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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 exc*oq vd57rm+s jept

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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 thmn m gacvo+r8pqz ;-5me;) z2pat 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 dg: dzng 6o47schange on the induced:zs4o 6n7dg gd $emf$, 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 produces wym 9h acv22c*rhat kind of change on the inducecrc *2h m2yva9d $emf$, 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 of chang1,dmzb+cpw. xl 3oyet d4) hv gtf-e38e on the induced,3l vmtyw3hbfzd.ote c1e-) +p84gxd $emf$, 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 yzvc 1:0qff. n; w/m9sx;xt5epsma,u 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 dzq 200azt xy1jirection of an induced current in a conductor will be that which tends to produce which o0t02axz1 zqj yf 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 e q+z)d: l0ox) mp5z;z-c sxbna horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet+ -z)xz)n:d ozxlceqmsp;05 b 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 ha 0yw/y0mt4 n 11vndkcdd,ez3orizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaca1cwd/ k01d ,ez nm0yyd34vnthes 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 7ml :g(vw-lsnn g lxp6vafcaj8;+3 )d in a region where the magnetic field vector points straight up. The magnetic fiel+w7al )l:dx glcags 3( v;mjnpf86vn- d vanishes 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 ta6 0h/6l 6jr thqk9+tfkc8 leykble top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in t80rf k/9lhcq+e66jkk lyh6 tthis coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region whqq / ymsk+*aookke:g/ c+ijgt2zh 1*.ere the magnetic field points straight down. The magnetic field disappears suddenly. When viewed froj+g*k+/zqo2*gq ah t1o/e ikc:kms y.m 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 di9dkv;z: cu4takc: 2 a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on 94z2 u;kaci tkdv :cd:the table, one on either side of the 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 wir:*xvkdx.w,2 op 1qdcne with the north pole entering first. As the northoc:dv2* q, pxkxw n.1d pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant anguku4 ,ss9. ;eckduc 5eylar speed about an axis whose direction can be varied. In a region where a uniform magneti49k,kucsu;yds e.5 ce c 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 a1fw6w nc7(1a hsfr2mpr oid d1a27-fe bout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the daa1cwfi(r1rf -s hdm 77p2new of6 21orientation 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.c jmhx*1x3p llo0ge0sn2/ -tm
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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 thasxia c535p7rej 2qgr; ,uqjk1t 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 magnetiqgy8go1; e6tts 0l2l tui9lq (c 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 northzs pc/ b3.s.gtward at constant velocity through a magnetic field that points straight down. Make a b.3ssc./ zp tgstatement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant ang 1 jleoo(sz.2bular 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 trxy9+9 8my:qv ;p;yq fus;mjzpansforms

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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 hg3hol,bib+t l3p07 c second. The frequency of tigb3h0 lt3ol,h c+7p bhe $emf$ 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 ddy9biyze k a)k7q9z ck.i8,- yevice 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 thattd-a57sl56f lw tm w8q

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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 loou. n5b 2bs gi7wbv- q;f:jciu8ps than the primary coil tig-vsbj5bi; .28c7u: n ufwb qhen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondnew6jg1 edb+3/ km w:oary coil then wedjw+km e1g6b:n 3 o/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 inputjc ruf9 a:b7y7

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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 r4npc5n* hj)wr;xq5m v4 r-imcircuit,

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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 inducto*aoq; td*x vddsc.3 ;jr are connected in series to an ideal battery of constant terminal voltage. At the moment contact is mad so.cq ddvjx; t;*da3*e 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 seriesn+s.xq6 y)js:x k,aj*xf* k aw to an ideal battery of constant terminal voltage. At the 6kfw*y *s: kja)+s xx,qj nxa.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 0xni8 yus/. p1lydad2 connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connec v)*dd*i)nmi wjxsx55e w,i,fted 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 inducto:h 8kfagbj)) 2h oufc1r are connected in series to a battery. The time constant for the circuit represents the time required for the current to rea hfhb :2cfu)8g)j ako1ch

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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 induct/e-*hdrj 3w abf8no v)or are connected in series to a battery. The battery is sba*j dv3en8/rof-h )wuddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the s.2.+i9bb84bvozk el9vpalc x ame 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, thgn w 16xnpqfph j)9y;qn90*r je current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to anulc e sa2xoy9d1:.pfc d 8qn9.m86vro AC power supply. In this circuit, the currenx.88 yafnomq9l21:6 du9c ceosv.drpt

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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 fol84a, nnb .v,see6 yl8ekt(qm fy5n 2actor when the frequency is tr(5 oekl4 8ne.6 8nms, naylybfqv,e2 tipled?

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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 induczin wy y7h ihxtp5l27,id f6j.u).e:ztor is doubled, the inductive reactance of that f.z5pitij:hliey yzw x.27 ) dn7u,6hinductor

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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 voltagepjeuhkb-i7y x77nj3/ 2j8 8zn, ucoic across an inductor approaches zero, the induct-ji8/jh 778nucyk7u izocxn,j e2 3bpive 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 a04mpl5d1;bfj i 3ksipn AC power supply. In this circuit, the currenpl3bpi d;0f ms5i4k1 jt

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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 the fry:x4// +g);s bdoe hqv5m, vsf 0qwusmequency is tripled?: o4sfw) gd ;smsmq,v+/uhx5qev/ 0yb

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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 m ,+ ux8do9i+ j4ejsqet* dskgp2z39facross a capacitor approaches zero, the capacitivof 92d,d*sz+pj+qeit8uk3eg4j sm 9xe 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 inductor and capacitor wz1q vs8e8as gepr2ba ( fyp4v9)/a9min a RLC szv(y 9)8eas 912pab 8 vs/qewfgp mra4eries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is definesi .)-fj;; fti ih:oyyru,j,od as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance fu4 rf,-f nu5mfsmk1fe)vj gp/4ui 75of the circuit increases if R increases. When i fffp)knmuu jg7 is41fr- m55fue,4/vs 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 circua /acuihvdz 1q/js5;1it 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 circxsx12xcyn2 +7 mllxn,uit 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 vi:niwg 40/sj the capacitance both double in an LRC series circuit, the resonant freque4ivjs : gn/0iwncy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that i3zesxx)d p: zv o2;a-fs5yv3l s 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 series RLC circuit occurs w6rguo6 i j(pr:hen

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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 0q3 9 xgcv0 cm3;lyk5vc.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loogyl c k;39c0x35mv qvcp 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 ;9ccglm1jz -vsg ,c9x.10 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 fielc9zl1gvx,mj9c; sc g-d 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 field of 0.20vfd or5-vn/o; ethhyxo ,;d.* T. Find the magnetic flux through the loop when the plane n/do y;ht5f v. voo-*,hxrd ;eof 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 )z w0ad. vaudki7 2kp*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 coil ub 3 tnmkk*30tk2 d5.9asejxpchanges 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 e::c kby4pfc ,8(ok(a6ub ekf r2/msq of wire on a square frame with sides 18 cm. A uniform magnetic fielfkapcuk e4ey:k 6b sr/ ,( bfq:om(c28d 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 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 wit.+vcxiu xz;.d h 15 turns and 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 ar/*sjg-fe0 4yjoi1 d 5si7h u3jft.jikea $0.20 \; m^{2}$ 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 a4 oezq;w/ b bw2i0i7p.ptoh: at a location where the 0 4z eoipw h/b.itoa:7qw2;b pdownward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant 6 vtw2*csbfzaij:. 1v angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant m6 cf1.vwjsziv *bta:2agnetic 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-sec rh3oxqexx1, 0tional 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 wi8-(u w9ppvg mrq: z w+aejll:0re 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 wkm a 1o2r0 c+klx:hhqv bnv(7c4:fyum+ 1wn4rectangular 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 magnetic field of 0.30 T, which is perpendicular to the axis of rotatiuac bwoklm:v rx1 y1n4 f+m :cw2+qh40vnk(7hon, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire*:xawk ;1uexe 2r6zuok,q+p n 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 simple AC geixp kkbpkh 2z frh0p0q+u1 t00 :djw)1nerator with an output of 12 V maximum when rotated at 60 1z0k hqp 2+w) tk00ihpjbdkf x0p1ur: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 maxi1 ktv(*u 9ytl ( +- nr60csivcyt*m ,zr-cjiphmum $emf$ 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 ro4m4,hif 2ty+b r;dt 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. The motor ope1r4)w(nmui rg2 s :zefr/u uv9rates on 120 V AC, and when running at n/z1 fvu: m(429ru s)riewugr 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-Vf rdebg nrv ln00-c,74 power supply. The open-0g cr ,rv 704lndfberating 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 resistance 6.0 W is connected to(kw tu0 -)oy: exkjh7f a 24-V power supply. The operating current is)k70ky-oj(u :whxte f 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 to a 24-V power supply. 8eqf +8./ifnlw :x))p zm hezl The operatingl+)hfz zi/fme8n x8pwq :e).l current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pr8iks ptyw3; )lasi+ 7simary 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 ofb 7 )msp ;aivbl ,s-ahj;b6-aw a transformer causes 14 A to flow in the secondary. How many tu6;lhp7-mbw v i;a), saaj -bsbrns 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, howzsc99ss i24 g v1 cmlo5p2fu19u6yqb f many turns are necessary in a 110-V primary if the 24-V secondary has 100 turnv9sc21ucqzs1y2 m4s uo 99 gpb5f6ilfs?

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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-turn secondary y9a9/ wzne+mgxm ded0udm( 07j )ab0ecoil. If the current in the secondary is 3.0 A, what is the current in thwg7 0 +e dmnzxy9uma(dj0 m /d)ee9ba0e 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 transy 3ew3:-otlt6lb sm4 kformer. Assuming 100% efficiency, how many amps a o3k6:l s43bte -tywlmt 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 providei1 w /*xzryp4gs 7500 V at 10.0 mA. The primary coil operates ywz* 14pig/rxon 120 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 its secq mbo 2-7a y:vn*o3r5e/z2wxwfwh:hi ondary coil. If 120 V at 2.0 A is applied to the primary, what volta xy 3bw:5hiz-m2vo7nwo *q/: r h2fawege 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 transformerjm tz)578bv nm has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prj57b8)mvnm tz imary, 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 secondary has 200 turnc:; aqsb-q 5mus. If the input c5mu sc:-abq; qurrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 1tai92rj3ex2pi s/1ei00 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can ex9ri j1e ae/i 2ixsp3t2pect 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 3h;m mxj5a (mv/ xzl:lhas 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output ofmhxa5( / v;jlmzx:l3m 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 voltage is usually ste*qf) rg,xu l c/; bces*6o6dfx6 sigg0pped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. cc6 6grsg;le0*d , uxsqxof*i)/ bgf6Find 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 c6letppo*/xhqoc(:; :z8w/ f ahu d*q60 A of current at 120 V. The voltage is usually stepped up to 4500tcoq/uod:p l/wq *z8cap;fxh :*6 (eh 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.

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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/zj9w vsl8*bh 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 Wv*zh bs/wl9 8j. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance;tjioh kh ;x)c vq)rgv5w/j16 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 transformer werecj h/w ;6j1v)vxgi;o t h5)qkr not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a x . * ;wifsxc;j3oi7cgtotal resistance of 0.60 W. A generator produc xi; 3s7fcix c*ogj;w.es 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 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 transmittelx:en34zeo bsu) 8 ky9d down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V?en4:ux zyl s3o9)8k be

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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 genep9v o:nbwx 87arator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator xop nbv:w89 7aoutput be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. ;1xx6zq:w ,mgw9m9ihh lg9 mz u zjb2+How much energy is stored in the coil's magnetic fieg,w99wqx9zb2zl+ju: 6; ximzgmhm1 hld?

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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 r91n xf6lms5kpl) m,ci esistor and an 18-H inductor. What is this cilf1 inpk cm,xm5)69lsrcuit'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 rms volt jm7u7,tcdpjts-(ze4 age is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curren 6:h0rlu,b5fg uw neqe)a)xu 9t?

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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 125jvel gzv c4;80-V AC outlet. What is the resistance of the lampc;zvg4l 8ejv5?

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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 thev 0:gq htfx()x peak current through the0fqt(xg) h vx: 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 conv3- xo1ygz v.qnected to a 120-V ac power supply. What is the power dissipatq-vgz1vo3y x. ed 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 resistormv.mx06w8 pd y ,o7w5 lwbdum) 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 r -q4* .ilcswlrsr6to (t-m 1 hr/svg0oesistor 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 50ml /,pcoy6 4gt-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 reactance of a 1.0-mH inductor at 60 rotfz h5s/-b3Hz?

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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 reactan55n d/hz z(tqq z58rkuce 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 have 14.0 9tr 4 9dw.ktulh ujeed8 1d+b+mav1q-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 ij *k/afrdv17b nductive 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 frequency of 20 kHz5 /m2oc2pqfi ru ko**o is applied toq*2m5uofik*o2 r/poc 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-mf2 e9 kpi7yq-viw9:xu H 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 capacito ma npb3my09jlgnet-.+6 gy1pr 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 have9yjpzw b ;oy;xa5kai r s(4b31 50 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 does a 10-mF capacitor have a reactance of 1200 9 eh)gj0d6sgk 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 6/ cu g0iiii3zreactance of a 0.010-mF capacitor be 100 Wcu0i/ 36iiizg?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz bn45gw5 iou +pand 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 s3h*j .4k pmm3a: mugx12.0 W resistance, 15.0 W inductive reactanuxm.4k m*3 a:pgmjs3 hce, 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 Hz if a 100-W resisto- h6r*sjxca .b+ba/k7l 3cni-1 gmyonr, 20-mH coil, and 1.0-mF capacitor are connecte na3 lby 6gh. 7r+a/jsmkcc1 o*xi-nb-d 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-n gsv;(q2sa8dW resistor, 20-mH coil, and 1.0-mF capacitor are connected in serisqnvsd8(;a g2es?

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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,ucm0crspevg2p(g5*9) :p ,d0 mizv x g what is the impm: 0xu52c (pcpv)r0pmze9gd*, g gvs iedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected inq k +ia9rul7hm08k5wz series with a 20-mH inductor, what is the phase angle at 1005q hwlk9ki87m +ur0az0 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 ser5i iikz8 s0a/iies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 10kaiz0 /i8si5i0 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 capa7p6nj z9me+ 4 3iyfremcitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 mijf79em6e3 np rz 4+yW 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 1cxa:o l,pcj3+mwh/+mufi: az9 ;urlpn1 d9 cput in series with a 450-mH inductor at 5000 Hz for a total im lj9 wdma :au3nc9:r,;p+ uo 11zl/p hi+fcmxcpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistq/b5lx.io; xy or at 1.0-MHz for a total impedance of 150 kWy o.;x5l /xqbi?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the is0z; vn9,yi uqd*qok9mpedance ,vnok 9qidsu0 yq9;z* 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 neejsd/p :rvz7un-tv+l)i)+cs t kv 9gg7ded in series with a 10-mF capacitor at 1.0 kHz for a total impedanc7)u9zsjir -lvpvn++:ctg )s k gt7/vd e 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 kHz for a ph6s9mt*8kkj9q vo/ uz)3ypl9vn vpu 2rw:zf (yase a zk3v uyv9pkyqz: 9/w (2f)9vtujpo6nrm8l*sngle 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 wi3ii57lx bw/ loth a 30-W resistor at 1.0 kHz for a total impedance of 47 /5ixl i3blwo5 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 cap h5g9mx;i 2qpfacitor at 120 Hz. What is the pham h x;5qg2pi9fse 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 c1mf+p8iu)y7l.a oktw3 fxc+k oil, and 1.0-mF capacitor are connected in se 1.iy+7 aof8kkxwc3tp m) +uflries?

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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 10.hlvj+bar nm+56t zn11d x t2n0-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. Whaa21dh6 txz jlnnn tm.v+1 5r+bt is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of 7, 0 zzkar3 vhys/r7rtcapacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cury0s a hrz/vk3r7z7r ,trent 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 is4dbcuqwc 2 36.nm-qiwv .+ vcircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6+d vcqw2-3 vsu .cimq6.nwib40-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 necessa 8bv z2o- d8en)-uloowry in series with a 500-W resistor for a phase angle of o 2b uv wdn8oe)zo8l--$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what 6vu3n. a3n qxhfrequency should the c.ahn633xv nqu ircuit 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 circuit with 12.0 W resistance, :m) (tozro+ari vdt1..uly - v15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power au:l. (oi ttov+r).-md1zy vr 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 circuitvyvpz,u j-3l : 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 an.bxdyw 6*f pc,d a resistance of 30 W. What is tc, *ybp .6dfxwhe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RL rwjzj w*ys ;(jqm*47mC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, m (ywwsjm7*j; rz4* qjwhen 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-mH cfk rgeg /,/4hnoil in series? /gr/k, g4hefn

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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 abgn2 7xvcc 3l0; 3rwjfor a resonant frequency of 10 kHbx cvlj7g;aw0 c32n3r z?

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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 induczgl8:-/anep ltor for a resonant frequency of 18lzlea: pg/-n000 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 ny 6phvx7*+ spwith a 30-W resistor and a 40-mH coil if the resonant frequency ofyp nhvs6 *7p+x the circuit is to be 1000 Hz?

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