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带电粒子在洛仑兹力作用下做匀速圆周运 动的问题一般有多解.形成多解的原因有: 1.带电粒子电性不确定 受洛仑兹力作用的带电粒子,可能带正电, 也可能带负电.当具有相同初速度时,正负粒子 在磁场中的运动轨迹不同,导致形成双解. 例1 如图1所示,第一象限范围内有垂 直于xOy平面的匀强磁场,磁感应强度为B.质 量为m,电量大小为q的带电粒子在xOy平面
The problem of charged particles doing uniform circular motion under the action of Lorentz force generally has multiple solutions. The reasons for the formation of multiple solutions are: 1. Charged particles are electrically charged particles that are electrically indeterminate by Lorentz force and may be positively charged. It may also be negatively charged. When having the same initial velocity, the trajectories of the positive and negative particles in the magnetic field are different, resulting in the formation of double solutions. Example 1 As shown in Figure 1, there is a uniform magnetic field perpendicular to the xOy plane in the first quadrant. The magnetic induction intensity is B. The mass is m, and the charged particle size q is the charged particle in the xOy plane.