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第1部分专题4微专题6 动量观点在电磁感应中的应用_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版

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第1部分专题4微专题6 动量观点在电磁感应中的应用_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版
第1部分专题4微专题6 动量观点在电磁感应中的应用_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版
第1部分专题4微专题6 动量观点在电磁感应中的应用_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版
第1部分专题4微专题6 动量观点在电磁感应中的应用_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_学生版

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微专题 6 动量观点在电磁感应中的应用 1.(2022·广东省调研)如图所示,左端接有阻值为R的定值电阻,且足够长的平行光滑导轨 CE、DF的间距为L,导轨固定在水平面上,且处在磁感应强度大小为 B、方向竖直向下的 匀强磁场中,一质量为m、电阻为r的导体棒ab垂直导轨放置且静止,导轨的电阻不计. 某时刻给导体棒ab一个水平向右的瞬时冲量I,导体棒将向右运动,最后停下来,则此过程 中( ) A.导体棒做匀减速直线运动直至停止运动 B.电阻R上产生的焦耳热为 C.通过导体棒ab横截面的电荷量为 D.导体棒ab运动的位移为 2.(多选)如图甲所示,质量m=3.0×10-3 kg 的 形金属细框水平放置在两水银槽中, 形框的水平细杆CD长l=0.20 m,处于磁感应强度大小为B=1.0 T、方向水平向右的 1 匀强磁场中.有一匝数n=300匝、面积S=0.01 m2的线圈通过开关K与两水银槽相连.线 圈处于与线圈平面垂直、沿竖直方向的匀强磁场中,其磁感应强度B 随时间t变化的关系如 2 图乙所示.t=0.22 s时闭合开关K,瞬间细框跳起(细框跳起瞬间安培力远大于重力),跳起 的最大高度h=0.20 m.不计空气阻力,重力加速度g取10 m/s2,下列说法正确的是( ) A.0~0.10 s内线圈中的感应电动势大小为3 V B.0.10~0.20 s内线圈中的磁通量最大,故感应电动势最大 C.开关K闭合瞬间,CD中的电流方向由C到D D.开关K闭合瞬间,通过细杆CD的电荷量为0.03 C 3.(多选)(2022·河南信阳市高三质量检测)如图所示,两根足够长相互平行、间距d=0.20 m 的竖直导轨,下端连接阻值 R=0.50 Ω的电阻.一根阻值也为0.50 Ω、质量m=1.0×10-2 kg的导体棒ab搁置在两端等高的挡条上.在竖直导轨内有垂直纸面的匀强磁场,磁感应强 度B=0.50 T(图中未画出).撤去挡条,棒开始下滑,经t=0.25 s后下降了h=0.29 m.假设 棒始终与导轨垂直,且与导轨接触良好,不计一切摩擦阻力和导轨电阻,重力加速度取 10m/s2.下列说法正确的是( ) A.导体棒能获得的最大速度为20 m/s B.导体棒能获得的最大速度为10 m/s C.t=0.25 s时间内通过导体棒的电荷量为2.9×10-2 C D.t=0.25 s时导体棒的速度为2.21 m/s 4.(多选)(2022·山东青岛市黄岛区期末)如图,光滑平行金属导轨MN、PQ固定在水平桌面上, 窄轨MP间距0.5 m,宽轨NQ间距1 m,电阻不计.空间存在竖直向上的磁感应强度B=1 T 的匀强磁场.金属棒a、b水平放置在两导轨上,棒与导轨垂直并保持良好接触,a棒的质 量为0.2 kg,b棒的质量为0.1 kg,若a棒以v =9 m/s的水平初速度从宽轨某处向左滑动, 0 最终与b棒以相同的速度沿窄轨运动.若a棒滑离宽轨前加速度恰好为0,窄导轨足够长. 下列说法正确的是( ) A.从开始到两棒以相同速度运动的过程,a、b组成的系统动量守恒 B.金属棒a滑离宽轨时的速度大小为3 m/s C.金属棒a、b最终的速度大小为6 m/s D.通过金属棒横截面的电荷量为0.8 C 5.(多选)如图所示,两条足够长、电阻不计的平行导轨放在同一水平面内,相距 l.磁感应强 度大小为B的范围足够大的匀强磁场垂直于导轨平面向下.两根质量均为 m、电阻均为r的 导体杆a、b与两导轨垂直放置且接触良好,开始时两杆均静止.已知b杆光滑,a杆与导轨 间最大静摩擦力大小为F.现对b杆施加一与杆垂直且大小随时间按图乙所示规律变化的水 0 平外力F,已知在t 时刻,a杆开始运动,此时拉力大小为F ,下列说法正确的是(最大静摩 1 1 擦力等于滑动摩擦力)( ) A.当a杆开始运动时,b杆的速度大小为 B.在0~t 这段时间内,b杆所受安培力的冲量大小为-Ft 1 11 C.在t~t 这段时间内,a、b杆的总动量增加了 1 2D.a、b两杆最终速度将恒定,且两杆速度大小之差等于t 时刻b杆速度大小 1 6.(2022·天津市红桥区第二次质检)如图所示,两足够长的光滑金属导轨竖直放置,相距为 L,一理想电流表与两导轨相连,匀强磁场与导轨平面垂直.一质量为 m、有效电阻为R的 导体棒在距磁场上边界h处由静止释放.导体棒进入磁场后流经电流表的电流逐渐减小,最 终稳定为I.整个运动过程中,导体棒与导轨接触良好,且始终保持水平,不计导轨的电阻, 重力加速度大小为g.求:(重力加速度取10 m/s2) (1)导体棒的最大速度v ,磁感应强度的大小B; m (2)电流稳定后,导体棒运动速度的大小v; (3)若导体棒进入磁场后恰经t时间达到稳定,这段时间的位移x大小. 7.(2022·陕西西安市一模)如图所示,有两光滑平行金属导轨,倾斜部分和水平部分平滑连 接,BE、CH段用特殊材料制成,光滑不导电,导轨的间距L=1 m,左侧接R=1 Ω的定值 电阻,右侧接电容C=1 F的电容器,ABCD区域、EFGH区域均存在垂直于导轨所在平面 向下、磁感应强度B=1 T的匀强磁场,ABCD区域长s=0.3 m.金属杆a、b的长度均为L =1 m,质量均为m=0.1 kg,a的电阻为r=2 Ω,b的电阻不计.金属杆a从距导轨水平部 分h=0.45 m的高度处由静止滑下,金属杆b静止在BEHC区域,金属杆b与金属杆a发生 弹性碰撞后进入EFGH区域,最终稳定运动.求:(重力加速度g取10 m/s2) (1)金属杆a刚进入ABCD区域时通过电阻R的电流I; (2)金属杆a刚离开ABCD区域时的速度v 的大小; 2 (3)金属杆b稳定运动时的速度v 的大小; 4 (4)整个运动过程中金属杆a上产生的焦耳热.8.如图所示,MN、PQ为足够长的水平光滑金属导轨,导轨间距L=0.5 m,导轨电阻不计, 空间有竖直向下的匀强磁场,磁感应强度B=1 T;两直导体棒ab、cd均垂直于导轨放置, 导体棒与导轨始终接触良好.导体棒ab的质量m =0.5 kg,电阻R =0.2 Ω;导体棒cd的质 1 1 量m =1.0 kg,电阻R =0.1 Ω.将cd棒用平行于导轨的水平细线与固定的力传感器连接,给 2 2 ab一个水平向右、大小为v=3 m/s的初速度,求: 0 (1)导体棒ab开始运动瞬间两端的电压U ; ab (2)力传感器示数F随ab运动距离x的变化关系; (3)若导体棒ab向右运动的速度为1.5 m/s时剪断细线,求此后回路中产生的焦耳热.
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  1. CONNECT:[ UseTime:0.000870s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000922s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000517s ]
  6. SELECT * FROM `set` [ RunTime:0.000226s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000534s ]
  8. SELECT * FROM `wendang` WHERE `id` = 374026 LIMIT 1 [ RunTime:0.000425s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 374026 [ RunTime:0.016492s ]
  10. UPDATE `wendang` SET `lasttime` = 1773123890 WHERE `id` = 374026 [ RunTime:0.000666s ]
  11. SELECT * FROM `wendang` WHERE `id` < 374026 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000443s ]
  12. SELECT * FROM `wendang` WHERE `id` > 374026 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005595s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 374026 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002306s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 374026 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001212s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 374026 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000981s ]
0.187007s