Question

What is the total capacitance of the combination when $3$ capacitors each of capacitance $9 \,pF$ are connected in series?

• A. $3\,pF$
• B. $1/3\, pF$
• C. $4\,pF$
• D. $1/4\, pF$

Answer 1

Answer: (A)

$3\,pF$

Answer 2

$\frac{1}{C}=\frac{1}{9}+\frac{1}{9}+\frac{1}{9}=\frac{3}{9}$
$\Rightarrow C=3 pF$