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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

    Astronuc

    User Avatar

    Staff: Mentor

    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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