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A charged balloon

  1. Sep 20, 2013 #1
    1. The problem statement, all variables and given/known data

    The charged balloon expands as it is blown up, increasing in size.

    Here is a link. It is question 15.


    2. Relevant equations

    3. The attempt at a solution

    Is that answer correct? Because what I was thinking was since the balloon surface area was increasing then the density decreases hence all the points are decreasing? Am I wrong and the answer provided in the link correct?
  2. jcsd
  3. Sep 21, 2013 #2


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    2017 Award

    Staff: Mentor

    The answer there is correct.
    The density is decreasing, but the surface area is increasing.
  4. Sep 22, 2013 #3
    Thank you!
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