微元法是高中物理中解决、分析问题的重要方法,在高考中微元法使用的频率很高,尤其是在变力做功问题、电磁感应中的动力学问题中微元法被广泛使用。带电粒子在有界磁场中运动的情境中,微元法也有其独特的妙用,解决问题时更常常有令人意想不到的便捷和效果。下面就高中物理中常见的两个问题如何使用微元法做简单的分析和尝试。例1、如图1所示,M、N、P为很长的平行边 Micro-element method is an important method to solve and analyze problems in high school physics. The use of the micro-element method in the college entrance examination is very frequent, especially in the work of variable force. The micro-element method is widely used in the dynamics of electromagnetic induction. In the case of charged particles moving in a bounded magnetic field, the microelements also have their unique magical power and often have unexpected and surprising conveniences and effects in problem solving. Here are two common high school physics problems how to use the micro-element method to do a simple analysis and try. Example 1, shown in Figure 1, M, N, P is a very long parallel sides