1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Total charge in a circuit

  1. Mar 11, 2008 #1
    1. The problem statement, all variables and given/known data
    The total charge that has entered a circuit element is q(t)=2(3 − e[tex]^{-4t}[/tex]) when t≥0 and
    q(t)=0 when t<0. Determine the current in this circuit element for t≥0.

    2. Relevant equations

    3. The attempt at a solution

    i(t) = 2(4e[tex]^{-4t}[/tex]) + 3 - e[tex]^{-4t}[/tex]

    i(t) = 7e[tex]^{-4t}[/tex] + 3

    However the answer says 8e[tex]^{-4t}[/tex]

    What have I done wrong?
  2. jcsd
  3. Mar 11, 2008 #2
    Nvm. Dumb mistake, just realized. Solved.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook