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题在边长为2a的正△ABC内存在垂直纸面向里,磁感强度为B的磁场,有一带正电q,质量为m的粒子从距A为3a的D点,垂直AB方向射入磁场.若粒子能从AC间离开磁场.求粒子的最大入射速度. 对于这道题,老师提供的解答是这样的:
In the positive △ABC with side length 2a, there is a magnetic field with a magnetic induction intensity of B in the positive ΔABC. The positive magnetic field has a positive charge q, and the particles of mass m are injected from the point D at A from 3A to the vertical AB direction. Magnetic field. If the particle can leave the magnetic field from AC. Find the maximum incident velocity of the particle. For this question, the teacher provides the answer: