试题与答案

如图所示,a、b带等量异种电荷,MN为a、b连线的中垂线,现有一带电粒子从M点以

题型:多选题

题目:

如图所示,a、b带等量异种电荷,MN为a、b连线的中垂线,现有一带电粒子从M点以一定的初速度v射出,开始时的一段轨迹如图中实线所示,若不计重力的作用,则在飞越该电场的过程中,下列说法中正确的是(   )

A.该粒子带正电

B.该粒子的动能先减小后增大

C.该粒子的电势能先减小后增大

D.该粒子运动到无穷远处后,其速度大小一定仍为v

答案:

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