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匀强磁场中的电荷单摆在中学物理中不乏其例。近年来,一些参考书或基础训练,对此类问题出现、命题解题都有失误的现象。且资料四处流传,贻害非浅。因此,剖析一下这些错题与错解,探讨匀强磁场中电荷单摆的命题条件,诚感必要。命题1.如图1,用长l的细线一质量m,带电量-q的小球,线另一端悬于O点,把小球拉到与O点相平位置并使线伸直,后让小球摆下,试讨论小
The monopole pendulum in a uniform magnetic field has no shortage of examples in the middle school physics. In recent years, some reference books or basic training have made mistakes in the appearance of such problems and propositions. And the information spreads everywhere, and the harm is very serious. Therefore, it is necessary to analyze these misunderstandings and misunderstandings and discuss the propositions of the charge pendulum in a uniform magnetic field. Proposition 1. As shown in Figure 1, with a thin line of length l, a mass m, a ball with a charge of -q, the other end of the line is suspended at point O, and the ball is pulled to a level position with point O and the line is straightened. After the ball is dropped, try to discuss the small