When two substances are rubbed against each other, each of them gain a charge. How to know if one gained +ve charge or -ve charge? Please answer.
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Electroscope. An electroscope is a device that detects static electricity by using thin metal or plastic leaves, which separate when charged. An object with a suspected static electric charge is brought near the metal plate or ball of the electroscope
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he method of triboelectric charging usually involves rubbing an object against a second ... during the rubbing process such that both objects acquire a charge.
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