题目内容
关于对U
=W
/q 、U
和电势φ
、φ
的理解,正确的是 ( )
A、电场中A、B两点的电势差和两点间移动电荷的电量q成反比
B、在电场中A、B两点移动不同的电荷,电场力的功W
和电量q成正比
C. U
表示B点与A点之间的电势差,即U
=φ
?φ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825398269.png)
D. φ
、φ
都有正负,所以电势是矢量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825258254.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825398269.png)
A、电场中A、B两点的电势差和两点间移动电荷的电量q成反比
B、在电场中A、B两点移动不同的电荷,电场力的功W
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
C. U
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825679229.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825398269.png)
D. φ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825679229.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825398269.png)
BC.
试题分析:电场中两点间的电势差只和电场强度有关,即和电场的本身性质有关,和移动电荷无关,A错误,根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150826069557.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150824915330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150826412608.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825679229.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150825398269.png)
点评:本题属于基础题目,关键是理解电场中两点间的电势差只和电场强度有关,即和电场的本身性质有关,
![](http://thumb2018.1010pic.com/images/loading.gif)
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