本刊 2 0 0 4年第 1期所刊《一道电磁感应难题的图像巧解》一文 ,应用数学图像方法为突破口 ,结合微积分思想 ,通过数形结合求解 ,读后很受启发 .不过文中提到应用动量定理先求解线圈进入磁场阶段的末速度v1认为不可行 ,下面给出一种“微元累加法”作为补充 ,供大家参考 .图 1 In the first issue of “The Solving Image of Electromagnetic Induction Problems” published in the first issue of the magazine in 2004, the application of the mathematical image method as a breakthrough, combined with the concept of calculus, was solved by the combination of number and shape. After reading it, it was inspired. It is considered that applying the momentum theorem to solve the final velocity v1 of the coil entering the magnetic field phase is not considered feasible. The following gives a “micro accumulation method” as a supplement for your reference.