Combination of four parallel plate air capacitors is shown in figure. Separation between the plate P_1 & P_2 is d/3 and separation between the plates…

Combination of four parallel plate air capacitors is shown in figure. Separation between the plate $\displaystyle \mathrm{P}_1 \& \mathrm{P}_2$ is $\displaystyle \frac{d}{3}$ and separation between the plates $\displaystyle \mathrm{P}_2$ and $\displaystyle \mathrm{P}_3$ is d. The equivalent capacitance of the configuration is \_\_\_\_ $\displaystyle \mu \mathrm{F}$. (Given $\displaystyle \frac{\epsilon_0 \mathrm{~A}}{d}=4 \mu \mathrm{~F}$. Where $\displaystyle \mathrm{A}=$ Area of plates)