Finding the mass after gaining elctrons

  • Thread starter MRGE
  • Start date
  • #1
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Homework Statement


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?


Homework 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?

The Attempt at a Solution



I have no idea how i would go about and in finding this.
 

Answers and Replies

  • #2
Astronuc
Staff Emeritus
Science Advisor
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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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