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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    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 units of magnef n((extktt+z20 ty g1tic 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 inductiono 0*u pxx-xshfa7q;z1 states that 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 of loog/z o2mfhm yo*:w5v2 ;2rcbsgps of wire in a coil produces what kind of change on the inv5fbm2m h*/y;:gcg o2ow szr 2duced $emf$, 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 mzvo 1,s st,ozf*d6jhuf(f2l 8agnetic field through a loop of wire produces what kind of chaf j, (2ho,fv *o8dsf6zz l1tsunge 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 kie9av lqie i8b :r*d.(znd of change on the induced9v dbeiz 8q.i: a(lr*e $emf$, 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 ma hn4 ;wh,jtmp;gnetic 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, thepj*p3chgqe:c;6tlo*ipu5 1ws- q tl - direction of an induced current in a conductor will be that which tends to pocs1ghq* e;u-wi jc5t:3*p6pp -lt qlroduce which of the following 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 liesj5f5;uz e3schg5 hwzye*63zz flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet u hfzeg*se56 33wy z;hcz5z5j 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 y, cgje5m+6s chymyu646 zh)kflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abovmke6mg+ 5,yzy)j6y hhsuc6 4ce)

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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 tab7tsrh4pzhx) 6le top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the szrt7hx)4 phs6ense 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 c(25 n, gmgxq*zew6 yyregion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fy2w,g*6nmx ce5(g zyqrom 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 a horizontal table top in a regiovjuzw7,g 7ha/ n where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fromhvw7, /zja7 ug 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 tammkd( kn 6 fhf-2t5u.able and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currek kd5t 6f2m uafmn-.h(nt 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 polenw.r5o/,yhy v entering first. As the north pole enters the wire, the induor/hyw n,. y5vced 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 spe ;,y lx)j)qnckt(6jx zed about an axis whose direction can be varied. In a region where a uniform magnetic field poin, 6jx;zl x)tc (yk)jnqts 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 constant angy 0j/rk-hy4 10 g9p dfa ;l)fb/ohul *antyq-tular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight fhgahlf0/t)ry/ q0p* l-4 bajt9nu y; ky-do1down, 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.q4jkq (g 4 ,*fzx6o9j rpm(9txe msvs0
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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 that 6cu bsbb -pz,704xynvan $emf$ 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 aa;4zpg5n, e,m ca 5clf 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 east-west direction) is move :q5kr/ -l8eisxn(bbfd northward at constant velocity through a magnetic field that kb/: e8 x lnbrsf(5iq-points straight down. Make 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 constant angular veloci*u,rdpc + j5a)3s naboty $\omega$ 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 generatori:e b 7du9r40*mdum3kcpzy 8i 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 through 60 revolutions each second. The frequency o kof9b/) stym/dvik3/f the m 3s9/t/ivoykfd k/b) $emf$ 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 usedb ppbz .*afy 9.*qeed/ 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 dev mw0ef e0e58wn.-e-qvvcvp y3ice 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 jdv,:- .6gkd aabhy2mh: )61ojtepfmcontains more loops than the primary coil then dkhyj2hj66::pg,1teoa fdmvb .am -)it 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 secondary ck0-ch+;jf+((+rs vwofl+axf txat c1e( qd v- oil thenl+ea+d ojkxv0fct(+ w(c-f t-h;+(a1 svfxrq 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 powx t 4 y,/cyk6pdwbl/hc1pn6u4 er 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 circuit,7 o6x4elpx mls9 pu8 /ma7s+;zdm gd9p

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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 g ;xktdow2:x: to an ideal battery of constant terminal voltage. At the mo::oxg;d2ktx wment 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 seri8 vz 6b3 pqh9vgj:k5s6*vne ckes to an ideal battery of constant terminal voltage. At the moment p53zg:s vvkkjv9b*6 c 8hen6q 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 re5eshpc,y2dlhjbo .r/151 g py sistance 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 indu;o0lzzl 1m 1kpctance 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 ton hxwot:5c((y a battery. The time constant for the circuit rep5t(cxy(w noh: resents the time required 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 inductor are connected in y y,ro n;4cg:wp)on7;dwoi a2 series to a battery. The battery is suddenly removed fromgod), c;2 orn :p wao;nyyi47w 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 except8bk *jnul /we):

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectedq9o7y(ut mu.a ( lzms7 to an AC power 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 c ypb*i2u7f4 rtircuit, the current24y p*7fibu rt

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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 3cbhsdz-/ h7 /nqp2vs changes by what factor when the frequency is tripled?b7hvs d/-hspc 3z/2 nq

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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 sfi u7uc156b9fh8kmois doubled, the inductive reactance of that indo5 bfsc9u7f hm186i ukuctor

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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 zero,utkgvisjc7 lm8+m75 )mwyg 3 1wv)li8 the inductive reactanc7l1vic)+g)kw 88lisywu5mjv3g 7 m tme of 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 y plu*1 )k1fojv7; gnz.0mtcr an AC power supply. In this circuit, the curren 7gyj)*nk;t.ocpru 10z lv1fmt

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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 by what fa30 +zzcn-ccb he2d f8h a8/jedctor when the frequencd +ecc z0 h2j/db-hnzecaf883y 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 across a capacitor approaches zero, the capojb .0xcd* )42tug buqacitive reactance of that capbbxg j * oqctud4.)20uacitor

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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 inductor and capacito ,kpq5 l)x. xf+kvqnw+r in a RLC series circn 5.p qlwvfkq+xk,x +)uit?

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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 circuo 0, wr)w wiynd18uzc0it 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 )zzt/9nt vl u*the circuit increases if R increases. When is this statement true?*)tluz9 znt/ v

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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; n5y rfrn*kwmrkan+(nin,08 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 series circuit. The impedance of the circuit incd (1xbwr)grz58 byv) mreases 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 L ir/ud .5wuw+oRC series circuit, the resonant frequency of iw+rud/5w o .uthat 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 vps7dz ;sa s;p/ 6j7)9nje qyd/4pzxm 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 serielpk jmpf7zgo 4o 217dk1o:g0 zs RLC 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 radius 0.10 m is rotating in a unifoy p8jfhfb-s; 2rm 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 pjy8 ;fbhpf2s-arallel.

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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 magne9r9s4j3 taa uptic field of 0.20 T. Find the magnetic flux through the loop when the pla9rp st 9au3j4ane 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 0scrg 6gg tt,8 -mk:s;d.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux t stgk:gs8tg dr-m c,;6hrough the loop when the plane of the 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 ,r7gu6 ra4lyy)kw4 x tsingle loop is 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 change9tn xj m +ga4q:dw6(exs from $4.0 \times 10^{-5} \; Wb$ 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 cm. A uagi+o z )/ye rq22i:elsj+4v uniform magnetic field is applied perpendicular to t + g/ e4jo)zsreayu +:2vii2lqhe 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 arep; p7f+8k qwlkd1v; enm.neq;a 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 aeh ri s7jrf;+ra- hk/:gp9bc9nd 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 whei*e1 ny h(z6v qgje/(cre the downward(1iv/ *z(qc ngj 6hyee component of the Earth'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 bari an*9 //6pzp.wci gqp that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through o /zi pgwc/n96.aqppi*ne 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 loops and a cross-sectionalx0d/0ri7*n.bl bjh o s 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 consists3fbu/* pp55lx i ho)cw3 lug1a5aud;s 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 $emf$.

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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 oln 8 6lsm:5xzzn 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 fieldx ll 5zzn86m:s 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 consists of 100 turns of wire of area by,o 5ef)vo;z $0.090 \; m^{2}$ 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 AC generator with an output of 12 V61h.x fzpp 78ondrsh : maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of tho6h :n8z 7p.dsxrh1pf e 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 maxim pbf-i9xbki *3um $emf$ 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 miw x;e4cy8j0+b,pzt.*l*8k fb lxowd otor 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 moo 3+/jxqvruy6giyo) e2i-3d f tor operates on 120 V AC, and when running at fullijory d-i2 )xeq3+3f/g o y6uv 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 a 24-V power 3csc 9fzf9bs3 supply. The operating current is 1.0 A. What is the3f9 bcc sf3z9s 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 internal resistance 6.0 W qmn8ge(9 s7cmis connected to a 24-V power supply. The operating current is 1.0 A at full speed. What mmg (e s9q87ncis 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 connected to a 1q2g c4xuwf0l5eiq n;e6o7 eylcd5 nm9o2qb 624-V power supply. The y 5oe eex462 2wn7q69l0;lcd5m1q giuob cqfnoperating 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 needed to reduce a primary vuqzu o:q15 jl9oltage 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:cmqd)bfc uxa2.*8 5jg/*9azd ady d b flow in the secondary. Hza :8fybgc/jaq cu.d9dx*)52dmab *dow 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 pry;iac3 jufy ,+ze1 u)zi;ub5ximary if the 24-V secondc)u;jy3ue ibfx5 ua i;z+y1z ,ary has 100 turns?

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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 pv;+ 43.hl2(bhilbbty*3 vqwof9 ibay rimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primabf3vi+byi b lbtyv wq9h .2 oa*(l4;3hry?

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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 primary of a transformcya2t0rb(y s5/ qy vn:j.s7z*z. uivmer. Assuming 100% efficiency, hoiy(z .v2:m q0 .ytyzuc/sar5*bj sv7nw many 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 1z 0i,y( .mtmqb j/4 tt-afyiba neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does thitz qb i (fy.tt-yjma/m4b0,1e 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 turns on its primary coil and 300 t 69olh*/fce57 )x,bz kah ghccurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the s7e6ccz)hg,b5cf9aoh* /kx h lecondary?

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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 turns on its primary coil and 300 turns on i4a73 zat+i)mr mdsle) ts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondarys)m)l 4m+ia73rzed at?

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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 100 turns and its secondary has d 8-5f: z5ojtqj,4uaqj v(ujd 200 turns. If the input czj-joj f5d5:jq u(4tu vda8,qurrent at the primary is 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 ha110h s) q6nak dn-rnqvs 200 turns. If the input voltage to the primary is 100 V, we can expect the output hvr1a0n-n6qqd ks )n1voltage 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 transforlyfe 0np*k /0vmer has 100 turns and its secondary has 200 turns. If the powflny kv/00 pe*er input 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. Tx )zk4 ,1gvzerhe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistr1k4ez x)g,vzance 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. Thek(,49 ;fxhj tjssrh/10)wdl eo: ixpaw lk1f 1 voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power t,pl hd e)xwsh:1w iaosk9;/flk0rj4 j 1xf1(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 a dp8-j lzs6p: tz7lms3t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not plpzs d s t7-8:3lj6mzstepped 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 5 +y-b2zfjz/zpip l 72/-echby0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduc2p h+l-iy72jz/y bz-f/ecbz pe 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 total resistance of 0.609--ajoceq+9 is ) wlqk W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the li-9+c w kqoja9esq-) 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. Hop .u;q3lbijl -w much less power would be lost 3-ql ;biplj.uif 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 generator is 440 V at 23i t,hd0gc08d/gu3;9 w syv;b wfjsyq 0 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 s0wtbdyc;d 3h9j8yg; ,sf q0w/v ig3u 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 5.0 A. How muc, ari0 j0fxqy6h energy is stored in the coil's magnetic fq f6ryix,j0 a0ield?

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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 containwiz9wgu63y7 *gz d9zk bb77xfwwnngl:d );) cs a 6.0-W resistor and an 18-H inductor. What is this circuit's time consta7 z w9: u6yb97x zcg*w;w)3bf)gl7kwngdi z dnnt?

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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 circul ddsmohu374( /ft .bkit 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 outlemi5):lo,hf 3wn zsarfp 4;h5qt. 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 placed into a 120-V AC outlet. What is the resistance of the lmzp, hn c ;q+yluc7f1 ca;uq5)ampn);+1uua7m,pq cclf ; zhy5cq?

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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-ncdb.m ka f3tg o9ls2so0,g9 ,V ac power supply. What is the peak current through the resistor?3tn k9baco ,,glgsf mod 20.9s

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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 120-v+aoh6) lo5dhrb08beV ac power supply. What is the power dissipated in thr6ovb b ea l0h)+5oh8de 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 50-W re;;r.2 z 0wey+eptgzdmsistor 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 1.b t a:l0f a0la0ocge50-W 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 resis4cjz s(o2* ygv8; zdlutor 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 1.0-6 v*0sz1m xmm)svej v7mH 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 reactanc+q kucru64 r(ae of a 2.50-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-m)l i;91.pps+bjiha gmH 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 of inductive reactance at 10treku7 1k4i:s 00 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 a5bx065,uvhz37rajvb3 k lrgy frequency of 20 kHz is applied to,kgrh3va5lxr b byu6jz70 5v3 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 j:w,.fx jqu :y -rbmf9a 2.50-mH coil due to 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 reactnf a 26sobh.77x ul:,dxxz8hhance of a 4.7-mF capacitor 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 ofjz7k )c7; flg(ld0gzrwzz8t( capacitive 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 a 10-mF capacitor have a reactance ofk3)gicz h9cm n:s3 fmd ;p)ka/ 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 rgbvgn( 3e iz91es+(xe9mvu7, he ox.seactance of a 0.010-mF capacitor be 100 W?9 ,3soe7 vem(bg9unvgs+e z(ix.xe1h

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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 and 5., 3*.q;+zeigk9cnmn y gmhn)u0 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 xg gau4,lhgd 37de w0iy(bj) )circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanceix)uy4d3g ew(7 )bgha ,gjdl0?

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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, and 1.y hy (em;prj88; ,x6op mgd3rp0-mF capacitor are connected inrpy;r mjeo, xd;6py3 p88( hgm 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 H /do;wjo ikc(cvwt)va1f klqc 3:,j+3z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sero3(+ j ak;v3wq :c odlv,ijwf c)/tc1kies?

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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 resistorh; *q2mp5w d:int0*-7pvcmv9bkj*qrl v0xs g is connected in series with a 20-mH inductor, what is the impedance at j7*9v:l0kpv iq 0s g2v5m-mhxqn r w;*dc *pbt1000 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 connected in series with a 20-mH inductordsg3hhqvnrz k q.(q (8/;h)gq, what is the phase angle at 1000h( h/kgh3(v.rqgdn8q;z sq) q 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 wit/not- p hqreu1nt t61)k,w1tt h a 20-mH coil and 1.0-mF capacitor for a total impedanc 1wnteth k61op-)q run,t1t/t e of 100 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 capacitances is needed in series with a 100-W resistor an+ y het:y;(ozmd 15-mH coil to get a total impedance h;o(:ztyyem + 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 indu / bu/b)rrifh 8gqek.)ctor at 5000 Hz for a total impe8hgi b)er/r bfu) qk/.dance 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 1.0-MHz for a tanx(nh8i - o-3uu wfi8mg)ac:otal impedafwi -)u ia-3:nm8gon8xuh(c ance 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 imfn1c l po1+ bn5+by8c zq,2vbs the impedance at 10005+8bfbvqn1n 1,m + c2pbczlo y 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 m.k u7t7uf1u;w1sr hls2:jzc series with a 10-mF capacitor at 1.0 kHz for a total impsju1t7hr ;7usz2c:lwuk1 .mfedance 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 serieu:f rz*gwy/kz ehr:(c7xg- r6s with a 10-mF capacitor at 1.0 kHz for a phase angl-yzu rr:hx7ef :kg/czw r6 g*(e 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 nee2mtlaw -4mby ; )2;wfgb*. z.ai tpgazded in series with a 30-W resistor at 1.0 kHz for a total impedance;l mtf2m gbw )ta* zya-iz.w;a.2bp 4g 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 capacitor at wipd45 c db6z6120 Hz. What is the phase anglb ddpi46w 6cz5e?

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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, and 1 k)f-kjc1rqf 9 nop/.k.0-mF capacitor are connectefq-n)krkco1.k / pfj9d in series?

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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 100s5fd do(1x 0 xvr)4ylf-W resistor, a 10.0-mF capacitor, and a 0.35)dd4orff lx 0 y1svx5(0-H inductor. The circuit is connected 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 reactancejs8m8s *;bsr i 30 W, and an inductor of indu sb8ris*8sj;mctive reactance 30 W are connected in series 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 angle fo v(cs ll3+5p*8d berlsr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductds( vspc3+r l8lb le5*or, 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 neczs *wn eci; rvn18lg)1im/ vr(essary in series with a 500-W resistor for a phase angle of mv si)1wvlnez1r gn(/ ic*r;8$40^{\circ}$ 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 wha l3u*koenheo *85kkqlim5-a,/9tn dyt frequency should the circuit be driven in order ty/ u3dhae -q8ko5mkn tn*,l*eo5 k9l io have maximum 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 serieqhdp ;s64q yv;s circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when t;4hp6ysv; q qdhe 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 circuit0q;q himuv3 :)1kqvp6qt)3 ok7t s vktyb:4 lj 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 hjn5v ..w2gpn d h6k(rd:ur 1faas an impedance of 60 W and a resistance of 30 W. What is the powep1.(dhw5r :j far2 v gu.6nnkdr 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 cir;p mdir um6fw:k9 4rn2cuit containing a 50-W resistor, a 10-mF capacitor, a;2mru:49nmkdrwf 6pind 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 frequency of a 1.0-mF ,)dg/sckq8 aqe) hh z(n3zf:fcapacitor and a 15-mH coil in series?fz(c 3s)e )qkhfadq,gn8h :/ z

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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 nc(y0zf8 no 6ua resonant frequency unc68f( y0 onzof 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 for a resonantgk o yd +c9s8uj/n77jg freque 7jdsjg+y978 nc/kgou ncy 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 re ey(nj b0p/w0qsistor and a 40-mH coil if the resonant fen0j y(qp0 w/brequency of the circuit is to be 1000 Hz?

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