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图一是自感现象的一个演示电路:把一个小灯泡和一个带铁芯的线圈并联在一个直流电源上。关闭电键K,待小灯泡正常发光后,突然断开电键K,小灯泡并不立即熄灭,反而更亮的一闪,然后才迅速熄灭掉。这确实是一个生动的自感现象的演示实验。但有的同志在做这个演示实验时,却不易观察到“更亮的一闪”。那么,怎样才能把这个实验演示成功而又给予正确的解释呢?
Figure 1 shows a demonstration circuit of the self-inductance phenomenon: Connect a small light bulb and a coil with iron core in parallel on a DC power supply. Close the button K. After the light bulb is normally turned on, suddenly switch off the button K. The small light bulb does not immediately go out, but a brighter flash, and then quickly extinguishes. This is indeed a demonstration experiment of a vivid self-induction phenomenon. However, when some comrades did this demonstration experiment, it was not easy to observe a “brighter flash.” So, how can we demonstrate this experiment successfully and give correct explanation?