# GATE Papers >> ECE >> 2019 >> Question No 14

Question No. 14

Consider the two-port resistive network shown in the figure. When an excitation of 5 V is applied across Port 1, and Port 2 is shorted, the current through the short circuit at Port 2 is measured to be 1 A (see (a) in the figure). .

Now, if an excitation of 5 V is applied across Port 2, and Port 1 is shorted (see (b) in the figure), what is the current through the short circuit at Port 1?

##### Answer : (B) 1 A

Solution of Question No 14 of GATE 2019 ECE Paper

Given 2 port network is a reciprocal network.

$\begin{array}{l}\frac{{\mathrm I}_1}{{\mathrm V}_1}=\frac{{\mathrm I}_2}{{\mathrm V}_2}\\\frac{1\mathrm A}{5\mathrm V}=\frac{{\mathrm I}_2}{5\mathrm V}\Rightarrow{\mathrm I}_2=1\mathrm A\end{array}$