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1 原理洛仑兹力是磁场对运动电荷的作用力,其公式为:f=qvBsinθ,其中q为运动电荷的电量,v为该电荷运动的速率.因为这两者均属微粒所有,比较抽象,其结果为微粒受力f,我们也只能根据带电微粒受力作用的效果来判断力的存在、大小和方向.学生往往比较难于接受,而这一知识是高中物理的重点之一.本实验则是用洛仑兹力的宏观效果(溶液和纸条的旋转)去分析洛仑兹力的存在和规律.2 特点和用途
1 Principle The Lorentz force is the force acting on a moving charge by a magnetic field, and its formula is: f = qvBsinθ, where q is the charge of the moving charge and v is the rate of charge movement. Because both of these are particle-free, relatively abstract The result is that the particles are subjected to force f. We can only judge the existence, size and direction of the force based on the effect of charged particles. Students are often more difficult to accept, and this knowledge is one of the focuses of high school physics. The experiment uses the macroscopic effect of Lorentz force (the rotation of the solution and the paper strip) to analyze the existence and law of Lorentz force. 2 Features and uses