专题九 带电粒子在叠加场中的运动
专题九带电粒子在叠加场中的运动返回返回立足立足““四翼四翼””探考点探考点课时跟踪检测课时跟踪检测返回返回立足“四翼”探考立足“四翼”探考点点返回返回考点一带电粒子在叠加场中的运动[互动共研类]1．三种场的比较洛伦兹力不做功，不改变带电粒子的动能大小：F＝qvB(v⊥B)方向：可用左手定则判断磁场电场力做功与路径无关，W＝qU＝qEd电场力做功改变电势能大小：F＝qE方向：正电荷受力方向与场强方向相同，负电荷受力方向与场强方向相反电场重力做功与路径无关重力做功改变物体的重力势能大小：G＝mg方向：竖直向下重力场功和能的特点力的特点返回返回2．“三步”解决问题返回返回[例1]如图，空间某区域存在...
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