题目内容
如图所示,A、B上是一条电场线上的两点,一正电粒子由A点静止释放,只在电场力作用下运动到B点,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153302799516.png)
A.电势能 EA>EB
B.电势能EA<EB
C.电势
A<
B
D.电势
A>
B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153302799516.png)
A.电势能 EA>EB
B.电势能EA<EB
C.电势
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153302893345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153302893345.png)
D.电势
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153302893345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153302893345.png)
AD
试题分析:正电荷在电场力作用下,从A运动到B,说明电场力为AB方向。因此电场力做正功
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153303361979.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153303501591.png)
点评:此类题型考察了对电场力做功与电势能之间的关系。由于电势、电势能等均为标量,在计算过程中,最好将它们当作代数运算。
![](http://thumb2018.1010pic.com/images/loading.gif)
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