题目内容
(10分)在真空中的O点放一点电荷Q=1.0×10-9 C,直线MN过O点,OM=30cm,M点放一点电荷q=
C,如图所示。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250004093801260.jpg)
求:(1)M点的电场强度大小;
(2)若M、 N两点的电势差为15V,则电荷q从M点移到N点,电势能变化了多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000409364530.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250004093801260.jpg)
求:(1)M点的电场强度大小;
(2)若M、 N两点的电势差为15V,则电荷q从M点移到N点,电势能变化了多少?
(1) 100N/C (2)电势能增加3×![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000409473436.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000409473436.png)
试题分析:(1) 点电荷的电场强度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250004094891575.png)
(2)WMN= qUMN=-3×
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000409473436.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000409473436.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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