Question

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(b)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 ?

• A. 0.5 A
• B. 2.5 A
• C. 1 A
• D. 2 A

Answer 1

The correct option is C 1 A

According to reciprocity theorem,

In a linear bilateral single source network the ratio of response to excitation remains the same even after their positions get interchanged.

$\therefore \frac{I}{5}=\frac{1}{5}\Rightarrow I=1A$