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  4. Three plates of common surface area A are connected as shown in figure. The effective capacitance will be

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Q. Three plates of common surface area $A$ are connected as shown in figure. The effective capacitance will bePhysics Question Image

NEETNEET 2022

Solution:

The given circuit is equivalent to parallel combination of two identical capacitors.
image
Each having capacitance, $C=\frac{\varepsilon_0 A}{d}$
Thus, $C_{e q}=2 C=\frac{2 \varepsilon_0 A}{d}$