如图所示有一弯管ab其中心线是半径为r的一段圆弧弧的圆心处有一个点电荷q有一束带负电的粒子流从a端的中点射入恰能沿中心线通过弯管的 Template




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tomski如图所示有一弯管ab其中心线是半径为r的一段圆弧弧的圆心处有一个点电荷q有一束带负电的粒子流从a端的中点射入恰能沿中心线通过弯管的 coloring