2015高考物理大一輪總復(fù)習(xí)93電磁感應(yīng)規(guī)律的綜合應(yīng)用一電路和圖象限時規(guī)范特訓(xùn)含解析_第1頁
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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屆高考物理大一輪總復(fù)習(xí) 9-3 電磁感應(yīng)規(guī)律的綜合應(yīng)用(一)(電路和圖象)限時規(guī)范特訓(xùn)(含解析)1. 如圖

12、所示,邊長為L的正方形線框,從圖示位置開始沿光滑斜面向下滑動,中途穿越垂直紙面向里、有理想邊界的勻強磁場區(qū)域磁場的寬度大于L,以i表示導(dǎo)線框中的感應(yīng)電流,從線框剛進入磁場開始計時,取逆時針方向為電流正方向,以下it關(guān)系圖象,可能正確的是()解析: 邊長為L的正方形線框,從圖示位置開始沿光滑斜面向下滑動,若進入磁場時所受安培力與重力沿斜面方向分力平衡,則線框做勻速直線運動,感應(yīng)電流為一恒定值;完全進入磁場后磁通量不變,感應(yīng)電流為零,線框在重力沿斜面方向的分力作用下做勻加速直線運動;從磁場中出來時,感應(yīng)電流方向反向,所受安培力大于重力沿斜面方向的分力,線框做加速度減小的減速運動,感應(yīng)電流減小所以選

13、項B正確答案:B2. 2014·湖北黃岡如圖(a)所示,在豎直向上的勻強磁場中,水平放置一個不變形的銅圓環(huán),規(guī)定從上向下看時,銅環(huán)中的感應(yīng)電流I沿順時針方向為正方向圖(b)表示銅環(huán)中的感應(yīng)電流I隨時間t變化的圖象,則磁場B隨時間t變化的圖象可能是下圖中的( )解析: 由題圖(b)可知,在01 s時間內(nèi),圓環(huán)中的感應(yīng)電流恒定且為正,穿過圓環(huán)的磁通量均勻增大;在13 s時間內(nèi),圓環(huán)中無感應(yīng)電流產(chǎn)生,所以穿過圓環(huán)的磁通量不變;在35 s時間內(nèi),圓環(huán)中的感應(yīng)電流恒定且為負,圓環(huán)中的磁通量均勻減小,故B項正確答案:B3. 如圖所示,邊長為2L的等腰直角三角形ABC區(qū)域存在垂直紙面向里的勻強磁場

14、,其左側(cè)有一邊長為L的正方形金屬線框abcd,線框以水平速度v勻速穿過勻強磁場區(qū)域,設(shè)電流逆時針方向為正則在線框通過磁場的過程中,線框中感應(yīng)電流i隨時間t變化的圖象正確的是()解析:線框勻速進入磁場時,bc邊切割磁感線,由右手定則可知電流從cb,方向為逆時針;當bc邊離開磁場,ad邊進入磁場過程中,bc邊和ad均切割磁感線,但電流方向相反,因bc邊的有效長度減小所以電流增大,由右手定則可知,電流方向順時針,當bc邊完全穿出,ad邊逐漸離開過程中,電流從da,方向為順時針且減小,故選A.答案:A4. 如圖所示,邊長為2l的正方形虛線框內(nèi)有垂直于紙面向里的勻強磁場,一個邊長為l的正方形金屬導(dǎo)線框所

15、在平面與磁場方向垂直,導(dǎo)線框和虛線框的對角線共線,每條邊的材料均相同從t0開始,使導(dǎo)線框從圖示位置開始以恒定速度沿對角線方向進入磁場,直到整個導(dǎo)線框離開磁場區(qū)域?qū)Ь€框中的感應(yīng)電流i(取逆時針方向為正)、導(dǎo)線框受到的安培力F(取向左為正)、導(dǎo)線框中電功率的瞬時值P與通過導(dǎo)體橫截面的電荷量q隨時間變化的關(guān)系大致正確的是()解析: 從t0開始,導(dǎo)線框的位移從0到l,導(dǎo)線框切割磁感線的有效長度線性增加,感應(yīng)電流也線性增加,導(dǎo)線框的位移從l到2l,導(dǎo)線框完全進入磁場,無感應(yīng)電流,導(dǎo)線框的位移從2l到3l,導(dǎo)線框切割磁感線的有效長度線性減小,感應(yīng)電流也線性減小,A正確;導(dǎo)線框的位移從l到2l,導(dǎo)線框完全進

16、入磁場,無感應(yīng)電流,所以不會受到安培力,B錯誤;導(dǎo)線框中電功率的瞬時值Pi2R,P隨時間變化是二次函數(shù)關(guān)系,C錯誤;由qit知,q隨時間變化是二次函數(shù)關(guān)系,D錯誤答案:A5. 如圖所示,虛線左邊區(qū)域內(nèi)有垂直紙面向里的勻強磁場粗細均勻的電阻絲圍成的正三角形閉合金屬框架開始時全部處于勻強磁場中,在外力的作用下把框架勻速拉出磁場,下列說法正確的是()A. 框架勻速拉出過程中,回路總電動勢均勻變大B. 框架勻速拉出過程中,回路總電動勢不變C. 外力F外隨位移x的增大而線性增大D. 外力功率P隨位移x的增大而線性增大解析:框架勻速拉出過程中,有效長度l均勻增加,由EBlv知,回路總電動勢均勻變大,選項A

17、正確、B錯誤;因為框架做勻速運動,則F外F安BIl,故外力F外隨位移x的增大而非線性增大,選項C錯誤;外力功率PF外v,v恒定不變,故P也隨位移x的增大而非線性增大,選項D錯誤答案:A6. 如圖所示,兩個相鄰的勻強磁場的寬均為L,方向垂直紙面向外,磁感應(yīng)強度的大小分別為B和2B.一邊長為L的正方形線框從位置P沿水平方向勻速穿過這兩個磁場到達位置Q,規(guī)定感應(yīng)電流沿逆時針方向為正,則感應(yīng)電流i隨時間t變化的圖象是( )解析:線框的位移為0L的過程,根據(jù)右手定則可知,線框中感應(yīng)電流為順時針方向,感應(yīng)電動勢大小為E1BLv,感應(yīng)電流大小為I1;線框的位移為L2L的過程,線框中感應(yīng)電流為順時針方向,感應(yīng)

18、電動勢大小為E22BLvBLvBLv,感應(yīng)電流大小為I2;線框的位移為2L3L的過程,線框中感應(yīng)電流為逆時針方向,感應(yīng)電動勢大小為E32BLv,感應(yīng)電流大小為I3,D項正確答案:D7. 如圖所示,圓形線圈半徑為r,電阻為R,線圈內(nèi)磁感應(yīng)強度大小B隨時間t變化的關(guān)系為Bkt(常數(shù)k>0),方向垂直紙面向里回路中滑動變阻器的電阻為2R,其他定值電阻為R,不計回路中導(dǎo)線電阻,不考慮導(dǎo)線周圍的磁場對線圈內(nèi)磁場的影響,當閉合開關(guān)后,下列說法正確的是()A. 電容器的上極板帶正電B. 圓形線圈兩端的電壓為kr2C. 當滑片位于滑動變阻器的中央時,電容器兩端的電壓為kr2D. 當把滑片置于滑動變阻器的

19、最上端和中央時,與電容器串聯(lián)的電阻熱功率不同解析: 由楞次定律判斷線圈中感應(yīng)電動勢方向,可知電容器下極板帶正電,選項A錯;線圈兩端電壓為路端電壓,隨著滑動變阻器滑片移動,路端電壓變化,選項B錯;當滑片位于滑動變阻器中央時,滑動變阻器與右端的電阻并聯(lián)后,等效電阻為R,電路的總電阻為R,與電容器串聯(lián)的電阻不分壓,當導(dǎo)線處理,電動勢kr2,所以電容器兩端的電壓ukr2,選項C對;與電容器串聯(lián)的電阻在電路穩(wěn)定時,熱功率為零,選項D錯答案:C題組二提能練8. 如圖所示,在直角坐標系的第一、四象限中有一垂直紙面向里的勻強磁場,abcd為一正方形金屬線框,其一條對角線ac和y軸重合、頂點a位于坐標原點O處;

20、磁場的上邊界與線框的ab邊剛好完全重合,左邊界與y軸重合,右邊界與y軸平行t0時刻,線圈以恒定的速度v沿垂直于磁場上邊界的方向開始穿過磁場區(qū)域取沿abcda的感應(yīng)電流方向為正方向,則在線圈穿越磁場區(qū)域的過程中,感應(yīng)電流i隨時間t變化的圖線是()解析: 在d點運動到O點過程中,ab邊切割磁感線,根據(jù)右手定則可以確定線框中電流方向為逆時針方向,即正方向,選項D錯誤;t0時刻,ab邊切割磁感線的有效長度最大,然后逐漸減小,故感應(yīng)電動勢和感應(yīng)電流逐漸減小,選項C錯誤;當cd邊與磁場上邊界重合后繼續(xù)運動,cd邊切割磁感線,根據(jù)右手定則可知線框中電流方向為順時針方向,即負方向,選項B錯誤,選項A正確答案:

21、A9. 2014·河北保定如圖所示,A是一個邊長為L的正方形導(dǎo)線框,每邊長電阻為r.現(xiàn)維持線框以恒定速度v沿x軸運動,并穿過圖中所示由虛線圍成的勻強磁場區(qū)域Ubcbc,線框在圖示位置的時刻作為計時的零點,則b、c兩點間的電勢差隨時間變化的圖線應(yīng)為( )解析:在線框進入磁場以前的運動過程,即0<t<L/v,Ubc0;線框進入磁場的過程,即L/v<t<2L/v,bc邊切割磁感線,其相當于電源部分,其他三邊相當于外電路,根據(jù)右手定則可知,b端電勢高于c端,所以UbcBLv;線框完全進入磁場的運動過程,即2L/v<t<4L/v,UbcBLv;線框離開磁場的

22、過程,<t<,ad邊切割磁感線,UbcBLv.綜上分析,B項正確答案:B10. 勻強磁場磁感應(yīng)強度B0.2 T,磁場寬度L3 m,一正方形金屬框邊長abl1 m,每邊電阻R0.2 ,金屬框以v10 m/s的速度勻速穿過磁場區(qū),其平面始終保持與磁感線方向垂直,如圖所示(1)畫出金屬框穿過磁場區(qū)的過程中,金屬框內(nèi)感應(yīng)電流I隨時間t的變化圖線(規(guī)定電流方向逆時針為正)(2)畫出ab兩端電壓Ut的變化圖線(要求寫出作圖的依據(jù))解析:(1)金屬框進入磁場區(qū)域時E1Blv2 V,I12.5 A,方向沿逆時針,感應(yīng)電流持續(xù)的時間t10.1 s金屬框完全進入磁場中運動時:E20,I20,無電流持續(xù)

23、的時間t20.2 s金屬框穿出磁場區(qū)時:E3Blv2 V,I32.5 A,方向沿順時針,感應(yīng)電流持續(xù)的時間t30.1 s得到It圖線如圖所示(2)cd邊進入磁場區(qū)時,ab兩段電壓U1I1R2.5×0.2 V0.5 V金屬框完全在磁場中運動時,ab兩端電壓等于感應(yīng)電動勢U2Blv2 V金屬框出磁場時,ab兩端電壓:U3E3I3R1.5 V由此得Ut圖線如圖所示答案:見解析11.邊長為L0.2 m的正方形區(qū)域內(nèi)有垂直紙面向里的勻強磁場,穿過該區(qū)域磁場的磁感應(yīng)強度隨時間變化的圖象如圖乙所示將邊長為L/2,匝數(shù)n100,線圈電阻r1.0 的正方形線圈abcd放入磁場,線圈所在平面與磁感線垂直

24、,如圖甲所示求:(1)回路中感應(yīng)電流的方向及磁感應(yīng)強度的變化率;(2)在04.0 s內(nèi)通過線圈的電荷量q;(3)06.0 s內(nèi)整個閉合電路中產(chǎn)生的熱量解析:(1)在04.0 s內(nèi),回路中感應(yīng)電流的方向為adcba,磁感應(yīng)強度的變化率 T/s0.05 T/s在4.06.0 s內(nèi),回路中感應(yīng)電流的方向為abcda,磁感應(yīng)強度的變化率 T/s0.2 T/s(2)在04.0 s內(nèi),線圈內(nèi)產(chǎn)生的感應(yīng)電動勢E1n·0.05 V回路中感應(yīng)電流I10.05 A通過線圈的電荷量qI1·t10.2 C(3)04.0 s內(nèi),整個閉合電路中產(chǎn)生的熱量Q1Irt11×102 J在4.06.

25、0 s內(nèi),同理可計算出I20.2 A,整個閉合電路中產(chǎn)生的熱量Q2Irt28×102 J06.0 s內(nèi)整個閉合電路中產(chǎn)生的熱量QQ1Q29×102 J.答案:(1)0.2 T/s(2)0.2 C(3)9×102 J為了促進本公司各項經(jīng)營活動由事后管理向事前管理方式的轉(zhuǎn)變,強化生產(chǎn)經(jīng)營全過程控制,提高資金使用的計劃性,特制定本管理辦法,以增加公司資金運行的透明度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" "

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