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Homework Help: How Many Electrons

  1. Feb 9, 2004 #1
    THe question is.
    How many electrons must be transferred to a body to give it a negative charge of 4.00nC.????/
    So going with what I think 4*10^-9/1.602189...*10^-19=
    =25*10^9.
    BUT the answer in my book. is 390*10^-9.
    What am I missing. Is this negative thing screwing me up or is the answer in my book wrong?
    I Can't find anywhere in my book that helps.
     
  2. jcsd
  3. Feb 10, 2004 #2

    Doc Al

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    Staff: Mentor

    Your method and answer seem correct. The book's answer is silly. :smile:
     
  4. Feb 10, 2004 #3

    Chi Meson

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    Science Advisor
    Homework Helper

    OFten what happens: a book will change their problems slightly when a new edition is made, but sometimes they forget to change the selected answers in the back.
     
  5. Feb 10, 2004 #4
    Thanks

    Hopefuly that was it. Cause I went into my test today with the way I was doing it, Forget the book maybe I should just ask you guys.
    Thanks
     
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