When and where a charged particle with given energy will enter or leave the magnetic field in a mass spectrometer, and how we use quantum mechanics to calculate them are interesting problems.
2
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。
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.
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