(10 磁场)11 带电粒子在电、磁组合场中运动(原卷)
【带电粒子在电、磁组合场中运动】1、如图所示,在坐标系的第二象限内有沿轴正向的匀强电场,在第一、三、四象限有垂直于坐标平面向外的匀强磁场,质量为m、电荷量为q的带正电粒子在轴上的P(-d,0)点,以大小为的初速度沿轴正方向射入匀强电场,结果粒子从轴上的Q点射入磁场,粒子经过磁场偏转后,以垂直于轴的方向第二次进入电场,不计粒子的重力,求:(1)匀强电场的电场强度大小及匀强磁场的磁感应强度的大小;(2)粒子从点射出到第三次经过y轴时所用的时间;(3)若粒子第二次经过y轴时撤去磁场,试确定粒子第三次经过y轴的位置坐标。2、如图所示,在边界OP、OQ之间存在竖直向下的匀强电场,直角三角形abc区域内存...
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