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Homework Help: Bubbles and Charges

  1. Apr 28, 2012 #1
    1. The problem statement, all variables and given/known data
    Find the amount of charge required to double the radius of a bubble of radius r and surface tension T.

    2. Relevant equations
    Increase in surface energy of bubble = T ΔA

    3. The attempt at a solution
    I've tried equating the increase in surface energy to the work done by the Coulomb force, but I'm finding a lack of information. Do I just assume that the charge is some distance away from the bubble? Then what will be the integration limits for F . dr?
  2. jcsd
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