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## Homework Statement

From the circuit diagram ( http://postimg.org/image/lldnr7mf7/ ) calculate the net charge flown through the capacitor 2.

## Homework Equations

3. The Attempt at a Solution [/B]

I actually don't need to solve the full problem as i understand how, what i have trouble with is the first part. Below the circuit diagram there is a transformation diagram where i suppose we eliminated every generator that stays the same throughout the changes in the circuit. (In the text we first had switch open and then it closes. ##q1## is the flow thorough the capacitor 1 but lets not dwell on that.

My real questions are:

Where did ##R_6## go? That side is where the switch is so i guess that its disclusion has something to do with that but why exactly?

What exactly is the rule for getting ##R_a## and ##R_c## and why is ##R_B## exactly there?

I see that they are all calculated similarly, product of two resistors divided by the total sum of resistors and the resultant are connected in parallel, is that right? Is there a simpler diagram you can refer me to which uses this?