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Homework Help: RLC circuit

  1. Nov 30, 2011 #1
    1. The problem statement, all variables and given/known data
    The circuit parameters are: R = 60 Ohms, L = 5 mH, C = 40 microFarads, and e= 120 V. Initially the switch has been closed for a long time. At t=0 the switch is opened.

    What is t1, the first time greater than or equal to 0, that the current through the inductor is equal to zero?

    b)t1=2.11 ms
    c)t1=0.70 ms

    2. Relevant equations

    3. The attempt at a solution

    I really have no idea how to go about this question. Can someone help please?
  2. jcsd
  3. Nov 30, 2011 #2

    rude man

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    Gold Member

    EDIT: if you read what I wrote about arcing - it was wrong. There would be no arcing in this case. It's a very simple situation.

    Except for the part about the description of the circuit. It didn't specify the configuration. Had it said "series RLC" that would have been different. I am still assuming that's what's intended.
    Last edited: Nov 30, 2011
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