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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?