, (e) t = 40 ms, and (f) t = 60 ms. At point P at t = 20 s, what is the direction (into or out of the page) of (g) Bi and (h) Bid?