当前位置:首页>文档>专题61磁场对电流的作用_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61磁场对电流的作用_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61磁场对电流的作用_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61磁场对电流的作用_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61磁场对电流的作用_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61磁场对电流的作用_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 61 磁场对电流的作用 1.[2021·浙江卷6月](多选)如图所示,有两根用超导材料制成的长直平行细导线 a、 b,分别通以80 A和100 A,流向相同的电流,两导线构成的平面内有一点 p,到两导线的 距离相等.下列说法正确的是( ) A.两导线受到的安培力F=1.25 F b a B.导线所受的安培力可以用F=ILB计算 C.移走导线b前后,p点的磁感应强度方向改变 D.在离两导线平面有一定距离的有限空间内,不存在磁感应强度为零的位置 2.[2022·江苏省常州市期中]如图所示,导体棒Ⅰ固定在光滑的水平面内,导体棒Ⅱ垂 直于导体棒Ⅰ放置,且可以在水平面内自由移动(图为俯视图).给导体棒Ⅰ、Ⅱ通以如图所 示的恒定电流,仅在两导体棒之间的相互作用下,较短时间后导体棒Ⅱ出现在虚线位置. 下列关于导体棒Ⅰ位置的描述可能正确的是( ) 3.有三根相互平行的直导线a、b、c垂直纸面放置,且它们在同一连线上.已知这三 根导线中电流大小分别为I、I、I,且I=I,电流方向如图所示( ) 1 2 3 1 2 A.直导线b受到的安培力向左 B.直导线b受到的安培力向右 C.若只增大I,导线b受到的安培力从a指向b 1 D.若只增大I,导线b受到的安培力从a指向b 2 4.[2022·安徽省合肥市联考]如图所示,导线框ABC由直线AB和四分之一圆弧BC组 成,用柔软导线悬吊处于静止状态,经过A、C的水平线下方有垂直于ABC所在平面向里的匀强磁场,现给导线ABC通以如图所示方向的电流,则导线框受到的安培力方向( ) A.竖直向上 B.竖直向下 C.斜向右下 D.斜向左上 5.通电闭合直角三角形线框ABC处在水平方向的匀强磁场中,磁场方向垂直于线框 平面向里,线框的边BC水平,线框中电流方向如图所示,那么该线框受到的安培力的合 力( ) A.方向水平向左 B.方向竖直向下 C.方向垂直于AB斜向上 D.为零 6. [2022·河南省名校大联考]如图所示,长度为d、质量为m的导体棒用绝缘细线悬挂并 垂直纸面放置,导体棒中有方向由a指向b、大小为I的电流,导体棒处在水平向右的匀强 磁场中.现改变匀强磁场方向,使其方向逆时针缓慢转到水平向左,此过程中细线与竖直 方向的最大夹角为37°.已知重力加速度为g(安培力小于重力),不计空气阻力,sin 37°= 0.6,cos 37°=0.8.则匀强磁场的磁感应强度B大小为( ) A. B. C. D. 7.[2022·江苏省如皋市期中]为了降低潜艇噪音,科学家设想用电磁推进器替代螺旋桨, 装置的截面图如图所示,电磁推进器用绝缘材料制成直海水管道,马鞍形超导线圈形成如 图所示的磁场,正、负电极与直流电源相连后的海水中形成电流,关于该电磁推进器的说 法正确的是( ) A.图示中海水受到的磁场力方向垂直纸面向里 B.图示中推进器受到海水推力方向平行纸面向下 C.由于使用超导线圈,所以海水中不会产生焦耳热D.同等情况下此推进装置在纯净的淡水湖中推进效果比在海水中好 8.[2022·湖北省部分学校质量检测]如图所示为电磁轨道炮的工作原理图.质量 m= 200 g的待发射弹体与轨道保持良好接触,并可在宽为L=2 m的两平行轨道上无摩擦滑动. 若电容器的电容C=5×10-2F,充电后电压为U =2 kV,轨道内充满磁感应强度B=2.5 T 1 的匀强磁场,当开关由a点扳向b点后,能在极短的时间内将弹体加速到v=300 m/s发射 出去.若在这个过程中,通过电磁炮的电荷量为q,电容器两端的电压变为U,则( ) 2 A.q=24 C U=1 976 V 2 B.q=12 C U=1 976 V 2 C.q=24 C U=1 760 V 2 D.q=12 C U=1 760 V 2 9.如图所示,与水平面成α角、宽为L的倾斜平行金属导轨,处在方向竖直向上、磁 感应强度为B的匀强磁场中.当回路电流强度为I时,金属杆ab水平静止在光滑导轨上, 金属杆ab所受安培力为F,斜面的支持力为N,则下列判断正确的是( ) A.安培力方向垂直ab杆沿斜面向上 B.安培力方向垂直ab杆水平向左 C.N= D.N=BIL cos α 10.如图甲所示,质量为1 kg的金属棒ab静止在粗糙的平行导轨上且与导轨垂直,两 平行导轨固定在同一水平面内.ab棒、导轨和定值电阻R组成面积为1 m2的闭合回路,回 路总电阻为3 Ω.回路内有与水平面成37°角斜向上且均匀变化的匀强磁场,从t=0时刻开 始,磁感应强度B随时间t变化的图象如图乙所示.已知两平行导轨的间距为1 m,ab棒 与导轨间的最大静摩擦力等于滑动摩擦力.在t=1 s时,ab棒恰好开始相对导轨开始运动, 取重力加速度g=10 m/s2,sin 37°=0.6,cos 37°=0.8.下列判断正确的是( ) A.ab棒中的电流方向为a流向b B.t=1 s时,ab棒受到的安培力方向水平向右 C.t=1 s时,ab棒与导轨间的压力大小为4 N D.棒与导轨之间的动摩擦因数为0.5 11.如图所示为电流天平的示意图.当左边导线框通以图示方向电流时,天平恰好平 衡.如改变电流方向而仍维持天平平衡,则需在天平右端再加上质量为 2Δm的砝码.由此 可见通电线框在磁场中所受的磁场力的大小为( )A.Δmg B.Δmg C.2Δmg D.3Δmg 12.[2022·辽宁省沈阳市练习](多选)如图所示为某种电磁泵模型的示意图,泵体是长 为L ,宽与高均为L 的长方体.泵体处在方向垂直向外、磁感应强度为 B的匀强磁场中, 1 2 泵体的上下表面接电压为U的电源(内阻不计),理想电流表示数为I.若电磁泵和水面高度差 为h,液体的电阻率为ρ,在t时间内抽取液体的质量为m,不计液体在流动中和管壁之间 的阻力,取重力加速度为g,则( ) A.泵体上表面应接电源正极 B.电磁泵对液体产生的推力大小为BIL 1 C.电源提供的电功率为 D.质量为m的液体离开泵体时的动能UIt-mgh-I2T
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  1. CONNECT:[ UseTime:0.001024s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001611s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.015916s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001687s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001370s ]
  6. SELECT * FROM `set` [ RunTime:0.001879s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001526s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369527 LIMIT 1 [ RunTime:0.011096s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369527 [ RunTime:0.022476s ]
  10. UPDATE `wendang` SET `lasttime` = 1773089183 WHERE `id` = 369527 [ RunTime:0.001124s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369527 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001174s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369527 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000995s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369527 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011339s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369527 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006837s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369527 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018227s ]
0.262265s