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Homework Help: Magnitude of the charge on the oil drop

  1. Jul 15, 2012 #1
    1. An electrically charged macroscopic spherical oil drop of mass M=5.449x10^(-14) kg is released from rest between two electrically charged horizontal plates that produce a uniform electric field magnitude of E=1.667x10^6 N/C that is directed vertically upward. If, after release, the oil drop remains at rest, what is the the magnitude of the charge on the oil drop?

    2. The attempt at a solution:


    q= Mg/E

    q= (5.449x10^-14)(9.8)/(1.667x10^6)

    q=3.203x10^-19 C ----> is this the magnitude of the charge?
  2. jcsd
  3. Jul 15, 2012 #2
    yes it is
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