Electrophoresis Display Density Field 电泳显示密度域 energy density of electromagnetic field 电磁场的能量密度 Lagrangian density of electromagnetic field 电磁场的拉格朗日量密度 ..
This passagebases on electromagnetic field theories, analyzes the physicalmeaningsof electromagnetic energy densityfrom the standpoint of interactions betweenfieldsandmedium.