涉及电磁感应的力电综合问题,在高考试题中经常作为压轴题出现,分值高,综合程度大,难度也大.这类问题有两种常见情境,一是金属棒与导轨组成闭合电路,闭合电路处在匀强磁场中,金属棒或导轨做切割磁感线运动产生感应电流,二是闭合电路所围面积不变,穿过其中的磁场的磁感应强度变化产生感应电流.问题的分析求解,往往涉及法拉第电磁感应定 Electromagnetic induction involving the power of comprehensive problems in the entrance exam questions often appear as a finale, high scores, a large degree of integration, the difficulty is also large.This kind of problem has two common situations, one is composed of metal bars and rails closed circuit, Closed circuit in a uniform magnetic field, the metal rod or rail to do induction cutting magnetic induction line current, and second, the area enclosed by the closed circuit unchanged, the magnetic field through which the magnetic induction intensity changes in the induction current. , Often involving Faraday’s electromagnetic induction set