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新编初中物理第二册第十一章第四节《电流的磁场》的编排是:由电路接通,导线中有电流,位于磁场中的磁针发生偏转,而引出电流和磁的关系。由奥斯特实验引出,电流的周围存在着磁场,即电流的磁效应,之后又叙述:“实验还表明,电流的方向改变了,磁针的偏转方向也相反,这说明,电流的磁场方向跟电流方向有关。”但是,直线电流的磁场方向与电流方向的关系如何,怎样判定该磁场的方向,课本内容并没有讨论。接着讨论了电流磁场的研究历史和通电螺线管的磁场,在研究通电螺线管
The arrangement of the magnetic field of the current in the fourth chapter of the new junior middle school physics book is: the circuit is connected, the current is in the wire, the magnetic needle in the magnetic field is deflected, and the relationship between the current and the magnetic is drawn. From the Auster experiment, there is a magnetic field around the current, which is the magnetic effect of the current. Then it is stated: “The experiment also shows that the direction of the current has changed, and the direction of deflection of the magnetic needle is also reversed. This shows that the magnetic field direction of the current With the direction of the current.”However, the relationship between the direction of the magnetic field of the linear current and the direction of the current, how to determine the direction of the magnetic field, the textbook content is not discussed. Then we discussed the research history of the current magnetic field and the magnetic field of the energized solenoid, and studied the energized solenoid.