题目内容
两个大小相同的小球带有同种电荷(可看作点电荷),质量分别为m
和m
,带电荷量分别是q
和q
,用绝缘线悬挂后,因静电力而使两悬线张开,分别与铅垂线方向成夹角θ
和θ
,且两球同处一水平线上,如图1—2—3所示,若θ
=θ
,则下述结论正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241440147451643.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144013934195.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144014028240.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144013934195.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144014028240.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144014371195.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144014028240.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144013934195.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144014028240.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241440147451643.jpg)
A. m![]() ![]() |
B.一定满足q![]() ![]() ![]() ![]() |
C.q![]() ![]() |
D.必须同时满足q![]() ![]() ![]() ![]() |
A
可任选m1或者m2为研究对象,现以m1为研究对象,其受力如图所示,无论q1、q2的大小关系如何,两者之间的库仑斥力是大小相等的,故
,即m
= m
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241440164612305.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144016165874.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144013934195.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144014028240.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241440164612305.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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