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电力线是人们为了形象地表示电场中场强的大小和方向而假想的线。做好这个实验是帮助学生正确认识电场的关键。高中物理电场一章(下册第10页)介绍的把奎宁或头发屑悬浮在蓖麻油里,再放电场中,就可看到微屑按照场强方向排列起来,形成电力线。但由于蓖麻汕比重小,不能使头发悬浮在油面而沉没在底部。因此,头发屑与器壁间阻力较大,电场力不易驱使它定向排列,故效果差。通过我们多次的实验教学实践认为,做好这个实验关键是要使液体的比重大于微屑的比
Power lines are lines that people imagine in terms of the magnitude and direction of the field strength in the electric field. Doing this experiment is the key to help students to correctly understand the electric field. High School Physical Electricity Chapter (Volume 10) describes the suspension of quinine or hair crumbs castor oil, and then discharge field, you can see the micro-debris arranged in accordance with the direction of the field strength to form a power line. However, due to the small proportion of castor-Shantou, hair can not be suspended in the oil and sink at the bottom. Therefore, the resistance between the hair debris and the wall larger, the electric field force is not easy to drive it to be oriented, so the effect is poor. Through our many experimental teaching practice that the key to doing this experiment is to make the proportion of liquid greater than the ratio of micro-crumbs