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Gaokao Physics Practice Question

真空中, A、B两点与点电荷 $Q$ 的距离分别为 $r$ 和 $3 r$, 则 $A 、 B$ 两点的电场强度 大小之比为

  1. A.3: 1
  2. B.$1: 3$
  3. C.9: 1
  4. D.$1: 9$

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