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Homework Help: What is the mass of the sphere?

  1. Jun 27, 2013 #1
    1. The problem statement, all variables and given/known data
    Two large , horizontal charged plates are separated by 0.050m. A small plstic sphere is stationary and suspended between them and is experiencing an electric force of 4.5x10^-15 N.
    What is the mass of the sphere?

    F=ma

    My attempt.

    F=4.5x10^-15N
    a=9.8m/s^2
    m=4.5x10^-15 N/9.8^2
    =4.59x10^-16kg
     
  2. jcsd
  3. Jun 27, 2013 #2
    looks correct. But use 'g' instead of 'a' as sphere is at rest.
     
  4. Jun 27, 2013 #3

    collinsmark

    User Avatar
    Homework Helper
    Gold Member

    Deleted post. I completely misread the problem. :blushing:
     
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