The input impedance of a loss-less transmission line is

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The input impedance of a loss-less transmission line is 100 ohms when terminated in a short-circuit, and 64 ohms when terminated in an open circuit. The characteristic impedance of the line is—

1. 80 ohms
2. 164 ohms
3. 36 ohms
4. 64 ohms

Correct Option: A

Z₀ = √Z_in·Z_L = √100 × 64 = 80 ohm