EXAMPLE 27.3 The Radial Resistance of a Coaxial Cable Coaxial cables are used extensively for cable television and other

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Example 27 3 The Radial Resistance Of A Coaxial Cable Coaxial Cables Are Used Extensively For Cable Television And Other 1 (36.2 KiB) Viewed 34 times

EXAMPLE 27.3 The Radial Resistance of a Coaxial Cable Coaxial cables are used extensively for cable television and other electronic applications. A coaxial cable consists of two concentric cylindrical conductors. The region between the conductors is completely filled with polyethylene plas tic as shown in Figure 27.8a. Current leakage through the plastic, in the radial direction, is unwanted. (The cable is designed to conduct current along its length, but that is not the current being considered here.) The radius of the inner conductor is a 0.500 cm, the radius of the outer conductor is b= 1.75 cm, and the length is L= 15.0 cm., The resistivity of the plastic is 1.0 x 10¹3 -m. Calculate the resistance of the plastic between the two conductors. Polyethylene. Outer Inner conductor conductor (a) Current direction End view. (b) Figure 27.8 (Example 27,3) A coaxial cable. (a) Plastic fills the gap. between the two conduc tors. (b) End view, show- ing current leakage.