A capacitor is made of a flat plate of ...

A capacitor is made of a flat plate of area A and a second plate having s stair-like structure as shown in figure. The width of each stair is a and the height is d. Both plates have the same width perpendicular to plane of paper. Find the capacitance of the assembly.

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The correct Answer is:

`(8in_(0)A)/(15d)`

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