论文部分内容阅读
初中物理“电磁现象”一章中,有关利用“三个定则”进行判定某个方向和小磁针在磁场中的指向的习题,有些学生判定出来的方向常出现错误。例如“图1是磁场对直线电流的作用,其通电直导线在这磁场中的运动方向是__。”又如“图2是通电直导线周围的磁力线方向,其导线中的电流方向是__。”这两道题不少学生会得出“向上”的答案。学生产生这个错误的原因之一与我们在教学中没有注
In the “Electromagnetic Phenomenon” chapter of junior high school physics, some students determine the direction in which mistakes are often made in the exercises that use the “three rules” to determine the orientation of a certain direction and a small magnetic needle in a magnetic field. For example, “Figure 1 is the effect of a magnetic field on a linear current. The direction of movement of the energized straight wire in this magnetic field is __.” Another example is “Figure 2 is the direction of the magnetic flux around a live wire, and the direction of current in the wire is _” _.” These two questions many students will get “up” answers. One of the reasons students have made this mistake is that we have no notes in teaching