Seven identical plates each of area $A$ and successive separation $d$ are arranged as shown in the figure. The effective capacitance of the system between $P$ and $Q$ is
- A$\frac{7 \varepsilon_0 A}{d}$
- B$\frac{6 \varepsilon_0 A}{d}$
- C$\frac{5 \varepsilon_0 A}{d}$
- D$\frac{3 \varepsilon_0 A}{d}$
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