当前位置:首页>文档>专题67带电粒子在叠加场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

专题67带电粒子在叠加场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

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专题67带电粒子在叠加场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题67带电粒子在叠加场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题67带电粒子在叠加场中的运动_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

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专题 67 带电粒子在叠加场中的运动 1.(多选)如图所示,两个半径相同的半圆形轨道分别竖直放在匀强电场和匀强磁场中, 轨道两端在同一高度上,轨道是光滑的,两个相同的带正电小球同时从两轨道左端最高点 由静止释放,M、N为轨道的最低点,以下说法正确的是( ) A.两小球到达轨道最低点的速度v =v M N B.两小球到达轨道最低点时对轨道的压力F >F M N C.小球第一次到达M点的时间大于到达N点的时间 D.在磁场中小球能到达轨道的另一端,在电场中不能 2.(多选)如图所示,匀强磁场垂直于纸面向里,匀强电场平行于斜面向下,斜面是粗 糙的.一带正电物块以某一初速度沿斜面向上滑动,经a点后到b点时速度减为零,接着 又滑了下来.全程物块一直受摩擦力,设物块所带电荷量保持不变,则从 a到b和从b回 到a两过程相比较( ) A.加速度大小相等 B.由b到a的过程中摩擦产生的热量更多 C.由a到b的时间小于从b回到a的时间 D.动能变化量的绝对值相同 3.[2022·山东德州市期中]如图所示,一带电液滴在相互垂直的匀强电场和匀强磁场中 刚好做匀速圆周运动,其轨迹半径为 R.已知电场的电场强度大小为E,方向竖直向下;磁 场的磁感应强度大小为B,方向垂直于纸面向里.不计空气阻力,重力加速度为g,则下列 说法中正确的是( ) A.液滴带正电 B.液滴的比荷= C.液滴的速度大小v= D.液滴沿逆时针方向运动 4.[2022·山东临朐县练习]如图,在竖直平面内建立直角坐标系xOy,其第一象限存在 着正交的匀强电场和匀强磁场,电场强度的方向水平向右,磁感应强度的方向垂直纸面向 里.一带电荷量为+q、质量为m的微粒从原点出发沿与x轴正方向的夹角为45°的初速度 进入复合场中,正好做直线运动,当微粒运动到A(l,l)时,电场方向突然变为竖直向上(不 计电场变化的时间),粒子继续运动一段时间后,正好垂直于y轴穿出复合场.不计一切阻力,求: (1)电场强度E和磁感应强度B的大小; (2)粒子在复合场中的运动时间. 5.如图所示,位于竖直平面内的坐标系xOy,在其第三象限空间有垂直于纸面向外的 匀强磁场,磁感应强度大小为B=0.5 T,还有沿x轴负方向的匀强电场,场强大小为E=2 N/C.在其第一象限空间有沿y轴负方向的、场强大小也为E的匀强电场,并在y>h=0.4 m 的区域有磁感应强度也为B的垂直于纸面向里的匀强磁场.一个带电荷量为 q的油滴从图 中第三象限的P点得到一初速度,恰好能沿PO做匀速直线运动(PO与x轴负方向的夹角为 θ=45°),并从原点O进入第一象限.已知重力加速度g=10 m/s2,问: (1)油滴在第三象限运动时受到的重力、电场力、洛伦兹力三力的大小之比; (2)油滴在第一象限运动的时间. 6.[2022·广东省联考三]如图所示,半径R=0.5 m的竖直粗糙绝缘圆弧轨道ABC的最 低点C的切线呈水平,C点正下方为绝缘竖直墙壁,墙壁足够高.虚线 MN为C点下方的 场分界线,与C点的高度差h=0.1 m,MN上方区域内存在电场强度大小为E=100 V/m的 1 匀强电场,方向竖直向下,MN下方、墙壁左侧的区域内存在垂直于纸面向里的匀强磁场 和竖直向上的电场强度大小为E =200 V/m的匀强电场.一质量m=2×10-2 kg、电荷量q 2 =1×10-3 C的带正电小滑块自圆弧轨道上的B点由静止释放,经过C点时对轨道的压力 大小为F=0.34 N,从C点水平飞出后经分界线MN上的D点(图中未画出)进入下方区域. 已知OB连线与竖直方向的夹角θ=53°,小滑块在运动过程中电荷量保持不变,不计空气 阻力,重力加速度取g=10 m/s2,已知sin 53°=0.8.求:(1)小滑块在圆弧轨道上运动的过程中,克服摩擦力所做的功W; f (2)小滑块经过D点时的速度v 的大小; D (3)小滑块能再次返回MN上方区域的最小磁感应强度B的大小.
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  1. CONNECT:[ UseTime:0.001059s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001620s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000702s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000618s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001272s ]
  6. SELECT * FROM `set` [ RunTime:0.000504s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001394s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369593 LIMIT 1 [ RunTime:0.000998s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369593 [ RunTime:0.011150s ]
  10. UPDATE `wendang` SET `lasttime` = 1773089549 WHERE `id` = 369593 [ RunTime:0.000547s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369593 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001114s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369593 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000371s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369593 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000927s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369593 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001264s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369593 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003260s ]
0.173562s