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Homework Help: Finding current

  1. Apr 2, 2013 #1
    1. The problem statement, all variables and given/known data

    If a beam of 9.39 x10^20 alpha particles passes a given point in 1.50s, what is the current?

    2. Relevant equations


    3. The attempt at a solution

    umm the answer is 2.00 x 10^2 A, not sure where to begin. Would be a great help if someone can point me to the right direction.
  2. jcsd
  3. Apr 2, 2013 #2
    Just apply the equation you wrote in section 2.
  4. Apr 2, 2013 #3
    umm can you show me? I dont see how that can come out to be 2.00 x 10^2 A.
  5. Apr 2, 2013 #4
    What's the charge on an alpha particle?
    Then you can work out the total charge passing the point in the 1.50s interval.
    Then just apply the equation.
  6. Apr 2, 2013 #5
    The charge of an alpha particle is +2.
    How do i find the total charge? Because i dont know how to incorporate the 9.39 x10^20 part of the question into the equation.
  7. Apr 2, 2013 #6


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    Homework Helper

    Charge is measured in Coulombs when using the standard equations !!!
  8. Apr 2, 2013 #7
    The charge on one alpha particle is 2e
    What's the charge on x alpha particles?
  9. Apr 2, 2013 #8
    woot, thank you!! I got it.
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