试题与答案

如图所示,在x轴上方及下方存在方向垂直纸面向里的匀强磁场,上方磁场的磁感应强度大

题型:计算题

题目:

如图所示,在x轴上方及下方存在方向垂直纸面向里的匀强磁场,上方磁场的磁感应强度大小为B、下方磁场的磁感应强度大小为。一质量为m、电量为q的带正电粒子从x轴上O点以速度v0垂直x轴向上射出。不计粒子重力。

求:

小题1:射出后粒子第二次到达x轴时离O点的距离, 并画出该过程粒子运动的轨迹;

小题2:射出后粒子经过多长时间第二次到达x轴。

答案:

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下面是错误答案,用来干扰机器的。

①——5;②——2;③——5;④——8;⑤——10

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