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Question

All plates are of same area (A). Find effective capacitance between A & B


A
35ϵ0Ad
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B
53ϵ0Ad
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C
43ϵ0Ad
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D
4ϵ0Ad
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Solution

The correct option is B 53ϵ0Ad

(1,6,7) connected to "+ve"
(4,5) connected to "(-ve)"
(2,3,8) inter connected.

Since the area and distacne between all the plates are same, they all have the same value of capacitance C=ϵoAd

C78 parallel to C12 = 2C
2C is parallel to C12=23C
23C is parallel to C65=53C=53ϵoAd


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