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Homework Help: Finding voltage and current expressions (capacitance)

  1. Jul 12, 2012 #1
    1. The problem statement, all variables and given/known data

    The charge on a 2-microfarad capacitor is given by q(t)=10^-6 * sin(10^5*t) C find the dexpression for the voltage and current?

    2. Relevant equations

    3. The attempt at a solution
    the answer is v(t)=0.5sin(10^5t) , i(t)=0.1cos(10^5t) i dont get how they found the answer
  2. jcsd
  3. Jul 12, 2012 #2
    Note that q = Cv and i = [itex]\frac{dq}{dt}[/itex].
  4. Jul 12, 2012 #3
    what im confused is when they say, charge is microfarad does that mean q=2x10^-6 or is the capacitor 2 microfarad meaning c=2x10^-6
  5. Jul 13, 2012 #4


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    Staff: Mentor

    Capacitance is given in farads (microfarads in this case), while charge is given in coulombs (C).
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