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Find the capacitance of C3 and its charge

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  1. Mar 27, 2017 #1
    1. The problem statement, all variables and given/known data
    From the textbook:
    upload_2017-3-27_9-20-2.png

    2. Relevant equations / 3. The attempt at a solution
    My attempt at the solution: looking to fix my issues and help correcting my work.

    upload_2017-3-27_9-20-24.png
    upload_2017-3-27_9-21-49.png
     
  2. jcsd
  3. Mar 27, 2017 #2

    cnh1995

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    Homework Helper

    You have used incorrect formula for voltage across capacitor.

    You need to write the voltage across capacitor in terms of charge and capacitance.
     
  4. Mar 27, 2017 #3
    Should be V=Q/C?
     
  5. Mar 27, 2017 #4

    cnh1995

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    Homework Helper

    Yes.
     
  6. Mar 27, 2017 #5
    So, would this be accurate?

    upload_2017-3-27_17-19-31.png
     
  7. Mar 27, 2017 #6

    epenguin

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    Gold Member

    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: Mar 27, 2017
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