避开矢量分析推导磁场能量密度公式

DERIVATION OF THE MAGNETIC FIELDIS ENERGY DENSITY FORMULA WITHOUT VECTOR ANALYSIS

本文避开矢量分析，引入通量管概念，应用场元方法，推导磁场能量密度的普遍表达式．方法简单，意义显明．

his paper avoids the vector analysis Adopting the concept of flux tube and using the method of field unit,we derive a general formula for the energy density of the magnetic field.The method is simple and the meaning is manifest.