【简答题】如图所示,匀强磁场的磁感应强度 B = 0.2 T ,磁场宽度 l = 4 m ,一正方形金属框边长为 l ′ = 1 m ,各边的电阻 r = 0.2 Ω ,金属框以 v = 10 m/s 的速度匀速穿过磁场区,其平面始终保持与磁感线方向垂直, cd 边始终与磁场边界平行 . 求: (1) 画出金属框穿过磁场区域的过程中,各阶段的等效电路图; (2) 画出金属框穿过磁场区域的过程中,金属框内感应...
【简答题】阅读理解。 Women have been scientific discoveries since ancient times. Twelve women have won the Nobel Prize for science, one of the highest honors in the world. Some women scientists never married,...