2. Which of the following pieces of evidence should lead the student to change h

Question

2. Which of the following pieces of evidence should lead the student to change her model (either the diagram, the written explanation, or both)? Choose all answers that apply.

Select one or more:

a.

Evidence that a negatively-charged object repels the tinsel (pushes the tinsel strands together), when the negatively-charged Styrofoam plate is being held close to the electroscope’s base side.

b.

Evidence or separate knowledge that, while both types of charges can move, they can only move a very short distance in the soda can.

c.

Evidence or separate knowledge that the middle portion of the soda can (between the top and base) is uncharged when the negatively-charged plate is held near the base end.

d.

Evidence or separate knowledge that only one type of charge (either + or –) can actually move in the electroscope, rather than both types (+ and -) of charges moving.

The quiz questions will be based on the sample model and explanation below. In another class, a student drew a diagram and gave an written explanation for what happens when a negatively-charged Styrofoam plate is brought near a soda can electroscope Before Negatively () charged Styrofoam close to base end Before the plate is brought Close to the base end of the soda can e ectroscope, the positive and negative charges are uniformly distributed in the soda can and the tinsel and both ends of the soda can are uncharged when the negative y charged Styrofoam plate is brought next to the electroscope, all of the positive charges in the soda can (and the tinsel) move toward the negatively charged plate because of the Law of Electrik Charges, which states that opposite charges attract. All of the negatively charged particles move toward the tinsel end, and into the tinsel, because like charges repel. For that reason, the negatively-charged pieces of tinsel repel each other Question 1) Evaluate the student's model. Can the diagram and the written explanation account for the evidence presented in the experiment and simulation movies that you watched in this extension? Select one: The diagram can account for the evidence provided by the movies, but the written explanation cannot. b. Neither the diagram nor the wrtten explanation can account the evidence provided by the movies Both the diagram and the written explanation can account for the evidence provided by the movies d. The written evidence can account for the evidence provided by the movies, but the diagram cannot.

Explanation / Answer

Correct options are a and d.

Option a leads to change in diagram. As the strands repel each other, the second diagram must show the strands farther apart.

For option d, we know only negative charges are movable. Positive charges are nothing but the absence of negative charge. So the statement changes accordingly. We can say that all the negative charges are repelled to the strands and this creates positive charge at the end nearer to the positive rod

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