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初中物理课本第二册P119图7-2、图7-3的“两种电荷及电荷间相互作用”的演示实验中,是把带电的玻璃棒和橡胶棒分别用细线吊起来。本人作如下改进:(1)用有机玻璃直尺(学生用)取代玻璃棒,用普通塑料直尺(学生用)取代橡胶棒;(2)取一只废灯泡和一个略小于灯泡玻璃球部的纸盒或其它容器,把灯泡倒立在这纸盒中(如图所示);(3)把带电的有机玻璃直尺或普通塑料直尺平放在灯泡上,另一根直尺可用手拿着去靠近它。这样改
In the demonstration experiment of the “Interaction Between Two Charges and Charges” in Figure 7-2 and Figure 7-3 in the second volume of the junior high school physics textbook P119, the charged glass rod and rubber rod are respectively suspended by thin lines. I made the following improvements: (1) Replace the glass rod with a plexiglass ruler (for students), replace the rubber rod with an ordinary plastic ruler (for students); (2) Take a waste bulb and a glass bulb slightly smaller than the bulb The paper box or other container, the light bulb upside down in the tray (as shown); (3) the charged plexiglass ruler or ordinary plastic ruler flat on the light bulb, another ruler can use the hand Hold it close to it. This change