许多人都将空心磁铁内部的磁场当螺线管来处理 ,以为其内部的磁场方向与螺线管一样 ,是从Ｓ极到Ｎ极 ,真是这样吗 ?图 1先从理论来分析 .根据安培分子环流假设 ,空心磁铁横截面的分子电流如图 1 ,磁铁实体内部的分子电流相互叠加抵消 ,只剩下内外表面的电流Ｉ内 和Ｉ外 ,且Ｉ内 Many people treat the magnetic field inside a hollow magnet as a solenoid, so that the direction of its internal magnetic field is the same from the S pole to the N pole. Is this true? Figure 1 first analyzes the theory. According to Ampere The molecular circulation assumes that the molecular current of the cross-section of the hollow magnet is as shown in Fig. 1. The molecular currents inside the magnet body are mutually superimposed and canceled, leaving only the inner and outer surfaces of the current I and I, and I