Shown on the right is an electroscope. The sphere on the top, the leaves at the bot- tom, and the rod connecting them are made by conducting material. The spherical shell that blocks the influence of external electric fields is also made by conducting material but the contact with the rod is insulated, so that charges will not shuffle between the rod and the spherical shell. The electroscope is first negatively charged by touching the sphere with a negatively charged plastic plate. The leaves spread apart and we remove the plastic plate. We then bring a positively charged glass bar close to the sphere without touching the sphere. What happens to the leaves? Leaves (A) One leaf moves higher, the other lower. (B) Nothing changes to the leaves (C) The leaves spread farther apart. (D) The leaves get closer together.

College Physics
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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Problem 1
Shown on the right is an electroscope. The sphere on the top, the leaves at the bot-
tom, and the rod connecting them are made by conducting material. The spherical
shell that blocks the influence of external electric fields is also made by conducting
material but the contact with the rod is insulated, so that charges will not shuffle
between the rod and the spherical shell. The electroscope is first negatively charged
by touching the sphere with a negatively charged plastic plate. The leaves spread
apart and we remove the plastic plate. We then bring a positively charged glass bar
close to the sphere without touching the sphere. What happens to the leaves?
Leaves
(A) One leaf moves higher, the other lower.
(B) Nothing changes to the leaves
(C) The leaves spread farther apart.
(D) The leaves get closer together.
Clearly specify/circle your answer, and give a brief explanation.
Transcribed Image Text:Problem 1 Shown on the right is an electroscope. The sphere on the top, the leaves at the bot- tom, and the rod connecting them are made by conducting material. The spherical shell that blocks the influence of external electric fields is also made by conducting material but the contact with the rod is insulated, so that charges will not shuffle between the rod and the spherical shell. The electroscope is first negatively charged by touching the sphere with a negatively charged plastic plate. The leaves spread apart and we remove the plastic plate. We then bring a positively charged glass bar close to the sphere without touching the sphere. What happens to the leaves? Leaves (A) One leaf moves higher, the other lower. (B) Nothing changes to the leaves (C) The leaves spread farther apart. (D) The leaves get closer together. Clearly specify/circle your answer, and give a brief explanation.
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