开普勒第三定律:所有行星轨道的半长轴的三次方与它的公转周期的二次方的比值都相等,即a~3/T~2=k,比值k是一个对所有行星都相同的常量.由于库仑力与万有引力均遵循“平方反比”规律,类比可知,带点粒子在电场中的椭圆运动也遵循开普 Kepler’s third law: all planetary orbit semi-major axis of the third power and its cycle of the quadratic ratio are equal, that is, a ~ 3 / T ~ 2 = k, the ratio k is a planet for all The same constant. Since Coulomb’s force and universal gravitation follow the law of “square inverse”, the analogy shows that the elliptical motions of the particle with particles in the electric field also follow the trend of the Cape