A material is described by the following electrical parameters at a frequency of
10GHz:\sigma=10^6mho/mand \mu=\mu_0\;and\;\in/\in_0=-10
The material at this frequency is considered to be (\in_0=\frac1{36\pi}\times10^{-9}F/m)
(a) a good conductor
(b) a good dielectric
(c) neither a good conductor, nor a good dielectric
(d) a good magnetic material
Ans : a)
Explanation
Let us find the value of loss tangent.
\frac\sigma{\omega\in}=\frac{10^6}{2\pi\left(10\times10^9\right)\left(8.854\times10^{-12}\times10\right)} \frac\sigma{\omega\in}=1.798\times10^5>>1So, it is a good conductor as loss tangent is very much greater than 1.
