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1、-1-电磁感应练习1、图 2 所示，边长为 L 的正方形线框，在拉力F的作用下，进入宽度为a 的匀强磁场，且 aL.分析在以下几种情况下产生内能的多少？（1）线框在拉力 F作用下匀速进入磁场；（2）线框在拉力 F作用下加速进入磁场；（3）线框在拉力 F作用下减速进入磁场.2、如图 3 所示，金属棒 a 从 h 高处自静止沿光滑弧形轨道下滑，进入轨道的水平部以后，在自上而下的匀强磁场中运动，水平轨道也是光滑的，磁场磁感应强度是 B.在轨道的水平部分原来静止地放着一根金属棒b，已知两棒质量相等且等于m，如果 a 棒始终没有跟 b 棒相接触，求整个过程中导轨及两棒组成的回路消耗的电能.3、如图 1
2、所示，水平放置的光滑金属导轨由宽、窄两部分组成，宽部分的宽度是窄部分的两倍，有一范围足够大的匀强磁场垂直于该金属导轨.两根金属杆甲、乙均垂直导轨且质量相等，现给甲杆以水平向右的初速度v0，乙固定不动.在两金属导杆和导轨电阻均不计的情况下，求两金属杆最后的稳定速度为多少.精品资料-欢迎下载-欢迎下载 名师归纳-第 1 页，共 20 页 -2-4、如图 B-10 所示，粗细均匀的金属环的电阻为R，可以绕轴 O转动的金属杆 OA的电阻为 R/4，杆长为 L，A端与环相接触，一阻值为R/2 的定值电阻分别与杆的端点及环的边缘连接，杆 OA在垂直于环面向里的、磁感应强度为 B的匀强磁场中，以角速度 顺时
3、针转动，求电路中总电流的变化范围.5、如图 A-3 所示，边长为 0.5m、电阻为 10 的正方形线框 ABCD 绕 AB边为轴在匀强磁场中匀速转动，AB边和磁场垂直，转速为每秒50转，磁感应强度为0.4T.（1）试求正方形线框中感应电流的最大值；（2）试写出正方形线框中感应电流的瞬时表达式；（3）在转动过程中，当穿过线框的磁通量为0.05Wb 时，感应电流的瞬时值为多大？6、如图 C-1 所示，在两磁极间存在均匀的辐向磁场，一面积为S、电阻为 R的矩形线框处于两磁极间，绕其固定轴以角速度 匀速转动，其轴心位于辐向磁场的精品资料-欢迎下载-欢迎下载 名师归纳-第 2 页，共 20 页 -文档编
4、码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档
5、编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文
6、档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3
7、文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V
8、3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8
9、V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E
10、8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3-3-中心.由于转动使线框切割磁感线而产生感应电动势，已知线框切割处的磁感应强
11、度大小均为 B，从图示位置开始计时.（1）试作出线框中感应电动势随时间变化的图象；（2）试求线框的电功率.7、如图所示，两根平行金属导轨固定在水平桌面上，每根导轨每米的电阻为r00.10/m，导轨的端点 P、Q用电阻可忽略的导线相连，两导轨间的距离 l 0.20m。有随时间变化的匀强磁场垂直于桌面，已知磁感强度B与时间 t 的关系为 Bkt，比例系数 k0.020T/s，一电阻不计的金属杆可在导轨上无摩擦地滑动，在滑动过程中保持与导轨垂直，在t 0 时刻，金属杆紧靠在P、Q端，在外力作用下，杆以恒定的加速度从静止开始向导轨的另一端滑动，求在t 6.0s 时金属杆所受的安培力。8、如图：两根平行
12、的金属导轨，固定在同一水平面上，磁感强度B0.50T 的匀强磁场与导轨所在平面垂直，导轨的电阻很小，可忽略不计。导轨间的距离l 0.20m。两根质量均为m 0.10kg 的平行金属杆甲、乙可在导轨上无摩擦地滑动，滑动过程中与导轨保持垂直，每根金属杆的电阻为R0.50。在 t 0 时刻，两杆都处于静止状态。现有一与导轨平行，大小为0.20N 的恒力 F作用于金属杆甲上，使金属杆在导轨上滑动。经过t 5.0s，金属杆甲的加速度为a1.37m/s2，问此时两金属杆的速度各为多少？精品资料-欢迎下载-欢迎下载 名师归纳-第 3 页，共 20 页 -文档编码:CO5F4J10S7V4 HZ1H1I10H
13、1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10
14、H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I1
15、0H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I
16、10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1
17、I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H
18、1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1
19、H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3-4-9、曾经流行过一种自行车车头灯供电的小型交流发电机，图1 为其结构示意图。图中 N、S是一对固定的磁极，abcd 为固定
20、的转轴上的矩形线框，转轴过bc 边中点，与 ab 边平行，它的一端有一半径ro=1.0 cm 的摩擦小轮，小轮与自行车车轮的边缘相接触，如图2 所示。当车轮转动时，因摩擦而带动小轮转动，从而使线框在磁极间转动。设线框由N=800匝导线圈组成，每匝线圈的面积S=20 cm2，磁极间的磁场可视作匀强磁场，磁感强度B=0.010T，自行车车轮的半径R1=35 cm，小齿轮的半径 R2=4.0 cm，大齿轮的半径 R3=10.0 cm（见图 2）。现从静止开始使大齿轮加速转动，问大齿轮的角速度为多大才能使发电机输出电压的有效值U=3.2 V?（假设摩擦小轮与自行车轮之间无相对滑动）10、如图所示，OA
21、CO 为置于水平面内的光滑闭合金属导轨，O、C处分别接有短电阻丝（图中粗线表法），R14、R28（导轨其它部分电阻不计）。导轨OAC的形状满足方程（单位：m）。磁感强度 B0.2T 的匀强磁场方向垂精品资料-欢迎下载-欢迎下载 名师归纳-第 4 页，共 20 页 -文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B
22、1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7
23、B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D
24、7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8
25、D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA
26、8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 Z
27、A8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10
28、ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3-5-直于导轨平面。一足够长的金属棒在水平外力F作用下，以恒定的速率 v5.0m/s水平向右在导轨上从O点滑动到 C点，棒与导思接触良好且始终保持与OC 导轨垂直，不计棒的电阻。求：（1）外力 F的最大值；（）属棒在导轨上运动时电阻丝R1上消耗的最大功率；（3）在滑动过程中通过金属棒的电流I 与时间 t 的关系。11、如图所示，两条互相平行的光滑金属导轨位于水平面内，距离为l 0.2 米，在导轨的一端接
29、有阻值为R 0.5 欧的电阻，在 X0处有一与水平面垂直的均匀磁场，磁感强度 B0.5 特斯拉。一质量为m 0.1 千克的金属直杆垂直放置在导轨上，并以 v02 米/秒的初速度进入磁场，在安培力和一垂直于杆的水平外力F的共同作用下作匀变速直线运动，加速度大小为a2 米/秒2、方向与初速度方向相反。设导轨和金属杆的电阻都可以忽略，且接触良好。求：（1）电流为零时金属杆所处的位置；（2）电流为最大值的一半时施加在金属杆上外力F的大小和方向；（3）保持其他条件不变，而初速度v0取不同值，求开始时F 的方向与初速度 v0取值的关系。12、如图 1 所示.一对平行光滑轨道放置在水平面上，两轨道间距l 0
30、.20m，电阻 R1.0；有一导体杆静止地放在轨道上，与两轨道垂直，杆及轨道的电阻皆可忽略不计，整个装置处于磁感强度B0.50T 的匀强磁场中，磁场方向垂直轨道精品资料-欢迎下载-欢迎下载 名师归纳-第 5 页，共 20 页 -文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S
31、7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10
32、S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J1
33、0S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J
34、10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4
35、J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F
36、4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5
37、F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3-6-面向下.现用一外力 F沿轨道方向拉杆，使之做匀加速运动，测得力F与时间 t的关系如图 2 所示.求杆的质量 m的加速度 a.13、半径为 a的圆形区域内有均匀磁场，磁感强度为B0.2T，磁场方向垂直纸面向里，半径为 b 的金属圆环与磁场同心地放置，磁场与环面垂直，其中a0.4m，b0.6m，金属环上分别接有灯L1、L2，两灯的电阻均为R02，一金属棒 MN与金属环接触良好，棒与环的电阻均忽略不计（1）若棒以 v05m/s 的速率在环上
38、向右匀速滑动，求棒滑过圆环直径OO 的瞬时（如图所示）MN中的电动势和流过灯L1的电流。（2）撤去中间的金属棒MN 将右面的半圆环OL2O 以 OO 为轴向上翻转 90o，若此时磁场随时间均匀变化，其变化率为B/t（4/3.14）T/s，求 L1的功率。14、如图所示，固定水平桌面上的金属框架cdef，处在竖直向下的匀强磁场中，金属棒 ab 搁在框架上，可无摩擦滑动，此时 adeb 构成一个边长为的正方形，棒的电阻为，其余部分电阻不计，开始时磁感强度为。精品资料-欢迎下载-欢迎下载 名师归纳-第 6 页，共 20 页 -文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7
39、B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D
40、7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8
41、D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA
42、8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 Z
43、A8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10
44、ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10
45、 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3-7-（1）若从时刻起，磁感强度均匀增加，每秒增量为，同时保持棒静止，求棒中的感应电流，在图上标出感应电流的方向。（2）在上述（1）情况中，始终保
46、持棒静止，当秒末时需加的垂直于棒的水平拉力为多大？（3）若从时刻起，磁感强度逐渐减小，当棒以恒定速度向右作匀速运动时，可使棒中不产生感应电流，则磁感强度应怎样随时间变化（写出 B与 的关系式）？15、如图所示，在x 轴上方有垂直于 xy 平面向里的匀强磁场，磁感应强度为B；在 x 轴下方有沿 y 轴负方向的匀强电场，场强为E。一质量为 m，电量为-q 的粒子从坐标原点 O沿着 y 轴正方向射出。射出之后，第三次到达x 轴时，它与点 O的距离为 L。求此粒子射出时的速度v 和运动的总路程 s（重力不计）。16、某种超导磁悬浮列车是利用超导体的抗磁作用使列车车体向上浮起，同时通过周期性地变换磁极方
47、向而获得推进动力其推进原理可以简化为如图所示的模型：在水平面上相距b 的两根平行直导轨间，有竖直方向等距离分布的匀强磁场 B1和 B2，且 B1=B2=B，每个磁场的长都是a，相间排列，所有这些磁场都以速度 v 向右匀速运动 这时跨在两导轨间的长为a 宽为 b 的金属框 MNQP（悬浮在导轨正上方）在磁场力作用下也将会向右运动设金属框的总电阻为R，运动中所受到的阻力恒为f，求：精品资料-欢迎下载-欢迎下载 名师归纳-第 7 页，共 20 页 -文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 Z
48、A8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10
49、ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10
50、 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C10 ZA8D7B1E8V3文档编码:CO5F4J10S7V4 HZ1H1I10H1C1