题目内容
某同学想测量某导电溶液的电阻率,先在一根均匀的长玻璃管两端各装了一个电极(接触电阻不计),两电极相距
,其间充满待测的导电溶液。
用如下器材进行测量:
电压表(量程l5 V,内阻约30
); 电流表(量程300
,内约
);
滑动变阻器(
,1 A); 电池组(电动势
,内阻
);
单刀单掷开关一个、导线若干。
下表是他测量通过管中导电液柱的电流及两端电压的实验数据.实验中他还用20分度的游标卡尺测量了玻璃管的内径,结果如图2所示。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347373316565.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413473736211402.jpg)
根据以上所述请回答下面的问题:
①玻璃管内径d的测量值为 mm;
②该同学根据上面表格中的数据描在右图坐标中,作出了
图象,并根据图象求出电阻
4.4×104~4.8×104
从而算出了导电溶液的电阻率,请你在(图l)中补画出未连接的导线.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413473769016890.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134736754522.png)
用如下器材进行测量:
电压表(量程l5 V,内阻约30
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134736785375.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134736832373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134736863409.png)
滑动变阻器(
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134737081391.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134737113515.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134737284463.png)
单刀单掷开关一个、导线若干。
下表是他测量通过管中导电液柱的电流及两端电压的实验数据.实验中他还用20分度的游标卡尺测量了玻璃管的内径,结果如图2所示。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347373316565.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413473736211402.jpg)
根据以上所述请回答下面的问题:
①玻璃管内径d的测量值为 mm;
②该同学根据上面表格中的数据描在右图坐标中,作出了
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134737378373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134737487328.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134737627306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413473769016890.jpg)
① 30.75mm;(3分)
②请在(图l)中补画出未连接的导线分压(2分) 外接(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347377054849.jpg)
②请在(图l)中补画出未连接的导线分压(2分) 外接(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347377054849.jpg)
①游标卡尺主尺读数为30mm,游标尺为20分度,每个最小格表示0.05mm,读数为15×0.05mm,所以游标卡尺读数为30mm+15×0.05mm=30.75mm②
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347377054849.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347377054849.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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