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Gaokao Physics Practice Question

在正点电荷 $Q$ 产生的电场中有 $M, N$ 两点，其电势分别为 $\varphi_M, \varphi_N$ ，电场强度大小分别为 $E_M, E_N$ 。下列说法正确的是 （ ）

  1. A.若 $\varphi_M > \varphi_N$ ，则 $M$ 点到电荷 $Q$ 的距离比 $N$ 点的远
  2. B.若 $E_M < E_N$ ，则 $M$ 点到电荷 $Q$ 的距离比 $N$ 点的近
  3. C.若把带负电的试探电荷从 $M$ 点移到 $N$ 点，电场力做正功，则 $\varphi_M < \varphi_N$
  4. D.若把带正电的试探电荷从 $M$ 点移到 $N$ 点，电场力做负功，则 $E_M > E_N$

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