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在做《电磁铁》一课的演示实验中 ,我们往往会碰到一些出乎意料的实验结果。现象之一 :做“切断电流磁性消失”的实验时 ,发现 :虽然电流断开了 ,而电磁铁的铁芯仍然吸住小铁片。没有出现铁片马上掉下来的现象。解释 :电磁学中的磁化理论认为 :当磁性材料进入到某磁场中时 ,该
In the demo experiment of the “Electromagnet” lesson, we often encounter unexpected experimental results. One of the phenomena: When doing the experiment of “cutting off the magnetic current”, it was found that although the current was disconnected, the iron core of the electromagnet still absorbed the small iron piece. There was no evidence that the iron pieces fell immediately. Explanation: The magnetization theory in electromagnetism considers that when a magnetic material enters a magnetic field,