用两根等长的绝缘细丝线各悬一个小球并挂在同一点如图所示.已知两球质量相同当它们带上同种电荷时推开一段距离r后处于平衡状态.若使它们的带电 Template




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tomski用两根等长的绝缘细丝线各悬一个小球并挂在同一点如图所示.已知两球质量相同当它们带上同种电荷时推开一段距离r后处于平衡状态.若使它们的带电 coloring