A charged balloon

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Homework Statement



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

Here is a link. It is question 15.

http://cf.linnbenton.edu/mathsci/physci/rajabza/upload/wkbk_solutions_27.pdf

Homework Equations





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?
 

Answers and Replies

  • #2
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The answer there is correct.
The density is decreasing, but the surface area is increasing.
 
  • #3
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Thank you!
 

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