试题与答案

如图所示,电子从灯丝K发出(初速度不计),在KA间经加速电压U1加速后,从A板中

题型:计算题

题目:

如图所示,电子从灯丝K发出(初速度不计),在KA间经加速电压U1加速后,从A板中心小孔射出,进入由M、N两个水平极板构成的偏转电场, M、N两板间的距离为d,电压为U2,板长为L,电子进入偏转电场时的速度与电场方向垂直,射出时没有与极板相碰。已知电子的质量为m,电荷量为e,不计电子的重力及它们之间的相互作用力。求:

(1)电子穿过A板小孔时的速度大小v;

(2)电子在偏转电场中的运动时间t;

(3)电子从偏转电场射出时沿垂直于板方向偏移的距离y。

答案:

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