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Bringing A Charge Near An Electroscope

An electroscope is a device used to detect the presence of charge and it's relative amount.  The electroscope is usually constructed with a metal plate or sphere at the top of a metal post with thin foil leaves hanging from the bottom of the post.  This setup is typically supported in a flask or some other transparent enclosure.  If a charged object is brought near the top of the electroscope...

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