题目内容
北京正负电子对撞机的储存环是周长为240 m的近似圆形轨道.当环中电子以光速的的速度流动而形成的电流是10 mA时,环中运行的电子数目为(已知光速c=3×108 m/s,电子电荷量e=1.6×10-19 C) ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249474172216.jpg)
A.5×1010 B.5×1011 C.1×102 D.1×104
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249474172216.jpg)
A.5×1010 B.5×1011 C.1×102 D.1×104
B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412494744818706.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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