High school physics elective 3 bars 1 (electromagnetics). According to Baidu's educational information, the elective course of physics in senior high school is 3 bars 1 (electromagnetics), which is suitable for senior two students with weak mastery of electricity and mechanics. Wang Wenbo, a well-known physics lecturer in China, director of the Physics Teaching and Research Section of the College Entrance Examination Institute of Shutu Education, a high school physics teacher with Niu Xiaowu, a college entrance examination guidance expert, a special guest of "Face to Face Education" of Beijing Radio Station, and an analysis expert of college entrance examination questions invited by well-known domestic media such as Sohu, Sina and People's Daily.