At t=0s, switch is moved to position 1 and the time constant= 1ms
At t=10ms, switch is moved to position 2, it is assumed there is no leakage current
At t=20ms, switch is moved to position 3 and the time constant is 1.5ms
The waveforms of position 1 and 3:
So I understand what's going on before 10ms but what's confusing me is after it, so if the time constant after 10ms(position 3) is 1.5ms then after five time constant where the capacitor is supposed to be fully discharged then must be at 1.5x5 = 17.5ms but on the waveform it looks like it's saying after five time constant, the capacitor is fully discharged at 22.5ms, so what's going on ?