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:
-
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.
-
This movement of electrons leaves the top of the electroscope positively charged, as there are now more protons than electrons.
-
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."
Similar Questions
The arm of a neutral electroscope is vertical, as shown in Figure 1. The electroscope is given a charge, and the arm moves to the position shown in Figure 2. Then a uniformly charged non-conducting rod is brought near the top of the electroscope, and the arm of the electroscope moves to the position shown in Figure 3. Which of the following must be true about the charge on the electroscope and the rod?
The positive charge flows from the electroscope to the groundThe negative charge flows from the electroscope to the groundThe negative charge flows from the ground to the electroscopeThe electroscope stays neutral because the rod doesn’t touch it
When a neutral body is touched with positively charged rod it will acquire in positive charge.a.TRUEb.FALSE
A plastic rod is rubbed with a piece of animal fur. The plastic rod acquires a negative charge during this process. Which of the following is true about the charge on the piece of fur?
A positively charged rod is brought near the disc of a positively charged gold leafelectroscope. State your observation with reason
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.