Seven capacitors, each of the capacitance $2\,\mu F$, are to be connected in a configuration to obtain an effective capacitance of $\left( {\frac{6}{{13}}} \right)\,\mu F$. Which of the combinations, shown in figures below, will achieve the desired value ?
JEE MAIN 2019, Diffcult
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$C_{e q}=\frac{6}{13}\, \mu F$
Therefore three capacitors most be in parallel to get $6$ in $\frac{1}{C_{e q}}=\frac{1}{3 C}+\frac{1}{C}+\frac{1}{C}+\frac{1}{C}+\frac{1}{C}$
$C_{e q}=\frac{3 C}{13}=\frac{6}{13} \,\mu F$
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