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(2009年海南高考第16题)如图1所示,ABCD是边长为a的正方形,质量为m、电荷量为e的电子以大小为v0的初速度沿纸面垂直于BC边射入正方形区域.在正方形内适当区域中有匀强磁场,电子从BC边上的任意点射入,都只能从A点射出磁场.不计重力,求:⑴此匀强磁场区域中磁感应强度的方向和大小
(Hainan college entrance examination in 2009 No. 16) As shown in Figure 1, ABCD is a side of a square length, mass m, the amount of charge e electrons at an initial velocity v0 along the paper surface perpendicular to the incidence of BC Square area: There is a uniform magnetic field in the appropriate area of the square, and the electrons are injected from any point on the edge of BC, and the magnetic field can only be emitted from point A. Regardless of gravity, find: (1) The direction of magnetic induction in this uniform magnetic field And size