• 2022-06-14
    两根无限长直导线互相平行,分别通过同方向大小为I和4I的恒定电流,已知两长直导线相距为d, 则磁感强度B等于零的位置距通电I的导线为x, x大小等于( )
    A: [img=22x33]1803df268ea536b.jpg[/img]
    B: [img=20x33]1803df26973b3d0.jpg[/img]
    C: [img=24x34]1803df269f1fb4c.jpg[/img]
    D: [img=20x33]1803df26a71bc4d.jpg[/img]
  • 举一反三