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Charge passing through a cross section for a time varying current

  1. Apr 8, 2017 #1
    1. The problem statement, all variables and given/known data
    The current in a wire varies with time according to the equation I(t) = 6.00 A + (4.80 A/s)t, where t is in seconds. How many coulombs of charge pass a cross section of the wire in the time period between t = 0.00 s and 3.00 s

    2. Relevant equations
    I=dq/dt

    3. The attempt at a solution
    So since were calculating the current, i solved for q=(integral)I*dt which was the integral from 0 to 3 (6.00A+(4.80)t and got the answer q = 75.6 which is wrong. The answer is q= 39.6.
    I know the problem lies in the math but im not sure where im wrong.
     
    Last edited by a moderator: Apr 9, 2017
  2. jcsd
  3. Apr 9, 2017 #2
    Can you write out your steps in performing your integral so we can see where you made a mistake.

    Edit: Maybe you attempted to post a picture and it didn't show up.
     
  4. Apr 9, 2017 #3
    Actually i think i input my equation wrong i got the right answer
     
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