高中物理下册第143页导出了感生电动势的计算公式, ε=Blvsinθ接着有一段说明:“可见,在磁场中运动导线里感生电动势的大小,跟磁感应强度,导线长度,运动速度以及运动方向和磁力线方向的夹角的正弦成正比。”为了帮助学生理解这个公式的物理意义,掌握它的适用范围,提高学生应用这个公式解决实际问题的能力,在这一单元的教学中,可从易到难依次向学生提出以下问题。 High school physics booklet page 143 derived the formula for induced electromotive force, ε = Blvsinθ Then there is a paragraph: “Visible, in the magnetic field in the motion of the wire induces the size of the electromotive force, with magnetic induction, wire length, speed and The direction of movement is in direct proportion to the sine of the angle between the lines of magnetic force.”To help students understand the physical meaning of this formula, grasp its scope of application, and improve students’ ability to use this formula to solve practical problems, in this unit of teaching, You can ask the following questions from the students to the students.