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带电粒子在周期性变化的电场中运动问题,是中学物理教学中的一个重点问题,同时也是高考中的热点问题。如,在1985年和1997年高考物理试题中,均以这类问题作压轴题。同学们在解答这类问题时,之所以普遍感到难,主要就是难在一个“变”字上。由于电场的变化,使得带电粒子在电场中的运动变得比较复杂,尤其是当变化电场中的某个参量又在变化时,粒子在电场中的运动就会具有多种可能性。如何在这多种错综复杂的运动情况中,挑选出我们解题时所需要情况,我想解题时的周密思考应该是最为关键的。只有有了周密的思
The movement of charged particles in a periodically changing electric field is a key issue in the physics teaching of middle schools, and it is also a hot issue in the college entrance examination. For example, in the 1985 and 1997 college entrance examination physics test questions, these issues were used as the finale. When classmates answer such questions, the general difficulty is that it is difficult to change the word. Due to the change of the electric field, the motion of the charged particles in the electric field becomes more complicated. Especially when a certain parameter in the changing electric field changes, the movement of particles in the electric field will have many possibilities. How to pick out the situations we need to solve problems in this variety of intricate and complex sports situations, and I think the thoughtful thinking should be the most critical. Only thoughtful thought