how does an electoscope work
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When the charge is positive, electrons in the metal of the electroscope are attracted to the charge and move upward out of the leaves. ... When the charge is negative, the electrons in the metal of the electroscope repel and move toward the leaves on the bottom.
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It detects charge by the movement of a test object due to the Coulomb electrostatic force on it. The amount of charge on an object is proportional to its voltage.
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