Example 8.4. Imagine a very long solenoid with radius R. n turns per unit length, and current I. Coaxial with the solenoid are two long cylindrical (non- conducting) shells of length 1-one, inside the solenoid at radius a, carries a charge +Q, uniformly distributed over its surface; the other, outside the solenoid at radius b, carries charge -Q (see Fig. 8.7; I is supposed to be much greater than b). When the current in the solenoid is gradually reduced, the cylinders begin to rotate, as we found in Ex. 7.8. Question: Where does the angular momentum come from? 14 +0 -0 FIGURE 8.7 b |2

Example 8.4. Imagine a very long solenoid with radius R. n turns per unit length, and current I. Coaxial with the solenoid are two long cylindrical (non- conducting) shells of length 1-one, inside the solenoid at radius a, carries a charge +Q, uniformly distributed over its surface; the other, outside the solenoid at radius b, carries charge -Q (see Fig. 8.7; I is supposed to be much greater than b). When the current in the solenoid is gradually reduced, the cylinders begin to rotate, as we found in Ex. 7.8. Question: Where does the angular momentum come from? 14 +0 -0 FIGURE 8.7 b |2

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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Concept explainers

Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.

Question

Example 8.4. Imagine a very long solenoid with radius R, n turns per unit
length, and current I. Coaxial with the solenoid are two long cylindrical (non-
conducting) shells of length 1-one, inside the solenoid at radius a, carries a
charge +Q, uniformly distributed over its surface; the other, outside the solenoid
at radius b, carries charge -Q (see Fig. 8.7; I is supposed to be much greater
than b). When the current in the solenoid is gradually reduced, the cylinders begin
to rotate, as we found in Ex. 7.8. Question: Where does the angular momentum
come from?
14
bl
FIGURE 8.7

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