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A resistor of 5 kilo-ohms is connected in series to a capacitor which are connected to...

A resistor of 5 kilo-ohms is connected in series to a capacitor which are connected to a 9 volt battery. After some time, the charge in the capacitor is 10 micro-coulombs. The battery is disconnected and 26 milli-seconds after the battery has been disconnected, the charge in the capacitor is 3.7 micro-coulombs. What is the value of the capacitor in micro-farads?

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