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原题:真空中一固定的点电荷Q(Q0),另有一粒子加速枪,可用同一加速电压加速各静止粒子,现有两种带负电粒子P1、P2,经该枪加速后进入Q场区域,枪口发射方向垂直于Q到枪口连线。(1)若粒子P1、P2进入Q场区域后能作匀速圆周运动,已知加速电压为U,求圆半径r0。(2)现用两支相同的枪,枪
The original title: a fixed point charge Q (Q0) in vacuum, and another particle acceleration gun that can accelerate the stationary particles with the same acceleration voltage. There are two kinds of negatively charged particles P1 and P2. After accelerating by this gun, they enter the Q field region. The muzzle firing direction is perpendicular to the Q-to-Muzzle connection. (1) If the particles P1 and P2 enter the Q-field region, they can make uniform circular motion. The known acceleration voltage is U, and the circle radius r0 is obtained. (2) Two identical guns and guns are used now