95 Figure 33-74 shows a cylindrical resistor of length l, radius a, and resis- tivity p, carrying current i. (a) Show that the Poynting vector S at the sur- face of the resistor is everywhere directed normal to the surface, as 3. shown. (b) Show that the rate P at which energy flows into the resistor through its cylindrical surface, calcu- lated by integrating the Poynting vector over this surface, is equal to the rate at which thermal energy is 3- produced: in where dA is an element of area on the cylindrical surface and R is the resistance. -2a-

95 Figure 33-74 shows a cylindrical resistor of length l, radius a, and resis- tivity p, carrying current i. (a) Show that the Poynting vector S at the sur- face of the resistor is everywhere directed normal to the surface, as 3. shown. (b) Show that the rate P at which energy flows into the resistor through its cylindrical surface, calcu- lated by integrating the Poynting vector over this surface, is equal to the rate at which thermal energy is 3- produced: in where dA is an element of area on the cylindrical surface and R is the resistance. -2a-

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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