初中物理有一个重要实验———“磁场对电流的作用”。依据教材的实验装置 ,由于不能同时观察到通电直导体在磁场力的作用下相向或同向运动现象 ,学生很难就磁场对电流作用引发问题 ,提出猜想。为此 ,笔者受立体交通的启发 ,对该实验装置进行了重新设计与制作。1　材料(1 )长 2 There is an important experiment in junior high school physics—“the effect of magnetic field on current”. According to the teaching device of the teaching material, students can hardly think about the problem caused by the magnetic field’s action on the current because they cannot simultaneously observe the opposite or the same direction of movement of the powered straight conductor under the action of the magnetic field force. For this reason, the author was inspired by the three-dimensional traffic and redesigned and manufactured the experimental device. 1 Material (1) Long 2