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Electrical charge on Capacitor

  1. Jan 15, 2014 #1
    1. The problem statement, all variables and given/known data

    A dc current of 3 A flows through an initially discharged capacitor.
    After 2 micro s what is the electrical charge on the capacitor?

    2. Relevant equations
    q(t)= integral i(t) dt between t=0 and t


    3. The attempt at a solution
    (3t^2)/2=6x10^-12 C. Is this right?
     
  2. jcsd
  3. Jan 15, 2014 #2

    gneill

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    Staff: Mentor

    Your relevant equation is okay, but it looks like you set up the integral incorrectly. What function did you integrate?
     
  4. Jan 15, 2014 #3
    f(q)=i ?so integral of 3A which is (3t^2)/2 ?
     
  5. Jan 15, 2014 #4

    gneill

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    Staff: Mentor

    Nope. Your function is a constant. Dropping units for now, I(t) = 3. There's no "t" in the function to become a ##t^2## upon integrating.
     
  6. Jan 15, 2014 #5
    ye I was just being stupid, ty for the help
     
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