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人教版高中物理第三册 (选修本 )和新教材人教版高中物理第二册 (试验修订本 ,必修 ,必修加选修 )在“电磁感应”一章中都安排了下面这样的习题 :图 1如图 1 ,矩形区域CDEF中有匀强磁场 ,区域外没有磁场 .单匝铜线圈A从区域上方自由下落 ,试定性分析它在下落的不同阶段中的加速
PEP High School Physics Book 3 (selected edition) and the new teaching material PEP Senior Secondary Physics Book 2 (experimental revision, compulsory, compulsory and optional) are arranged in the chapter “Electromagnetic induction” as follows: Figure 1 As shown in Figure 1, there is a uniform magnetic field in the rectangular area CDEF, and there is no magnetic field outside the area. The single-copper coil A is free to fall from above the area, and the qualitative analysis of its acceleration in different stages of falling is qualitatively analyzed.