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Impedance in RLC Circuit

an uncharged ...

Question

an uncharged capacitor having capacitance C is connected across a battery of EMF v now the battery is disconnected and reconnected occurs same battery but with reverse polarity the ratio of total thermal energy produced to Total energy supplied by battery is

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Solution

See you are changing the polarity from E to -E so net change is 2E so use U=1/2C(2E)^2=2CE^2

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