A high-resistivity material is used as an insulator between the conductors of a

Question

A high-resistivity material is used as an insulator between the conductors of a length of coaxial cable. The highly-resistive material, which forms a hollow tube, has an inner radius a and an outer radius b, and provides a large resistance R between the inner and outer conductors of the coaxial cable. In a second coaxial cable, having the same length as the first, the highly-resistive material has inner radius 2a and outer radius 2b. In the second cable, what is the resistance between the two conductors? A.4R B.2R C.ln(2R) D.R E.R/(ln2)

Explanation / Answer

R

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