Choosing a zero for potential for 2 batteries in parallel with capacitors

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Homework Help Overview

The discussion revolves around analyzing a circuit involving two batteries in parallel with capacitors. The original poster seeks to determine the charge and potential drop across each capacitor, noting confusion regarding the application of Kirchhoff's laws and the signs associated with potential changes across the capacitors.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the application of Kirchhoff's laws and the implications of potential drops or rises across the capacitors. There is a focus on the direction of current and the net voltage in the circuit, with some questioning whether the problem could have multiple solutions.

Discussion Status

The discussion is ongoing, with participants providing guidance on the application of Kirchhoff's laws and questioning assumptions about potential changes. There is no explicit consensus, but the conversation is exploring different interpretations and approaches to the problem.

Contextual Notes

Participants are considering the steady state of the circuit, where the current is zero, and are discussing how this affects the charging of the capacitors.

EddiePhys
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Homework Statement


I want to find the charge and potential drop across each capacitor
IMG_20170814_154644_01.jpg

Homework Equations

The Attempt at a Solution



I know both the capacitors are in series and hence have the same charge on them. However I don't know how to calculate the potential drop across the capacitors. Tried applying Kirchoff's laws, but I don't know whether there is a potential drop or rise across each capacitor so I don't know which sign to use. Different signs are giving different answers. Is it possible that this problem has multiple solutions?
 
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EddiePhys said:
Is it possible that this problem has multiple solutions?
No.
EddiePhys said:
Tried applying Kirchoff's laws, but I don't know whether there is a potential drop or rise across each capacitor so I don't know which sign to use. Different signs are giving different answers.
If you showed your working, we can see where you went wrong.
 
cnh1995 said:
No.

If you showed your working, we can see where you went wrong.

If you apply Kirchoff's laws, say in an anticlockwise manner, the answer will depend on whether you assume the potential to drop or rise across either one of the capacitors or rise/drop across both capacitors
 
EddiePhys said:
If you apply Kirchoff's laws, say in an anticlockwise manner, the answer will depend on whether you assume the potential to drop or rise across either one of the capacitors or rise/drop across both capacitors
What is the direction of current? What is the net voltage in the circuit?
 
cnh1995 said:
What is the direction of current? What is the net voltage in the circuit?
I want to solve this when it's in steady state so the current is zero
 
EddiePhys said:
I want to solve this when it's in steady state so the current is zero
Yes, but to charge the capacitors, how should the current flow?
 

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