Understanding Charge Transfer in C & 2C Circuit

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Homework Help Overview

The discussion revolves around a circuit involving capacitors with capacitances C and 2C, and inductors with inductances L and 2L. The original poster is exploring the relationship between the charge on the capacitors and the current flowing through them, specifically questioning the impact of both capacitors on the current i_1 when connected in a certain configuration.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to clarify their understanding of how the capacitors influence the current in the circuit. They express confusion regarding the interaction between the two capacitors and the current i_1. Other participants discuss the implications of a short circuit in the circuit configuration, suggesting that it creates isolated loops and questioning the effect on the currents.

Discussion Status

Participants are actively engaging with the conceptual aspects of the circuit. Some guidance has been offered regarding the behavior of the circuit when the switch is closed, with a focus on the isolation of loops created by the short circuit. However, there is no explicit consensus on the implications for the currents i_1 and i_2.

Contextual Notes

The original poster indicates that their actual homework problem differs from the current discussion, highlighting a need for conceptual clarity before proceeding with the assigned task.

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Homework Statement


upload_2015-1-2_19-52-17.png
[/B]
C and 2C represent the capacitance of the respective capacitors. L and 2L represent the inductance of the respective inductors. Let, the charge on the capacitors GM and PM be q_1 and q_2 which are variable. t represents time. Initially (when the switch k was closed and t = 0) , q_1 = \frac{2q_0}{3} ; q_2 = \frac{q_0}{3}. Would it be,
i_1 = - \frac{dq_1}{dt} ; i_2 = - \frac{dq_2}{dt} ?
Explain your answer.

Homework Equations


That is conceptual question. No equation is needed.

The Attempt at a Solution


The actual homework was different. But I need to clear my concept before solving the actual problem. My confusion is, the MGHJ segment (which has the current i_1) is connected with both the capacitors. So, won't both the capacitor affect the current i_1 ?
 
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The short circuit between M and J when the switch is closed effectively creates two isolated loops as no potential can develop across the short. In other words, M and J become a single node. No current from either loop can stray into the other loop past that short circuit.
 
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gneill said:
The short circuit between M and J when the switch is closed effectively creates two isolated loops as no potential can develop across the short. In other words, M and J become a single node. No current from either loop can stray into the other loop past that short circuit.
So, if I change the circuit into the following , I think i_1 and i_2 won't change. Am I right?
upload_2015-1-2_21-11-15.png
 
Right.
 
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