A linear 2-port network is shown in Fig. (a). An ideal DC voltage source of 10 V is connected across Port 1. A variable resistance R is connected across Port 2. As R is varied, the measured voltage and current at Port 2 is shown in Fig. (b) as a V₂ versus $$-$$I₂ plot. Note that for V₂ = 5 V, I₂ = 0 mA, and for V₂ = 4 V, I₂ = $$-$$4 mA. When the variable resistance R at Port 2 is replaced by the load shown in Fig. (c), the current I₂ is ________ mA (rounded off to one decimal place).

The z-parameter matrix $$\begin{bmatrix}z_{11}&z_{12}\\z_{21}&z_{22}\end{bmatrix}$$ for the two-port network shown is

The ABCD parameters of the following 2-port network are

The equivalent resistance in the infinite ladder network shown in the figure, is$${R_e}$$

The value of $${R_e}/R$$ is _______________