7.31 The inner and outer conductors of a coaxial cable have radii of 0.5 cm and 1 cm, respectively. The conductors are made of copper with & = 1, H

= 1, and oThe outer conductor is 0.5 mm thick. At 10 MHz:= 5.8 × 10’ S/m. (a) Are the conductors thick enough to be considered infinitely thick as far as the flow of current through them is concerned?(b) Determine the surface resistance Rg.(c) Determine the ac resistance per unit length of the cable.