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  4. Four metallic plates each with a surface area of one side A are placed at a distance d from each other. The plates are connected as shown in the circuit diagram. Then the capacitance of the system between a and b is

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Q. Four metallic plates each with a surface area of one side $A$ are placed at a distance $d$ from each other. The plates are connected as shown in the circuit diagram. Then the capacitance of the system between $a$ and $b$ isPhysics Question Image

Electrostatic Potential and Capacitance

Solution:

The given circuit can be redrawn as follows
image
$\Rightarrow C_{e q}=\frac{3 C}{2}=\frac{3 \varepsilon_{0} A}{2 d}$