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【单选题】
在一个电场中有 a 、 b 两点,相距为 d ,电场强度为 E ,把一个电荷量为 q 的正电荷由 a 点移到 b 点时,克服电场力做功 W ,下列说法正确的是 ( )A.
该电荷在 a 点电势能比 b 点大
B.
a 点电势比 b 点电势低
C.
a 、 b 两点电势差大小一定为 U ＝ Ed
D.
a 、 b 两点电势差 U ab ＝ W/q
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