关于几个磁学公式的适用范围

The applicable range of several magnetics formulas

用矢量场理论对磁场中的三个重要公式给予普遍意义上的证明,指明了三式成立的条件及内涵,进而使三个公式的适用范围得以拓宽.

By using theory of vector field, evidences to three important formulas of magnetism are proved, the applicable conditions and implications of them are pointed out, and thus widens the applicable range of these formulas.\;