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热点10 磁场的性质_4.2025物理总复习_2023年新高复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(新高考版)_2023年高考物理二轮复习讲义(新高考版)_学生版_考前特训_热点突破练

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热点10 磁场的性质_4.2025物理总复习_2023年新高复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(新高考版)_2023年高考物理二轮复习讲义(新高考版)_学生版_考前特训_热点突破练
热点10 磁场的性质_4.2025物理总复习_2023年新高复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(新高考版)_2023年高考物理二轮复习讲义(新高考版)_学生版_考前特训_热点突破练
热点10 磁场的性质_4.2025物理总复习_2023年新高复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(新高考版)_2023年高考物理二轮复习讲义(新高考版)_学生版_考前特训_热点突破练

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热点 10 磁场的性质 1.(多选)(2021·浙江6月选考·15)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=125F 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.在离两导线所在的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·山东济南市二模)如图所示,abc是以O点为圆心的三分之一圆弧,b为圆弧中点, a、b、c处各有一垂直纸面的通电直导线,电流大小相等、方向均垂直纸面向里,整个空 间还存在一个磁感应强度大小为B的匀强磁场,O点处的磁感应强度恰好为零.若将c处 电流反向,其他条件不变,则O点处的磁感应强度大小为( ) A.B B.2B C.3B D.0 3.(多选)如图所示,条形磁体放在光滑斜面上,用平行于斜面的轻弹簧拉住,使磁体处于静 止状态.图中圆圈为垂直于纸面放置的直导线的横截面,当导线中无电流时,磁体对斜面 的压力大小为F ;当导线中有电流通过时,磁体对斜面的压力大小为 F .下列说法正确的 N1 N2 是( ) A.若导线位于图中位置1且电流方向向外,则F >F N1 N2 B.若导线位于图中位置1且电流方向向里,则弹簧伸长量增大 C.若导线位于图中位置2且弹簧伸长量增大,则导线中电流方向向里 D.若导线位于图中位置2且弹簧伸长量增大,则F >F N1 N2 4.(2022·福建三明市三模)如图所示,边长为l的等边三角形导线框用绝缘细线悬挂于天花板, 导线框中通有逆时针方向的电流,图中虚线过 ab和ac边的中点,虚线的下方有一垂直于导线框向内的匀强磁场,此时通电导线框处于静止状态,细线的拉力大小为 F .保持其他 T1 条件不变,现将虚线下方的磁场,平移至虚线上方,稳定后细线的拉力大小变为 F .已知 T2 导线框的质量为m,则重力加速度g为( ) A. B. C. D. 5.(2022·湖南省二模)利用霍尔效应传感器可以设计出自行车速度计.如图甲所示,一块磁 体安装在自行车前轮上,轮子每转一圈,这块磁体就靠近传感器一次,传感器会输出一个 脉冲电压.如图乙所示,为霍尔元件的工作原理图,电源输出电压为U.当磁场靠近霍尔元 1 件时,在导体前后表面间出现电势差为U,称为霍尔电势差.下列说法正确的是( ) 2 A.图乙中霍尔元件的载流子带正电 B.自行车的车速变大,霍尔电势差U 不变 2 C.传感器的电源输出电压减小,霍尔电势差U 变大 2 D.已知自行车车轮的半径,再根据霍尔电势差U 的大小,即可求得车速大小 2 6.(2021·河北卷·5)如图,距离为d的两平行金属板P、Q之间有一匀强磁场,磁感应强度 大小为B ,一束速度大小为v的等离子体垂直于磁场喷入板间,相距为L的两光滑平行金 1 属导轨固定在与导轨平面垂直的匀强磁场中,磁感应强度大小为 B ,导轨平面与水平面夹 2 角为θ,两导轨分别与P、Q相连,质量为m、接入电路的电阻为R的金属棒ab垂直导轨 放置,恰好静止,重力加速度为g,不计导轨电阻、板间电阻和等离子体中的粒子重力, 下列说法正确的是( ) A.导轨处磁场的方向垂直导轨平面向上,v= B.导轨处磁场的方向垂直导轨平面向下,v= C.导轨处磁场的方向垂直导轨平面向上,v=D.导轨处磁场的方向垂直导轨平面向下,v= 7.(多选)(2022·湖北卷·11)如图所示,两平行导轨在同一水平面内.一导体棒垂直放在导轨 上,棒与导轨间的动摩擦因数恒定.整个装置置于匀强磁场中,磁感应强度大小恒定,方 向与金属棒垂直、与水平向右方向的夹角 θ可调.导体棒沿导轨向右运动,现给导体棒通 以图示方向的恒定电流,适当调整磁场方向,可以使导体棒沿导轨做匀加速运动或匀减速 运动.已知导体棒加速时,加速度的最大值为g;减速时,加速度的最大值为g,其中g为 重力加速度大小.下列说法正确的是( ) A.棒与导轨间的动摩擦因数为 B.棒与导轨间的动摩擦因数为 C.加速阶段加速度大小最大时,磁场方向斜向下,θ=60° D.减速阶段加速度大小最大时,磁场方向斜向上,θ=150°
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  1. CONNECT:[ UseTime:0.000541s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000736s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000256s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000499s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000539s ]
  8. SELECT * FROM `wendang` WHERE `id` = 372443 LIMIT 1 [ RunTime:0.000780s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 372443 [ RunTime:0.010453s ]
  10. UPDATE `wendang` SET `lasttime` = 1773111521 WHERE `id` = 372443 [ RunTime:0.000585s ]
  11. SELECT * FROM `wendang` WHERE `id` < 372443 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006334s ]
  12. SELECT * FROM `wendang` WHERE `id` > 372443 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000430s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 372443 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006866s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 372443 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001458s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 372443 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002485s ]
0.102990s