A capacitor is made of a flat plate of area A and a second plate having a stair-like structure as shown in figure. If the area of each stair is $\frac{A}{3}$ and the height is $d$ , the capacitance of the arrangement is :

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All capacitor are in parallel combination. Also effective area is common area only ​ ⇒ C eq ​ = C 1 ​ + C 2 ​ + C 3 ​ ⇒ C eq ​ = 3 d A ε 0 ​ ​ + 3 ( 2 d ) A ε 0 ​ ​ + 3 ( 3 d ) A ε 0 ​ ​ ⇒ C eq ​ = 3 A ε 0 ​ ​ ( 6 d 11 ​ ) ⇒ C eq ​ = 18 d 11 A ε 0 ​ ​ ​

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