To compensate for this movement of ions , electrons have to move in the opposite direction ? and if the electrodes are connected by a conducting wire running through a useful circuit , that is the route they will take 为了补偿离子的移动，电子必须以相反的方向移动? ?并且如果电极之间用导线相连变成一个有效的循环，这就是电子将要运动的路线。
By using the conclusion from teaching material and taking rectangle current coil to be four conducting wire , the formular of magnetic fieldis derived and the special case of square current coil is also discussed 摘要利用教材中一个常见例题的结论，将矩形载流线圈视为四段载流导线，采取分段计算然后叠：加的方法，导出了矩形载流线圈空间磁场分布的普遍表达式，并讨论正方形线圈的特殊情况。
