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Homework Help: RLC in an AC circuit

  1. Aug 20, 2010 #1
    1. The problem statement, all variables and given/known data
    For which of the following AC circuits does impedance depend on frequency? A circuit with
    Check all that apply.
    a resistor and inductor.
    a resistor and capacitor.
    only a resistor.



    2. Relevant equations



    3. The attempt at a solution
    I think that for a capacitor and inductor the frequency would change the impedance but im not sure?????????
    thanks for any help.
     
  2. jcsd
  3. Aug 20, 2010 #2

    rl.bhat

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    Homework Helper

    Impedance of the resistance only does not depend on the frequency.
     
  4. Aug 20, 2010 #3
    so I was right----- thanks--slightly off topic but I have another question
    "A circular wire loop of wire has radius 2.3cm and resistance 0.045ohms . A magnetic field is perpendicular to the loop.
    At what rate must the field change in order to induce a current of 1.4mA in the loop"
    ie. magnetic field/change in time?

    I have been searching my text book and cant find a formula thats relevant.
    Would really appreciate some help.
     
  5. Aug 20, 2010 #4

    rl.bhat

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    Homework Helper

    Magnetic flux φ = EA, where E is electric field and A is the area of ring.

    dφ/dt = A*dE/dt = V = IR.
     
  6. Aug 20, 2010 #5
    Thanls a lot rl.bhat
     
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