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高中物理第二册204页的第5题:“图16-30中的A 和 B 部足两个很轻的铝环,环 A 是闭合的,环 B 是断开的,用磁铁的任一极去接近 A 环,会产生什么现象?把磁铁从 A 环移开,会产生什么现象?磁铁移近或远离 B环时,又会产生什么现象?解释所发生的现象。”对于这道题,有一部分学生到实验室找仪器做实验,结果有的学生发现 B 环也有运动,只是运动的幅度比 A 环的小些而已,这样就与教学参考书上的答案发生矛盾。当学生问我这个问题到底该如何解释时,我说:“B 环有运动也
High School Physics Volume II, page 204, item 5: “A and B in Figures 16-30 have two very light aluminum rings, ring A is closed, ring B is broken, and either one of the magnets is used. What happens when you go near the A ring? What happens when you move the magnet away from the A ring? What happens when the magnet moves closer or farther away from the B ring? Explain what happened.” For this question Some students went to the lab to find instruments to do experiments. As a result, some students found that the B-ring also had movements, but the movement range was smaller than that of the A-ring. This contradicted the answer in the teaching reference book. When the students asked me how to explain this problem, I said: “B ring has sports