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楞次定律的文字表述,学生历来感到诘屈聱牙,难懂难记。教学时,可在做好课本第137页图4—14实验的基础上,归纳出四个图形,画在黑板上(如图所示)。
The written expression of Lenz’s law has always been a matter of students’ grievances and difficult to remember. In teaching, based on the experiments in Figure 4-14 on page 137 of the textbook, four figures can be summarized and drawn on the blackboard (as shown in the figure).