Topic: Electronics Engineering
The $y_{21}$ parameter of the network shown in the given figure will be
- A. $1/6$
- B. $-1/2$
- C. $-1/3$
- D. $1/3$
Answer: B. $-1/2$
Explanation: Convert star to delta. The equivalent delta network has a $6~\Omega$ resistor in parallel with the top $3~\Omega$ resistor. This reduces to a $\pi$-network. So $Y_{12} = -\frac{1}{2}$ mho.