一特殊滑动变阻器的结构示意图如图甲所示,其主体为两段长度相同、材料相同的圆柱形导体拼接成的电阻,滑片
可以自由滑动,
、
间的电阻
与
、
间的距离
的关系如图乙所示,则左、右两侧的圆柱形导体横截面的半径之比为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/984f2b8e-0944-41bf-a3ca-01a7964e97ce.png?resizew=373)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/984f2b8e-0944-41bf-a3ca-01a7964e97ce.png?resizew=373)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-04-22 13:48:16
|
【知识点】 电阻定律的内容及表达式
相似题推荐
单选题-单题
|
较易
(0.85)
【推荐1】下列说法中正确的是( )
A.由![]() |
B.由![]() |
C.各种材料的电阻率都与温度有关,金属的电阻率随温度的升高而减小 |
D.半导体的电阻率随温度的升高而增大 |
您最近一年使用:0次
单选题-单题
|
较易
(0.85)
名校
【推荐2】如图所示,为同种材料制成的厚度相同的两个电阻
和
,表面均为正方形,其边长之比为
:
=2:l.通过导体的电流方向如图所示,则
和
的电阻之比为( )
![](https://img.xkw.com/dksih/QBM/2018/11/9/2071736677015552/2074190872543233/STEM/4bb8272c-c390-4b44-a4c3-b71181bb2ca0.png?resizew=315)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://img.xkw.com/dksih/QBM/2018/11/9/2071736677015552/2074190872543233/STEM/4bb8272c-c390-4b44-a4c3-b71181bb2ca0.png?resizew=315)
A.2:1 | B.4:1 | C.1:1 | D.1:2 |
您最近一年使用:0次