关于“电磁场导论”课程中的两点讨论

Discussion of Problems in Course of An Introduction to Electromagnetic Fields

结合“电磁场导论”课程教学中遇到的问题,指出有关球面镜像、电场能量计算的两点看法。为灵活运用球面镜像法,建议将镜像电荷q″置于导体球面上。为免除采用电位积分式计算电场能量时,电位参考点选取的困惑,明确指出该公式的使用条件为静电独立系统。上述建议仅供大家参考。

Associating problems encountered in teaching of an introduction to electromagnetic fields, two viewpoints concerning spherical mirror method and calculation of electric field energy are pointed out. In order to use spherical mirror method, it's advised to put mirror electric charge q ″ on the surface of the conductor global. To free from the puzzle of electric potential reference point selection during calculating electric field energy by integral equation of electric potential, it's needed to point out explicitly that the condition of using this integral equation is electrostatic stand-along system. Above suggestions are references for teachers engaged in electromagnetic field theory.