阿摩線上測驗
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阿摩線上測驗
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Figure (e) a coaxial transmission line with signal carrying conductor of radius a inside the surrounding ground of radius b. The inductance per unit length is
. Here we have assumed that the curent inside the signal-carrying conductor is uniformly distributed. And, the capacitance per unit length is 
.b. (5%) The characteristic impedance is defined as
, find out the characteristics impedance at high frequencies, and please indicate the unit for it. 新告+