如图所示，无限长直导线在 P处弯成半径为R 的圆，当通以电流I 时，则在圆心O点的磁感强度大小等于http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/ff6cdd164782462491b9cbca5a6ebb8e.PNG
举一反三
- 无限长直导线在P处弯成半径为R的圆,当通以电流I时,则在圆心O点的磁感强度大小等于:503649243a657776db14f08453e10c90.png
- 无限长直导线在P处弯成半径为 R 的圆，当通以电流I时，则在圆心O点的磁感强度大小等于（ ）。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/ea9d82a600684de2a916e5c304869893.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/ba82b51586c84ba098c3a6464b629ffa.png" /> B: 0 C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5ed485ce1868458ca1d09cb5e134c4d0.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/07acf7ef8e7f4393864785943a134038.png" />
- 如图所示,无限长直导线在P处弯成半径为R的圆,当通以电流I 时,则在圆心O点的磁感强度大小等于。[img=212x121]180a2ad256d3ce5.png[/img]
- 如图所示,无限长直导线在P处弯成半径为R的圆,当通以电流I时,则在圆心O点的磁感强度大小等于[img=104x80]17ce3c1800ae3bf.png[/img]
- 如图所示，无限长直导线在P处弯成半径为R的圆，当通以电流I时，则在圆心O点的磁感强度大小等于（） A: A B: B C: C D: D