Key Concept: Induced Polarization
An uncharged object doesn't inherently have a net charge. However, when brought near a charged object, it can become *polarized*. This means that the charges within the uncharged object shift, creating a temporary separation of positive and negative charges.
The Force:
* Attraction: The charged object will always attract the uncharged object. This is because the closer they get, the stronger the induced polarization becomes. The opposite charges on the uncharged object are drawn closer to the charged object, leading to an attractive force.
* Distance: As the distance between the charged and uncharged objects decreases:
* The strength of the induced polarization *increases*.
* The attractive force between them *increases*.
Think of it this way:
Imagine a balloon rubbed on your hair (giving it a static charge). If you bring it near a neutral piece of paper, the paper will be attracted to the balloon. This is because the balloon's charge causes the paper to become polarized, creating a temporary attractive force. The closer the balloon gets, the stronger the attraction.
Important Note:
This attractive force between a charged object and a neutral object is weaker than the force between two charged objects. This is because the polarization is a temporary effect and not a permanent change in the net charge of the uncharged object.
