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Q.

Four plates of the same area of cross-section are joined as shown in figure.  The distance between each plate is ‘d’.  The equivalent capacity across A and B will be 

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a

30A2d

b

0Ad

c

30Ad

d

20Ad

answer is B.

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Detailed Solution

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The given capacitor is equivalent to 3 capacitors in parallel

Cp=3C

Cp=3ε0Ad

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