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96期第八教授班小考線上作答系統-第21章-前測 (2024-08-19)(報名截止)
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第一題
1. When a glass rod is rubbed with silk cloth, the rod becomes positively charged as
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第二題
2. Which of the following terms is used to describe a material that does not allow electrons to easily move through it?
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第三題
3.Three identical conducting spheres on individual insulating stands are initially electrically neutral. The three spheres are arranged so that they are in a line and touching as shown. A negatively-charged conducting rod is brought into contact with sphere A. Subsequently, someone takes sphere C away. Then, someone takes sphere B away. Finally, the rod is taken away. What is the sign of the final charge, if any, of the three spheres? BallA BallB Ball C
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第四題
4. Consider the conducting spheres labeled A, B, and C shown in the drawing. The spheres are initially charged as shown on the left, then wires are connected and disconnected in a sequence shown moving toward the right. What is the final charge on sphere A at the end of the sequence?
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第五題
5. Two point charges are stationary and separated by a distance R. Which one of the following pairs of charges would result in the largest repulsive force?
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第六題
6. The drawing shows a hollow conducting sphere with a net positive charge uniformly distributed over its surface. A small negatively-charged object has been brought near the sphere as shown. What is the direction of the electric field at the center of the sphere?
※ 第六題作答




※ 第七題名詞解釋: Coulomb’s Law 庫倫定律

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