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Homework Help: Balloon losing electrons

  1. Jan 26, 2008 #1
    [SOLVED] Balloon losing electrons

    1. The problem statement, all variables and given/known data
    You have a neutral balloon. The charge of an electron is -1.6x10^-19C.
    What is its charge after 19000 electrons have been removed from it? Answer in units
    of microcoulombs.

    2. Relevant equations
    I THINK Q = Ne

    3. The attempt at a solution
    This question should be very easy but for some reason Im hesitant to answer it any more because I lose points every time I do it. I understand that when you remove electrons from an object the particle becomes positively charged, so this rules out a negative answer.

    I tried 19000 x 1.6x10^-19 and submitted that answer = 3.04x10^-15
    I also tried 19000 x 1.6x10^-19 x 10^-6 ( converting to microC ), and that answer was still wrong = 3.04x10^-21

    What am I doing wrong? This seems too simple ... :(
    Thank you!
  2. jcsd
  3. Jan 26, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    You are doing your conversion backwards! Divide by 10^-6.
  4. Jan 26, 2008 #3
    oh god.

    thanks a bunch
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