Attractive and repulsive forces from net charges

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How do you determine the force between two objects based on their net charge. For example, if you have a charged balloon and you know the value of that charge and the distance it is away from a neutrally charged wall, how can the attractive force between the wall and balloon be determined?
 

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http://en.wikipedia.org/wiki/Coulomb's_law
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For there to be attraction or repulsion between two charged bodies, the basic requirement is that the bodies have a CHARGE. So what do you think will happen in case of the neutrally charged wall?
 

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