Question

Four identical metal plates are located in air at equal distance $d$ from one another as shown in figure. The area of each plate is equal to $A$. Find the capacitance of the system between points $A$ and $B$.

Answer 1

$C_{eq}=C+\frac{C}{2}=\frac{3C}{2}=\frac{3{ϵ}_{o}A}{2d}$