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.
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。
2
The analytical expressions of the electromagnetic field generated by the DC electric dipole in the upper space for the two-layer mode were obtained by using the method of mirror image.