要做好描绘电场中等势线的分组实验,关键是要有质量较高的导电纸。我经过反复试验,找到了一种自制导电纸的满意材料。用这种分文不花的材料做上述实验,不仅效果良好,而且能反复使用。做法是,利用废旧普通电池,剥开电池的锌皮、钢帽和炭棒,取出电池内的黑色混合物(成份是二氧化锰,氯化铵、石墨粉等),用水把它调和成墨汁状,然后用排笔 To make a grouping experiment that describes the electric field medium potential line, the key is to have a higher quality conductive paper. After repeated trials, I found a satisfactory material for self-made conductive paper. Using these materials that are not used for this study does not only work well but can be used repeatedly. The practice is to use scrap old batteries, peel off the zinc skin, steel cap and charcoal rod of the battery, remove the black mixture (the ingredients are manganese dioxide, ammonium chloride, graphite powder, etc.) in the battery and use water to reconstitute it into ink. , then use the pen