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Gaokao Physics Practice Question

一充电后的平行板电容器保持两极板的正对面积、间距和电荷量不变, 在两极 板间插入一电介质, 其电容 C 和两极板间的电势差 U 的变化情况是

  1. A.C 和 U 均增大
  2. B.C 增大, U减小
  3. C.C 减小, U 增大
  4. D.C 和 U 均减小

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