带电粒子在电磁场中的运动,是物理学科内综合的重点问题.因为它既综合了电学、力学知识,又有实际应用,如示波器、电视机、回旋加速器等. 例1 长为l,相距为d的两平行金属板A、B与一电源相连,如图1所示.一质量为m, The movement of charged particles in the electromagnetic field is a key issue in the synthesis of physics because it integrates both electrical and mechanical knowledge as well as practical applications such as oscilloscopes, televisions, and cyclotrons, etc. Example 1 has a length of 1 and a distance of d of the two parallel plates A, B and a power supply, as shown in Figure 1. A mass of m,