试题与答案

如图所示的区域中,左边为垂直纸面向里的匀强磁场,磁感应强度为B,右边是一个电场强

题型:计算题

题目:

如图所示的区域中,左边为垂直纸面向里的匀强磁场,磁感应强度为B,右边是一个电场强度大小未知的匀强电场,其方向平行于OC且垂直于磁场方向。一个质量为m、电荷量为-q的带电粒子从P孔以初速度V0沿垂直于磁场方向进入匀强磁场中,初速度方向与边界线的夹角θ=60°,粒子恰好从C孔垂直于OC射入匀强电场,最后打在Q点,已知OQ=2OC,不计粒子的重力,求:

(1)粒子从P运动到Q所用的时间t;

(2)电场强度E的大小;

(3)粒子到达Q点时的动能EkQ

答案:

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