Question

The capacitance per unit length and the characteristic impedance of a lossless transmission line are C and Z respectively. The velocity of a travelling wave on the transmission line is

(a) ZC

(b) 1/ZC

(c) Z/C

(d) C/Z

The question was asked during an online interview.

This key question is from Advanced and Tricky Questions in portion Advanced and Tricky Questions of Electromagnetic Theory

Answer 1

Right choice is (b) 1/ZC

Easy explanation: The characteristic impedance of the Z = √(L/C) and the velocity of propagation is V = 1/√(LC). Thus we get V = 1/ZC.