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Math Help - [SOLVED] coulombs law help

  1. #1
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    [SOLVED] coulombs law help

    not exactly sure what to do ...

    How many electrons make up a charge of -30.0 micro coulombs ? [1.9 x 10^14]

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  2. #2
    Like a stone-audioslave ADARSH's Avatar
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    Quote Originally Posted by rock candy View Post
    not exactly sure what to do ...

    How many electrons make up a charge of -30.0 micro coulombs ? [1.9 x 10^14]

    Charge of an electron is -1.6 x 10^(-19) Coulomb

    1 Micro coulomb = 10^(-6) C



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  3. #3
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    no i knew that its 3.0 * 10 ^-6 C ... im not sure how they got 1.9*10^14 as an answer
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  4. #4
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    Quote Originally Posted by rock candy View Post
    no i knew that its 3.0 * 10 ^-6 C ... im not sure how they got 1.9*10^14 as an answer
    Number of electrons in 1.6 * 10^(-19) C = 1

    So number of electrons in 30 * 10^(-6) C

    = \frac{30 * 10^{(-6)} C}{1.6 * 10^{(-19)} C}

    = \frac{30 * 10^{(-6+19)} }{1.6}

    = 1.9*10^{14}~ electrons
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  5. #5
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    LOL omg ... i think im sleepy ... i kept doing this

    1.6*10^-19 / 3.0*10^-6 ... thanks
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