题型:单选题-单题
难度:0.65
引用次数:279
题号:19358129
如图所示,半径为L的导电圆环(电阻不计)绕垂直于圆环平面、通过圆心O的金属轴以角速度ω逆时针匀速转动。圆环上接有电阻均为r的三根金属辐条OA、OB、OC,辐条互成
角。在圆环圆心角
的范围内(两条虚线之间)分布着垂直圆环平面向外、磁感应强度大小为B的匀强磁场,圆环的边缘通过电刷P和导线与一个阻值也为r的定值电阻
相连,定值电阻
的另一端通过导线接在圆环的中心轴上,在圆环匀速转动过程中,下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae74719e5f08ee47f978da60189ffea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/3821f3ae-3263-4746-ae42-79f4402353f7.png?resizew=177)
A.金属辐条OA、OB、OC进出磁场前后,辐条中电流的大小不变,方向改变 |
B.定值电阻![]() ![]() |
C.通过定值电阻![]() ![]() |
D.圆环转动一周,定值电阻![]() ![]() |
更新时间:2023-06-20 19:00:29
|
【知识点】 导体棒转动切割磁感线产生的动生电动势
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单选题-单题
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适中
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【推荐1】如图,间距为
的平行金属导轨
固定在绝缘水平面内,
间接有阻值为
的定值电阻,长为
的金属棒
垂直置于导轨上,
端恰好搭在导轨
上,整个装置处在垂直于水平面向上的匀强磁场中,磁感应强度大小为
。现将金属棒绕
端以角速度
沿顺时针方向匀速转动
角,转动过程中,金属棒与两导轨接触良好。不计金属棒和导轨的电阻,
,在此过程中下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2023/11/7/3363012946411520/3364256042876928/STEM/e77ca024ce974158847ccc157f06d2d3.png?resizew=219)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521b3b99c0fab91e08a6834ef08cfab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac8db488ff9644518e26fbaa8ff6074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d916a406adac9fa4dcfbad152547ac9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
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![](https://img.xkw.com/dksih/QBM/2023/11/7/3363012946411520/3364256042876928/STEM/e77ca024ce974158847ccc157f06d2d3.png?resizew=219)
A.![]() ![]() |
B.电阻![]() ![]() |
C.电阻![]() ![]() |
D.通过定值电阻![]() ![]() |
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单选题-单题
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适中
(0.65)
名校
【推荐2】如图所示,水平间距为L,半径为r的二分之一光滑圆弧导轨,
为导轨最低位置,
与
为最高位置且等高,右侧连接阻值为R的电阻,圆弧导轨所在区域有磁感应强度为B、方向竖直向上的匀强磁场。现有一根金属棒在外力的作用下以速度
从
沿导轨做匀速圆周运动至
处,金属棒与导轨始终接触良好,金属棒与导轨的电阻均不计,则该过程中( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/ed1122af-da2a-4245-bd84-6c57c5dd4a4d.png?resizew=250)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579d30cd992d70b5ea61728325a8630e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d89cdcd52a6c744045562f2dc81a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb994efddf1d6a9978c3f8cf555d5cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d89cdcd52a6c744045562f2dc81a44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/ed1122af-da2a-4245-bd84-6c57c5dd4a4d.png?resizew=250)
A.经过最低位置![]() |
B.经过最低位置![]() ![]() |
C.全程电阻R上产生的热量为![]() |
D.全程通过电阻R的电荷量为![]() |
您最近一年使用:0次