Find the capacitance of C3 and its charge

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Homework Help Overview

The discussion revolves around finding the capacitance of a capacitor labeled C3 and determining its charge, with references to relevant equations and attempts at solutions.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the appropriate formula for voltage across a capacitor, questioning the original poster's use of a formula and suggesting the relationship V=Q/C. There is an exploration of whether this relationship is correctly applied in the context of the problem.

Discussion Status

Some participants have provided feedback on the original poster's attempts, indicating improvements in understanding. There is acknowledgment that the solution for part (b) may not depend on part (a), suggesting a potential simplification in the approach. Multiple interpretations of the problem are being explored.

Contextual Notes

There is a mention of needing to correct previous work, indicating that the original poster may have faced challenges in their initial attempts. The discussion also hints at the possibility of assumptions regarding the relationship between charge, voltage, and capacitance.

Kelsi_Jade
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Homework Statement


From the textbook:
upload_2017-3-27_9-20-2.png


Homework Equations

/ 3. The Attempt at a Solution
My attempt at the solution: looking to fix my issues and help correcting my work.[/B]
upload_2017-3-27_9-20-24.png

upload_2017-3-27_9-21-49.png
 
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You have used incorrect formula for voltage across capacitor.

You need to write the voltage across capacitor in terms of charge and capacitance.
 
Should be V=Q/C?
 
Kelsi_Jade said:
Should be V=Q/C?
Yes.
 
So, would this be accurate?

upload_2017-3-27_17-19-31.png
 
I think that's right for (a). Much better than before. :approve:

For (b) you don't actually need the answer to (a). You might be able to say it off back of head. :oldwink:

After which calculation of (a) is a bit simpler.

Here Matrices and determiants is how you can make pages like yours look better.
 
Last edited:

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