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导轨双棒切割磁感线运动类考题因其将受力分析和电路分析等知识天然结合在一起,所涉及的物理知识和规律较多,过程复杂,所以很好地考查学生的物理基本功底和逻辑推断能力而倍受各种考试命题者青睐。解决这类问题首先要建立一个“动→电→动”的思维顺序,基本方法和步骤可概括为: ①找准运动(切割)者用法拉第电磁感应定律和楞次定律求解电动势的大小和方向。 ②画好等效电路图,求解回路中电流大小及方向。 ③分析导体棒受力情况及导体运动后对电路中
The double-rod magnetic-magnetic-line-moving test questions for rails are naturally combined with knowledge of force analysis and circuit analysis. The physical knowledge and laws involved are numerous and the process is complicated. Therefore, the basic physical skills of students are well examined. Logic inference ability is favored by various test propositions. To solve this kind of problem, we must first establish a thinking sequence of “move→electricity→move”. The basic methods and steps can be summarized as follows: 1 Identify the motion (cutting) person Faraday’s law of electromagnetic induction and Lenz’s law Solve the magnitude and direction of the electromotive force . 2 Draw an equivalent circuit diagram to find out the current size and direction of the circuit. 3Analyze the stress condition of the conductor bar and the conductor in the circuit after moving