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分析和计算电磁感应产生的电动势的大小和方向,有两个计算大小的公式E=Blvsinθ和E=△φ/△t,有两种判断方向的方法右手定则和楞次定律.其中公式E=Blvsinθ和右手定则用于计算一段导体切割磁感线产生感应电动势时较方便,公式E=△φ/△t和楞次定律用于计算一个闭合电路中磁通量发生变化产生感应电动势时较方便.因此,有关电磁感应的问题,首先要确定和分析好研究对象是杆还是回路,其次要选对是符合杆还是回路的规律和方法.
Analyze and calculate the magnitude and direction of the electromotive force generated by electromagnetic induction. There are two formulae for calculating E=Blvsinθ and E=△φ/Δt. There are two ways to determine the direction: right-hand rule and Lenz’s law. Formula E =Blvsinθ and the right-hand rule are more convenient for calculating the induced electromotive force generated by cutting a magnetic induction line in a section. The formulae E=Δφ/Δt and Lenz’s law are more convenient for calculating the induced electromotive force generated by a change in magnetic flux in a closed circuit. Therefore, regarding electromagnetic induction, we must first determine and analyze whether the object of study is a rod or a loop, and secondly, whether the selected pair is in accordance with the law or method of rod or loop.