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千千萬萬遍
共計3小時考試時間
此套試卷由三部分組成
20道選擇題
5道帶繪圖簡答題
以及3道開放性簡答題組成
每道大題含有不同數(shù)量的小題
請點擊訪問下方鏈接進入下載頁面
Part A選擇題部分:
Part B簡答題部分
Solution to Problem 21:
The material of both balls is an insulator. Therefore, charges cannot travel inside the balls. However, the electric field of the charged ball induces the?polarization of molecules in the neutral ball and the neutral ball may be treated as a dipole. However, the electric field of the dipole is weaker than the field between the charged ball and the negative “end” of the neutral ball. Therefore, the field lines everywhere have the horizontal component from the charged ball to the neutral ball. The position of the balls and their threads does not change relatively to the initial one, as the balls attract each other.

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