一根没有标明磁极的条形磁铁不小心跌成两段后 ,欲把它恢复原状 ,可是断口处却产生了推斥力 ,使它们难以相互靠近 ,产生这种现象的原因是什么呢 ?下面我们从条形磁铁的构造来分析 .条形磁铁的构造一般分为图 1和图 2所示的两种 .图 1　　　　　　　　图 2图 3　　图 1所示的条 A bar magnet without an indicated magnetic pole accidentally fell into two parts and tried to restore it to its original shape. However, the fractured part had a repulsive force, making it difficult to get close to each other. What is the reason for this phenomenon? Analyze from the structure of the bar magnet. The structure of the bar magnet is generally divided into two types shown in Figure 1 and Figure 2. Figure 1 Figure 2 Figure 3 Figure 1 shows the bar