s11-3 Ampere's Law in a Medium 磁介质中的安培环路定理 1. The extension of two laws: Like the conduction current(传导电流) molecular current will produce the magnetic field For the magnetic medium, the gauss's magnetic law 手BaS=0 does not change; however, the Ampere's law fBd=A∑§11-3 Ampere’s Law in a Medium 磁介质中的安培环路定理 1. The extension of two laws: Like the conduction current （ 传导电流 ） , molecular current will produce the magnetic field。 For the magnetic medium, the Gauss’s magnetic law  = 0  S B dS   does not change; however, the Ampere’s law  B d = I 0    