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左手定则和右手定则是中学物理“磁场”和“电磁感应”部分中的两个重要内容。学生在学习和运用这两个定则的过程中,由于这两个定则内容相似往往会将其混淆。为了帮助学生记忆并正确运用这两个定则,笔者在教学实践中,通过对左、右手定则进行比较和联想,启发、引导学生记忆和正确运用这两个定则。联想,是一种创造性的思维活动。联想能使脑神经细胞兴奋,在大脑皮层留下清晰的印迹,因而,记忆十分牢固。左手定则所判定的内容是与磁场力有关系的,我们可以认为它是一个与“力”有关的定则;右手定则所判定的内容是与感生电流(或感生电动势)有关的,我们可以认为它是一个与“电”有关的定则。我们将“力”字和“电”字做
The left-hand rule and right-hand rule are two important elements in the “magnetic field” and “electromagnetic induction” sections of middle school physics. In the process of learning and applying the two rules, students often confuse the two rules because of similar content. In order to help students remember and use these two rules correctly, in the teaching practice, through the comparison and association of the left and right hand rules, the author inspires and guides the students’ memory and the correct use of these two rules. Lenovo is a creative thinking activity. Lenovo can excite brain cells and leave a clear footprint in the cerebral cortex. Therefore, memory is very strong. The content determined by the left-hand rule is related to the force of the magnetic field. We can think of it as a rule related to “force”; the content determined by the right-hand rule is related to the induced current (or induced electromotive force). We can think of it as a rule related to “electricity.” We will make “force” and “electrical”