等量异号双环电荷在轴线上产生匀强电场条件的研究  

Study on the Condition of Uniform Electric Field Produced by Equal Number of Double Ring Charges of Different Sign Along the Axis

作　　者：周群益 莫云飞 侯兆阳[3] 周丽丽[4] Zhou Qunyi;Mo Yunfei;Hou Zhaoyang;Zhou Lili(College of Genenal Education,Guangzhou Institute of Science and Technology,GuangZhou,Guangdong 510540;School of Electronic Information and Electrical Engineering,Changsha University,Changsha,Hunan 410022;School of Science,Chang′an University,Xi′an,Shannxi 710064;School of Medical and Information Engineering,Gannan Medical University,Ganzhou,Jiangxi 341000)

机构地区：[1]广州理工学院通识教育学院,广东广州510540 [2]长沙学院电子信息与电气工程学院,湖南长沙410022 [3]长安大学理学院,陕西西安710064 [4]赣南医学院医学信息工程学院,江西赣州341000

出　　处：《物理通报》2021年第8期15-18,共4页Physics Bulletin

基　　金：广东省高校科研特色创新项目,项目编号:2020KTSCX209;国家自科基金,项目编号:12004053。

摘　　要：与亥姆霍兹线圈产生的匀强磁场类似,等量异号共轴双环电荷在一定的条件下也能在轴线上产生匀强电场,这种双环称为临界双环或亥姆霍兹双环.文中建立了双环电荷在直角坐标系中的轴线上产生电场强度的表达式,求出临界距离,计算临界场强,绘制了双环电荷的电场强度变化规律曲线.Being simular with the uniform magnetic field produced by Helmholtz coils,uniform electric field can be produced by two coaxial rings with positive and negative charges.This system is called Helmholtz ring.The analytical formulars of its electric field on the axis is derived,and the critical distance between the two rings is obtained where the electric field is nearly uniform.Moreover,the change feature of electric field for the Helmholtz ring is visualized by means of Matlab.

关 键 词：双环电荷 电场强度 临界距离 临界双环 

分 类 号：O441[理学—电磁学]