2015高考物理大一轮总复习93电磁感应规律的综合应用一电路和图象限时规范特训含解析

1、videoconference, Secretary of the provincial Committee of Xia Baolong stressed: this year is the "five water treatment" "357" timetables "for three years to resolve outstanding issues, obviously worked," victory of the year. The County's departments at all levels mu

2、st firmly establish the "guanghui is gold and silver" green development concept, convinced that Castle is not relaxed, always maintaining strategic ability and strong determination to improve the environment, consistently playing well "five water treatment of" winning the war, ev

3、er-higher levels of comprehensive well-off society was built. (A) lay the sewage uphill battle. This year we will "river water quality improved at the county level, up to five" this basic objective grasp of pollution control that focus, with the focus on three things: a good job, "cle

4、ar rivers" reaching the County created. Organization "look back" special inspection, the County garbage River, black and odorous River is "Dragnet" investigation, timely rectification of problems found in place firmly to prevent river pollution rebound. In accordance with th

5、e "one-stop strategy", improving the inferior five water quality monitoring stations work this year to ensure the Elimination of 1 provincial control, five water quality section 3 municipalities controlled deterioration, ensure the creation this year of "clear rivers" standards.

6、Second, pay special attention to pollution-cutting construction of nanotubes. Intercepting nanotubes are the basis of pollution of water source engineering, engineering, matter of success or failure of water management. Urban sewage treatment, to improve "effluent from sewage treatment rate, ru

7、nning accuracy, compliance" requirement, speed up the town's support network construction, is focusing on nanotubes home "last meters" question. Domestic sewage treatment in rural areas, this year is the final year of the three-year action, determination to fight and the momentum

8、around, ending the battle on which fully to ensure the realization of all County 648 formed village coverage. Also, be sure to attach importance to focus on rural domestic wastewater treatment facility operation and management, ensure that wastewater treatment facility up and running, role play, avo

9、id the "Sun" problem. Third, pay special attention to the River Lake pond desilting operation. Provinces now have focused on pollution control of water go to "dig up mud", as the deepening water of this year's "plays". Next, to jump-start an investigation line touch

10、es work, implementation plan according to the priorities and the programme of work, in accordance with the "one river one policy" requires detailed cleaning, dredging plan, planning ahead of time cleaning out mud "way out", according to local conditions to do sludge, promote scie

11、ntific resource utilization of silt and mud. (B) the heavy regulation of heavily polluting industries. Pollution of water must grab the source, wastewater is primarily the source of backward production capacity, increase the intensity of【金版教程】2015届高考物理大一轮总复习 9-3 电磁感应规律的综合应用(一)(电路和图象)限时规范特训（含解析）1. 如图

12、所示，边长为L的正方形线框，从图示位置开始沿光滑斜面向下滑动，中途穿越垂直纸面向里、有理想边界的匀强磁场区域磁场的宽度大于L，以i表示导线框中的感应电流，从线框刚进入磁场开始计时，取逆时针方向为电流正方向，以下it关系图象，可能正确的是()解析： 边长为L的正方形线框，从图示位置开始沿光滑斜面向下滑动，若进入磁场时所受安培力与重力沿斜面方向分力平衡，则线框做匀速直线运动，感应电流为一恒定值；完全进入磁场后磁通量不变，感应电流为零，线框在重力沿斜面方向的分力作用下做匀加速直线运动；从磁场中出来时，感应电流方向反向，所受安培力大于重力沿斜面方向的分力，线框做加速度减小的减速运动，感应电流减小所以选

13、项B正确答案：B2. 2014·湖北黄冈如图(a)所示，在竖直向上的匀强磁场中，水平放置一个不变形的铜圆环，规定从上向下看时，铜环中的感应电流I沿顺时针方向为正方向图(b)表示铜环中的感应电流I随时间t变化的图象，则磁场B随时间t变化的图象可能是下图中的( )解析： 由题图(b)可知，在01 s时间内，圆环中的感应电流恒定且为正，穿过圆环的磁通量均匀增大；在13 s时间内，圆环中无感应电流产生，所以穿过圆环的磁通量不变；在35 s时间内，圆环中的感应电流恒定且为负，圆环中的磁通量均匀减小，故B项正确答案：B3. 如图所示，边长为2L的等腰直角三角形ABC区域存在垂直纸面向里的匀强磁场

14、，其左侧有一边长为L的正方形金属线框abcd，线框以水平速度v匀速穿过匀强磁场区域，设电流逆时针方向为正则在线框通过磁场的过程中，线框中感应电流i随时间t变化的图象正确的是()解析：线框匀速进入磁场时，bc边切割磁感线，由右手定则可知电流从cb，方向为逆时针；当bc边离开磁场，ad边进入磁场过程中，bc边和ad均切割磁感线，但电流方向相反，因bc边的有效长度减小所以电流增大，由右手定则可知，电流方向顺时针，当bc边完全穿出，ad边逐渐离开过程中，电流从da，方向为顺时针且减小，故选A.答案：A4. 如图所示，边长为2l的正方形虚线框内有垂直于纸面向里的匀强磁场，一个边长为l的正方形金属导线框所

15、在平面与磁场方向垂直，导线框和虚线框的对角线共线，每条边的材料均相同从t0开始，使导线框从图示位置开始以恒定速度沿对角线方向进入磁场，直到整个导线框离开磁场区域导线框中的感应电流i(取逆时针方向为正)、导线框受到的安培力F(取向左为正)、导线框中电功率的瞬时值P与通过导体横截面的电荷量q随时间变化的关系大致正确的是()解析： 从t0开始，导线框的位移从0到l，导线框切割磁感线的有效长度线性增加，感应电流也线性增加，导线框的位移从l到2l，导线框完全进入磁场，无感应电流，导线框的位移从2l到3l，导线框切割磁感线的有效长度线性减小，感应电流也线性减小，A正确；导线框的位移从l到2l，导线框完全进

16、入磁场，无感应电流，所以不会受到安培力，B错误；导线框中电功率的瞬时值Pi2R，P随时间变化是二次函数关系，C错误；由qit知，q随时间变化是二次函数关系，D错误答案：A5. 如图所示，虚线左边区域内有垂直纸面向里的匀强磁场粗细均匀的电阻丝围成的正三角形闭合金属框架开始时全部处于匀强磁场中，在外力的作用下把框架匀速拉出磁场，下列说法正确的是()A. 框架匀速拉出过程中，回路总电动势均匀变大B. 框架匀速拉出过程中，回路总电动势不变C. 外力F外随位移x的增大而线性增大D. 外力功率P随位移x的增大而线性增大解析：框架匀速拉出过程中，有效长度l均匀增加，由EBlv知，回路总电动势均匀变大，选项A

17、正确、B错误；因为框架做匀速运动，则F外F安BIl，故外力F外随位移x的增大而非线性增大，选项C错误；外力功率PF外v，v恒定不变，故P也随位移x的增大而非线性增大，选项D错误答案：A6. 如图所示，两个相邻的匀强磁场的宽均为L，方向垂直纸面向外，磁感应强度的大小分别为B和2B.一边长为L的正方形线框从位置P沿水平方向匀速穿过这两个磁场到达位置Q，规定感应电流沿逆时针方向为正，则感应电流i随时间t变化的图象是( )解析：线框的位移为0L的过程，根据右手定则可知，线框中感应电流为顺时针方向，感应电动势大小为E1BLv，感应电流大小为I1；线框的位移为L2L的过程，线框中感应电流为顺时针方向，感应

18、电动势大小为E22BLvBLvBLv，感应电流大小为I2；线框的位移为2L3L的过程，线框中感应电流为逆时针方向，感应电动势大小为E32BLv，感应电流大小为I3，D项正确答案：D7. 如图所示，圆形线圈半径为r，电阻为R，线圈内磁感应强度大小B随时间t变化的关系为Bkt(常数k>0)，方向垂直纸面向里回路中滑动变阻器的电阻为2R，其他定值电阻为R，不计回路中导线电阻，不考虑导线周围的磁场对线圈内磁场的影响，当闭合开关后，下列说法正确的是()A. 电容器的上极板带正电B. 圆形线圈两端的电压为kr2C. 当滑片位于滑动变阻器的中央时，电容器两端的电压为kr2D. 当把滑片置于滑动变阻器的

19、最上端和中央时，与电容器串联的电阻热功率不同解析： 由楞次定律判断线圈中感应电动势方向，可知电容器下极板带正电，选项A错；线圈两端电压为路端电压，随着滑动变阻器滑片移动，路端电压变化，选项B错；当滑片位于滑动变阻器中央时，滑动变阻器与右端的电阻并联后，等效电阻为R，电路的总电阻为R，与电容器串联的电阻不分压，当导线处理，电动势kr2，所以电容器两端的电压ukr2，选项C对；与电容器串联的电阻在电路稳定时，热功率为零，选项D错答案：C题组二提能练8. 如图所示，在直角坐标系的第一、四象限中有一垂直纸面向里的匀强磁场，abcd为一正方形金属线框，其一条对角线ac和y轴重合、顶点a位于坐标原点O处；

20、磁场的上边界与线框的ab边刚好完全重合，左边界与y轴重合，右边界与y轴平行t0时刻，线圈以恒定的速度v沿垂直于磁场上边界的方向开始穿过磁场区域取沿abcda的感应电流方向为正方向，则在线圈穿越磁场区域的过程中，感应电流i随时间t变化的图线是()解析： 在d点运动到O点过程中，ab边切割磁感线，根据右手定则可以确定线框中电流方向为逆时针方向，即正方向，选项D错误；t0时刻，ab边切割磁感线的有效长度最大，然后逐渐减小，故感应电动势和感应电流逐渐减小，选项C错误；当cd边与磁场上边界重合后继续运动，cd边切割磁感线，根据右手定则可知线框中电流方向为顺时针方向，即负方向，选项B错误，选项A正确答案：

21、A9. 2014·河北保定如图所示，A是一个边长为L的正方形导线框，每边长电阻为r.现维持线框以恒定速度v沿x轴运动，并穿过图中所示由虚线围成的匀强磁场区域Ubcbc，线框在图示位置的时刻作为计时的零点，则b、c两点间的电势差随时间变化的图线应为( )解析：在线框进入磁场以前的运动过程，即0<t<L/v，Ubc0；线框进入磁场的过程，即L/v<t<2L/v，bc边切割磁感线，其相当于电源部分，其他三边相当于外电路，根据右手定则可知，b端电势高于c端，所以UbcBLv；线框完全进入磁场的运动过程，即2L/v<t<4L/v，UbcBLv；线框离开磁场的

22、过程，<t<，ad边切割磁感线，UbcBLv.综上分析，B项正确答案：B10. 匀强磁场磁感应强度B0.2 T，磁场宽度L3 m，一正方形金属框边长abl1 m，每边电阻R0.2 ，金属框以v10 m/s的速度匀速穿过磁场区，其平面始终保持与磁感线方向垂直，如图所示(1)画出金属框穿过磁场区的过程中，金属框内感应电流I随时间t的变化图线(规定电流方向逆时针为正)(2)画出ab两端电压Ut的变化图线(要求写出作图的依据)解析：(1)金属框进入磁场区域时E1Blv2 V，I12.5 A，方向沿逆时针，感应电流持续的时间t10.1 s金属框完全进入磁场中运动时：E20，I20，无电流持续

23、的时间t20.2 s金属框穿出磁场区时：E3Blv2 V，I32.5 A，方向沿顺时针，感应电流持续的时间t30.1 s得到It图线如图所示(2)cd边进入磁场区时，ab两段电压U1I1R2.5×0.2 V0.5 V金属框完全在磁场中运动时，ab两端电压等于感应电动势U2Blv2 V金属框出磁场时，ab两端电压：U3E3I3R1.5 V由此得Ut图线如图所示答案：见解析11.边长为L0.2 m的正方形区域内有垂直纸面向里的匀强磁场，穿过该区域磁场的磁感应强度随时间变化的图象如图乙所示将边长为L/2，匝数n100，线圈电阻r1.0 的正方形线圈abcd放入磁场，线圈所在平面与磁感线垂直

24、，如图甲所示求：(1)回路中感应电流的方向及磁感应强度的变化率；(2)在04.0 s内通过线圈的电荷量q；(3)06.0 s内整个闭合电路中产生的热量解析：(1)在04.0 s内，回路中感应电流的方向为adcba，磁感应强度的变化率 T/s0.05 T/s在4.06.0 s内，回路中感应电流的方向为abcda，磁感应强度的变化率 T/s0.2 T/s(2)在04.0 s内，线圈内产生的感应电动势E1n·0.05 V回路中感应电流I10.05 A通过线圈的电荷量qI1·t10.2 C(3)04.0 s内，整个闭合电路中产生的热量Q1Irt11×102 J在4.06.

25、0 s内，同理可计算出I20.2 A，整个闭合电路中产生的热量Q2Irt28×102 J06.0 s内整个闭合电路中产生的热量QQ1Q29×102 J.答案：(1)0.2 T/s(2)0.2 C(3)9×102 J为了促进本公司各项经营活动由事后管理向事前管理方式的转变，强化生产经营全过程控制，提高资金使用的计划性，特制定本管理办法，以增加公司资金运行的透明度treatment of heavily polluting industries. According to municipal, and municipal government deployment o

26、f seven big heavy pollution industry regulation "three years action plans", requirements to December 2016 end of Qian, all included shut stopped eliminated of enterprise all shut stopped eliminated in place; June 30, 2017 Qian, all included place regulation upgrade and agglomeration restru

27、cturing of enterprise by unified standard regulation in place, late not standard of enterprise are implementation discontinued; June 30, 2018 Qian, all intends Park production of enterprise relocation Park in place, late not Park of are discontinued. In the process of renovation, will focus on four

28、aspects: to firmly close the high energy consumption and heavy pollution, hopeless enterprise governance and production lines, eliminated a number of yearly emission intensity, low value-added products of backward production capacity. Second, we must strictly enforce the space, total project "T

29、rinity" environment access system, promoting industry access and environmental conditions of access of enterprises to the Park, industrial park, in principle, no longer the class on the new project. Thirdly, promoting replacement and reconstruction of heavily polluting industries, mergers and r

30、eorganizations, guide enterprises to energy conservation, recycling and low-carbon and clean production, and improve the level of green development. Four to establish a long-term supervision mechanism, increase the intensity of special inspections, investigate and punish the rectification is not in

31、place, normal business of running anti-pollution installations do not. (Iii) linkage to promote flood control water, drainage, water supply, improving water saving. Speed up cross Yang support river dike reinforcement, and along Pu seawall except insurance reinforcement, and Lake Qian sluice, and BA Cao sluice, and cloud cover reservoir, focus flood control drainage engineering construction, vigorously implementation "strong library" "solid di" "