Van De Graaf: Why Do Bubbles Repel?

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tg22542
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What happens when you blow bubbles at a van de graaf, and why does that happen? I know that the bubbles will repel once they get closer, but why?
 
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For an explanation and a great animation, see this:
http://www.magnet.fsu.edu/education/tutorials/java/bubbles/
 
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