一、问题回顾洛伦兹力永不做功,这是不争的事实~([1]).如图1所示,水平面内光滑导管在静止的匀强磁场B中以v向右运动,初始时刻带正电小球q相对导管静止.文献~([1])讨论指出:某一时刻,静止于磁场的那个观察者来看,小球的绝对速度v_合其实是由v和相对导管的速度u合成的.那么,在观察者看 First, the problem review Lorentz force never work, it is an indisputable fact ~ ([1]). As shown in Figure 1, the smooth surface of the horizontal duct in the stationary uniform magnetic field B to v to the right, the initial moment In the literature ~ ([1]) the discussion states that at some point, observer resting at a magnetic field, the absolute velocity of the globule, v_u, is in fact determined by v and the relative conductance of the catheter Speed ​​u synthesized. Well, look at the viewer