Charge on 4 capacitors in parallel then series

[neshepard]

Homework Statement

C. What is the charge on each of the four capacitors if switch S is closed? I have the charges if the switch is open, C1 and C2 are 8μC and C3 and C4 are 6μC since charges are same on series.

Homework Equations

The Attempt at a Solution

I know to find Ceq and work backwards, and that voltage in parallel is the same. But what happens to the volatage's and charges in both a series and parallel layout?
C1 and C3 are parallel Ceq=4μF
C2 and C4 are parallel Ceq=6μF
Each parallel group is in series.

 

[gneill]

A diagram would go a long way to making the question clear.

 

[neshepard]

Trying to figure how to add on.

 

[gneill]

I know to find Ceq and work backwards, and that voltage in parallel is the same. But what happens to the volatage's and charges in both a series and parallel layout?
C1 and C3 are parallel Ceq=4μF
C2 and C4 are parallel Ceq=6μF
Each parallel group is in series.

Call C1 in parallel with C3 "C13". Similarly "C24" is C2 in parallel with C4.
Now, C13 = 4μF and C24 = 6μF, as you've calculated above.

The first thing to do is determine how the 12V supply voltage will divide over the series combination of C13 and C24.