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The characteristic impedance of a line having open and short impedances of 20 and 5 respectively is(a) 20(b) 100(c) 25(d) 10The question was asked in my homework.This is a very interesting question from Transmission Lines in division Transmission Lines of Electromagnetic Theory

Answer»

The correct option is (d) 10

The explanation: The characteristic impedance is the geometric mean of the short and OPEN circuit impedance. It is given by Zo^2 = Zsc Zoc. On SUBSTITUTING Zoc = 20 and Zsc = 5, we get Zo^2 = 20 X 5 = 100. THUS Zo = 10 OHM.



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