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| 这题1.3两点是不是应该场强方向相反,大小相等?根据k q/r²一个点电荷带的正,一个带的 [电磁学] | 2020-07-19 | 3 | |
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| 如果是带同种电荷的两金属板平行近距离, [电磁学] | 2020-07-19 | 1 | |
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