申論題

4.For a coaxial transmission line shown in Fig. 2, the capacitance per unit length isand the inductance per unit length is. At high frequencies, the intemal inductance drops off (that is, approaching 0, and you should know which term is the internal inductance).

(4%) (d) Using the result from a), along with the per unit length external inductance found in c), write down the internal & external inductance for the conductor system shown in the Right of Fig. 3.

Fig. 3. A single conductor above a Ground (Left); A two-conductor system with currents flow in opposite direction (Right); the two conductors both with radius a and d distance apart.