金属棒在导轨上运动问题既可以考查电磁感应知识,又可以考查电路知识,还可以考查力学规律,是历年高考的热点.解这类问题的关键点就是确定金属棒在导轨上运动时回路中电源的电动势,再确定金属棒所的安培力,运用相应的规律列出方程求解.这类问题看似各不相同,但总结起 The movement of metal rods on guide rails can not only examine the electromagnetic induction knowledge, but also can examine the circuit knowledge, and can also examine the laws of mechanics. It is a hot spot of the college entrance examination. The key point to solve this kind of problem is to determine the metal rod in the loop when the track moves. The electromotive force of the power source determines the ampere force of the metal rod and uses the corresponding laws to list the equations. This type of problem seems to be different, but it is