【題目】如圖所示,空間有一正四棱錐P-ABCD,P為公共頂點(diǎn),ABCD分別為底面的四個(gè)頂點(diǎn),現(xiàn)在P點(diǎn)固定一正點(diǎn)電荷,下列說法正確的是
![](http://thumb.zyjl.cn/questionBank/Upload/2020/10/06/06/86321811/SYS202010060601101197312958_ST/SYS202010060601101197312958_ST.001.png)
A.A、B兩點(diǎn)的場(chǎng)強(qiáng)相同
B.A點(diǎn)的電勢(shì)比C點(diǎn)的電勢(shì)高
C.將一負(fù)點(diǎn)電荷從C點(diǎn)沿CD移到D點(diǎn),電場(chǎng)力先做負(fù)功后做正功
D.將一負(fù)點(diǎn)電荷從A點(diǎn)沿AD移到D點(diǎn),該點(diǎn)電荷的電勢(shì)能先減小后增大