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全国高考理综卷Ⅱ第25题实际是一个有漏洞的错误题目,原题为:如图所示,在坐标系Oxy的第一象限中存在沿y轴正方向的匀强电场,场强大小为E。在其他象限中存在匀强磁场,磁场方向垂直纸面向里。A是y轴上的一点,它到坐标原点O的距离为h;C是x轴上的一点,到O的距离为l。一质量为m、电荷量为q的带负电的粒子以某一初速度沿x轴方向从A点进入电场区域,继而同过C点进入磁场区域,并在此通过A点,此时速度与y轴正方向成锐角。不计重力作用。试求:
The 25th problem of the National College Entrance Examination II is actually a flawed error title. The original title is: As shown in the figure, there is a uniform electric field along the positive direction of the y-axis in the first quadrant of the coordinate system Oxy. E. In other quadrants there is a uniform magnetic field, with the magnetic field oriented perpendicular to the paper. A is a point on the y-axis, its distance to the origin O of the coordinate is h; C is a point on the x-axis, and the distance to O is l. A negatively charged particle with mass m and charge q enters the electric field region from point A along the x-axis at an initial velocity, and then passes through point C into the magnetic field region, and passes through point A at this point. The positive direction of the y-axis makes an acute angle. Does not count gravity. Try to find: