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The characteristic impedance of a cable of length 1m is 50Ω. What is the characteristic impedance of the same cable of length 100m?

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The characteristic impedance of a cable of length 1m is 50Ω. What is the characteristic impedance of the same cable of length 100m?

(a) 100Ω

(b) 50Ω

(c) 25Ω

(d) 0.1Ω

This question was addressed to me by my college director while I was bunking the class.

My question comes from Transmission Line Basics topic in portion Transmission Lines of Avionics

1 Answer

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The correct option is (b) 50Ω

To explain I would say: The characteristic impedance of a cable is independent of length. Thus for 1m or 100m the characteristic impedance is 50Ω.

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