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带电粒子的电、磁偏转问题在《考纲》中是Ⅱ级要求,也是历年高考考查的重点和热点.处理电偏转的基本思路与处理平抛运动的思路完全相同,处理磁偏转的基本思路是“画草图、找圆心、定半径”.下面介绍带电粒子电、磁偏转的五种情形.1.两次电偏转分别引起 x、y 偏移例1.从阴极 K 发射出的电子经电势差为 U_0=5000V 的电场加速后,沿平行于板面的方向射入两
The problem of electric and magnetic deflection of charged particles in the “Syllabus” is a requirement of Grade II, which is also the focus and focus of examinations in previous college entrance examinations. The basic idea of handling electric deflection is exactly the same as the idea of dealing with throwing motion. The basic idea of dealing with magnetic deflection is “Draw a sketch, find the center of a circle, set a radius”. Here are five cases of charged particles and magnetic deflections of a charged particle. 1. Two deflections of electrons cause x and y shifts respectively. Example 1. Electrons emitted from a cathode K After the electric field with a potential difference of U_0=5000V has been accelerated, two shots are injected parallel to the board surface.