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在研究磁场和电磁感应习题中,常见带电小球或金属棒由于加速变化而做变加速运动最后达到稳定状态的情况。利用e~(kx)函数图象研究将更清楚地看出物体运动状态的变化。下面举例说明: 例1、套在很长的绝缘直棒上带正电的小球质量为0.1克,电量为4.0×10~(-4)库,小球可在棒上滑动,将此棒放在互相垂直的匀强电场(E=10牛/库)和匀强磁场(B=0.5特)中(图1),小球与棒间滑动摩擦系数为0.2,试分析小球的运动状态及其沿棒竖直下滑时可达到的最大速度(设小球运动中所
In the study of magnetic fields and electromagnetic induction exercises, it is often the case that a charged ball or metal rod undergoes accelerated acceleration motion and eventually reaches a steady state. Using the e~(kx) function image study will more clearly see the changes in the motion state of the object. The following examples illustrate: Example 1, set on a long insulated straight rod with a positive charge of 0.1g, the power of 4.0 × 10 ~ (-4) library, the ball can slide on the rod, the rod Place in a uniform vertical electric field (E=10 N/house) and a uniform magnetic field (B=0.5 Te) (Fig. 1). The coefficient of sliding friction between the ball and the bar is 0.2. Analyze the movement of the ball. And the maximum speed that can be reached when it slides down the bar