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Homework Help: Finding the mass after gaining elctrons

  1. May 11, 2009 #1
    1. The problem statement, all variables and given/known data
    A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -73 µC. How many excess electrons does this person get?

    2. Relevant equations

    so i did 73x10^-6 / 1.602x10^19 and i got 4.5x10^14

    but one of the questions is By how much does her mass increase?

    3. The attempt at a solution

    I have no idea how i would go about and in finding this.
  2. jcsd
  3. May 11, 2009 #2


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    Staff Emeritus
    Science Advisor

    One has the number of electrons. Now what is the rest mass of an electron? Use the two numbers to determine the total mass of electrons gained.
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