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Oil drop and electric field

  1. Oct 23, 2011 #1
    1. The problem statement, all variables and given/known data

    an oil drop carries six electronic charges, has a mass of 1.6 x 10^-12 g, has a mass of 1.6 X10^-12g, and falls with a terminal velocity in air. what magnitude of vertical electric field is required to make the drop move upward with the same speed as it was formerly moving downward?

    2. Relevant equations

    E=F/Q

    3. The attempt at a solution

    what i did is multiply mass by g, gives the electric force, and then divided by the charges.am i doing it right?
     
  2. jcsd
  3. Oct 23, 2011 #2
    See,

    http://www.antonine-education.co.uk/physics_a2/options/Module_8/Topic_2/topic_2.htm [Broken]

    and,
     

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    Last edited by a moderator: May 5, 2017
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