例题如图1所示,环状匀强磁场围成的中空区域,具有束缚带电粒子的作用,中空区域中的带电粒子只要速度不大,都不会穿出磁场的外边缘,设环状磁场的内半径 R_1=0.5 m,外半径 R_2=1.0 m,磁场的磁感应强度 B=1.0 T.若被束缚的带电粒子的比荷为q/m=4×10~7C/kg,中空区域中 The example shown in Figure 1 shows that the hollow region enclosed by the ring-shaped uniform magnetic field has the function of binding charged particles. As long as the charged particles in the hollow region are not very fast, they will not pierce the outer edge of the magnetic field. The inner radius R_1 = 0.5 m, the outer radius R_2 = 1.0 m, the magnetic field strength of the magnetic field B = 1.0 T. If the bounded charged particles have a specific charge of q/m = 4 × 10 7 C/kg, in the hollow area