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第13章第1练 交变电流的产生和描述_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练

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第13章第1练 交变电流的产生和描述_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第13章第1练 交变电流的产生和描述_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第13章第1练 交变电流的产生和描述_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第13章第1练 交变电流的产生和描述_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练

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1.在匀强磁场中,匝数N=100的矩形线圈绕垂直磁感线的转轴匀速转动,线圈中产生的感 应电动势随时间变化规律如图所示,则下列说法正确的是( ) A.t=0.5×10-2 s时,线圈平面与中性面重合 B.t=1×10-2 s时,线圈中磁通量变化率最大 C.穿过每一匝线圈的最大磁通量为1×10-3 Wb D.线圈转动的角速度为50π rad/s 2.(2022·广东卷·4)如图是简化的某种旋转磁极式发电机原理图.定子是仅匝数n不同的两线 圈,n>n ,二者轴线在同一平面内且相互垂直,两线圈到其轴线交点O的距离相等,且均 1 2 连接阻值为R的电阻,转子是中心在O点的条形磁铁,绕O点在该平面内匀速转动时,两 线圈输出正弦式交变电流.不计线圈电阻、自感及两线圈间的相互影响,下列说法正确的是 ( ) A.两线圈产生的电动势的有效值相等 B.两线圈产生的交变电流频率相等 C.两线圈产生的电动势同时达到最大值 D.两电阻消耗的电功率相等 3.一只低压电源输出的交变电压为 U=10sin 314t (V),π取3.14,以下说法正确的是( ) A.这只电源可以使“10 V 2 W”的灯泡正常发光 B.这只电源的交变电压的周期是314 s C.这只电源在t=0.01 s时电压达到最大值 D.“10 V 2 μF”的电容器可以接在这只电源上4.(多选)如图所示,图线a是线圈在匀强磁场中匀速转动时所产生正弦式交变电流的图像, 当调整线圈转速后,其在同一磁场中匀速转动过程所产生正弦式交变电流的图像如图线 b所 示.下列关于这两个正弦式交变电流的说法中正确的是( ) A.在图中t=0时刻穿过线圈的磁通量均为零 B.线圈先后两次转速之比为3∶2 C.交变电流a的电动势瞬时值表达式为e=10sin(5πt) V D.交变电流b的电动势最大值为 V 5.某研究小组成员设计了一个如图所示的电路,已知纯电阻R的阻值不随温度变化.与R并 联的是一个理想的交流电压表,D是理想二极管(它的导电特点是正向电阻为零,反向电阻 为无穷大).在A、B间加一交流电压,其瞬时值的表达式为u=20sin 100πt(V),则交流电压 表的示数为( ) A.10 V B.20 V C.15 V D.14.1 V 6.(2018·全国卷Ⅲ·16)一电阻接到方波交流电源上,在一个周期内产生的热量为 Q ;若该 方 电阻接到正弦交流电源上,在一个周期内产生的热量为Q 该电阻上电压的峰值均为u , 正. 0 周期均为T,如图所示.则Q ∶Q 等于( ) 方 正 A.1∶ B.∶1 C.1∶2 D.2∶1 7.(多选)如图所示,一个半径为r的半圆形线圈,以直径ab为轴匀速转动,转速为n,ab 的左侧有垂直于纸面向里(与ab垂直)的匀强磁场,磁感应强度大小为B.M和N是两个集流 环,负载电阻为R,线圈、电流表和连接导线的电阻不计,若图示位置为初始时刻,则( )A.感应电动势的最大值为2π2Bnr2 B.从图示位置起到转过转的时间内,负载电阻R上产生的热量为 C.从图示位置起到转过转的时间内,通过负载电阻R的电荷量为 D.电流表的示数为 8.(多选)(2023·陕西咸阳市模拟)如图所示,发电机内部线圈处于磁体和圆柱形铁芯之间的 径向磁场中,磁体的N、S极间的过渡区域宽度很小,可忽略不计.线圈的匝数为N、面积 为S、总电阻为r,线圈所在位置的磁感应强度大小为B.当线圈以角速度ω匀速转动时,额 定电压为U、电阻为R的小灯泡在电路中恰能正常发光,则( ) A.发电机输出的电流为矩形波交流电 B.灯泡两端电压U=NBSω C.感应电动势的有效值是(1+)U D.转动过程中穿过线圈的磁通量始终为零 9.(多选)如图甲所示,电阻不计、面积S=0.04 m2的固定矩形线圈水平放置,与线圈平面 垂直的空间有均匀分布的匀强磁场,磁场的磁感应强度随时间变化的规律如图乙所示.此时 与线圈连接的额定电压是40 V的灯泡正常发光,氖泡两端瞬时电压达到40 V时开始发光. 下列说法正确的是(不计灯丝电阻随温度的变化)( ) A.氖泡两端电压的瞬时值表达式为u=40·cos 100πt (V) B.矩形线圈匝数N=50匝 C.氖泡的发光频率为50 Hz D.若将氖泡换成一个耐压值为40 V的电容器,电容器可以安全工作 10.如图所示,间距为L的光滑平行金属导轨,水平地放置在竖直向上且磁感应强度大小为 B的匀强磁场中,一端接阻值为R的电阻.一有效电阻为r、质量为m的导体棒放置在导轨上,在外力F作用下从t=0时刻开始运动,其速度随时间的变化规律为 v=v sin ωt,不计 m 导轨电阻.求: (1)从t=0到t=时间内,电阻R上产生的热量; (2)从t=0到t=时间内,外力F所做的功. 11.(2023·山东德州市模拟)如图所示,坐标系xOy的第一、四象限的两块区域内分别存在垂 直纸面向里、向外的匀强磁场,磁感应强度的大小均为 1.0 T,两块区域曲线边界的曲线方 程为y=0.5sin 2πx(m)(0≤x≤1.0 m).现有一单匝矩形导线框abcd在拉力F的作用下,从图 示位置开始沿x轴正方向以2 m/s的速度做匀速直线运动,已知导线框长为 1 m、宽为0.5 m、总电阻为1 Ω,开始时bc边与y轴重合.则导线框穿过两块区域的整个过程拉力 F做的 功为( ) A.0.25 J B.0.375 J C.0.5 J D.0.75 J 12.(多选)如图所示的正方形线框abcd的边长为L,每边电阻均为r,在垂直于纸面向里、 磁感应强度大小为B的匀强磁场中绕cd轴以角速度ω匀速转动,c、d两点与一阻值为r的 电阻相连,各表均可视为理想电表,导线电阻不计,则下列说法中正确的是( ) A.线框abcd产生的电流为交变电流 B.当S断开时,电压表的示数为零 C.当S断开时,电压表的示数为BωL2 D.当S闭合时,电流表的示数为
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  1. CONNECT:[ UseTime:0.000628s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000812s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000344s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000507s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000529s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373685 LIMIT 1 [ RunTime:0.000419s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373685 [ RunTime:0.011526s ]
  10. UPDATE `wendang` SET `lasttime` = 1773120097 WHERE `id` = 373685 [ RunTime:0.005426s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373685 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005344s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373685 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000450s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373685 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001173s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373685 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003127s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373685 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002026s ]
0.105540s