Find out if something is positively or negatively charged using just a DIY electroscope. This determines the sign of the electrostatic charge on an electrostatically charged object. The electroscope is first inductively charged from the object being tested. Then a plastic coke bottle is used as an object with known polarity in order to do the test and is triboelectrically charged.
The video showing how to make your own electroscope is:
How inductive charging works video:
The Triboelectric effect video
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Post time: Jun-12-2017