1问题的由来人教版《物理》选修3-2“互感和自感”中的自感现象演示实验,目的是为了说明当线圈中的电流发生变化时,线圈会产生自感电动势.教材中设计的通电自感和断电自感实验已经几十年了,随着社会的发展和科学技术的进步,有必要对它做一改进,使实验更简单,现象更加直观、明显 The origin of the problem People PEP “Physics” Elective 3-2 “Mutual inductance and self-inductance,” the demonstration of self-inductance phenomenon experiment, the purpose is to illustrate that when the current in the coil changes, the coil will produce a self-induced electromotive force. It has been several decades since the design of power-on self-inductance and power-off self-inductance experiment, with the social development and scientific and technological progress, it is necessary to make an improvement on it, make the experiment more simple, the phenomenon more intuitive, obvious