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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are unitc(2jhmu u y(6d9yzqn 6s of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that/q61admo vhj.) 4la xr the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number ob/(5)te jpw2w ykp9nv f loops of wire in a coil produces what kind of change on the induc /)2w5e(nv jpbytkw 9ped $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loopm ee+56q g drsi-,ome7 of wire produces what kind +6,dr5eq7m osm ei-g eof change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change onmcdp9m//c gwmg )u 7hd8c7q r6 the inducegm)9wrqhc8d mcp 7u7 /m dc6/gd $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnety(zy (1 m5umvkvv/ t t8fc9oq7ic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a ccohl l-:2x 8:n5qpcz jonductor will be that which tends to produce which of the followingnzc l8:2ojp:xqh5lc - effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablev9cio *bp ux0;. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abx9;u i o*bv0pcove)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizonta*h bol*jxj+g3 s:/khcl table. A bar magnet is held above its center with its north pole pointing down, and relelohx:*kg3/ *+ bjshcjased. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vect-dmo zk8yjqc)8 . qk6tor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of thdqo68k) 8k.z cj-ty mqe induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magndiiv15,7 pdv5*ru 4b q yxmg:yetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction 7y*ig:4 dd15xbv ir,m5yq pvu of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal t;,gt0dbutv.h7,b3ae 3c waj fable top in a region where the magnetic field points straight down. w ;v 3gj3atdfa7tbbu0h,,.ce The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on(ye3k drbj +;8wbtyo3 a horizontal table and carries an ever-increasing current northward. Two coils oyde(wbrb38 o+y;kjt 3f wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the norpx2vw 5e +6ibo; e5zkee0eey +th pole entering first. As the northiwe xbokez 6 epe+ev;0y5e52+ pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoew.05 wq1,b3b ixt w-bdyez q)se direction can be varied. In a region where a uniform magnetic field poe ,wq -q.0bbie ybz5x wdw)13tints straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at conomv+59tgpg:4 l n. f;algc(jm stant angular speed about an axis whose direction can javmgno. t95+gp4g : fclm;(lbe varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.ent5az(w ;)l 2(d nmbh
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways tha4g32vjk/l r xjqz6i7i t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnedq, 1ara3 h;dftic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the8cf4nji 99(on7viwn v east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Makf(9c n9invwovin8j47 e a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a consta33 s hle;jddz*nt angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorp u10 p6n 5*r3tkyvcx5or dr+o transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates tmno2 8(p8c pbutp./3 dz4)goc:ij vpxhrough 60 revolutions each second. The frequency of tt/gcpcjo. ov)p 8p 82 4d n3xm(puzib:he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device uo;k*1w6+j1 u;qbw wm(tacaaxsed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devic dllbu,ep;l gfx51rj-7al l 0-e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains moretalxu: ic-.sy*h9 t :g loops than the primary coil then ilc*:ig9ht.yus -:txa t is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the sec lkngz93 d+23 u(sqh2bxsezc)ondary coil 933xkc+)z s2nd( qle gb us2zhthen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the8y ;2-prw0 lub*qu;wb,kj/* iljrzd w power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant + -g 83xcyqdquick8m2 circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seriesh)lt84hg -1s f z ;kh6 ajb8dha0wp)es to an ideal battery of constant terminal 8speh d 1a4h8 ;wk0gz l )hhtbfa6j-)svoltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ..yda0 ustp d8h y*7voof constant terminal voltage. At thda0*hu. yt ydos87vp.e moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistanceq+em b/*q lvb9s9i.s g R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductaw 9ef4a)b b t6rg:qj4jnce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. 5 fp;3:qipqqdt4ar+c ge (c4hThe time constant for the circuit represents the time required for the current to r5q ef cr: dg i+;q4at43(pcqpheach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in s inw .pi489pkseries to a battery. The battery isps 9piikwn4.8 suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units el5+cw4o9nsv t0 jh( lrxcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supplydv1yz0x w sc-:. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this c+v/u crs)rt t;r 4j.blircuit, the curren 4;+rs.tl/t )rbjrvcut

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when opm/w qr /)3p(q .sn;ng a-nluthe frequency na/n m3(;swgopq- )r lpun./qis tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across a+x2byp9 ua )ji ehc1b:bu*x x+n inductor is doubled, the inductive reactance of tha:u hxxa)x9ubb1yec+bi + * pj2t inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC vo0 ms)/v6r wk ov9 3o-yypf g,:o-tgpvsltage across an inductor approaches zero, the inductive reactance of that vsofy,/-roo)g9pv3ks v tgpm -yw 6:0coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected tk 0ns)s,k ue5:*cx b+qfvd7mr o an AC power supply. In this circuit, the curren0e v7xbk )snu5f :m* k+dqr,cst

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance ii:9v d*d, .+/;gxxel tytgcgz6a0 q xnn an ac circuit changes by what factor when the frequeg y*;+: x d.td9/gz xtxn vq0lc6a,geincy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acka; 3xc y j. p 1kahjsp(/qgb,0o*l3wbross a capacitor approaches zero, the capacitive ,j;(hs k/b k a13ywc.j* gl3bao0 ppqxreactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltau f:i87pc9c fp90hkfh ges of the inductor and capacitor in a RLC series pif99 fu8hfhcp7k0c: circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of a y6d. vl8;xko/fnu+c k w*fuh3n RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R inc(7ua 1*m3xc f1oxjfh nmu-t8 breases. When is this statement true?hfa*ou 8-ctb1( u 1mnx7m3jf x

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The imptl6+ am qedatos58/q 0edance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. T 9a w b(nsg:s sxzp4a20d7(kzwhe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, theq qg1g-20axt d resonant frequq1gg 2tq- 0dxaency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circ;je4,cl8cn ab uit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit ocq4-9lrzefh eaiomz ; *f0/-e icurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in i+n4i lv/cj .ja uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thji./jv+ nli4 ce magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotu0cbyhl5 +* et+ :;od1xoahhsating in a uniform magnetic field of 0.20 T blao* ot+h10sh5y+c: x dh;eu. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m issfvtb 9gocveed8+ml9nec08:rey 466 rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anclc86be8f60et:rv g9 mvso +ede y49ngle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frojnl v1-p-bzv;:;pqa xgz*w lpe,dr( 0vndu86m $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes frb jhp( l4ec8v ccw)bm- 1xx0)tom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turnx0m*p 5oiiu/c9w4 uyys of wire on a square frame with sides 18 cm. A uniform magnetic field is applwyy0uo/i45* ipxuc m9ied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area oye2ok4be 40mzdh 0.gq .b axs2f $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and +b/ z/f1v 70sj6hycntcqut k k(e -gt;area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where tp1aquj( fi2kgv +r;d m -(/newhe downward component of the E+k w /v(qmp2fe-;1uri(n dajgarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rota2xvn g)iwa ,dt/tr: 8imfs ,r4tes at a constant angular velocity of 2.0 rad/s about a verti,gtx4fmisdr):rn/wi a t 8v 2,cal axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 2nr41lmq4mtj 4 gk)qxe/j 7d-n,a;wr u5i bg wloops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ar rcoxi au: 0t2gq(.ae:ea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loowbqceut q6s:5z) z 46ips on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis pqew i )b665 ts:zq4zcuarallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator cons t )4c0qnf9tcrists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple ACmx*s, vrgarj:b x9 o437n6 imiw3dme7 generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0ma7b 4nimgjms 3,dx79v3* ir xow:6re.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximjd r)m2n9yf 4 -dnsyl9um $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatesbu tmnukr+ a/,4*m6 a(6yqpiv on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC monhc fln/5 87m9 xw o-hn;;mvastor have a resistance of 6.00 W. The motor operates on 125ns ;8va f 9nl/-noxwc7;h mhm0 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistado5 m,v s8vo 8:oxcilnbtm0;n3kjf44nce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the sd3jb:nxv,8nsiokcft mlo ;m0 o8v5 44tart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is sk0i n,9 ak27tqe/jwfconnected to a 24-V power supply. The operating current is 1a jkf2it /0w9nkeq,s7.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectedaqp:g5x4;fxt r7 z.vv to a 24-V power supply. The ope5z7xxf;av r:v tp. 4qgrating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needehc2h mzesvs84v.o1-p d to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fl+mfe/p s:n)ju z5aitpu jve2m2p2,l+m 5.cp fow in the secondary. How many ture ft/ 25z5a2m u fp:jpl2pmv.s+pmnuc+),ijens are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V sl l3w1bum /x8 hfna+8zecondary has 100 tur1a/ln m83+blhz u wf8xns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cocjya1zblfk p9 j9 r8,1e;ky ;q w5d4ooil. If th9ke;b z;8q9 jd,ap4jyrf w1cl1 ykoo5e current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the c4r 7 d t5u4gnz-dssimq)lx5. primary of a transformer. Assuming 100% efficiency, how many amps at ml-4d .is4n5rzcg )s dxqtu5 724 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer pro:tmm2x1 rwkg;r hw 45j; yrofzfd9c82 vides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prc fdzrrh;1 8my;omx2fw:w 52tg 9 kj4rimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seco+oa;orduv3w hx6qha*/cs5jby0k -p4 q+iqu3ndary coil. If 120 V at 2.0 A is *3 qiq uu6ko h5vx40hrw;byd/c-3o pja+asq+ applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformero-vmrgrhxq a4 x-uu)-eh6h96 has 60 turns on its primary coil and 300 turns on its secondary coil. xhgxaeuhq -m-9u6h-r4 v6r) o If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10y;ojfq.5xd.z )hrw4t4d: ujz ;fp sb5evm/1d0 turns and its secondary has 200 turns. If the input current at the primary is bze/ ;w m5sqjffh 4dotpjdz;u: .yd51.rv4)x 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has kvr il:; ;cnaggx r:z5i ,)qc*200 turns. If the input voltage to the primary is 100 V, we can expect t;:5, lvr c x:acqigz;)gni*krhe output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has(7z1 z 9cztwpi 200 turns. If the power (wcz9 pzz1ti7input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The v-b 1v8bu.+li4 tk ztv 1xyhp2eoltage is usually stepped up to 4500 V by a transformer and transmitted u 81zy2bv1l k-txtebh+i4.vp through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volt0 8s l .k;m/oohhbqo;mrn4;xwage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percloqs;ow8;.4bm 0o rmh h/nx;kentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces lk i748c3ozm6u qchyuei 9 n1b fx4u,.60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a u9bzeilc8i nuq1ukhf36x4. yoc7m4, power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resi ipiz8-uk3- iqstance of 0.60 W. A generator produces 100 3-i pkii-uq8zV at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a toto7e/v 1:3pnw/ lskuo9.j zsspal resistance of 0.60 W. A generakso1/ wl :up 3zv.je/s7n 9spotor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less :ez57dysfah*p;-pg w power would be lost dhz*-gppaf7 s ew:;5yif the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generatsr j8d/:uvtim* ihtarp q*(; 2or is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmissru/2mj*ahdqt i: i*(;rvt 8 psion is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the cowi; 2l hj1zexjukyf: jk08 x+4il's mj8;e2l zfujxxk+wj 410yk hi:agnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6ifhme (-hl,rsa96j 4+8gzx* y)ki 0oy*ysgqt.0-W resistor and an 18-H inductor. What is this circuit's time constayqzt h -li9o yi0ask*fr)gs 6hy8 e ,*+x(g4jmnt?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circmmw.3qib0 v/ z1:mwkbuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V 24/fe yitdq4yAC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is plac3+ncpk1-v :qbs,xpz 6pb ikk6ed into a 120-V AC outlet. What is the resistance of the lamp?iks6,v3 1q + zp6pb:cknbx p-k

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power sugru-,x + t3owqpply. What is the peak current throughu,goqr3 x w-t+ the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 12a-za0), ;1+tgwqwf x vg*tizj(byd p40-V ac power supply. What is the power dissipated i*xagpi vzyt), 1w4;j (gzat+bfq-dw0 n the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5;c 7da3qx4hvj:r2 gbv 0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W9axp04j,kz6x i7 c 9voalis3o resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rebb:m29uxyuw,2octewg j-+( ua g s1ywc 58ua8sistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH bbk 4rln7s3b ;inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.5ywg* 7l a:wsua 8p-b)h0-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductivak6u* zybni ah-,bt h+kb( +b9e reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactancecb8zo-j7) q+9 qip aqc at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencj;c9)s a n+jxry of 20 kHz is applied9jr sa+jc;xn ) to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hznfu,zci vn7ix78 .4 n;ur-rdu source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF ca) 4jm aupu:gyn3vf(2v pacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacea ;klqq+ 3;xiitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does g0wx/2h . 2paxnr/ 9lwnxqem*a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-b73nqxok , n)i8txz2diih uo. bs8uiw76 ,l 2umF capacitor be 100 W?iuq8iw3bislk, zuhn 8 nxoux 27b6do2. it7),

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz 3hepv p dmjll-4+5koqm:x.o +and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W rest y-fkv zv+htj s(n*h+,9my 5gistance, 15.0 W inductivt tygv9hm5fzv+ +kn(,yj*-hse reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 1zhqy hn-m5za))xp/qo 0l: o4 m00-W resistor, 20-mH coil, and 1.0-mF capacitor are connmxq:))zozn0-o4h pmya 5 l q/hected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500ycy.gt6khut4 g9// g9 lo: hqj Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in 9g4/6o/ :tqlggt y jkh9u.yhc series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connectedd(mqaq.i.71gebn.rx in series with a 20-mH inductor, what is the impedance at 1000nqx.7 e.riqmb. (1gda Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is conn)a.uhh ik6rhzqh . ):v7ttu;x-;zact ected in series with a 20-mH inductor, what is the phase angle at 1 at;hz -uazv)i7huxr : h.k h.t;)c6qt000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-+gn + 9njx1vxfmH coil and 1.0-mF capacitor for a total impedance of 100 W at+f 1x nxnvj9+g 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resis g06bgd h9w,5ga0 jzf2*w oqwdtor and 15-mH coil6 2wd gog qh0 zwjd*agb90fw,5 to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH icqhez s9s.a)id3zk 0ebl9;hkt9s ,7inductor at 5000 Hz for a total d)kis97hzc sa,9 s.kl0qz ;bte93heiimpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at cj wh nx))uv(eynib+v dt)3 3mzh;tsk/x8g)(1.0-MHz for a total (hvhxyz 83gmj3 )/;sdt+w)nkubvin(x) e)t cimpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Whategc/j k,zsv ;8+kj6y4d xhm(f is the impedance jsvf;6de4 m ,y z+/(cxkhk j8gat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed jy 54w9r*ywk-m vcc5xf+i j)tin series with a 10-mF capacitor at 1.0 kHz for a total impedance oxjwtcym5k5 4 i9vjcf)rw- y+* f 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series witr237fx(t x 7texhkb 9th a 10-mF capacitor at 1.0 kHz for a phase angle of x 3txtx9f2brk ( t77eh$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kbqx4b51t 0vbg1g okzu9 z/py+Hz for a total impedance of zgkpb 0bzqy15 bx1g o /+tv49u45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF cag6vq,++g;vg 8 q egxhcpacitor at 120 Hz. What is the phase angl8gvcg6 qheg,v+xq; +g e?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, a3rgsie zq ssy.dp 9 *u;p6y4p- :ml:ibnd 1.0-mF capacitor are connected in ses p:su mlpy3g4;69:ez sdrb*qiip. y-ries?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0a0b bxr;hj7j7 -mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms curj ax7 bhrj7b0;rent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitl),cka )tkmshe:sk8 5ive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flow 5)kakl8:e t)mkcs,s hs in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuits y/kp4r-j7z i1 cwyahs7j-t5 containing a 50-W resistor, a 10-mF capz wahy5j s7-ry/ ijs c71k-p4tacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 50 )9ki 8va;o0a9*jz3kdufhgao- op( db0-W resistor for a phase angle of uopd 3(f 9zvk*o oak a90iah)d8gjb;-$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-ot*. qgeqc//t mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum/t e q/*tog.cq power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistanc5ovbv.jwva ,i4k0 4l jv-)r ypo a9wy4e, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit j4.ayyk44opbvj 05l9wv,r aw vo)i- vis connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC chncwnkpwt*h1; r.4z,fbln() ircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What i//*zgz i3zvz64tm m bgs themz3/mz/*6b g zitgv z4 power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W t o97utauly4l+5hpg /a (pz6 gresistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60 yp4ztl 9u p/ 7h5utl+(gogaa6-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capac,8b-wj.woa7he -pe5 /bnevqd itor and a 15-mH coil in series? vb-,wbe-enep5h8o ja /qw 7.d

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed i6rj .* nslll-bv hzh59n series with a 4.7-mF capacitor for a resonant frequency of 10 klb. l*jlzn-h9h6 5 vsrHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series ls- m;mba u0-eggk7d 6cp,/zlwith a 3.7-mH inductor for a resonant frequencdl b cmp,g0- -kgz/ma76leu; sy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resisr p t4p0;2b)ka*r7qu4ir(iq 9qa ajhfxj / s)ytor and a 40-mH coil if the resonant freqp tr 0 (/fa ijs24qxqu;)kqh9pi yj4)arb7ar*uency of the circuit is to be 1000 Hz?

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