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Consider the electroscope shown in the image. The electroscope has an equal number of freely moving negative and positive charges.
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Which of the following procedures will result in a negatively charged electroscope?
Bring a negatively charged rod near to, but not touching, the metal sphere.
Bring a positively charged rod near to, but not touching the metal sphere.
Touch a negatively charged rod to the metal sphere, then remove the rod.
Touch a positively charged rod to the metal sphere, then remove the rod.