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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: 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 units of i6ljhr7 r3/5 ms;wvnvmagnetic 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 5ivnid(x)i ome/ru y 7)ffv y,8b s)e1states 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 loops of wire in a coil produces what kind of cham lr8 ,blt8 rak0)okm;nge on the k0t allb;r8mmo8 ,k)rinduced $emf$, 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 thitvp57rl7iw 2rough a loop of wire produces what kin5wi2 l7tvpr7 id 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 loop of wire produces what kind ozq0/.kr0dw)tj 9 0b5h.e fhi m vcci6i*ti jf0f change on the induced ii0jk5c *0 h h.ti) e90mdf0cj.qbvt6wfir /z$emf$, 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* -q1ect v:pq.c/fbbu/cpv/ r 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 rli l 3oq:8 v6e-uxom)wo) q2tinduced current in a conductor will be that which tends to produce wh)mt3l)- 26owul o8 xrie: vqoqich 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 lies flat on a horizontal table. Agj484gssp n0ud ;xe;w bar magnet is held above its center with its north pole pointin n44s8 w; pej;sgxu0gdg down. The stationary 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 flat on a horizontal table. A dum w2i/a ,hozz(x,+gbar magnet is held above its center with its north pole pointing down, and released. As it w2z dmu,a x/(g,hz+oiapproaches 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 in735 3f lhg4zh5xiwa iexz j;o. a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what o 4ahx535w.ih leg x7j3 izfz;is 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 the magnetic field vec;g 4jyk-.g)m hr5 rsp13mphx wtor points 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?.gxr mr1pg5-h; ykjh4m)wsp 3

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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 region where the m+v,/nrn*jt v pagnetic field points straight down. Thevp,vjt rnn/+* 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 a horizontal table and carries an ever-inc: dyacu42ivdb2 + po;creasing current northward. Two coils of wire lie flat on the table, one on either side of tha2o 2b;4p cudidv+ cy:e 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 north pole entering first. xmx 1q mnpc jad(r4hwlry 3o8e5; fkex.)10/yAs the north pole enters the wire, the induced current will be (as viewed f )3e8drce/a;04l kfxyxm1xmo (.wj1nqpr5h yrom 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 rotate(l*pn2l px 60i)qtthuwv5*kkd 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 buxphkwl6t0* ( i) v5 qk2np*tle 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 angular ;)mn*sf eabk31u lvn c,0rk,nspeed about an axis whose direction can be varied. In a region where afrenk,b3n)1*vnlsk u m c0a;, 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. 7bql5a7tdkcn x z42z*
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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 2h y/3a6cb 0mnflk(eto.ln l6an $emf$ 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 magnetic fields3gp j/w0 a5zz. 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 in1te59tt m6tyjs-a 0)ezs h3 qv the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Ma tsa6e t1m5 vsh3tz9 yjetq)0-ke 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 r4uq;dbg. fwfuax2-w6 u* )kzqotates 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 n i:3)ju wetq0 /y +ne54wbwgttransforms

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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 th kitglr)y8:0 i94 45eg*bmcofon2zs prough 60 revolutions each second. The frequency of tzyrf4o 9g 5g cp:btik4)n02so *i8mlehe $emf$ 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 devicbf patr h-5z4.p(k- xxe 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 -h :nq:70v.jyzzat dj 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 more lo plp7giupxf9d nrt1b8 +w1a/7ops than the primary coil then it is ap7w+db8pfl t arxg7i1 u/9np1

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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*ukjue )oii6aq6o ia4tu j1g* id/wd */3x8vm secondary coil then it is*t/*daxv auu ii i/61jw4d)ouo im8eq3*6gkj 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 input t me+jo;5fxl3

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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 circ jqb74si ,pd0vuit,

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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 idect+e opqd dozq3)jik+b ldh ;.*i,t3)al battery of constant terminal voltagp+ d)z3.j)qd*i;h o doeqcb3+it, tlke. 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 seriesqgvl5 aswu+)/ to an ideal battery of constant terminal vou+) l v/swq5agltage. 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 with inductance L and resistancep- tujy*e-k :ch+a7f l 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 Lqwui8biso 6 6j o t1w/68.vaur 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 connecw j3e 93,gqepoted in series to a battery. The time constant for t,33jqp9eo wg ehe circuit represents 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 series to a battery. The y *i::dpb:)sj rx1gfcbattery is suddenly removed fr:)dyfxr:gji:1spb * com 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 exce1oeky+v v88o6 tamz(w pt:

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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 ,jz ypb gxg13,w)sf) bsupply. 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 connecte rjl9n:h/:yra 3t .zze)-cu ald to an AC power supply. In this circuit, the currenhez-zltuj n9r c:3)yar.l:/a t

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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 the-eb if*q 0gin+le1 )mn frequency is triplqlbn0i-me) ei 1g*n f+ed?

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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, the indn:a b2sm4; p/omx l)n.rt gio )g+hba2uctive reab)2 gmblan:o xiag+tr o) ;s4.n/m 2hpctance 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 iu k34t8 /jskdlnductor approaches zero, the inductive rs4kkjut3 8ld /eactance 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 an AC power supdj f.5u01jhzziwnd*w cqb69 , ply. In this circuit, the currecdfhqj 1 ,*.w5jznd0b 9zui w6nt

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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 factor when thfrtm9 kn cqt *94by:1ve frequency is triplevnq9:*9bfr km4tcy t1d?

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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, qk2mm;:jk.rz the capacitive reactance of that kmq rk2;. mjz: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 thu 4zvg2y(1cese inductor and capacitor in a RLC seec2 svz(y14u gries 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 circ 0q0vfaf7;ksf)wil v2, -lzj buit 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. d df ,rmg(,3 wcsl*j/.5ckeg h The impedance of the circuit increases if R increases. ,5* lr ksce.cwg/ d,dfm( h3gj When is this statement 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 circuit. The impedance of the circuit z7 .b2 hkz)uvmincreases 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. Theig,9n +tc1t 0bljo.dg 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 ngz6j :m/w2e pLRC series circuit, the resonant frequency of thatwmz:jgnp 2/ 6e 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 tha ml8zb ;7) ;tkrqw v3pw4*azlnt 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 serie)f v0l8 : 4wip zk4xhi6assec4s 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 0.1 mey(y9ap*9-8l(l skzjelyp 60 m is 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 parallelzk*(plm(a8lp9yej s - l96yye.

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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 unifool cku*cmp6 9;bdx1jf 6*l7we rm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ef7p w1cc* b;l*xukod6m69 jlof 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 is rotating in a uniform magnetic fup9,rto 0b e(wield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are a b9to p,0ew(urt 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 are ahp-p*yr0 hik+((ix ha of an adjustable single 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 cs 5+nczsl. qudri ge9v0r-92toil changes 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 sidfn 8k o ivu/ya72+fv2les 18 cm. 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 the average value of the induc i a+ kl7nyvov/2ff8u2ed $emf$.

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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 andxw.t/fv6q.(twx * tw l an area 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 are5l refc/hqj +b /6tvv1a $0.20 \; m^{2}$ 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 tg e7k+pn zv5:ho0o: vche downward component of the Earth's7 kzen v:0:gco5op+v h 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 zfg9-c ye0mu(rpz:)qm long rotates at a constant angular velocityzupc e9m-() ryzfq:g 0 of 2.0 rad/s about a vertical 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 loops and a cross-secti4o-+9lkpb 5fepg kqr 3onal 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 f*7 rf1bq2sn rturns 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 on its armature. Each looc yy o:j5r3+swp 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 perpend cr+woysy3j :5icular 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 g 9 dt2euuano-9s5xk/m /i2d dturns 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 tovxv6/uo r*xsy1h3ra / construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field ofv h*x/syo r13ruvx 6/a 0.050 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 generatxt tfr7e ni0jmkg7g x( x)*1n)or 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 opief722hjue mw/i7 ns-; us8pf 6.00 W. The motor 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. Tooegw81w-9wl 7; fmuqhe motor operates on 120 V AC, and when running at full ;87eq go19w-u wwo lfmspeed 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 iat 1c5.moes vc. g3n fxv5h n2ev0;8mss connected to a 24-V power supply. The operating current is 1.0 A. What is the start-uc e5.vfg1 v5sam3c nhm02.nstv8o;e xp 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 resisx u8lq8vm .,6hodh*qstance 6.0 W is connected to a 24-V power supply. The operating current is shmq 6v,8xo*h. lq8du 1.0 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 connected toxc mg0k v(sf)( a 24-V power supply. The operating current is 1.0 A at full speed. What is the b)f(gvksm0x ( cack $emf$ 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 neeug dhmv (6 okm2sx +who*(7xi,ded 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 70tkbk 7bbaq 48g- gpmcauses 14 A to flow in the secondary. How many turns are in thp q7 takb4m-g0b8b7kg e 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 nelv a mr+4x l+ nm4-.mbxn-qe)ycessary in a 110-V primary if the 24-V secondary has 100 turnm.y-)ne+4m4 l rxq xa+lmb v-ns?

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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-tg;cct*uco/v f t3 au,*urn secondary coil. If th3 tgfctca/*uc*o u,v; e 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 primary of a transformer. Assuming 100% e susagq*y .uk4wyy, -1oced1 1cu t;,m0by*lefficiency, how many amps at 24 V can flow in b1ol;scdugew1,s tyyy qkmu* c*-. 0auy1e ,4 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 s e yld9a suwvndiv90*q(;us8;ign transformer provides 7500 V at 10.0 mA. The primary coil operates on ;s9da(qny eu s*vwv8 u 0;9ild120 V. What does the 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 turns on itwjngu+e bo+k: f tby*55)ata,s secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the s )5g+a :nk5 eb*ubow+tj, aytfecondary?

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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 pafj;95lgi, v/vn) botrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thej;vv/, 9fnb alo)5 tig 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 100 turns and its secolwn p/*yh,wpj/ gt 3f4ndary has 200 turns. If the input curg jph//3f 4lw*tnywp, rent 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 has 200 t , idl)tl,mzz 9r2l8 yeh0k6ciurns. If the il i mrl6zhzt8l c2e,d,)y09kinput voltage to the 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 100 turns and its secondary has 200 turns. If / vat4nin/6b xd/ aq,fthe power input to the primary is 100 W, we can expect the power b//n/a ndxaqt,vf6i4 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. T0/n)u s9nlb0o mxrk li7g y;u9he voltage is usually stepped up to 4500 V bylox 0) l9 70m;iurgb/un 9skyn a transformer and transmitted 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 voltage is usually steppe d5k)l dnd3zcl3j)cuq1j(3o bd up to 4500 V by a transformer and transmitted through a power line of total resistanc3kcd n3(1l5) q )ojdb3zudlcje 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 120 V. The voltag0 uxs9z0am88,k q+xeu s9wue fe is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. asu9ew8k9uum fs 0e ,+qx xz80Find 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 liro3r1 4 olsnf-5 ilbn-j0pvh; ne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy lonjo5o prlnh0- ;b1s 3filr4-vss 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 longj,()rkk1*mke es oq9 t has a total resistance of 0.60 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 original energy ist(mj *k,o9krsk qee)1 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 ell(30 1scv .tamv7cva 6-W line at 1000 V. How much less power would be lost if the power were tranvt0v3v. m 1le7c(alcssmitted 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 is to be transmitteonx klo6j ( qjkkl0ork0l63.(d 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 transmission is not to er6ko k(. ok lj(o0k j3lq0nxl6xceed 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 curre5 4(8l3hni/k.koreo+tw yy kmnt of 5.0 A. How much energy is stored in the coil'sthye 4k 8/wn. (omikl5ykor3+ magnetic 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 resistor and an 18-H inductor. Whv k b*gl8w8s2pat is this circuit's time constant?p8vl*wgskb 82

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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 voltagefd-p sosf.42 nm 4n-hd 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. Whdjznu j6ig,atda+t d-mj:n-9i 60:s tat 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 resistanpii/8os4dtgl ; f(/olce of the la/g/;lo(di s4 t fpoil8mp?

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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 supply. What is t c69o1zyl+aw+j6oww8wi 5 ofo(iy 8i she peak current through the resisoa 18yiz6+6 w8y(+sl 9jwwi5ofcoo witor?

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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 connel1+ q5ipornqsjx0 +: cs vy9-zcted to a 120-V ac power supply. What is the power dissipater05vqx + + 1qyijpslsn9zc:o -d in 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 50-W resistor i vveu/, 43nbrgj)xaq8s $I = 0.80 \sin (240 t)$. 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 l;o70ojc0 fsf 5e*0pbll yu)w 50-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;7e / wkjl3arx-W resistor 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 reactancxt-3udm oq. m.e of 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 reyp)b:pmv y m1fg.5t (xactance 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-mH coil 7iljkkwr(t. ;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 i y+wp+c j3mf0vnductive 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 pu5 k3vd+pdn1+efluw*9l( e q*amym +AC at a frequency of 20 kHz is appliedauk5 m nue+fpw+l p*+1 e3d(yvq d*9lm 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 throf;2 vctd 7* vk7+kugeg0cn -oaugh a 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 reactance of a 4.7-mF capacitor at 10 kH i a*xn8p)dbz:z?

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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 reactanc8t bn-*unz jh9e 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 12f; bhjt -g o: nw,7cy3lbvax7200 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 s2m x+ (v5gxfp1s d*zr rzq)q ri89ol4of a 0.010-mF capacitor be 100 Wr fi z r5*v8m g4ld2x9q+qszpsx()1or?

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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-m*8p)gtvh-uxa-+ ngft F capacitor at 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 resistance, 15.0 W i+2xuow.xw -3r e -3hmevxw0kfnductive reactance, and 10.0-x oueh wv2x+e wm0 f.k3w3rx- 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 100-W resistor, 20-mH coil, a;d9xz/wclg d2 nd 1.0-mF capacitor are conndcx dw;/g z9l2ected 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 avy/ e8i ,drhf,t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor /y8,fd ,ehvriare connected 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 series with a 20-mH inductorci-3 z*:rke je, what is the impedance at 1000:ijc3- z erek* 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 ;j8ohtr6ln1 f a 20-mH inductor, what is the phase angle at 168ro njhtl;f 1000 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-mH coil any(2 yi,rith0j d 1.0-mF capacitor for a total impedat2rii 0 ,(yjyhnce 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 7w pq0 a;lqbani6i*o4 resistor and 15-mH coil to get a total im i67b l4w*n 0oaaq;qippedance 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 t h2j3z/c y2hca 450-mH inductor at 5000 Hz for a total impedan2z j cyct3h/h2ce 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 musth51 ue s1 p:gyk5)hayv be put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15)uy51k:ah h1gp y5e vs0 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 con s5/c-io, u.e9atwf uae4i)lsnected in series with a 20-mF capacitor. What is the impedance af ).iio 5c-u4eat l/aus 9wes,t 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 serx/t muqb1+te;26- stvg ztcnm2e ,;eiies with a 10-mF capacitor at 1.0 kHz for a total+i b1e-mvm;2 t2tstg ,ten;6cq uxe/z 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 sro+1ypi*t ngz ww1- /a 10-mF capacitor at 1.0 kHz for a phase as*gww-nzr yi1o1t /p+ngle 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 1.0 .qcv 2 cz4r0r2yw1viukHz for a total 2q.uc2r40i vwzrcyv1 impedance 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 witho 6 t: sw6/(kx-ixuovd a 100-mF capacitor at 120 Hz. What is the phase anuv:o 6x s(o/- kdxt6wigle?

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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 coc yi-g+.b2 keeil, and 1.0-mF capacitor are conneie2b.+kge-cy cted 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 100-W resistor, a 10.0-mF capacitor, and a m ns;c/rml: +swxk3g*cy 7xr1po8g p30.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is x3 rl+:o1*pw73;nmg8 c/ xpgs kc srymthe 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 reactatt9rxsyys.7 / nce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this ci ts.9rtyy/ s7xrcuit?

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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 circuit containh(z2)nf9sr og : h h2sh0f(snxing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when (0os) nrsn2 h h:fgfhxzh (9s2connected 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 500-W resistor for a phase+)u tlvhus0+v angle of uu t )vsl0h+v+$40^{\circ}$ 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 =p2dpl 1v;g;pmlwxy6 ( 200-mH, C = 10.0 mF. At what frequency should the circdl;26;pmw gp1vplx( yuit be driven in order to 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 oute5: 5x)sl ht,nbr5yvxput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuhsny5e ,xb lv5 )5t:xrit 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 circuit6;g8dfj.i g f cz zw(rx;ub/t, 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 b0.hl1 1adejaovvk(h7oa+, s4 ( mdtuand a resistance of 30 W. What is the power fac(a h1dveuv.to,j0b osh1m4 dka+ la7(tor?

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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 resistor, .wm6e7 pjm0 7hyn7kmg4+md ye a 10-mFy hw+mm0m d4p76e7e jmnygk7. capacitor, 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 frequency of a 1.0-mF cm6*p5kwpvm 1ao *tl d 9v)r.dbapacitor and a 15-mH coil in series?odwmvakb 9 ml.r6d * *pv51p)t

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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 foq;ry96hm p c-2sprrl97n ga i8r a resonant frequencyrmprnig l;cpa hq6 y9s97-8r2 of 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 resq:ncz14fpo o;9ahg4 )r q);ayq g lp/tonant frequency of h)zlay;p1q ognr9o p)q; 4/4tqfca g: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 -pt0qh 6m +1fwnrz cw,be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency ofwc,qw p t-0z1nr6h+m f the circuit is to be 1000 Hz?

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