A negatively charged rod is brought near an uncharged, grounded electroscope. Which of the following statements is true?
Question
A negatively charged rod is brought near an uncharged, grounded electroscope. Which of the following statements is true?
Solution
When a negatively charged rod is brought near an uncharged, grounded electroscope, the following happens:
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The negatively charged rod repels the free electrons in the electroscope, causing them to move away from the rod and down into the ground. This is due to the law of electrostatics that like charges repel each other.
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This movement of electrons leaves the top of the electroscope positively charged, as there are now more protons than electrons.
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If the ground connection is then removed, the electroscope remains positively charged.
So, the statement that is true is: "The electroscope will end up positively charged."
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