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Homework Help: How to solve RLC Circuit

  1. Sep 9, 2009 #1
    1. The switch in the circuit shown in Figure has been closed for a long time
    before t = 0 but opened at t = 0. Solve for i(t) for t ≥ 0.

    *Hereby I attached the circuit diagram for the question above.

    And this is where I got so far.
    = 4 Neper.
    But then I don't know how to solve for the rest.

    Attached Files:

    Last edited: Sep 9, 2009
  2. jcsd
  3. Sep 11, 2009 #2


    User Avatar

    We don't do homework for you. You must show some effort in order to get some help.
    What were the current in the inductor and the voltage at the capacitor before the opening of the key. These are the initial conditions for your circuit.
    Write the mesh equation for the circuit after the opening. You will have a second order differential equation.
    Solve the differential equation and substitute the initial conditions.
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