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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 unit4yjq hk 5wv/ v.*xca(ks 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 tha ly- ubkmok8(;h::8ic q*ejfxt 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 produceswvpy8f;(m7cq,rr rcm7 iiubeyq,( - * what kind of change on the inducer ( e* w(7-m7rri,umqycqfb8y,v ;p icd $emf$, 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 29m-jtymg x n(what kind of t9 -yj xmn2mg(change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a looprpd r rq:6ae:z1x 6mk/ of wire produces what kind of change on the indu q:6d1azrk: m/xrrep6ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fielpq 2u3r r2+qzf+ hsm(jd 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 ofdtj;c ringh -)p6 k7jo:7kqm3 an induced current in a conductor will be that which tends to produce which of the ftcjkp-i 7)jhr:7domnk; 3qg 6ollowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above its9;zh.r 5 m(q4s kwwsv* 6eccti center with its north pole pointing down. The stationary magnet induces (when viewed from aemvks4 w w9*;qih6 tcrz5.(sc bove)

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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 ogai) ijx7 8 4hmq8y8gdn a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fdi8 jay m8q8hig)gx 74alling 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 tablbid w4ga:8ys nk d(cjow2z*w (f--j9g e 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 in this coil as -zciodkya f4 wn9:sjg (*b (wj2dw8g- 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 levelfcx+k9 u0 ljoohp/:;f*c h.-rzl:k ty table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stroo+;xcfkt: /l r 9-pkh jzo0hy*lfc .:unger. 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 a horizontal table top in a region where the magnetic fiela5ua44a msff805w( *es6wkmhq w5m 2/dt ikcod points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction ofc m4o 6e itffs*u58wakm5h0m5wqas/4a k (2d w 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-peyg)w xy;( f.increasing current northward. Two coils of wire lie flat on the table, one on)gxwe.(f yp; y 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 wire with the north pole enteriikg. (s qbn:xvfc959w ng first. As the f9ckv( i.w 59 xnsb:qgnorth 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 isa mdau8eiwru/ ia.b)3n5+7ry rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis3u.aab r myi 5e8)a+uwdri7n/ 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 sib,h d6gw::uaq:utx0 peed about an axis whose direction can be vaquw0a:: hu6:gdixt,bried. 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.5 h 0mgz3p(b hp3v q5javpwv+yl q6j05
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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 th +sj2k7 n27bl*x hhjqbat 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 magnetic fielq6mpoomv 47y7 v5;q6jsx+c2lxtt3 l9: udp ead. 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 ecg mmp4 6c7wmxghn8*.ast-west direction) is moved northward at constant velocm mx n8c7mwc6gp4 gh.*ity through a magnetic field 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 ; su1ch, 9pi1ps8mnx) if*m norotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfo p27k17lmwg7ctq.vxrrms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of 93wn,er8 mw 2 l n++cdedn:yyus+rpc0thn+c+r n8cde e y+murd0w9s2:ypln3,we $emf$ 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 devic(;e c8gu hw-ja.j6zvdz g2 m+zb;lh4n e 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 thbqgc ) 4;4 r/fgk)x6rfmufu.gtf;g ,uat

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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 contsl1,ee9avwwsa wnvn6s8 o5j 126 5uxfains more loops than the primary coil then it lwww 9afn65o,njxvs 2sauees18 61 5vis 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 sec+9 pla 2d4 f)rcugzth-ondary coil that4p u)r2d zlghc9f+-en 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 input4up 2du fot(/k

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circ 9t nrss n+8-gjk1sfxip-y6r)uit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an idemu1fzk8 x,k nj664ff1b 6lyx ial battery of constant terminal voltage. At the moment contact is made with the battery, fz6ilm1y8fjxn1ub kx 6f ,4k6 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 series to an ideal battktouy,u5 w ;+9b hz,eaery of constant terminal voltage. At the moment contact is made with the,uk+ae zt,;hu 9w5by o 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 h(b3(icl w2jc*xqck / 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 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 / k*g8yk n3qz 3jfd1jiinductance 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 ihzzz 7rq 9 u:cr/qtc:8n series to a battery. The time constant fo:8 qqch9/tz:zc 7 rruzr the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battew1n/uq ar5waj:mt a,wg5 sm24ry is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease 5, s 4ajuaqgn: /amr2wwmtw5 1to

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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 sameq-c ej- 8lv7je 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 tpezw2j d576mf-bz )1iz7oqw current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuitgi evp+ :,pzp), the current, eipp)g:vz+p

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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 factsn64qwq )don8or when the frequencywdn)q6nq 8os4 is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, 84tppjfo .1bbthe inductive reactance 14fjo bt8p.pb of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, tj h)jw8 dvrn7s n*;woj(*;edzhe induct8n;(* vz 7snj * hjwjd)oewd;rive 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 circuit, th0sj47icu/w bgh .z4xce current.04xi j4cbhw uzc7/sg

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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 changesl:- mn0vma kx/ldb;h* by what factor when the frequency is triple:m ;-kanlb vl/dm0* hxd?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cav;phtg,sqqbz /g ay u. gy*jac14i13 +pacitive reacjyv/a aiq y 1g3tq gh.+s4gz*;b ,1ucptance 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 capacitsqux ;0db :p;kqz5r0yor in a RLC ser qd5yx0: ;;upbkqs0rz ies 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 definedl+zyhrf9mnd;kwd+:(8 vv tu )ppgw :7 as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if k i),06ncybs4b8ydrm au+ kv hsk/f,,hcgu9.R increases. When is )rcbkv+6b8aks,u4fhk9 i, y,0s/ugd cy.m hnthis 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.)pbbr dx*fanx1t1uwn g n22 ;/ 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 imx2 u/8tu.ppc mpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance bo h,dc(3xmy7-hm w/d etck a(:eth double in an LRC series circuit, the resonant frequency wcy a:me3 -dct/h,mxk(eh d(7of 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 applied voltage. jn9b/ tjt 1wve9; p( qrgbu. dz-j1yl.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 circu u 9eont1mwrpv/hi7- x n q- 1v*aojm4/iel8y1it occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0agi ogmli +eco+ n-2.)bkrvu 2y ye885.20 T. Find the magnetic flux through the loop when the plane of oea uen)5-gk8lr8y+i im yb2o2+.v cgthe 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 uniform magnetic t*49hli )o fq kodpq9-field of 0.20 T. Fi9 dqt9-k*fp4 i ol)qhond the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius vl kp oum+*9p ;x3qob)0.10 m is rotating in a uniform magnetic field of 0.20 T. oq+km3 p9l p )b;v*oxu Find the 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 adjbnkjl qh1.5nib+9ce.tbc 92e4un n8justable 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 xzf cvl3vzznn7jf nb8 *+0s2o.kl d u(5fa)f: changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. ;e npb n*3ceeb.9pvvh6+p xd*A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes bn; d 6*ppn*pe+v e3hx9.vcebuniformly 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 tug ,g8a ;n)ad3bpjt+a yrns 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 arevo2,4rph,: x4 ivlkri a $0.20 \; m^{2}$ 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 fli47j7 +/ e1i xpurrijgtes horizontally at a location where the downward component of 7x7/41iip gj+u jtrre 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 rota4 wg 5:ccl8-oo1yf w(i8frpga tes at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of wpclf54f1a oo(w i8g:cy8-gr $5.0 \times 10^{-5} \; T$. 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-sgu2)yd 7( 5 i6icd mkf-k6prbgectional 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 consis4frpd.sev 38p ts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loopsdt 4wx: 7ujew3 on its armature. Each loop is 12 cm long and 8 cm wide. The armatutj:37d x wweu4re 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 rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tii 6phl /4*tgq(rh 1yvurns 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 simple AC gcje :g :jr4wgs7a7l) +,.uxtzv9 vlj7su-b vsenerator with an output of 12 V maximum when rotated at 60 Hz. A magnetibgurt j)s ve s:sulaj+9 wvz7x4.77-jg :lc,vc 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 maximucgtjbq 0)sjx,ct cd.hq 3).96 jgy:cvm $emf$ 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 m rn oplvrp/619mp8* xrotor have a resistance of 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. Th6kr l,iz -iz:cx-nsroo f d,2:e motor operates on 120 V AC, and when running at full spdckr-- : f :, zzlsoi2x6ro,nieed 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-Vbr6lhjn n4g-u3/ o; u*o3cv vk power supply. The operating -onjghb 3lk3 v;v no*6 u/cru4current 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 a 24-V power sbau c3vw.txjd1 ,( kmd0oqx9(lx, uo8upply. The operating current is 1.0 A at fdx0 lkmw ocxv(a ou38q,u.d1bj(x t9,ull 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 interna wiq, ;c)8dr9z:9hmi3ps q f ,0yagcayl resistance 6.0 W is connected to a 24-V power supply. The operatin :i,,a9pf09 czyhm;cg)id3rw aq8yqs g current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage opz:nyek,8ji q4cwu83vge(km6u 6 k9 gf $120 \; V$ 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-turn7u:ualnr/ d/v primary of a transformer causes 14 A to flow in the secondary. How many turns are in the 7/:nurv/aud lsecondary?

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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 primh9i o d/12gy(hs- opnkary if the 24-V secondardh2osp( 1oiyhg k 9n/-y 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 primary coil and a 2000-turn seconda9cyflyq ;vez uzu/ mm.--h, (fry coil. I 9v,-.zfmf e/umu( -y;lhcyqzf the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% el4)idg2r ln( :b hql7ifficiency, how many amps at 24 V car 4 )dhl2b:(qiilgln7n 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 1 hf:.j2d zvmc1ncg;xzz- 6;vw0.0 mA. The primd1z -cm c6.gvzvf zx2;hwnj;:ary coil operates on 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 iri yv rx+f/q2q59h:h9/uz sujts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what sq r9 x/2zhj/u5ru+yf:vihq 9voltage 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 has 6x5;zpy9q(kdc4lqa,ag(6 sd5ll yo c *0 turns 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 in9yqc*6 x5 cloas((5la,yl d ;q4zg kpd 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 207ltbp 3 24/cbssoi2o g0 turns. If the input current at the primary is 100 A, we can expect the output current at the bt cio2lobp3s2g 74/ ssecondary 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 tww 1qv/nyopux(( 5e2+ hvob 1uurns and its secondary has 200 turns. If the inpu/w u1yh(eo2 n +x15uwv(p oqvbt voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns fsoe42ls1) hq and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect t)2seo1l qs4h fhe 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 voltage is usually8jg6gpng;4.6rmzj, m4 3 2xsb aren if 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 primary h6f3mx2rbg j.m4g, gjn;rpne s z468iaas 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 steppedcm5+qs *xq/lf :n2irh up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 Wn5c/ xflihq +s:*qrm2. 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 c)p1ccy bz6j/x90vrcg m ,y/rksur*(q urrent 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 p )c *yzbjsg(v ,//ykqux0r9r pmc 1r6cercentage 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 of 0.60 W. A genet2*hg vlz2g-pmf:jxb1 0-tfk rator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transj* tp1tx 0b2g- m:-hl gffz2kvmission 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 lo wv zsy2jox+;3ng 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 transmissiy vz;32so+wj xon line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much ll c/7cn6 wh)jness power would be lost if the power were transmitted at 3000 V iwcn)7nhj cl /6nstead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 : 1.k br 5*zebaqdddk(A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the gbd:k rd*.zb5qed 1k(aenerator output 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 currvb(q4m q/ x3owent of 5.0 A. How much energy is stored in the coil's magnetic fievw 3b(4ox qqm/ld?

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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 inductora8gvn0vh/tm5 0bou3 u. What is thisu08v/ogmht anv03u5b 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 an AC circ(i2-5q j9jbyn(vathivld5 w* uit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currenf4ttos fnb.f9wt4)i *t?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thex 1in h3ohkzgi*9 mp52 resistance of the la25x mi3gz9* onhphi1k mp?

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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 supplcf5ai 9viqra3/0tqw 4y. What is the peak current through the 4i a3qia wrt09f/ v5qcresistor?

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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 tm ed/ill:.6n wo a 120-V ac power supply. What is the power dissi/m ldw:6ln.eipated 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,u8as nsyhzkj a s8.p6yq.)/h 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 a 50-W resistor i el )3oq;btk4cs $I = 0.80 \sin (240 t)$. 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-Wqlr sdecx)o(dz(ign)s 7()x 9 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 r ojkd4sy-(2ytd,3w rk0j7vfinductor 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 reactk-),t 4bz- ctlz upio7ance 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 W of inductiv* s0px2 dv60gig*f41v zkx3.vwukj mye reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 4ijvid arn34e1v5 jt01000 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 .55ixfc6o jx aat a frequency of 20 kHz is appl.jfaixocx655 ied 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, , a7.w:l-r1.cszih6 xegvmv a60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz?c30h6 yg: ogb qu(4pcg

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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 509t y/qww, b-f8lnsg/ i 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 rea+ (g, x+utnseiz9w 4osctance 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 0.010-mF capaciqw 7v2z 4feya4lew 1t4s.sdw 3tor be 100 W?el1e.d 3sa7zy2w44wf4vt ws q

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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 1007 ;yoe gz3srtj 9gx-o4*fg9gm0 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance,,s /.wknct(ddlh-3ey 15.0 W inductive reactanckds(y lcw het-n/d.3,e, 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 resissb2-++zrv, u adatb u6tor, 20-mH coil, and 1.0-mF capacitor a+s -tvaazb+ru d6u2,bre 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 angle at 1500 Hz if a 100- bpg 9- ftzctfk3 ijsbgj89)(r/,)xtqW resistor, 20-mH coil, and 1.0-mF capacitor are connected bz(xckgr,f t)/t i8f 3qs9 -jb9p) tgjin 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 s uqmiwav(l7 io-2 m0bfs- kj+ dx8uc-/eries with a 20-mH inductor, what is the impeda+b-8kws/c- i jq-v ialu2umf70 domx(nce 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 in series with a 20-mH inductor, what ism;p74rpsov7- cshtdc9i o*t1 the phase an1cprs tio9hvo;m4pt c -7*d7sgle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capacn +xrm2p10g:ssvw c q5itor for a totap +5:nx1q2r ss0vg cwml impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriejmy ;2/hkhz w1s with a 100-W resistor and 15-mH coil to get a total impedance of 110 W aj/zy 2 hk1;hmwt 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 ijmjujw 2:ry pe93adfsm 4.vp*jp, 1 )jn series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?amj*j3 mu,. espv d):j 921jjppry4wf

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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 19k8qkg5pl6 dqt,-; vchnx g.p .0-MHz for a total impedance ofp lp g k;kq8,vc-q.9nhg6 5tdx 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. -tdvm+l qn. se*1s9ok 83ykncWhat is the impeda1 s+cv38.on k *nt9my-eqkld snce 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 kHy0 oobmm )35jgz for a total impedamboygm j0)o 53nce 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 sei .dnaj52f(h.spc mm8ries with a 10-mF capacitor at 1.0 kHz for a phase angleh.nm5 ac 8j si2p(.fmd 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 resistoq r6w hi9(+vaor at 1.0 kHz for a total impedance of 45i 9rq+ah6vw(o 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 Hz. Wha; hobcsfes,x *j,z t55t is the phasejsfzc ,th, *oe5;x5 sb 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 ixnet fo :57ek7f a 100-W resistor, 20-mH coil, and 1.0-mF capaci:kn75fe t7 xeotor 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, a4 c opr 0rdpmlcpzwvea0uj:-0(: .z4q 10.0-mF capacitor, and a 0.350-H inductor. The circuit is conne e0cr4a .p- czp00( :opdwzmr4jqlv:ucted to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of ca7+futwkjgy4)k rx:1v o2 q ua3pacitive reactance 30 W, and an inductor of inductivkx3vwu2kofu7 +q grtjy :1)4 ae 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 resistor7se6a)qjb n 6 knbj1-n, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?sb6)a nkqnjejn6 b1-7

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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 seriecvip b 0oosh4g49u2wzk1 c92y.rc g 8 rse:t0cs with a 500-W resistor for a phase angle of b 4pgcuwr 9t29:ohcy4ce20s. r8z1v ig0ksoc $40^{\circ}$ 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 = 4 uup+5v xb q0daprl,,200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximl5u,xr0d vau4q p+pb, um 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 1eyz lz(q+d ar1m6z+ +lkz ne;;2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sup zkqde6lm+ ;1r zzez++(yl ;naply?

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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 circuit ll//vom5i/dt(pv)ub 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 resistancoe*gc3wsf +xm) z-x9 ne of 30 W. What ism*o fcn+9sg x-3zxw) e the 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 y sem1pc/f -l*k;;qxifor 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 power ;kpy/-cfi;q *e1sxl msupply?

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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-m83 ufs -g 5ogfmynnuae5ju18 2H coil in series?me18fjngus u 5y ufon8a5g-23

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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 resonssc w(hy682jk5e+ /os9uk:t3 slyhoiant frequency of 1u ytl5s 9i+sse6cy2o3 j soh:8k hw/(k0 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant frequ4c ze95ev0 d 9b5t2c2 wxgxmhdency of 1000ewc cxv5z2xd 29mgethd b945 0 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 a3 nj3 njx;*nqx by ,vc9dd0n4l 30-W resistor and a 40-mH coil if the reson3q3ljx* dn4dcj n9bn0ynx,;v ant frequency of the circuit is to be 1000 Hz?

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