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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  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 unv , t37cnzgs4to rk6u6its 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 te5zjsx:i, xu.he $emf$ 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 of/ehy xyu( (*knuvq. yu7r+tu( loops of wire in a coil produces what kind of change on the indrxu/yq (u +ynt7u.yv(hkeu (*uced $emf$, 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 lg2(zjb6pnu m,u l/ cd3oop of wire produces what kinludb3/ 2,(g uczp6j mnd of 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 loo p4mutgo913*ku2 o yxu n(d1k1pid;h lp of wire produces what kind of change on the induced u3d2;ug mn 11pho*yd1o94xl u( kpkit$emf$, 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 magnetic 2 *os- kc6 j4i fp;iue5hpd,bhfield 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 directi- eg,mtaw7vf3 (j:fczj0s.)qczmlv7 *oluw. on of an induced current in a conductor will be that which tends to produce which of the fzv (m.st7 cm,gf acj:3)z7 *wol.eqwvl0j fu-ollowing 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 table. A bar magnet is held above itss ug9;g0,bln0 fzny 1d center with its north pole pointing down. The station, f;0 s1zln ygun9g0bdary magnet induces (when viewed from above)

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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 flikp g3h;9 wum0at on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approuhm 9i0;wk 3gpaches 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 nnh:qskyce(m7 :) afmm 4s6/cor points straight up. The magnetic field vanishes suddenly. When viewed from above, what isca:(sm7:ny)mmcqnh f s ke/46 the sense of the 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 6klpnx((1x *x vp:y2,y sjchn the magnetic field vector po*2cyjxp6hxvk,n(xn sl 1yp( :ints straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction 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 abmmws slu()*co b -bk13s 65ua horizontal table top in a region where the magnetic field points straight down. The magnetic fiel6lsa3 )5cmss umuwk-(bob 1*b d 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 a horizontal table and carries an ever-increasing coemf) w/2:u 47 qcqq uve.xv9surrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from aboveq4e) u cof/s qv97:qe. uvxm2w, 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 north pole enterin,wq hsy ;5esth yx77/e5t tmv(g first. As the north pole enters the wire, the induced current will be (asyt e/7hh 5 ts7( yv,tsm;q5xew 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 axiscv*. wwbm3q+t/evvv - whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation i t3wvcb+q vw*-/v .emvf 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 rotatech8w4xis , .cxre*6 3vh2 sqavpaxw9/sd mf4,d at constant angular speed about an axis whose direction can be 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 c4 a8 vp,aq 3wsxcvdxei9s6 s 2f4,rw/hxm.*hthe 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.yl+24b)di9vx he r0nt
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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 tha 6.)a1blmxqfida7rn)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 ao /zd g2u0t9 sg5jzc;b magnetic 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 the eastef94(kkl 5f yf6 fjz(uw67h* 4k1mu.vidjk i m-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inducek(i u h76 9f4kvzw4kmiu65(fj1*fjf.ldykmed 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 rovf6 *evb er4c1tates at a constant 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 generator transfo)gmo,xq9 n nfeimz 8+5:n,eyprms

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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 th7c4u 5w7arn:mlg n (fhrough 60 revolutions each second. The frequency of th7 fuan 4:h mnw(c57rgle $emf$ 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 deod(:ic p7y5dpix17yr gy1*le vice used 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 device t(qvag y b,d;)jll s umlaxo/-9+k91vphat

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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 theh4ry0xyr 0 q+bj4u u68c/c en l7mfit2 secondary coil contains more loops than the primary coil then it is hr ut0l +nicfx06bc48/ qmj2 yur 4e7ya

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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 con/d)o fmq o nms4ult-1udb9h 4ly01v g0tains more loops than the secondary coil then l yufqmdu/th1 4do0sbm1o9l -)g4 v0n 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, the power inp tlg)7owvg j2ne6 2m/uut

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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 resona(yh ),ywbywaut7, +a znt 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 series to an ideal batterh0hsm22l5 mcqq. 2f*zv8u wvdy of constant terminal voltage. At the moment contact is made with the battery, the voltage a2qz * h5qhf .cdvlm8uv0w2ms2cross 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 of conh+pu 2x qg 3w./vl*qpystant terminal volt*v3l/ygq2+qpw ph. xuage. At the 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 wiu ,q4(/w.qxwwcyj) rcth inductance 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 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 inductance L and resistance fotbr4m9 pv30 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 ino.e -x75 zwlns6yo5il series to a battery. The time constant for the circuit represents the time r-xweo7 ln6yz5 5sil.oequired for the current to reach

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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 indg,2w 9azzbr1xwk8 km*2i. b gductor are connected in series to a battery. The battery is s9bkz*b kz8gwa1wgr .ix2 ,2mduddenly 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 sam-9i*u oi+y st.8j i9 ca3nqljsxmyq46e units except:

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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 ge: qz 6eh:u9lpower supply. 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 circln -f30b)rg gouit, the current)gfgn0 -l3bro

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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 factoz, fl u- bj6)royj3e, yglkq;0r when the frequency is efb,jk6gylo ;y-ujz rq ),0l3tripled?

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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 an inductor is doubled, thep 5f,pt(x5cu b inductive reac55u(,pcftpb xtance of that 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 voltage across an inductor approaches zdv njp. 0+/or v(m +wh4jhws/vero, the inductive reactance wv. hw0 +oh+/4vsdj/ v(n pmjrof that coil

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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 to an AC power supply. In this circuit, the curruzcg9r 77 9ydgymmc+5ecym7ygc9 7dzg 5m9r+ unt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes c8d3 mej;h yi(by what factor when the frequency is tr( 8j;hm idy3ecipled?

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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 across a capacitor appro0 5np7kc 4az; 6zz4nmww osv1saches zero, the capacitive reac54va komn;z1c 7p sw6zzns0 4wtance 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 voltages of the 4u7p* 5jz0wat-c,mrdt 7l)z mj gs2xfinductor and capacitor in a RLC djzxmtr7)5m7gz,w*js 2 4lp af-t0c useries 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 an RLC circuit is defiks0qdu f i2e*y dpo0f0v 0zk+4ned 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. Thh2a+u4 ew l8q hm,nsl4e impedance of the circuit increases if R increases. When is this statemeqn24alh+u, whe m ls84nt true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circd0m rf.kph*lw7ftzw8 pfi.+5 uit. The impedance 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 seri5z3mup 8pr lbzo+jl 6w4pr3d) ka36 hces circuit. The 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, thnaq cspr9 e05+e resonant frequen s0r cpeq95a+ncy 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 circuit that is driven by an AC3vnt qbjt2x, , 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 RLCsu)f( m *b5vdi circuit occurs 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 ra2io7kg9it4inrkt (. a dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the gti4a. (o7i92nk k itrmagnetic flux through the loop when the plane of the loop and the 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 rotating in a uniform magnetic field /qpl; d (1g8tgjrx9 xiof 0.20 T. Find the magnetic flqxi;(j8l1gx9p td/ grux 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 mvlo* u5k1+8a4ahhx a b is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thhual*a ox v+ka15h b84e loop and the magnetic field vector are at an angle 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 i,cu bthi/ f6 h9hegjm* -ix*1es reduced from $1.0 \; m^{2}$ 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 fkk5; tx),1h+w1( lwv xpfb jbzrom $4.0 \times 10^{-5} \; Wb$ 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 turns of wire on a square frame with sides 18 ) x/p6yjn n0 1qyr7i e hb/-cpcm,uc+hcm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find tpy ,hb/m7ihp cnx/nc c ry-1u6je)0+qhe 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 ar1/ ur1o7gh8p gru 8ydiea of $0.40 \; m^{2}$ 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 area 2c wfrs h6xyn, rgh0l n5r0,n.$0.20 \; m^{2}$ 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 hori1ci t1ym z-k wq6pb.b5:wr)hx zontally at a location where the downward component of the Earth's magnetic fieldh 5 ir.1pwc61m-xwy:)bt bqkz 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;wzbz 9iga 2cm.q6mi 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiq. gicm9iwza2b ;m26zeld 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 loops and a crosse3zwxm xkj1nr(3 w91n-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 turnsdqz. 99ki1srnw(e.igw qs: l 0 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 $emf$.

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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 loops r6 m8s 0d:oycy ,d0rmxon its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel 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, m8,m0 rdc:yx 0d6o srywhat 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 consists of 100 8rgdjp) 2vfho 9jko+6 k0wkx.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,m p ybly;e h4u(.vbrj.*.b th construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availablev ut.*hy4 (lye;j,bp. .rbmbh. 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 generatw e2iqr95 5phaor with a maximum $emf$ 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 motort4 lxpx4xw;3j,/9nz xd f u(kf operates 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 motor have a resistance of 6.00 W. The motor operate4g msi+:u2ju ys on 120 V AC, and when running at full gisuy:u+42m j 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 resistance 6.0 W is connected to ab(qb +rf+ ,dly 24-V power supply. The operat+,l(b +fryqdbing current is 1.0 A. What is the start-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 internale+e1o1j5* r(j.ytez,p z 00udp ttt ds resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back 1j z *(ed5rps,t1yt zejeu.d0o0 t p+t$emf$ 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 connected t;.tlpe9 acii 3o a 24-V power supply. The operating current is 1.0 A at full speed c9lptai3.e i;. 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 needed av2v+ uk7w0qju *4y9dpvb0-waeg3 ywto 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 flow in the smig6 11wde kmcm*).xjecondary. Hok.egim1x6*d)m wcj1mw many turns 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 if8r1.v1w ql x*yy/s pua0q1do s the 24-V secondary has 100 turnsulyx1 do 1v. 8pasq*1qy/0rws ?

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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 gem b .d3rwuwrch/ de3 2;0yd)primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 ) mc/ hw3.0 dbye;w3ur r2dgdeA, 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 primaryvc*. hw96qd5r fgt gs-iir t/- of a transformer. Assuming 100% efficiency, how many5q9 g.t- w/*ihvit crr f-6sdg amps at 24 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 provides 7500 V at 10.0 myj9zlc/0(q-*ka bgo dA. The primary coil operates on 120 V. What does th9b(l0jyza o dc-gqk/*e primary 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 tu v vnod9:k31wj,8z xtl2o upe2n14ls zrns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primkv1ezonnzs1p xwljv :dtu2,l 2983 4 oary, 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 transformer has 60 td 2d g/) r3yb7w(irraburns on its primary coil and 300 turns on its secondary coil. adw(7rbr gy2 ir/3)bdIf 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 transf*.r ;, dhlwodl. djtx3gf,to2 ormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outpud t;lx2*.hgd3 .,wlfdoo,jrt t 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 turn8i/d x6 h3qzbvs and its secondary has 200 turns. If the input voltage to the6qh xvdb8z3/ i primary is 100 V, we can expect the 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 1*cc0akdtp8 g*xge .0io.8 isiq kx 6h+00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglex6i .i+0s .oikh*g 0e8 gccpk8q*xadtcting 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 voltage ll7l vle)xn-.*k -lu tcw6)gwis usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the l tle7llw n)xw)6.gk -* -luvcsecondary 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. Tcopeddqjd 75l20ye 4;x 0d7 gihe voltage is usually stepped up to 4500 V by a tra70l0o7jdy idxq;dgce2p45de nsformer and transmitted through a power line of total resistance 1.0 W. Find the percentage 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 60 A of current at 8 m,wb 2vtdosup u:n75120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pus 7d8:v 2mbn, u5woptower 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 resistance of 0bec vt*67qc)o6m-h er0bw 7ts.60 W. A generator 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 c 7e7b*qr-w6t0t sm co)v hbe6original 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 br ylse1ch6n f0vq6n d5 qx /3rlas.3+has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy losscflsnb6.+qvr la5sn yedq0 h 3r/31x6 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 power would be lmf j ;ean30tnl(4jwt,ost if the pot3nn a4mljt,;e w(0jfwer 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 generator is 440 V at 20 A. It (xp7 r prb6s7jis to be transmitted on a line with resistance of 0.60 W. To what voltage xrp(br776jsp must the generator output be stepped up with a transformer if the power loss in transmission 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 5.0w93q4+ibo hynuc3p j2 A. How much energy is stored in the coil's magne4ocy p j9uh+w b233inqtic 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 6.0-W residljqpldj 2z)jn.fs4int n0r qf01.s/ox55- s stor and an 18-H inductor. What is this circuit's timel)sj.psr lddz0x 5o 1ns20 tf5/.jq-n4nj fiq constant?

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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 voltageho)fa.r0:a zb in an AC circuit 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 AC outlet. What is the peak currentp1bprw(85 wh eq +iqp3jqwc -7j+ijy4?

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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 placed into avz:sz 2 z3grl8 120-V AC outlet. What is the resistance of the lamp?s zr3g28zl: vz

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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 conne,p9euf)e qs)a x 53wpm,zclh :cted to a 120-V ac power supply. What is the peak current t lw hcm35:qsp)x ,z9,ue)a efphrough 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 12ple8am gk0 ck6:*y v5-a z5/ biqliuo:dg3vd20-V ac power supply. What is the power dissipated in the resistor:bgp:/vi 8ed3azu5vaim* 6 kq0c-2g dl5l oy k?

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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 50-W resistor isu+h5-zsl :os ); dt: cvr8cyof $I = 0.80 \sin (240 t)$. 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-W resiqaw 1r2r)5t custor 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 resistor is5x.vpffem5w 8 $I = 0.80 \sin (240 t)$. 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 ) :tc6 xddx3ijt,3sdrof a 1.0-mH 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 2.50-mH 9q w +g9cm+sqhcoil 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 14.0i/5c-l4fg ij r9ie:rf-mH coil have 14.0 W of inductive 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 caau+ -cswvn uup ym2* g2 g;)kvj0:v+of inductive reactance 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 /7kbkj s5zjg7 (aji07;mx 1 whiwwd8xw6vdx ;a frequency of 20 kHz is applied to (a 6jvk0gdjm ;xwhiww7; 7x/dwxik5jb1zs87 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 3;sy e67yeqse8-fxu tto a 110-V, 60.0 Hz 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 capacitor at 1518sjmppib0*ic3hty1b ve/d a ma)k90 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 capacitive rnznq3)a *bnsobf8 f2mum9p(5eactance 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 a 10-mF capacitor have a reactance of 120xv:wq* iy9+ he0 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 s(z1jgx/t da3a 0.010-mF capacitor be 100 Wsgdtz(x j/13 a?

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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 a :kpd9mf3. rv:rs0wswt 1000 Hz 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 xvvbl*m: +jpx3(wpt46vkl a :z25ajt resistance, 15.0 W inductive reactance, and 10.0 W capacijaxp vt t j*vl+5:4wpv3 l2(z:x6 kbamtive 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 100-W resistor, 20-mH coil, al;3g0* skbh/5ceo vunnd 1.0-mF capacitor kln ;v/3*cuog5 s bh0eare connected 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 1500 Hz iobg-imx ,we*)cru5 a0 f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connece -g a,ouwbmxc*5)ri 0ted in 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 connected in serc,z dixpz .pt952s6jfies with a 20-mH inductor, what is the impedance app i 9,stzd5.6fzx 2jct 1000 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 conne1vmw+-q m ;jfxcted in series with a 20-mH inductor, what is the phase angle at 10;1j+xvqmf w -m00 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 b0 hzt2 vucz)a3l4*qy with a 20-mH coil and 1.0-mF capacitor for a total impedance of 10 ahy 0l)*cbvq4z 2zut30 W at 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 capacitancesv8nvv 3+dx lf: is needed in series with a 100-W resistor and 15-mH coil to get av3v8 x:nvl +fd 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 inductor a2agp dch2o5b:wkvaek ,4:v( p t 5000 Hz for a total impedance of 4:w 2vgahk2de:( b4p,opkcva50000 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 1.0-MHz forq jr 7aw0tqz1m8gme.9 a total impedanc1eq9 rjgmq 8m.az w70te 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. What is thr-am3q4 i- cjbe impedan34jc --ib qmarce at 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 in series with 2zhgih3x5t g) em3kf5a 10-mF capacitor at 1.0 kHz for a totalki5hg tx32 hm)ef z5g3 impedance of 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 with a 10- ,kf1g 6eno xlfm9 (45mfavnr.mF capacitor at 1.0 kHz for a phase anglem5lf1(xenmg 4fno,av .kr 6f9 of $40^{\circ}$?

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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 1als)o;n1+lv sub2m2:rkn tz7e/jr/ g .0 kHz for a total impeda+ r2;n lmbues2zos jv1 / an/rtlkg:)7nce of 45 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 ca zbr hnv*kl8 ,m: sjts fk5uo2dx/+e;5pacitor at 120 Hz. What is the phase anglez5,x:f kks5slt oh b*jv8dm+; nr2eu/?

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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-p7vo4iasewk/jp 1knf *4(f 2 mmH coil, and 1.0-mF capacitor are connected in serie *ena2 4k1ops 7kmivf(/ fjw4ps?

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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 ofz3 m7,yzj+uw aw0 nsv1 a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is conj7mna 1+vu3y z,wzw 0snected to a 120-V, 60-Hz power supply. What is the rms current 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 capacitive reactance 30 2/j8 5ytnprwnW, and an inductor of inductive reactance 30 W are connected in seriesnpy2j8n wr 5t/ to a 110-V, 60-Hz power source. What current flows 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 an ugt5p87bt/xagle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz puag/ b58px tt7ower 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 500-W resistor for a phwo.b 7sg)c ys-ase angle oy sgb-7)s.c owf $40^{\circ}$ 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-mH, C = 10.0 mF. At what frequenlemp(q6+6f lo-c p6ezcy should the circuit be driven in order to have maximum power transferr -loq+fz6p6c(p 6 mleeed 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 outpu *yuf-d:-uzt82yo jh pt in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, azt28*: u o-yfdpjh-yund 10.0 W capacitive reactance, when the circuit is 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 circu pr uiwd8i/ach2 (/z-jit 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 andongp6s78r ( lo:hc ,+kam3h nn a resistance of 30 W. What is the power fact a rospn8hog,3nlm hn6 7c(:+kor?

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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 factorfo5+f0xo 3xdo for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor,o5 +oxx0fo3d f and a 0.45-H inductor, when connected to a 60-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 frequentnv2.qu 8 fh6wcy of a 1.0-mF capacitor and a 15-mH coil in series?fwh tq.n86 v2u

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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 in series with a 4.7-mF capacitor for a resonant freqr /84wzxq2ubql)9m:e pjx 7 xduency of plm)bqx4xxd/ 79re 2 8jqz uw:10 kHz?

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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 with a 3.7-mH inductor 7f axqztoho7 .w /-q1om+c -uxfor a resonant frequenctfx7 oqcw17-hoqzo ma- xu /.+y 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 resistor and a 40-mj+: 6p zgz q9xh2q1vneH coil if the resonant frequency of the cg1qpe zxh:j 6q2zv9+nircuit is to be 1000 Hz?

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