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电磁感应中导轨问题不仅考查学生对法拉第电磁感应定律、楞次定律、安培力计算公式的掌握情况,而且检验学生是否能熟练地应用牛顿运动定律、动能定理、机械能守恒定律和能量守恒定律,对学生的能力要求较高,其中的双杆问题极易导致学生失分。常把回路中只有一根导体棒称作单棒模型,若两根则称作双杆模型。本文旨在对单棒动态分析的规律方法进行总结和运用,将双杆模型转换为基本单棒模型,用单棒模型的规律方法求解双杆问题。
The problem of guide rail in electromagnetic induction not only examines students’ grasp of Faraday’s law of electromagnetic induction, Lenz’s law and ampere force, but also tests whether students can skillfully apply Newton’s law of motion, kinetic energy theorem, law of conservation of mechanical energy and law of conservation of energy. The students’ ability requirements are higher, and the double-pole problem can easily lead to students losing points. Often only one conductor rod in the loop is called a single rod model, and if two are called double rod models. The purpose of this paper is to summarize and apply the regular method of single-rod dynamic analysis. The double-rod model is transformed into the basic single rod model and the double rod problem is solved by the regular method of single rod model.