A capacitor of capacitance 100 mu F disc...

A capacitor of capacitance `100 mu F` discharges through a resistor R. At the same time a radioactive substances decays with mean life 30 ms. If ratio of charge on capacitor and activity of substance does not change with time then find R.

`300 Omega`

`100 Omega`

`200 Omega`

`400 Omega`

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