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Question

Net capacitance of three identical capacitors in series is 1 uF. What will be their net capacitance if connected in parallel
Find the ratio of energy stored in the two configurations if they are both connected to the same source.

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Solution

1CS=1C+1C+1C=3C
or C=3Cs = 3×1 uF= 3 uF
When these two combinations are connected to same source the potential net capacitance , cP=3C=3×3=9 uF
When these two combinations are connected to same source the potential difference across each combination is same.
Ratio of energy stored,
UsUp=12CsV212CpV2
Us:Up=1:9

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