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It closes at time t = 0 seconds and opens again at time t = 50 milliseconds. (a) Determine the currents I1, I2 and I3:

In the circuit (see attachment), S1 is an electronically-controlled switch. It closes at time t = 0 seconds and opens again at time t = 50 milliseconds.
(a)
Determine the currents I1, I2 and I3:
(i)
Under steady-state conditions (after '5 time constants')
(ii)
At the instant the switch is first closed
(iii)
5 milliseconds after the switch re-opens
(b)
Determine the time constants for the circuit for when the switch is open and for when it is closed.
(c)
Draw to scale and on common time axis waveforms of the three currents over a time of 0 to 80 milliseconds.
*** A sketch will be fine for this - it is only for comparison with my own graph ***
The diagram referenced in this question has been attached.
I've also attached this problem as a Word document to allow super/subscripts.

This question was asked on Apr 26, 2010.

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