Need help understanding voltage

Discussion in 'Homework Help' started by kyro1214, Oct 4, 2009.

  1. kyro1214

    Thread Starter New Member

    Oct 4, 2009
    2
    0
    Assume the charge at the upper terminal is zero at the instant the current is passing through its maximum value. find the expression for q(t).
    i = 24cos4000t A

    im not sure if i taken the correct integral of it. i got q(t) = (24cos4000t)1/2t^2

    also for the same question but when i=0 when t<0 and i=20e^-5000tA when t> or equal to 0.
     
  2. steinar96

    Active Member

    Apr 18, 2009
    239
    4
    Hmm, the integral of cos is sin. So the final function should have a sin in it. And also when you integrate cos(kt) where k is a constant you get sin(kt) divided by the stuff inside the cos function differentiated. That is

    sin(kt) / k.

    Try integrating again with this in mind.
     
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