洛仑兹力实验教学演示仪的改进
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摘要
对传统的"旋转的液体"实验进行改进,研制出洛仑兹力实验教学演示仪,通过变压器将220V交流电转化为直流电,使通电线圈产生竖直方向的磁场,同时电解槽电解产生OH~-,在电场作用下定向移动时,由于受到洛仑兹力的作用而发生旋转,并使用酚酞作为指示剂,将无色的微观实验现象转换为宏观的红色可视化现象,极大地增加了学生学习的兴趣.
A demonstrator for Lorentz force experiment teaching was designed to realize qualitative research using simple materials.In the improved experimental device,220 V AC current was converted into DC current,so that the electrified coil produced a vertical magnetic field.At the same time,the electrolytic cell produced hydroxy radical which rotated because of the Lorentz force when it moved under the action of the electric field.The colorless microscopic experimental phenomenon was transformed into a macroscopic red visible phenomenon by using phenolphthalein as the indicator.It greatly increased the students’ learning interests.
A demonstrator for Lorentz force experiment teaching was designed to realize qualitative research using simple materials.In the improved experimental device,220 V AC current was converted into DC current,so that the electrified coil produced a vertical magnetic field.At the same time,the electrolytic cell produced hydroxy radical which rotated because of the Lorentz force when it moved under the action of the electric field.The colorless microscopic experimental phenomenon was transformed into a macroscopic red visible phenomenon by using phenolphthalein as the indicator.It greatly increased the students’ learning interests.
引文
[1]周亮.洛伦兹力宏观演示仪的制作[J].中学物理,2011,29(5):25-26.
[2]刘庭华.洛伦兹力宏观演示仪的制作可以更简单[J].中学物理,2012,30(1):35.
[3]吴一.利用电解法演示洛仑兹力[J].实验教学与仪器,1997(1):25.
[4]李艳.对洛伦兹力演示仪的改进[J].中学物理,2018,36(5):46.
[5]肖凯龙,庄浩丽.洛伦兹力可视化演示仪[J].物理实验,2017,37(10):60-61.
[6]何欣灿.自制“洛伦兹力演示仪”[J].实验教学与仪器,2015,32(9):52-53.
[2]刘庭华.洛伦兹力宏观演示仪的制作可以更简单[J].中学物理,2012,30(1):35.
[3]吴一.利用电解法演示洛仑兹力[J].实验教学与仪器,1997(1):25.
[4]李艳.对洛伦兹力演示仪的改进[J].中学物理,2018,36(5):46.
[5]肖凯龙,庄浩丽.洛伦兹力可视化演示仪[J].物理实验,2017,37(10):60-61.
[6]何欣灿.自制“洛伦兹力演示仪”[J].实验教学与仪器,2015,32(9):52-53.