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现行教材在“电磁感应现象”一节中,以回顾法拉第实验思路的形式,给出了感生电流的产生条件.其中有这样一段话: “B(线圈)所在处的磁场变化,也就是穿过线圈的磁力线条数,即磁通量,发生了变化.”“所以,感生电流的产生条件可以归结为穿过线圈的磁通量发生变化.”(乙种本下册 122页) 换句话说,磁场变化就是磁通量变化.磁场变化产生的电流,也就可以说是磁通量变化引起的.这是否就是法拉第当年的思路,笔者尚未查到出处.即便是,照搬到中学课堂也未必合适.从逻辑上说,关于感生电流
The current teaching material in the section “Electromagnetic Induction Phenomenon”, in the form of a review of Faraday’s experimental ideas, gives the conditions for the generation of induced currents. There is such a paragraph: “The magnetic field of B (coil) changes, that is, The number of magnetic lines passing through the coil, that is, the magnetic flux, has changed.“ ”So, the induced current generation condition can be attributed to a change in the magnetic flux passing through the coil." (B. 122.) In other words, the magnetic field The change is the change of magnetic flux. The current generated by the magnetic field change can be said to be caused by the change of magnetic flux. Whether this is Faraday’s idea of the year, the author has not yet found the source. Even if it is, it may not be appropriate to copy to the middle school class. Logically, , about induced current