如图所示,三条长直导线都通有垂直于纸面向外的电流且与A点的距离相等,电流大小满足
。已知通电直导线形成的磁场在空间某点处的磁感应强度
,k为比例系数,r为该点到导线的距离,I为导线中的电流强度,I3在A点产生的磁感应强度为
,则三条长直导线在A点产生的总磁感应强度大小为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/1e9cfbb3-fb68-425d-a511-f5b1684ad8c4.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc50a8fc838c54c31dc72e71a7696018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd07b673cd70e3d05561ae31eace513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41d793c851a2f72f787913ba23e459c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/1e9cfbb3-fb68-425d-a511-f5b1684ad8c4.png?resizew=179)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-11-28 20:31:00
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【知识点】 直线电流周围的磁场
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【推荐1】如图所示,ACE是半圆弧,O为圆心,∠COD=37°,A、C、D处各有一垂直纸面的通电直导线,电流大小均为I,长度均为L,A和D处通电直导线的电流方向垂直纸面向外,C处通电直导线的电流方向垂直纸面向里,三根通电直导线在O点处产生的磁感应强度大小均为B,则O处的磁感应强度大小为( )
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【推荐2】如图所示,两平行长直导线中都通有竖直向下的电流,大小分别为I和2I,O点到两导线的距离相等,两电流在O点产生磁场的磁感应强度大小为B。将左侧电流大小调整为2I,方向调整为向上时,O点的磁感应强度大小为( )
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