可电磁学0101：电荷 有京大赞 静电感应(electrostatic induction) Insulating nylon threads and a positively A negatively charged charged glass rod plastic rod now repels Charged attracts the ball. the ball... plastic roc Metal Copper Charged Charged ball wire plastic rod glass rod The wire conducts charge from the negatively charged plastic rod to the metal ball. Electron Electron buildup Metal deficiency ball Negatively X Wire XX Negative Insulating charge in stand ground Ground ▣ t视频：Rubber and Glass Rods with Tinsel and Balloon 电磁学01-01: 电荷  静电感应(electrostatic induction)  视频：Rubber and Glass Rods with Tinsel and Balloon