题目内容
(11分)如图7甲所示为一测量电解液电阻率的玻璃容器,P、Q为电极,设a=1 m,b=0.2 m,c=0.1 m,当里面注满某电解液,且P、Q加上电压后,其U-I图线如图乙所示,当U=10 V时,求电解液的电阻率ρ是多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241415026822844.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241415026822844.jpg)
40 Ω·m
由图乙可求得电解液的电阻为
R=
=
Ω=2000 Ω
由图甲可知电解液长为:l=a=1 m
截面积为:S=bc=0.02 m2
结合电阻定律R=ρ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141502931356.png)
得ρ=
=
Ω·m=40 Ω·m.
R=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141502697404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141502728556.png)
由图甲可知电解液长为:l=a=1 m
截面积为:S=bc=0.02 m2
结合电阻定律R=ρ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141502931356.png)
得ρ=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141502994517.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141503056608.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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