Multiple choice

A coaxial cable with an inner diameter of 1 mm and outer diameter of 2.4 mm if filled with a dielectric of relative permittivity 10.89. Given $\mu_0 = 4\pi\times10^{-7}$H/m, $\epsilon_0$= $\dfrac{10^-9}{36 \pi}$F/m, the characteristic impedance of the cable is

  1. 330 $\Omega$
  2. 100 $\Omega$
  3. 143.3 $\Omega$
  4. 43.4$\Omega$
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