高二学生,学到电场,想问一下为什么均匀实心球体对内部某一点有引力,而空心球壳对内任意一点引力为零? 知乎 Template




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tomski高二学生,学到电场,想问一下为什么均匀实心球体对内部某一点有引力,而空心球壳对内任意一点引力为零? 知乎 coloring