# A charged capacitor is being discharged through a resistor.? A charged capacitor is being discharged through a resistor. At the end of one time constant the charge has been reduced by (1 – 1/e) =...

A charged capacitor is being discharged through a resistor.?

A charged capacitor is being discharged through a resistor. At the end of one time constant the charge has been reduced by (1 – 1/e) = 63% of its initial value. At the end of two time constants the charge has been reduced by what percent of its initial value?

A) 82%
B) 86%
C) 100%
D) Between 90% and 100%
E) need to know more data to answer the question.

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When a capacitor having capacitance `C`, charged initially at the maximum voltage `U_0` discharges through a resistor `R` the law that gives the variation of capacitor voltage with time is

`U(t) =U_0*e^(-t/tau)`  where `tau...

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