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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 uniwxid:v2 tjdr6)bp(x5 ts 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 t 6rbpmh4o)zskmaj2x 98 km61phat 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(*3o6:hbo8f -gg yg1tpcf hpi in a coil produces what kind of change on the ind8p ti:f(hp ygb h*o6fo -1cg3guced $emf$, 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 fi e9mo*3tdjauev;9b* ri38x9*wkqx: jz uvz6qeld through a loop of wire produces what kind of change on k;* 8eeuqzj 3v*9 3b6at9vjw *qxxd9 ui:mzorthe 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 producesnnx)*j*uc4e w(hva z) what kind of change on the induce (n4jvxeau*n) hc)*wz d $emf$, 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 af b xtzz3jx8k;/;cdy p khx+(; magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced currell7 1* )yj5;tndxkq3o b6g ns+r ax*ufnt in a conductor will be that wj3qs n* 5g76 fx;nk+l*1)ybdtoaru lxhich tends to produce 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 lies flat on a horizontal t65l6 dx7sr+lke wvuyywn-3n *able. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vieweyvx*- 6 dr3eluskwn ln +7y65wd 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 bar maf a36bvbskv,d.yv2,g, 6d ecp/p 4slu gnet is held above its center with its north pole pointing dowk.,lgu6av,v2 e3 pfvc/dbs b6s y4p,dn, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on ldd:ic yl09 1ua table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current inl90dycl 1d:u i 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 vectoeqarj7: j4 4awr points straight up. ejjr4q: wa a47 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 sbs,unl .q(qyq4e7lrrd25w j gs ng)15dp.+ja horizontal table top in a region where the magnetic field points straight down. The magnetic field d+us5.gqjg.7ersq )y,r 1nd(nwl lp sd 2b4qj5isappears 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-increasi xmd.fj7 q*tz3ng current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abodfz 7tm.q*j3 xve, 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 lozn8)l4w .hks nop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as vi4n . hwksl8zn)ewed 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 anx (tk)fs38osagular speed about an axis whose directiona3s)ft(x8 os k 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 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 ro r iya(8lfac);o c8f(m)mne vyzp-j5)tated at constant angular speed about an axis whose direction can be varied. re lj mi(ca8fn)o; 5vzcf-y 8))aypm (In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.ij dr-kl-k cnfuym /m.c8i68kjp 7 /+q
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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 qg 8 t- lx-l7lu ie53hk1h3tdban $emf$ 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 magn)l+o/lgp.n n 8sd: 3 7rddafcnetic 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 moved northward at cd v hl -ap/s3sqp3/cl+onstant velocity through a magnetic fielpa- c s3/ldvqs/hp+3ld that 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 rota7:itk fw:j db:tes 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 generaton .ufu; *.jdk)s d--qoat5si pnq19tw r 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 revolutions5m oh7ug)5-., cf5ipp g::vpkbo bukt each second. The frequency of the c5- 5utpu,:bgk.kvo:ogb5)mfiphp 7 $emf$ 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 used p q9dm)td3i:8 ibjrs;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 tha*bqhu526 ;sryesg 6kkt

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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 8y,qwq3tn8 y jat,y7 pfq3 p;acoil contains more loops than the primary coil then it ian3wq 8aft 7y,,yypq;p8j 3tqs 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 z gyr2 i tdu32*hfadwnu/w+::secondary coil tn2w 3wa*+ df:rih uztuy:/g 2dhen 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 pong*, ;nw 8. *fhrfnykawer 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 circui fe4 4rgfy; rih2zl1 vi6sjd2:t,

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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 arzr()g)pvuvg4 e connected in series to an ideal battery of constant terminal voltage. At thz4)gv pgvr (u)e 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 y(n9gyfmmsk ic.vd 1c;7q.dfb,2 l 1 eare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducf ;s.qvi (l7 mb.9yfcnd ckymeg121d,tor 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 resistance R is consycnog,(.z5 w3d9 k 4 jf-anmdnected 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 inductancemkp36 ;ehh ,ne L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time const3n3c4 4 nis6d*nqkkhmant for the circuit represents th3h4ncm 6*n ind4sk3k qe 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 arei c 6+:p2ootov connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for thet :c2voip+o6o 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 sanvg/np si0 sk2ba)5 uv+lj0i*me 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 power supply. On this circuitb9h8vrts 1a4.k gzs-y , 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 connect8+w rm+65gh8fs0 md9jrri ) gly7nqxted to an AC power supply. In this circuit, the curren+7n8w rmh8) rqi6 srjxt 09+y5dlg fmgt

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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 g ud, h sjut+00gsu.q f4pr)-tfactor when the frequency is tripleg4jsdpg0u)ur.shfq-0+utt , d?

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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 acy:mg8nc0lz 9dpnb ; t9ross an inductor is doubled, the inductive reactance of n tzm8gnpd;y :9lcb90 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 agq,h6v:jeww(l s :z,(c,dnvr cross an inductor approaches zero, the induc h6gw,j (e(ns v,r:q,wv:zcdl tive reactance 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 supply. In this igy92e nqy :d3cj3b 8z/dpg8ui( a(v7x u jx8ocircuit, the current iu3pzxd9j78 gy 8n((v yxa/deu ciqj2og:b3 8

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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 whrrctpuw 0w318 f+v (/ czhac6lat factor when the frequency is trrcr/c vw0t (fwlaz c +p16uh38ipled?

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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 an6)v (utfzodu-+f*t3nse:xzcf*+vl u8z ,bzcross a capacitor approaches zero, the capaci(bxusl+v o* fz ,8 -)f tcv*n6:z3efzt+uzduntive reactance 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 i.vnjt)wk2 6 j-lxb v0dnductor and capacitor in a RLC sevkbl-wvjx20) nd.tj6 ries 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 -(: l1g/ yh.jdtg mpggRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. T*vsihpw+ gt 34jx t4;myb6/pgwcidzlp1g4 2 6he impedance of the circuit increases if R increases. When is yg/6d2 zg6gplcv*wp4 i41 3ti ms+b4wjpth;x 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 in ,o9y1os pzv*qcreases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. T,f l,*qd *t 0z4.v qc tdw+t7q0su5alb.c yhkehe 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 ( i/n vz7yukg9o0u 4nvthe capacitance both double in an LRC series circuit, the resonant frequency of that circuit n0g4/9yuvvo 7i knu( zwill

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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 lzjeldv+k- 5nfiw:+) p9 xd*l an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cir agv0 5lx/itgi5n.s.acuit 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 innpi8l: 8pkwb:a 7 /a/xkepmm/ a uniform magnetic field of 0.20 T. Find the magnetic/e7::kl n ipxa pm/m8kwa/bp 8 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 uniforqvn dyayv.y paw5,7 ()m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ya vwyq)yvd(, n7p.a5of 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 rot8+:q(yfw c ses w.yy8n,kxg9mating in a uniform magnetic field of 0.20 T. Find the magnetic flux th( wx wm+8nk:ef,g9yq 8y.ysc srough 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 single loop is reducedsgnuyju : k5ra 1.t1-k fa,p9m 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 6 vf;:ceh22ieda9udk 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 wif x7 nc*95pgbhth 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the chb5 p9*cnxgf7oil. 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 aw:a11,oa y9yoq.pdx lm+ j3xqn 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 a y:6+j a59c2bajp pthi9;ulpfrea $0.20 \; m^{2}$ 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 6 ar mctk:4l0mxwcg*.at a location where the downward component of lc.4a0*ckgt mm r :6xwthe 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 bar that is 2.0 m long rotates at a constant angular velocitc-(kc rjj 4kp-y of 2.0 rad/s about a vertical axis through one of its ends while in a consk rc4 ck-(pjj-tant 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 hasb lbhgwy3ou7il8/ 10 i 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ie3o aby ex,,9e,sk6 t9gby +wof 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 loop is 12 c/z;qa+x) a ;iouh/5 a1f sjzprm 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 ;;qjh1sazuai//xzop +f )5rathe 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 consistc//3+ysaq .j z6yqkp os of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to constl: o+2vy i*t6bzfo pijme r57of3, -ulruct a simple AC generator with an output of 12 V max:i+pt -m lei,zy bjourvoo25*7lf 3f6 imum when rotated at 60 Hz. A magnetic field of 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 generator with a maximut5a 2ol6v *f)zi20. kcmc rfdpm $emf$ 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. T(6 i:p t.inlcohe 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 /v6vqu vic y;y*u mwe d+6:f5zof 6.00 W. The motor operates on 120 V AC, and when running at full speed it gen*v+ mi6vy:65w y dv e;z/uqfcuerates 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 internale2j+7(yq6ob r)6*llgb ykh uk resistance 6.0 W is connected to a 24-V power supply. The oe)kb kb26ly6j*7q yo uhgr+(lperating 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 internal resist5e:n u kg75susance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. g:5 75sunueks 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 cosr s j*dnxomp:plm. (03cvy9v6 .x8dnnnected to a 24-V power supply. The opery. l8 orc9(mxpn63n:*s mx0vdp j.dsvating 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 abz hc 2.,rof/q 7y3zif 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 transforme,5 tpy3e c7nbx0 )z/3xywcqisn 0d v3yr causes 14 A to flow in the secondary. How many turns are in the secondary?)e yi0y 3q xx5tnbd7p, 3v/3czywn0cs

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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 primar alxmx64;r zl 4q8uiy.y if the 24-V se4 qzx6u 4yi r;a.l8xlmcondary 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 pr zp to/9i 2zi:c2); zjag:xmoaq)4ta cimary coil and a 2000-turn secondary coil. If the current in the xj)c 2qa4z tz;/2iozoa9a gm) ip::tcsecondary 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 o:u rr;m*siu2 imy :s-js lg21ef a transformer. Assuming 100% efficiency, how many amps at 24:srss12rly i; gmui :um 2-e*j 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 10gr cr5x/ szv572f:y /uerpmw ).0 mA. The primary coil operates on 1ew 7:fscxv5r)r yrp 5m//uz2g20 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 prim hf n(06wu i;o3ettyd( ao))yfary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is )on0y6e )fw 3u;iyafdh( tot (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 tuz( r0m 9,qztm26xsaaf rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?tmq z x6a(zr9m2 ,sa0f

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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 1 ym+gcuj28 cd.f; vny200 turns and its secondary has 200 turns. If the input current .jmcgc dn22 +;8vyu fyat 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 200gw -0lx1u.u(teki7o t turns. If the input voltage to the primary is 100 V, we can expect the eu1.70ltx -kwtugi(ooutput 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 secondars* l ( 6wy.-r8vyolhx (yw(eply has 200 turns. If the power input to the primary is * rohl(lxe(l ypvwy.w6s 8(-y 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vcvq , ;zdt j/(yba;u/joltage is 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 secondary if the prij(; /cya ,/tv;qj udzbmary 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 currenyn9zq :a6crm.z zhq-6/tfut 3 x)mio)t at 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 percentaxyciu thozn-q) tr:6z3.q ma69zf) m /ge 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 voltage is usually stepped c yf,e),ch2d d*glpp /up to 4500 V by a transformer and tr)dp dy/peh* ,2f,c cglansmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totan1.f2/ uswp(d xtp ;lil resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmis1/ u;p nw(tl .fi2sdxpsion 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 xirw1f * 3*munhas 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 of1x3m*i*nwu r f 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 zge,- 909gwgnjx jpd, V. How much less power would be lost if the power were transmitted at 3000 V instead wg ,e9z,gpdn-9j jg0xof 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 transmitte4)kl. 6 j4ct -8q; hpde0q3ecfveb perd 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 eqqp40 e ej;c pk.43c er)8tb-d lhv6ftransmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ener8g8)ebul: d nzgy is stored in the coil'sb ng88l) d:ezu 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 induc+ed )hosc /7 sun)skx-hrd2z4tor. What is this circuis -e+s k hh)d2u7)d4o/sn zcrxt's time 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 voltage in an AC circuit where the.wfv l /:zwa,wq 9hwg5 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 ikl2 r c. hgz(r7; aa;b**ct hm;d0fqn:gzec(-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a3rehg4ekm 3y . 120-V AC outlet. What is the resistance of the lamp?3hgrm3 ek .ey4

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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. Wgdn 2wbu2t(cwl)xakl u.,b 66hat is the peak currentn xdc )btw6w62 .gb2,a(luulk through 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 120-V a.8q; dto djp/p vq0f5jc power supply. What is the power dissipated in th /qv.qd50df;jotj p 8pe 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 o ym8uxv 1/(1okpab 0r50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through jv8vt-wt j/.e a 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-W resistor ispqg fb*4/s/ p6)m (5wpylwg yxt /f/lz $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductod ;qopbv1* dvzzy: 3t)r 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 coig2 k,i6h)fltp l 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 fphh 6.b9.frdbf 0w2la 14.0-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 meclqw17 a+ 30* urv2 1akbbuqof 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 inducwr.sb/zo1 cf/;oava 41ci5xmtor when 120 V AC at a frequency of 20 kHz is appla1 ;or/f o/4c5a .b iwcmsv1zxied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 6euyyu:xut: lf,e 3/a+0.0 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 capacitii -kjk)qbn,3(h 2j ,6 vby4dvmtyk6t cve reactance 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 s 0vi*gp2*idm50 W of 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 doe*9g tfcwju 1j.s a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.01o1v ) n*:ihtqa)cl3ev0-mF capacitor be 100 W? n 3h*atlc:)qv1 oe)vi

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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 capacq lzoi)7dsdv lq*a*; ,itor 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 cirf m9z t)dpcg/)cuit with 12.0 W resistance, 15.0 W inductive cz tf9gp/m) )dreactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 mqrk :b;)mso2ok9ok/- p+h. k r1eaxxHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c +kx o-rh akp bsm9eo.q1r o)/2k;:mxkonnected 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 if a 100-W resisto-oe -jmzn- g3 :mivr6gr, 20-mH coil, and 1.0-mF capaci 6m 3g-jze:vnmrg-o -itor are 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 inductor, what i x+zy9/ cmfc6kxb(kn-s the impedance at 100f /cb(6 yzxc-+ kkmnx90 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 cgspz /;,)pod q7 l3xea 20-mH inductor, what is the phase angle at 1/;l7 gsd)coepx3z ,pq 000 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 cjn,0s7 bo3jlcoil and 1.0-mF capacitor for a total impedance of 1jj 7s3n0,o blc00 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 iu0t j+ye.9 mkm/1vmwmn series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 20u+v0mwt1em. m ymjk/900 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 yh7mtsa*;f*- j f5 lq8gx 2z-qje(ukxseries with a 450-mH inductor at 5000 Hz for a total impedance of 400 ffgh**uk y2 zl- j(;asxe8m qj-x75tq00 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 1.0a 28:x k7p;7bpqdx-9 **dotytt rggbv-MHz for a total impedanvo- :p7py9gbxq8r 7bd;t axtd kt*g2 *ce 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 capacik/1-f -( vaxoazxmzo/ p. svg9tor. What is the impedanca- px/f1z9k o.m/x(v z ov-sgae 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 a 10-mF capacitor at 1.0 k tp8(bl r/ jbz,q)rxf4sahtz1 f7+if; Hz for a total impedancztxift /qb( f7z4pbh1;+s fr8r a),lje 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-mF capacitor at 1.0 k6mm d;wwx)9cr1n-aox2 .blu d Hz for a phase angle of -ab6 wwxm). u 219do;dlmxc rn$40^{\circ}$?

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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 al,2b(e zvw8opbt2dd 9:q be 4f 30-W resistor at 1.0 kHz for a total i(o84 lbbe2fv,wd9 dtbzqpe:2mpedance 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 120 Hz3wt:j rb11 ffhnt /d9k. What is the phasebj d/kft13w9th n f:1r angle?

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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 1.0+kjuiry1z yk:r6wc*y * ugq+d70hz 3z-mF capacitor are connected in series h gi+cwjud1yy 6r3z*z:y z7r*u0+qk k?

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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 1072-vkj x40 siy ,hbapg0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rmspv-,a 7y2kjh4bxs0ig 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 cap3r6 t.s(itn+ahbt h3 bw.2dzeacitor of capacitive reactance 30 W, and an inductor of induwtah bt6.z.nie thd 32br(s3+ ctive 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 for a series RLC circuit containing a 50-W resistor, / ol4n kv,gav3a 10-mF capacitor, and a 0.45-H inductor, when connected to a o 43a gv,lk/nv60-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 necessax om6z 7n2*bc:leau 5kxsx,n3 ry in series with a 500-W resistor for a phase angle of bn,nxzoxx 62*u7ma:3cls ek 5$40^{\circ}$ 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 hasl +zigxw r/r.)yztnj()fl02 c R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from thn .+0lri w )tgfcy/zz2 r)(ljxe driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resista 8inac04twb3evi+ jf* nce, 15.0 W inductive reactance, a in3wav80jf*tb4ce i+ nd 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 Acw a;9 v;n30rbdrr bkoyc;;v;C circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a r+ b a9y8lwwq*/noe m9/sz(u jfesistance of 30 W. What is the powb/8*wjf ya quoenz(m/sl9+9w er 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 seriy/lkd6/mn(pvqa nm/r1vb v+d8(( hkohg4y1e es RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducto /dnl 1pehvqmo dybrk vvm1kg(6+(/8a4/(h nyr, 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 capacitor and a 15-mHn)mc+5)k ezc uj l:x)e coil in series?exlj+ kn))5c:ucemz)

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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 resonv8j i0 p7x fbrk1 ir1-swew;x/ant freque1w /7w8pixrev ;xbf js-1r0kincy 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 dz ah7:,bjc 3cin series with a 3.7-mH inductor for a resonant frequency cjz,:ahd7 3 cbof 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 i+30on b7g y83,g8q0mg -nbqbw hzwvl30-W resistor and a 40-mH coil if the resonant frequency of q nh3g-wbo ,v8zwl8bngy+b03imqg07 the circuit is to be 1000 Hz?

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