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A charged capacitor of capacitance C is ...

A charged capacitor of capacitance `C` is discharged through a resistance `R.A`. Radiacvtive sample decays with an average life `tau`. Find the value of `R` for which the ratio of the electrostatic field energy stored in the capacitor to the activity of the radioactive sample is independent of time.

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The correct Answer is:
`2tau//C`
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