Using a switch, we can set up a simple circuit that can easily charge and discharge a capacitor. One such circuit is shown in $($ Figure $1),$ where $C=160mF,R_1=55,R_2=90,$ and $R_3=60.$ Assume that the switch has been open for a long time $($so the capacitor starts with no charge$).$

We then open the switch. How much current flows through $R_1$ the moment we open the switch?

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Part E

How much current flows through $R_2$ the moment the switch is opened?

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Correct

Part F

After opening the switch, how long does it take for the capacitor to reach $20\%$ of its charge just before the switch was opened?

Figure

$1$ of $1$

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Answer PART F