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题目如图1所示,一位于竖直平面上的半径为R的圆形光滑绝缘轨道,其上半部分处于竖直向下、场强为E的匀强电场中,下半部分处于水平向里的匀强磁场中.质量为m,带正电量为q的小球从轨道的水平直径的M端由静止释放
The subject is shown in Figure 1, a circular smooth insulated track of radius R in a vertical plane, the upper half of which is vertically downward, the uniform electric field of E, the lower half of which is horizontal In a uniform magnetic field of mass m, positively charged q of the ball from the track of the horizontal diameter of the M-end by the static release