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Jan8-08, 06:11 PM
P: 117
Quote Quote by berkeman View Post
The only clue that I see at this point is that the word "balloon" is used in the body of the question. A balloon does not generally have a conducting surface. Have you posted the exact, total question with all of its text? Is there a figure or other information that you can add?
I was thinking the same thing, although being a insulator doesn't change anything if we are still ignoring polarization. Spherical charge distribution means zero interior field.
The only thing I can see that would result in a non-zero force for an interior charge is asymmetric charge distribution, either due to an asymmetric geometry or allowing polarization effects.