Charge on 4 capacitors in parallel then series

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Homework Help Overview

The discussion revolves around determining the charge on four capacitors arranged in a combination of parallel and series configurations. The original poster provides initial charge values for the capacitors when a switch is open and seeks to understand the behavior of voltage and charge when the switch is closed.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the approach of calculating equivalent capacitance (Ceq) and the implications of voltage being the same across parallel capacitors. Questions arise regarding the behavior of voltage and charge in both series and parallel arrangements.

Discussion Status

Some participants are attempting to clarify the setup and calculations, while others suggest visual aids, like diagrams, to enhance understanding. There is an ongoing exploration of how to apply the voltage supply across the series combination of the equivalent capacitors.

Contextual Notes

There is a mention of specific charge values for the capacitors when the switch is open, but the implications of these values when the switch is closed are not fully resolved. The discussion also reflects on the need for clearer representations of the circuit configuration.

neshepard
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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.
 
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A diagram would go a long way to making the question clear.
 
Trying to figure how to add on.
 

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neshepard said:
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.
 

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