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

AI Thread Summary
The discussion focuses on calculating the charge and potential drop across two capacitors in series connected to batteries. Participants highlight confusion regarding the application of Kirchhoff's laws, particularly in determining the correct signs for potential drops or rises across the capacitors. It is emphasized that the direction of current flow and the net voltage in the circuit are crucial for accurate calculations. The problem is clarified to not have multiple solutions, but the approach taken can lead to different results based on assumptions made. Understanding the steady state and current flow is essential for solving the problem effectively.
EddiePhys
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Homework Statement


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