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(C) The system consists of four parallel metal plates. Let the plates be numbered $1, 2, 3,$ and $4$ from top to bottom. Plate $1$ and $4$ are connect

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$\frac{2{\varepsilon _0}A}{d}$

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(C) The system consists of four parallel metal plates. Let the plates be numbered $1, 2, 3,$ and $4$ from top to bottom. Plate $1$ and $4$ are connected to terminal $B$,while plates $2$ and $3$ are connected to terminal $A$. This arrangement forms two capacitors in parallel,each with plate area $A$ and separation $d$. The capacitance of each capacitor is $C = \frac{{\varepsilon _0}A}{d}$. Since they are connected in parallel,the equivalent capacitance is $C_{eq} = C + C = 2\frac{{\varepsilon _0}A}{d}$.

What is the equivalent capacitance between points $A$ and $B$ in the given system?

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