Can someone explain this rc circuit prob

[christianerik]

For a long period of time the switch S is
in position “b”. At t = 0 s, the switch S is
moved from position “b” to position “a”.

....3 M ohm
l---------------^^^^^^-----------------l
l........…......l
l...1 M ohm...4micro F.....l b
l---^^^^^^^^^-------------ll---------/ i
l........…......l
l.....16 V ........l a
l------------------l i-----------------------l


Find the voltage across the 1 M
center left resistor at time t1 = 4 s. Answer in units
of V.

 

[kuruman]

Sorry, but you need to supply a better diagram. What you have may look OK on your screen, but it is unintelligible on my screen.