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A little circuit reduction question

  1. Oct 17, 2013 #1
    1. The problem statement, all variables and given/known data
    The attached file has a circuit reduction which I can understand all but the missing capacitance C between B' and C' to the ground each from figure (a) in figure (b)


    2. Relevant equations
    N/A

    3. The attempt at a solution
    Shouldn't there be another capacitance of 2C in the bottom line of figure (b)?
     

    Attached Files:

  2. jcsd
  3. Oct 17, 2013 #2

    gneill

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    Staff: Mentor

    Looks like the voltage sources have been suppressed (Thevenin?). Thus B' and C' both are grounded through the shorted supplies. Both ends of those two caps are thus grounded... and they disappear in a puff of logic :smile:
     
  4. Oct 17, 2013 #3
    oh wow. i feel a little embarrassed now but never thought i would make that out in my head. thanks so much!
     
  5. Oct 17, 2013 #4

    gneill

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    Staff: Mentor

    No problem. Glad to help.
     
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