# The Naked Scientists Forum

### Author Topic: inflate a balloon with attractive charges distributed on balloon surface ?  (Read 1373 times)

#### flr

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##### inflate a balloon with attractive charges distributed on balloon surface ?
« on: 19/02/2010 21:29:40 »
1. If we distribute some electric charges all repulsive, on a surface of a balloon, I expect the balloon will inflate due to repulsion between charges.
The interactions are "transmitted" only along the balloon surface that means the distance between two charges is the shortest arc segment along the sphere surface.

2. Let's image now we distribute some "special charges" on the surface of a balloon which have the property that all charges attract each other (they are not electric charges, they are more like mass/gravity if you wish), and the attraction decreases with one over power 1 of the shortest arc segment along the sphere between two charges.

In the second case I can imagine the balloon shrinking,
but could it possible be a certain distribution of the attractive charges on balloon surface which inflate the balloon?

#### Soul Surfer

• Neilep Level Member
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• keep banging the rocks together
##### inflate a balloon with attractive charges distributed on balloon surface ?
« Reply #1 on: 19/02/2010 22:25:16 »
No

#### flr

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##### inflate a balloon with attractive charges distributed on balloon surface ?
« Reply #2 on: 20/02/2010 01:41:40 »
I would assume the same apply to our universe with (attractive) gravity only: there is no way to distribute masses such that the result is a dilation.

However, I can see a dilation possible locally.
As if there would be something truly massive beyond our universe (perhaps 'radial distributed'?) strongly attracting everything else.

#### The Naked Scientists Forum

##### inflate a balloon with attractive charges distributed on balloon surface ?
« Reply #2 on: 20/02/2010 01:41:40 »