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Mass changed if q is produced by adding to electrons mass

  1. Sep 2, 2015 #1
    Can someone walk me through calculating the final step in this problem.

    Problem statement:

    If the charge q is produced by adding electrons to the mass, by how much will the mass be changed?

    It was calculated that the charge q is 2.374 * 10^-7 C which is correct and I know that we need to balance (m + m')g = ?

    If I were in different units I would balance this with q * e/(2 * epsilon_0)
    I just don't know what I'm supposed to be balancing this with to solve for m'

    The mass is .0227 kg and the charge is suspended .0477 m above a nonconducting plate.
     
  2. jcsd
  3. Sep 2, 2015 #2
    Nevermind I figured it out

    m = [(2.374 * 10^-7)/(1.6 * 10^-19)] * (9.11 * 10^-31)
     
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