The figure below shows a series RC circuit so that the bottom plate of the capacitor has charge +21 μC (and the top plate has charge −21 μC) when the switch (S) is opened.

If the switch S is now closed, determine the moment in time (in msec) when the capacitor will be uncharged, given that: R = 2 kΩ, C = 3 μF and ε = 20 Volts.