How to distinguish the charge carry by different object after rub by something?

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SUMMARY

The discussion focuses on distinguishing the electric charge carried by different objects after they are rubbed against various materials. Historical theories suggested two types of electricity, one from resin and plastic and the other from glass, which are now understood as opposites of the same phenomenon. The conversation emphasizes the importance of careful experimentation to determine the nature of the charge transfer. For further understanding, the discussion references a Wikipedia article on electric charge.

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How to distinguish the charge carry by different object after rub by something??

Homework Statement


How to distinguish the charge carry by different object after rub by different things??


Homework Equations


Nope~


The Attempt at a Solution


I do the experiment in the school, but every group got different answers,. So I hope someone chould give me the theory about my question, thanks~~
 
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Please describe the experiment.

Historically it has been very difficult to determine the charge that gets transferred when different items get rubbed. Initialy it was thought that there were two kinds of electricity - the kind you get rubbing resin and plastic, and the kind you get rubbing glass.

Careful experimentation can show you that these two are opposites of the same thing - so that it is useful to think of one as the presence of something and the other it's absence. However, which it was took a long time to work out.

Wikipedia has an overview and history.
http://en.wikipedia.org/wiki/Electric_charge
 

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