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LC circuit oscillations

  1. Apr 11, 2008 #1
    A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery. The period of the electromagnetic oscillations in the circuit is



    1. 0.0227 s.

    2. 1750 s.

    3. 105 s.

    4. 2.26 s.

    5. 0.376 s.


    f= 1/ 2*π *√L *C

    L =100mH
    C= 36uF

    so,,f = 2.65

    T = 1/f = 0.376S Is this correct????

    Thanks in advance!
     
  2. jcsd
  3. Apr 11, 2008 #2
    I don't think the correct answer is there at all. The correct equation for the frequency
    is: [tex] f = \frac {1} {2 \pi \sqrt{L C}} [/tex].
    if you type it in ascii you should type f = 1 / (2 * pi * √(L*C)) to prevent misunderstanding. If I substitute L = 0.1 H and C = 36 * 10^(-6) F, I get f = 83.9 Hz and T = 0.0119 s
     
  4. Apr 12, 2008 #3

    alphysicist

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    Homework Helper

    In the original problem statement you have that the capacitance is 36 milliFarads, but later in your post you state that the capacitance is 36 microFarads. If the capacitance is 36 mF, then I believe your answer is correct.
     
  5. Apr 12, 2008 #4
    I apologize the the m in the mF for 36mF is the greek letter Mu (10E-6). With that said is my answer correct?
     
  6. Apr 12, 2008 #5
    WAIT!!! IT IS 36mF.. The m is not Mu!!!
     
  7. Apr 12, 2008 #6
    may I ask what causes this electromagnetic oscilliation? never heard of it before...
     
  8. Apr 12, 2008 #7
    Well, you had listed it as uF at the very bottom, not mF.

    An alternating voltage source causes the oscillation.
     
    Last edited: Apr 12, 2008
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