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An RC- circuit, with R = 600kOmega and C...

An `RC-` circuit, with `R = 600kOmega` and `C = 10muF`, is connected to a `5.0-V` battery unit the capacitor is fully charged. Then, the battery is suddenly replaced with a new `3.00-V` battery of opposite polarity. At what time after this replacement will the energy stored in the capacitor be zero ? (given that `e ~~ (8)/(3)` )

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The correct Answer is:
`00006.00`
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