正弦交变电流虽然在教材中所占的比重不大,但由于它与磁场密切关联,特别是交变电流的产生,涉及众多知识要点,已成为高考命题的一个切入点.现将高中阶段交变电流的产生方法加以归类汇总,以飨读者.1　单向平动切割法图1例1 .( 2 0 0 3上海高考物理题)如图1所示,OACO为置于水平面 Although sinusoidal alternating current accounts for a small proportion in teaching materials, it is closely related to the magnetic field, especially the generation of alternating currents, which involves many points of knowledge and has become an entry point for college entrance examination propositions. The generation method of the variable current is classified and summarized to the reader. 1 One-way translational cutting method Figure 1 Example 1 (2 0 3 3 Shanghai college entrance examination physics problem) As shown in Figure 1, OACO is placed on the horizontal plane