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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 magnetic flux except1)4zgegb.fce + 6tuie 0et) yd

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that t96-sg np2w hk 4bdk-cahe $emf$ 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 oui /zus:zel.7; e wn;xos+x u*f wire in a coil produces what kind of change on the i;xuu we*ss o e+znlu.;7 z/x:induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire prms(,g tp6wh1r q k)a9koduces what kind of cmtrh(6qk,1s9awk p )g hange 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 8yzmt cm de qqeo tabu5o1y:9-(0a) ;eof change on the induceuta ; b5yeoto:9y (q 1cm qa8ez0-)dmed $emf$, 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 f+jba070/zlt k tu6qcsrom a 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 current in a condwml )um4,qch wc(.3up 0wo- 8memm 5wpuctor will be that which tends to pro 4 uewp(03 -)lmqwmu cmm,p58mchww .oduce 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 tablega-pylvwwi s3x-8 68f. A bar magnet is held above its center with its north pole pointing down. The statpgf6 vw s3y-a 8xi-8lwionary 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 lies0s(, o iela.fp flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and rels(ipa. 0feo, leased. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where 9vqskrm.618kqigys +w*d k7 hthe magnetic field vector points straight up. The magnetic field vanishesrk8wsdsq7 kg1k.6qivhmy+ 9* suddenly. When viewed from above, what 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 regr tl+da usi,i4h pj4vya-k:3)-k.o eiion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed le4ij:r4vuoksi - . diyk)p3,h a-at+ 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 a horizontal ti 7(8 7vi;pfmw2(pbf(zinpr j able top in a region where the magnetic field points stjf2((7n(pvbiirw p m;fp87 izraight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table /u n1d-e 8 sgn)acm dbhhy6hb851 hx6gand 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 cur8 yb h81d5gemxau6cshn hgn/d-b)6 1hrent 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 mh1ac xl( j8okem0 nk si2;-man()wc:entering first. As the north pole enters the wire, the induced current will be (as vieans(2o8c;m)nh-e jxa c1 wimk: m0l (kwed 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 32*ng l)hi0ly1j wb) d6je yin9 be1aiconstant angular speed about an axis whose direction can be varied. In a region where 3)9i)yn2ieb ej g*hy01alil dj16bwna 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 rotated at constant angular speed about an axis whos: n 1ldpmv j0a,8 v2*pcn0kds89r dpzte direction can be varied. In a region where a uniform magnetic field points strd81a sjt*n0:m,98dcvd v l0 pp2zknrp aight 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. u698zagfyi d5hpinr.xn7 c;6
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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 z9 u5m,bjvbkpg1, 3i ythat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetma lrsj7/j6yry *wo4qq- 2z3y ic 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) acfrj-;a59jxojpy92z t zl) 6is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential i txjr 6f2 ylaz-;)a9jpzojc5 9nduced 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 angulcri6k)2e9p;0 bhe gfc ar 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 trans2py.us d lfgo0q+/lr 1forms

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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. Tho uhpkw;m2 ;6ao er+7ze frequency of the zom;aw 7k6u pe;h+2o r$emf$ 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 devfr9f1 (w )4xlvtic np:ice 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 p v( n+* mhezwl 4dqum69g6s:ithat

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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 secondar8qizdo xcu)-s .a) a8by coil contains more loops than the primary coil then it is .caq8-xiz) a)uos db8 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 oev4.y;5ao.hui mh 9i than the secondary coilohu9hi .vi emy;4 .oa5 then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpu )bt :m0rhq2mzt

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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 cirk rl, smj0 kj7zoa-ze. 2 66sut+f3lgpcuit,

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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 wx:o4jizwpe, c).8mwtv ctd;ofbenk5 747 5 a in series to an ideal battery of constant terminal voltage. At the moment contact is madeaetd7zt 8:, c j;7ci.ww4pk oo5 )wxm5fvben4 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 sez: d1d8n2bbg (pa x:nbries to an ideal battery of constant terminal vo b81:b(b pd2zgnda xn:ltage. 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 resistance R is connecteeb3/ gi wq/fz1ya h4s*,(iukl d 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 iny r+ptmmqowi/9 4-, pvductance 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 tfue ihrof .u;n9-:t- uime constant for the circuit represents the time required n--.ru:u ufh9 ft; eoifor 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 batterr0uyp yie wu5g(ai1 ,(y is suddenly removed from the circuit. The time constant for of the circuit represents thew e(gyi51(y ruipu0a , 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 h m z6w 3ztb--smv f63in--hszzave the same 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 circuit, the cu;c e 5ftu,9)jq9mn6l u0isxhyrrent

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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 tj0renaq.j ibed+w 5;-u;511vf nqhfmo an AC power supply. In this circuit, the current +0jqd wnf; iebuh. rm1j5;nqf5e-1va

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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 fre0qajg,foni*6 quency is tripjn*ia0,g6 oqfled?

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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 dol3i zyji/it4(p;osf2;i,na7bco 6 pxubled, the inductive reactance of that inductorp 7 s czii tooij 6an;2/x(;bl,f3ip4y

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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, the in8s*dec6zdp4 d ductive reactance 4ds*6pc8dd ezof 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 powee+c5hzdt1zmirwk 7c yn+: j71r supply. In this circuit, the curre7zd c+ej+:57crkhw ym1 tizn1 nt

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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 chan eviel2- 17zbmges by what factor when the frequence2vi-l b17 emzy 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 voltagg nl-njd/wd4x+6o/ mle across a capacitor approaches zero, the capacitive reactance of wldd/ +6j4 nxn/glm-othat 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 inductor a +hr heaun7+ .,kcz2ttivj*; fvv q5j4nd capacitor in a RLC series circuit?e jh i54vqav.c+u+t*jf7k;rthn v z,2

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined da x/d 7 ,t/pf1)a6ccm-bvppras $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R sxm d.vq: 5ikr;.wc-n increases.5k diwn.cvqrm- ;sx :. 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 circ/t v(e;/ enpouy+*jln3/vzet,y l(qguit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases j n8m2hk1r:nt 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 do s t(fxq)-wt*uuble in an LRC series circuit, the resonant frequency ofx-)stqu *tw( f that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC oc 2mk+o ,nlv0applied 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 c/kga- ypr93yyja4 gf3fb9gm+o(. h eo;2jq kiircuit 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 g26b pocu7 n2-pfj(wj)jy9 ap rotating in a uniform magnetic field of 0.20j n jybppgc2jo)2w6u9-7 apf( T. Find the magnetic 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 u*;ei g:w eleg0 9kwa*pniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the log*0e9; :alpgee*k wiw op 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 z.wl.5u y5 wn*bx( b h-lcyl(sis rotating in a uniform magnetic field of 0.20 T. Find tusycl(bwx-n*5. wl5y h (zb.lhe magnetic flux through 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 rm)5svfw6j5o bhkcaruj91/ +n educed 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 coinm,6.haqhb .q e0od8 zn f:p(ol 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 squarer h67i-3,,uzenlx prg frame with sides 18 cm. A uniform magnetic field is applied unprl,g zi hr,-xe73 6perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and ahijfc1a 3fg, 5n 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 an n+nit3m)yg;c7w- do bd 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 tja;x3nah ehl*u-+ i2 location where the downward component of the Earth's magnetic field is ;2xnl h*i+ et a3-aujh$6.0 \times 10^{-5} \; T$. 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 rotat w)dmom0s9uep(78zah +t /moxiq97ta es at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant+ 9ohm7e/mtduwmo 9xqa zi)p a s(t078 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 cndr xqh4lm k/u3u *cvv23ac+6xf p71 eross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of d1 5n2gtpjx195xxb cuarea $0.090 \; m^{2}$ 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 8 0 /jp3n,cnnpb0 rectangular loops on 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 magnetin/0p3pbcn,j n c field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 10sd.8.q0wrul2yow0 tj 3 je2nm 0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simplv e82.9 slobxre AC generator with an output of 12 V maximum when rotated at eo9b8l2xr.v s60 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 generat(kuqmm+ca82vb9 pv m2or with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor op hghzb:s2*zwr5tyh1knj1m-+63 hbss erates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on 4 yz vwnpg1qtg6y:-i)jn 1q4f120 V AC,4znyqjfwt)6 1 n4:y1g ipv -gq and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-Vriwr jgw ) qv/ +afg6r04z-vp+ power supply. The operating current is 1.0 A. What is the spg- rjwrva/wqf i+0 4+ rz)vg6tart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. *b6):dn uggkqosn9 .d The operating current is 1.0 A at ndu.:gsg *qdko)n b96full 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 connectedwdb4m3k be0 r;3; *1* ctrwe1xcvocvx to a 24-V power supply. The operating cux3w4v1mk b bdor;c0 3 vw*c xr*et;1ecrrent 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 glm0uulu/ ,hpj.s3k oh1)b p+needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A tox3vsojn)jz+ p+u0h:4w:,spq a z cl-)yv y;cq flow in the secondary. How m vw+u-oa y:s4zxp;qpyjl+ sj) q)czhn,vc:0 3any 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 necessarm0uiy9 wq 0g3jy in a 110-V primary if the 24-V secondary has 100 t3j9ig00ymq wu urns?

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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 c26xau l(ou vw0kvamom/e7yj-:y,g k9 oil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the-yo 9w,m l(v6uy/v7auakej :k0o2x gm 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 aoas(i4j4 1gbkf;doc1 w l. 0 c0gne;xa transformer. Assuming 100% efficiency, how many amps a g0aa bwcdc1 s0ko1i 4;en(;ol4xgjf.t 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Tzp;i 9m 29z99hfq pal2ev 3mmnhe primary coil operates on 120 V. What doeshp9n2fe3m9 9;l2a z9m q ivzpm 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 9nj3v*a; /dpzp0;,mgaq yk))bcoqatturns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what v p,; v; knzgayb)/otqa*pa3 mqjc09)doltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has0,8i k4 oltd*(to3 5mypg aelz 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V3m5dt at,*geoy 0ok4zl8pi l( at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer nar35 0.jl xxrhas 100 turns and its secondary has 200 turns. If thr5 .rxl anj03xe input current 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 2158makd w o w10sajy6ak ,ynfturns. If the input voltage to the prm 8aad ,ok2ay ny506k1wswfj1 imary 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 20n po*7f4ib2dn 0 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary tof2 4indb7 o*np 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. To09 ism0dxrp or 2ow30a 6d3nahe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find a2 o owdxa30p0sro0nr36d9mi 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 stepped k4s i(i .s8a7lz k0m5hj9 qhp:hzph 5pup 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 transmiss7 50hhh(pqkhp8sm9lp j:.z ik5za4si ion 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 120u b7q7v x/i*pm. 2bi7ffrr5dg4so :of 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 4gqso if.o 7ubx 7fbrd/f7mpiv*2:5rstepped 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 losa yk8+4x pb/e5.vipdqpf9,v s p1z)u ng 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 would be lost if the trk ude)z,s a bp1 5pvqv4ps9/i x8+p.fyansformer 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 k de:vhh q8:ojn.wdh/ q5xay.s 7wv/t 9m long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss duej.n/d8hqwa95h owqdt:h.v/y x:7es v to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 10nq 9 8l7l(cr q3qkb yt/(,actt00 V. How much less power would be lost if the power were transmitted at 3000 V instead , /ql qc((tytnak3ql9b trc78of 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 wrbfk fh o7lfd nwx)-ye,73 g .v3 3xe*iq8:rq440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output *:deg 3hno7.irw-3 r,eb ) v xffkqq8fwl7y3xbe stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 58+ znp5 ljjncc5x 9cc4.0 A. How much energy is stored in the coil's magnetic fiel4 jz+plc5cxj 8 5ncn9cd?

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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 inductou940x i 5lgb4b.lx jsmr. What is thisxl4 .u msg0bj4 lx5b9i circuit'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 an36s98jz zwp3i bgpu6 n 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 placwo( /af,8m nz3vcbp1ned into a 120-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 a 120-V AC outlet. Whats1*y0 mnjs 2lchs12r4 xxxlh7 is the resistance of the lamp?0n xjxlhs 412rm s71s chx*y2l

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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(ta-tm(uy*m h supply. What is the peak current through(tma- umt( yh* 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 ac power supply. Wh7yv0/fki 066r doybj-8vg g j hnaq59sat is the power dissipated inhjo irg-d/k6v0nysyq gv 98 5fjb076a 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 resisto;5 obfic1rs7pr is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W ,8dx gi8k, qm nf4-yvoresistor 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 isbs*o(skb/xkw7r/ naw/6pvx : $I = 0.80 \sin (240 t)$. 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 gow pew 6b/:d./1kodta 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mHvzge:2o z ( .1fo4uoei 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/wx.8;/k u z fof1c6/ nh:rfuuwau0;i cd:nltH 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 ; lz*/ uro+mvr ziuh 52f2n1eminductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequenc* x0l5,g oyooiy of 20 kHz is applied tg oioy,l05*o xo 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 ,m0oqmz4q 4chux y+ xw7t+h1fthrough 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 (v7akzo tddix52 oj5: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 of g9;yc9v -bht j 4dq+dvcapacitive 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 react rha fd/x,zji:fc m lq;4;;2qdance 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 af*iknhf1- va w) r;,qk 0.010-mF capacitor be 100 W?1a;kw - k* iffvqhr,)n

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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-mFsb, msnw/;q+ofs amu +b:)m 2g 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 ciobxrc x2ft) g;6m; tiqyx53t. rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W.x2 b)6t3fxr qtomx t; gc5y;i 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 impeho v8c/jg bnw66 (lht3dance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor/v wgh8 cl6bo(3 nj6th are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase an mba-/s,i4kso bfw6) hgle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ara s6, /m-khwoifbb) 4se 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,-hrxw/3e3 vtw jvmcyj- tv;27( t7ssx what is the impedance at 1000 wshtw;3m2 t7jvv- c-3r /st7ex vy j(xHz?

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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 withef6ef,nh 7.dj a 20-mH inductor, what is the phase angle at 1000 . ef, hdnj76efHz?

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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 ciku8.5e v/ftgvf d kp-c*.tdz5 rcuit with a 20-mH coil and 1.0-mF capacitor for a total impedancekfg-u *5 t.zkdfv5t d.8vecp/ 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 nmb 2jwv::h8ls eeded in series with a 100-W resistor and 15-m:mvw8 jls b2:hH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in-chcua 7c vt*. v1o0do series with a 450-mH inductor at 5000 Hz for a total impedance.cdv -v70u*th 1o ccao 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 serie5 of.ae+ d4mx1giv8so s with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kWo+i4gs1vodf8e5 m a x.?

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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 conm j(om.:e0i lbu:ml mlefiz945w v (v1nected in series with a 20-mF capacitor. What is the impedance at 1000 ef104mm b lel(mm uiij5l9.z (:o:v wvHz?

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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 capac;vgyk8 novfg/la, z203afksh tm y(*)itor at 1.0 kHz for a total impedance of 4*g(a ;ghkmvy oy0l /2v t,af )3fz8snk5 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 kHz fg85 5ydq kdy9og+my -oor a phase anoq d5-8 gg m+kyy9yo5dgle 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 1.0cmrd:im g .4 slb)6op1 kHz for a total impedmp dg.cr :4i1s)b6 omlance 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 inm0q-e vok twpfaaal-u2vc0r2 )+ *n :o series with a 100-mF capacitor at 120 Hz. What is the pha a fq 2vae20o vkc0l-wm)tp+-*ao un:rse 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 co0 ;p.f ttxrxj fu20377nhapmt il, and 1.0-mf0 txp3u hmr;xntj207taf7 p.F capacitor are connected 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 1w9epk u:p +fzy*6r zzwe(d4i 20.0-mF capacitor, and a 0.350-H inductor. The circuit isfdzw4eiuer(z pk:62py *w+ 9z 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 capacitmjv+m) )qn8cowtd -3lor of capacitive reactance 30 W, and an inductor of -ml)o38+ wvd )m jtcnqinductive 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 --zuf(f+ b1iw8 ud lfyt (s .5kxdxk)ufor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powkl i .5-(+1xxku8 - ff bddswuftuyz()er 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 fi 9ry*x l.p89-tr0r3th u vkxseries with a 500-W resistor for a phase angle of x 9it.khv*389fuyrp -0xl rt r$40^{\circ}$ 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, Cnsaqa3x ty:t:b;5-ua. ju 6hn = 10.0 mF. At what frequency s;ah.t:naya 3n5x: q-jsu tub6hould the circuit 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 output in an ac series crk4 rfs 59t 2xs mi(p1 dk/yfr3xfy,o2ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectedsyp5 dy 3(9rrk2txs 1ik or4x,ff2/mf 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 ar zoaki,:*8tu n AC 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 resistance of 30 W. Whbunn9;zr 64lpn5 hi3 zat is the power fa n96 liur3z5nn4zbp;hctor?

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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 resu+vec uvpg.,z q )8cx/istor, a 10-mF capacitor, and a 0..xce c,uqug /+8vvp )z45-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-m ldhbzd*-o 1l:hha5 i3 )k/ttrF capacitor and a 15-mH coil in series?l):h/t1itzohk d3ahdl-b5r *

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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 az7kd- (r f ep( jmh,:un3 .)vlxrvlz8t 4.7-mF capacitor for a resonant frequejfl(,7zh nd3v-vermxlk( :.)tpz8ur ncy 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-m);eg52/2syi q t qg(nb uufc v2(zh-cfH inductor for a resonant frequency of 1000 Hz?2n2)-fuz thqefi(cbqyc/u v; gs (g25

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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 avh/s hhtno9pz( 4;7la 30-W resistor and a 40-mH coil if the resonant frequency of the na/9ztls 4;h(7hv op hcircuit is to be 1000 Hz?

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