An RC-circuit has a time constant of 6x10-3 seconds.
The capacitor stores a maximum energy of 8 J, when charged using a 3-Volt battery.
Using the same battery, we want to increase tenfold the amount of stored energy, while keeping the same time constant (to ensure that the charge and discharge of the capacitor occur in reasonable amounts of time).
To accomplish this, both the capacitor and resistor must be replaced.
Calculate the value of the resistance of the new resistor.