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The gold leaf is the mobile part which you see above. When the positive rod approaches, the electrons flow towards it (positive charges attract negative charges), leaving the area close to the gold leaf positively charged (because it is deprived of electrons).

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An electroscope is an early scientific instrument that is used to detect the presence and magnitude of electric charge on a body. It was the first electrical measuring instrument. The first electroscope, a pivoted needle called the versorium, was invented by British physician William Gilbert around 1600