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Chapter 21: Problem 10

You bring a negatively charged rubber rod close to a grounded conductor without touching it. Then you disconnect the ground. What is the sign of the charge on the conductor after you remove the charged rod? a) negative d) cannot be determined from b) positive the given information c) no charge

Short Answer

Expert verified
Answer: b) positive

Step by step solution

01

Understand grounding and induction

When a negatively charged rubber rod is brought close to a conductor, the electrons in the conductor are repelled by the negatively charged rod and move away from it. This results in a separation of charges within the conductor, with the side closer to the charged rod being positively charged (due to the lack of electrons) and the other side being negatively charged (due to an excess of electrons). This process is called induction.
02

Grounding the conductor

When the conductor is connected to the ground, it allows electrons to flow between the conductor and the ground. In this case, because the side of the conductor farther from the rod is negatively charged (there are excess electrons), those excess electrons will flow into the ground, leaving the conductor with an overall positive charge.
03

Disconnecting the ground and removing the charged rod

Once the ground connection is removed, the flow of electrons between the conductor and the ground stops. This means the conductor retains its positive charge. After removing the charged rod, the conductor remains positively charged.
04

Determine the sign of the charge on the conductor

Based on the previous steps, at the end of the process, the conductor is left with a positive charge. Therefore, the correct answer is: b) positive

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