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题如图1所示,质量为m的小球带电量为q,在场强为E的水平匀强电场中以竖直向上的初速度v0抛出.若忽略空气阻力,求小球在这样足够大的电场中运动时的最小速度.
The problem is shown in Fig. 1. The mass of the ball with a mass of m is q, and is thrown at a vertical upward initial velocity v0 in a horizontal uniform electric field with a field strength of E. If the air resistance is ignored, find the ball in this way The minimum speed of motion in a sufficiently large electric field.