1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Charge on a capacitor in a series

  1. Feb 11, 2015 #1
    1. The problem statement, all variables and given/known data

    103szyq.png

    A circuit is constructed with five capacitors and a battery as shown. The values for the capacitors are: C1 = C5 = 3.9 μF, C2 = 3.9 μF, C3 = 5.7 μF, and C4 = 4.2 μF. The battery voltage is V = 12 V.

    What is Q5, the charge on capacitor C5?

    2. Relevant equations
    C=Q/V

    3. The attempt at a solution
    Okay, I thought that voltage across series capacitors was all the same across each one. Treating the parallel system as one capacitor of equivalent capacitance, I thought you could just divide the voltage by 3, and then multiply by C5 to get the charge on C5. I tried this and the answer is wrong. I'm really confused.
     
  2. jcsd
  3. Feb 11, 2015 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    The voltage across capacitors in series is not the same, unless the capacitances are equal. What is the resultant of C2, C3 and C4? Is it equal to 3.9 μF?
    I think you mix charge with voltage. The charge is same on series capacitors .
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Charge on a capacitor in a series
Loading...