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## Homework Statement

A fully charged 10e-4 F capacitor has a potential difference across it of 9Volts. It is then connected to a resistor of 10 ohms. How long will it take for the current through the resistor to decrease to 1/2 of its initial value?

## Homework Equations

## The Attempt at a Solution

I know the answer is 6.9e-4 secs... but I want to know how it was done :/ Anyone?