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A parallel plate capacitor has 91 plates, all are identical and arranged with same spacing between
them. If the capacitance 'between adjacent plates is 3 pF. What will be the resultant capacitance?

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273 pF

30 pF

94 pF

270 pF

answer is D.

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Detailed Solution

There are 91 plates forming 90 capacitors.
All the capacitors are connected in parallel, then the equivalent capacitance is

$C_{eq} = (90) C = (90) (3 pF) = 270 pF$

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