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$$
\begin{array}{l}{\text { For the system of }} \\ {\text { capacitors shown in Fig. E2 4.16, }} \\ {\text { find the equivalent capacitance }} \\ {\text { (a) between } b \text { and } c, \text { and }(b)} \\ {\text { between } a \text { and } c .}\end{array}
$$

 

 

 



 

 


(1) $$
C_{e q}=C_{23}=c_{2+C_{3}}
$$

$$
=11+9=20 \mathrm{pF}
$$

(2) $$
\frac{1}{c_{123}}=\frac{1}{c_{1}}+\frac{1}{c_{23}}
$$

$$
=C_{123}=C_{eq}=\frac{C_{1} C_{23}}{C_{1}+C_{23}}
$$


\(∴\quad=\frac{15+20}{15+20}=8.6 \mathrm{PF} \)

 

 

 

 

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