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The capacitance per unit length and the characteristic impedance of a lossless transmission line are $\mathrm{C}$ and $\mathrm{Zo}$ respectively. The velocity of a travelling wave on the transmission line

1. $Z_{0} C$
2. $\frac{1}{\mathrm{Z}_{\mathrm{o}} \mathrm{C}}$
3. $\frac{Z_{0}}{C}$
4. $\frac{\mathrm{C}}{\mathrm{Z}_{0}}$