Multiple choice

A coaxial cable is made of two brass conductors. The spacing between the conductors is filled with Teflon ($\epsilon$r = 2.1, tan $\delta$= 0). Which of the following circuits can represent the lumped element model of a small piece of this cable having length $\triangle$z?

  1.

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B Correct answer
Explanation

$\text{Given that} \\ tan \delta= 0 \\ tan \delta = \text{loss tangent} = \frac{\sigma}{\omega \epsilon} = o \\ \text{So}, \hspace{0.5cm} \sigma = 0 \\ \text{Hence, condustivity is} \\ G = 0$

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