高中物理甲种本第二册的学生分组实验《电场中等势线的描绘》,可用如下方法: (1) 如图所示,在桌面上自而下上依次铺上白纸、复写纸、薄塑料布,再把一张吸水性较强的纸(书法所用宣纸为最好)用水湿润透铺在塑料布上,然后把两个图钉按在湿纸上做为两个电极,图钉间要留适当距 High school physics A second volume of students grouping experiments “electric field medium potential line of drawing”, the following methods can be used: (1) As shown, from top to bottom on top of the table followed by white paper, carbon paper, thin plastic Cloth, and then a strong absorbent paper (calligraphy paper used for the best) wet with water through the shop in a plastic sheet, and then push the two thumbtacks on the wet paper as two electrodes, pins should be left between the appropriate distance