事实上，如果你观察带电粒子，在点电荷引起的电场中的运动，它也满足开普勒第二定律。
So, actually, if you look at motion of charged particles in an electric field caused by a point charged particle, it also satisfies Kepler's law, satisfies the same law.
本文分析了带电粒子在匀强电场、匀强磁场、复合场中的运动。
The motion of charged particle in uniform electrical field, uniform magnetic field and complex field is analysed in this paper.
简要分析了在考虑重力作用的情形下，带电粒子在恒定磁场和振荡电场中的运动状态，求得了其运动方程，并就拉莫频率和振荡频率的关系进行了讨论。
The motion equation of the moving charged particle is obtained, and the relation between the Lamor frequency a and the oscillation frequency wis discussed as well.
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