(10 磁场)8 圆形磁场内部入射(环形磁场)(原卷)
【圆形磁场内部入射(环形磁场)】两线一点1、真空中有一匀强磁场,磁场边界为两个半径分别为a和3a的同轴圆柱面,磁场的方向与圆柱轴线平行,其横截面如图所示。一速率为v的电子从圆心沿半径方向进入磁场。已知电子质量为m,电荷量为e,忽略重力。为使该电子的运动被限制在图中实线圆围成的区域内,磁场的磁感应强度最小为( )A.B.C.D.2、如图所示,环形区域内有垂直于纸面向外的匀强磁场,磁感应强度大小为,内圆半径为,外圆半径为,两圆的圆心(重合)处不断向外发射电荷量为,质量为的带正电粒子,不计粒子所受重力及粒子间相互作用,粒子发射速度方向都水平向右,而速度大小都不同,导致一部分粒子从外圆飞出磁场,而另...
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