Question
During induction, a positively charged rod is brought near to but not touching the electroscope. The presence of the charged object above the plate of the electroscope induces charges to move up towards the conduction plate, giving the gold leaves an overall positive charge. The positive leaves repel. Describe the force(s) at work. Responses A Like charges repel; force-at-a-distance.Like charges repel; force-at-a-distance. B Opposites attract, contact force, followed by like charges repel, contact force.Opposites attract, contact force, followed by like charges repel, contact force. C Opposites attract, force-at-a-distance, followed by like charges repel, contact force.Opposites attract, force-at-a-distance, followed by like charges repel, contact force. D Opposites attract, force-at-a-distance, followed by like charges repel, force-at-a-distance.Opposites attract, force-at-a-distance, followed by like charges repel, force-at-a-distance. Question 2 This is a kind of electroscope student made in science class to study charges. Student Procedure: ~Tear off two pieces of tape, each 4 inches (10 cm) long. ~Press each piece firmly on the work table leaving one end of each tape piece sticking up as a handle. ~Quickly pull the tapes from the table and stick one piece on the arm of a straw in one film canister, and the other piece on the arm of a straw in the other film canister. ~Move the canisters so the two pieces of tape are face to face, about 6 inches apart. ~Slowly move the canisters closer together. This experiment illustrates several important facts about forces that include ALL BUT ONE of those listed here. Responses A Like charges repel or exert push.Like charges repel or exert push. B Pushing forces can work at a distancePushing forces can work at a distance C Like charges exert a pull from a distance.Like charges exert a pull from a distance. D Friction force can cause a transfer of charge.Friction force can cause a transfer of charge.
Answers
GPT-4o mini
Let's analyze both questions step by step.
### Question 1:
You described the process of charging an electroscope through induction when a positively charged rod is brought near it. In this scenario:
1. The positively charged rod induces a separation of charges within the electroscope, causing the gold leaves to gain a positive charge.
2. Since both gold leaves now hold positive charges, they will repel each other, resulting in an observable effect.
The forces involved can be classified as:
- **Force-at-a-distance** due to the electric field generated by the charged rod acting on the charges in the electroscope.
- **Repulsion** between like charges once the leaves both become positively charged.
Thus, the correct response is:
**D. Opposites attract, force-at-a-distance, followed by like charges repel, force-at-a-distance.**
While the first part regarding opposites attracting doesn't necessarily apply directly in this induction process (since we are not discussing physical contact), the latter half correctly describes the result of the charges being of the same sign repelling each other at a distance.
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### Question 2:
In this situation, the student is conducting an experiment with tape, which demonstrates the forces acting between charged objects.
The key points regarding the forces involved are:
- When two similarly charged surfaces are brought close to each other (like the taped straws), they will repel each other.
- This demonstrates the principle that like charges repel or exert push.
- The action of pulling the tape off the table demonstrates a process of creating charge through friction.
The misleading statement here is:
**C. Like charges exert a pull from a distance.**
This statement is incorrect because like charges exert a **repulsive** force, not an attractive one. Instead, they push away from each other when charged.
Hence, the answer is:
**C. Like charges exert a pull from a distance.**
### Question 1:
You described the process of charging an electroscope through induction when a positively charged rod is brought near it. In this scenario:
1. The positively charged rod induces a separation of charges within the electroscope, causing the gold leaves to gain a positive charge.
2. Since both gold leaves now hold positive charges, they will repel each other, resulting in an observable effect.
The forces involved can be classified as:
- **Force-at-a-distance** due to the electric field generated by the charged rod acting on the charges in the electroscope.
- **Repulsion** between like charges once the leaves both become positively charged.
Thus, the correct response is:
**D. Opposites attract, force-at-a-distance, followed by like charges repel, force-at-a-distance.**
While the first part regarding opposites attracting doesn't necessarily apply directly in this induction process (since we are not discussing physical contact), the latter half correctly describes the result of the charges being of the same sign repelling each other at a distance.
---
### Question 2:
In this situation, the student is conducting an experiment with tape, which demonstrates the forces acting between charged objects.
The key points regarding the forces involved are:
- When two similarly charged surfaces are brought close to each other (like the taped straws), they will repel each other.
- This demonstrates the principle that like charges repel or exert push.
- The action of pulling the tape off the table demonstrates a process of creating charge through friction.
The misleading statement here is:
**C. Like charges exert a pull from a distance.**
This statement is incorrect because like charges exert a **repulsive** force, not an attractive one. Instead, they push away from each other when charged.
Hence, the answer is:
**C. Like charges exert a pull from a distance.**