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Homework Help: LC circuit with inductor problem

  1. Apr 21, 2010 #1
    1. The problem statement, all variables and given/known data
    An LC circuit with an inductor of 4 microH is used as tuner for an FM radio. The capacitance required to tune in to a radio stations of 100 MHz is most nearly what?

    2. Relevant equations
    w= 2pif = 1/sqrt LC

    3. The attempt at a solution

    I plugged in 4 microH into equation for f but I realized I have too many unknowns. I also tired 100 MHz for f but same problem. I am lost, please help!
  2. jcsd
  3. Apr 21, 2010 #2
    My advice is to figure out what quantity microH goes with and which quantity MHz goes with. They can't both be f unless microH and MHz are the same unit, which they aren't.
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