当前位置:首页>文档>专题72电磁感应中能量和动量问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

专题72电磁感应中能量和动量问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题72电磁感应中能量和动量问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题72电磁感应中能量和动量问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题72电磁感应中能量和动量问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题 72 电磁感应中能量和动量问题 1.[2022·北京市考试]如图所示,在竖直向下的匀强磁场中,水平 U型导体框左端连 接一阻值为R的电阻,质量为m、电阻为r的导体棒ab置于导体框上.不计导体框的电阻、 导体棒与框间的摩擦.ab以水平向右的初速度v 开始运动,最终停在导体框上.在此过程 0 中 ( ) A.导体棒做匀减速直线运动 B.导体棒中感应电流的方向为a→b C.电阻R消耗的总电能为 D.导体棒克服安培力做的总功小于mv 2.[2022·湖南省选考](多选)两个完全相同的正方形匀质金属框,边长为 L,通过长为 L的绝缘轻质杆相连,构成如图所示的组合体.距离组合体下底边 H处有一方向水平,垂 直纸面向里的匀强磁场.磁场区域上下边界水平,高度为 L,左右宽度足够大.把该组合 体在垂直磁场的平面内以初速度v 水平无旋转抛出,设置合适的磁感应强度大小B使其匀 0 速通过磁场,不计空气阻力.下列说法正确的是( ) A.B与v 无关,与成反比 0 B.通过磁场的过程中,金属框中电流的大小和方向保持不变 C.通过磁场的过程 ,组合体克服安培力做功的功率与重力做功的功率相等 D.调节H、v 和B,只要组合体仍能匀速通过磁场,则其通过磁场的过程中产生的热 0 量不变 3.[2022·湖南省湘潭市模拟](多选)如图所示,半径为r的粗糙四分之一圆弧导轨与光 滑水平导轨平滑相连,四分之一圆弧导轨区域没有磁场,水平导轨区域存在磁感应强度大 小为B、方向竖直向上的匀强磁场,导轨间距为d,ab、cd是质量均为m、电阻均为R的 金属棒,导轨电阻忽略不计.cd静止在水平轨道上,ab从四分之一圆弧轨道顶端由静止释 放,在圆弧轨道上克服阻力做功mgr,水平导轨足够长,ab、cd始终不会相撞,重力加速 度为g.从ab棒进入水平轨道开始,下列说法正确的是( )A.ab棒先做匀减速直线运动,最后做匀速直线运动 B.cd棒先做匀加速直线运动,最后和ab以相同的速度做匀速直线运动 C.ab棒刚进入磁场时,cd棒电流大小为 D.ab棒的最终速度大小为 4.[2022·河南省部分名校巩固卷](多选)如图所示,电阻不计的光滑金属导轨MN、PQ 水平放置,间距为d,两侧接有电阻R 、R ,阻值均为R,OO 右侧有磁感应强度大小为 1 2 1 2 B,方向垂直纸面向里的匀强磁场,质量为m、长度也为d的金属杆置于OO 左侧,在水 1 2 平向右、大小为F的恒定拉力作用下由静止开始运动,经时间t到达OO 时撤去恒力F, 1 2 金属杆在到达NQ之前减速为零.已知金属杆电阻也为R,与导轨始终保持垂直且接触良 好,下列说法正确的是( ) A.杆刚进入磁场时速度大小为 B.杆刚进入磁场时电阻R 两端的电势差大小为 1 C.整个过程中,流过金属杆的电荷量为 D.整个过程中,电阻R 上产生的焦耳热为 1 5.[2022·湖南省湘潭市模拟]如图所示,两金属杆ab和cd长均为L=0.5 m,电阻分别 为R =0.1 Ω和R =0.2 Ω,质量分别为m =4 kg和m =2 kg,用两根质量和电阻均可忽略 1 2 1 2 的不可伸长的柔软导线将它们连成闭合回路,并悬挂在水平、光滑、不导电的圆棒两侧. 两金属杆都处在水平位置,整个装置处在一与回路平面相垂直的匀强磁场中,磁感应强度 为B=2 T.初始状态杆ab比杆cd高h=1.2 m,现让杆ab由静止开始向下运动,当杆cd 运动到比杆ab高h时,杆ab恰好开始做匀速直线运动,取g=10 m/s2.求: (1)杆ab从释放到开始做匀速直线运动的过程中通过杆ab的电荷量; (2)杆ab做匀速直线运动时的速度; (3)杆ab从释放到开始做匀速直线运动的过程中杆ab上产生的焦耳热.6.[2022·张家口市期末考试]如图所示,足够长,间距为L的平行光滑金属导轨ab、 de构成倾角为θ的斜面,上端接有阻值为R的定值电阻,足够长的平行光滑金属导轨bc、 ef处于同一水平面内,倾斜导轨与水平导轨在b、e处平滑连接,且b、e处装有感应开关 倾斜导轨处于垂直导轨平面向上的匀强磁场中,水平导轨处于竖直向上的匀强磁场中,磁 感应强度大小均为B;距离b足够远处接有未闭合的开关S,在开关S右侧垂直导轨放置导 体棒N,在倾斜导轨上距b、e足够远的位置放置导体棒M,现将导体棒M由静止释放, 当导体棒M通过b、e处后瞬间感应开关自动断开.已知导体棒 M的质量为m,电阻为 R,导体棒N的质量为2m,电阻为2R,两导体棒运动过程中始终与导轨接触良好且与导轨 垂直,重力加速度为g,不计导轨电阻及空气阻力. (1)保持开关S断开,求导体棒M通过感应开关前瞬间的速度大小; (2)若固定导体棒N,导体棒M通过感应开关后瞬间闭合开关S,求导体棒M在水平导 轨上运动的位移; (3)若不固定导体棒N,导体棒M通过感应开关后瞬间闭合开关S,求导体棒N上产生 的焦耳热.
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  1. CONNECT:[ UseTime:0.000729s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000721s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000527s ]
  6. SELECT * FROM `set` [ RunTime:0.000179s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000538s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369737 LIMIT 1 [ RunTime:0.000459s ]
  9. UPDATE `wendang` SET `liulancishu` = 2 WHERE `id` = 369737 [ RunTime:0.003125s ]
  10. UPDATE `wendang` SET `lasttime` = 1773090820 WHERE `id` = 369737 [ RunTime:0.000516s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369737 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000429s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369737 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000589s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369737 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006227s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369737 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002287s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369737 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002051s ]
0.089977s