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Q.

In the following figure, area of each plate is A and d is separation between adjacent plates in free space. The capacitance of system between A and B is x3(0.Ad)  if x is integer find    

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answer is 5.

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Detailed Solution

  Area and distance are constant for each capacitor, so capacitance also remain constant. 
Let it is C.
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The equivalent circuit can be drawn as
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Hence, equivalent capacitance is  CAB=(C+C)×C(C+C)+C+C=5C3

 

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