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1.心脏图例1 如图1所示,以 ab 为分界面的两个匀强磁场,方向均垂直于纸面向里,其磁感应强度B_1=2B_2=B,现有一质量为m,电荷量为+q 的粒子,从 O 点
1. Heart diagram 1 As shown in Figure 1, two homogeneous magnetic fields with ab as the interface are perpendicular to the paper surface. The magnetic induction intensity B_1=2B_2=B, the existing mass is m, and the charge is + q particles, from O point