VA HW19-F15 (CH21) c Chegg Study Guided C https:// t/web/Student/Assignment-Resp

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VA HW19-F15 (CH21) c Chegg Study Guided C https:// t/web/Student/Assignment-Responses/submit?dep 12030253 www.webassign.ne 6. 117 points Previous Answers MI4 21.4.017 My Notes You may have seen a coax al cable connected to a television set. As shown in the figure below a coaxial cable consists of a central copper wire of radius ri surrounded by a hollow copper tube (typically made of braided copper wire) of inner radius r2 and outer radius ra. Normally the space between the central wire and the outer tube is filled with an insulator, but in this problem assume for simplicity that this space is filled with air. Assume that no current runs in the cable Suppose that a coaxial cable is straight and has a very long length L, and that the central wire carries a charge +Quniformly distributed along the wire (so that the charge per unit length is +Q/L everywhere along the wire). Also suppose that the outer tube carries a charge -Q uniformly distributed along its length L. The cylindrical symmetry of the situation indicates that the electric field must point radially outward or radially inward. The electric field cannot have any component parallel to the cable. In this problem, draw mathematical Gaussian cylinders of length d (with d much less than the cable length L) and appropriate radius r, centered on the central wire (a) Use a mathematical Gaussian cylinder located inside the central wire (r r) and another Gaussian cylinder with a radius in the interior of the outer tube (re

Explanation / Answer

1) q = 0;

3) q = 0;

4) q = 0;

5) q = -Q;

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