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千千万万遍
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此套试卷由三部分组成
20道选择题
5道带绘图简答题
以及3道开放性简答题组成
每道大题含有不同数量的小题
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Part A选择题部分:
Part B简答题部分
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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