A 2-port network is shown in the figure. The parameter $h_{21}$ for this network can be given by

-1/2

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+1/2

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-3/2

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+3/2

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Solution

The correct option is A -1/2
$I_{2} = h_{21} I_{1} + h_{22} V_{2}$

$h_{21} = \begin{matrix} \frac{I_{2}}{I_{1}} \end{matrix} ∣ ∣ ∣ V_{2} = 0$

when $V_{2} = 0,$

$V_{1} - I_{1} R - (I_{1} + I_{2}) R = 0$

$I_{2}$ = $- \frac{I_{1}}{2}$

$\Rightarrow$ $\frac{I_{2}}{I_{1}}$ = $- \frac{1}{2}$

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