题目内容
如右上图所示,某一导体的形状为长方体,其长、宽、高之比为a∶b∶c=5∶3∶2.在此长方体的上下、左右四个面上分别通过导线引出四个接线柱1、2、3、4。在1、2两端加上恒定的电压U,通过导体的电流为I1;在3、4两端加上恒定的电压U,通过导体的电流为I2,则I1∶I2为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250031105501461.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250031105501461.png)
A.9∶25 | B.25∶9 | C.25∶4 | D.4∶25 |
C
试题分析:根据电阻定律R=ρ
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003110566412.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003110581441.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003110597450.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003110612665.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003110628431.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003110644434.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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