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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: 游客未登录  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 a:*7v ( beca l(byl1hxn)ro.j 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 stacy4xoz/ga 0bba+ wb k-gne 6- j7(t)botes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in m+,uvef t4 *xsa coil produces what kind of change on ttmv*sf4u+ e,x he 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 fioq q4;gb 6z*y st7ac.leld through a loop of wire produces what kind of cqct*y76qsb ;zogl. 4ahange 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 of chan5xy- z8 awmes/ge on the induced /x as-8emzy 5w$emf$, 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 sz ,ew), n-hx1:ttw0d o0p3hzeh6td tfrom 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 conductorsv83: jmb q3xj will be that whi3b8jm3qj: sv xch tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flav9 g.lv1:p enot on a horizontal table. A bar magnet is held above its center with its north 9vl:ep1. govnpole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontalu *2 fn1wp1xk ty:2ydv table. A bar magnet is held above its center with u:2y* vpft11 2dkxnyw its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top;jm og8ff s1 :+jf2bc;19+kqbkydrjj in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When vieojs+cb1j r;kdj;29fyf mk18qf b j+:g wed 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 le +a0kkn5lq9y, mbr2 hevel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from aboark 5mk2,e+nhb 0lqy9 ve, 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 hgq66/37c uilo:ht5/ wpc ptcd orizontal table top in a region where the magnetic field points straight down. The ma5:6qt/co w6 l /pig37cucpthdgnetic 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 horizontadpr6kk* p:o+b l table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, o: kk p+bprd*o6ne 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 wire with the now o1j 5da.(jcsa0zrn-gh 6r+ xrth pole entering first. As the north0nh6sgo 5a.rr1 dz-cwjxj a +( 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 rota*y/3j n flk/jmted 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 axis of rotation ifkjm3l n/f* yj/ 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 szj1xm3fq9 ah c::)q ndpeed 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 axis of rotation if th1:dqj fc zqma3h:x)n9e 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.fz t;zh zgq868
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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; 7)yh5xz(j l- daiaro-sgggae*e3l0 1jsmj3 at 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 magd6e -2o cuy0gnnetic 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 thauamauq4 b*q;(.ceg6r *jot3 r5i 3yie east-west direction) is moved northward at constant velocity through a magnetiirrj3*u i.g b3ao;q uaaq( 6e4y*5cmtc 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 x4lgplx; xne/9gt ly 0bx/t -(rotates 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 generatob,kr6do-ypo 9vvj.p(yeg:k , r transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency m77;jq z- jyxur xgd+7bdp);tof thg;7 qp7d zbxymt) 7;xr+ud- jje $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used, rstu1: lyxj-11 jfngr6f1vh 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 deuws1 6 tulg5bu r2l:bib87s )pvice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than zb3.whstgs3ba.d /8qz.) t6o 1zcyz0rnt0v hthe primary coil then3hvz. znc86 twtbyzs )sg00 b.qh /1a. orztd3 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 secj /m0t/ aih qao868 jcpw1e f3g9bgp,gondary coil then it is/jg qpc8apbhiow9g1 me/ 86 agtjf03, 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 podr fg:7e r9, mh(,tfsower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circd d01f p -hoc2xjbo)k(*b 5fkiuit,

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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 ideal batte)9e a4md r*5h.kxvio hry of constant terminal voltage. At the moment contact is made with the battery, the voltage ac4mk) voh ix *ehrd.a95ross 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 conn56bjo olgr 5 o(/qe; as,/yucuected in series to an ideal battery of constant terminal voltu/lj o;g5oe sbuay,o6q(5r/ cage. 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 connecx:i5mh.m.d r qted 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 connect zixh443 3zgsted 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.x8oblnxufmn9* t q+( - The time constant for the circuit represents the time required for the current to rean(8+xl mnftu9b*o- q xch

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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 a; +*k5 hvhgveixwy;4z*w0d1jlyvfo:b+c w0lre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents+h5vcwxd l 01j0l wg fowyy*v b4;z*he; +kvi: 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 hav wzza7x 7ef;2z wlh/9k,am o4ye 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 pomu hlsk7w.yft7 -p3t 6wer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this;+)lesy qspe+ j9*pds circuit, the currendsqse ;s+) *9jlyp ep+t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor w m5)oybu io(p7kkx 8x;hen the frequenx )8;7 kiy5(ubopxokmcy 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 doubldx(6nv(p5 2st cp6wozed, the inductive react6w(65t2n pc dxz(psovance 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 induc: ayu;k4 .(wf )vukipjtor approaches zero, the inductive reactancew vy4aj(u; pf.kk: iu) 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. z w 73fmsf9o9z In this circuit, the currentm9f97zsfo 3wz

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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 circukjymmle swv1 q+(o9+))hci 4f it changes by what factor when the frequency isjv1ifc(ly4q) )s9 +om+he kwm 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 voltage across rt+fojy,0vfj- w6u6mfj m(a ;a capacitor approaches zero, the capacitive reactance o+rvff6wt-y ,m0j a(;6jmjf uof 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 vol xsfk3tm63wc;u,ohb :s zfc2)tages of the inductor and capacitor in a s,sk2m ufow3 zhx;b:t)ccf36 RLC series 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 circwk 3ip: n9m j/yw1r6;yvw5xiruit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. 9q ios;y(db87d;) 4eoy7zr v c .cmccm The impedance of the circuit increases if R increases. When co84 m;.q(bycy9ioscz)mc ;vr7ed d7 is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ipi wctap ka0084cg +./p fc2 t8vkzlr*f $X_L$ 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 o5kq k 7e16zu3t6 nr fj1metc,uf the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double7c yrf 9iklh -w3xpe)m9(p(e h in an LRC series circuit, the resonant frequency r7k(c y-e)hwp3lm9 ei pxf9(hof 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. At reso:,zj 2giye aa e7:ji*anance,

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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-wb/dj9 o b5mfrhl 6y/5qnqv2it 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 db-jkt:y+p k p7ija.ag0y,j4 in a uniform magnetic field of 0.20 T. Find thepy- bg+ay 4 kk.7,p0idjta:jj 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 rot pqr+twxm r*f yj,3r5(ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when t+frjp r,mtx qy5(*3 wrhe 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 0.10 m is rotating7mg + mv4l4zaihg +r,n in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the n,hgiv+rmlg+ 4zm4a7loop 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 singlwxx)q*m q0/cf5rlsn4 k; vml1e 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 changes fu i)) i(tr9nhy w ; 1ckkjjdglvr4, wq/.ys.b)rom $4.0 \times 10^{-5} \; Wb$ 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 squ 2s is(ys(qi5tare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from2( stq(yi5i ss 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 an/uxrj:t z31n jd 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 anzigdfqv+t8b n9o d,98 d 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 vmy u aqnsf*(vj5.kxo c* hhg8w+h m4 )g(/nc:m flies horizontally at a location where the dow/ ycn(*:hjvfc mh wkos m4)xv (g.hng*+5ua8qnward 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 angultvfe m0/q1/hd dxj 3j.w+us.z .c:d ifar velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetics mq.d:cfhx3. ue //d0j1wf+zvtj id. 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 encqh0onsc5e14vs(e g 7e6a:tional 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 consistxc 6 f qqgj 83v/iyf-rr;3u(ebs 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 loops v7lho5v m n2z +j5pyfhx/ il7(r-dv8uon 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 rotation, what will be the maximum output voltage of th hdm7vl7 5nh8 i(- j+r vvpxzy/fo5u2lis 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 consist1 :*:nnnii5lwz1cg r ms of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of ur 65e6l7z9 pal vb7kfjkt,y6t+.uml+ , ktao 12 V abj7ut.y76+rl zplkkm ,f 96et+ l5,vuo 6at kmaximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a m1u8qzz: (j d(yuy +aesaximum $emf$ 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. a 08yotv qk1+ z ty*dp)5ey0mpy 80vbdThe 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 resistbg8d c7p02*i (u/ws ae adu2z8x3yxjrance of 6.00 W. The motor operates on 120 V AC, and wpsd a2geuiz0d8c/ bj8rxxyw *7(a2 3u hen 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 24i e/*ar2as-rgxp)ut 4bu 3zp0-V power supply. The operating current is 1.0 A. What is the start-up currenuusra*-p grt 43p /0)b ezx2iat?

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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 xqf8lgatt+66 power supply. The operating current is 1.0 A at fullx6 8qtg+ lft6a 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 rqdpao/ m26 :j)u8 j*.)5wxwceirpv o eesistance 6.0 W is connected to a 24-V power supply. The:o*xwr 6mv2a cjw.e)e q) dp85jiuo/p operating 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 z ty/ae46ayi9 .aej v z;.4xjdto 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 pjrp(6 m+w /km y5s5jd/i)fwgurimary of a transformer causes 14 A to flow in the secondary. How many turns arer5(5fsmjwdiu)6yg w+/pm k/ j 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 necessary in a 110-d65w st ;)ai;z -cit y/br*cisV primary if the 24-V secondary t*dwir ci ai zst;by )56;s/-chas 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 secondary hhne0bj1i86 ertwk:;3 8k dn.bh: orycoil. If the current in the secondary is 3.0 A, what is the curhnk31b erd0:rk hn6jhi8y .8w ;eb o:trent 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% effic82)w2(io o y )xemq:hwz;jvjtiency, hvw2zj) )q2mjyt: ;xiwoe o(8how many amps at 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 transform dn;d8js.bj3 ter provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does tj.tsd8; 3djn bhe 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 5s-y 3kl ofyv,and 300 turns on its secondary coil. If 120 V at 2.0 A is al3yvf,sky 5o-pplied to the primary, what voltage 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 60 turns oaq+l zhmr tp4j*yke65i00,(ua msr(s n its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?+5h 0*im ltkzma( uy(,asr60 ep sqrj4

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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 secondar*i39vnvl j*4pxe*dr ey has 200 turns. If the input current at the primary is 100 A, wjee dvr9in4**l3 v*xp e 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 105cj j;*mv u61 lz vfa6odciwg7*7t vb50 turns and its secondary has 200 turns. If the input voltage to thv mb1 *ajo*gdf6li5;zuvv76w 5tc7cj e 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 haf (vzw-a i/ kg71atsvwx1/0a;1cu nfws 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losse0-(7w11v kwinua1/ wvff;ca /txgz sas)

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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 *;lqom 9dy ::drulguo-as/ b1 of current 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 number of turl/d1qdgsro : b*; 9ua-mlyo:uns 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 vo ltp6w b+4uzsz;)rzcrx 9a5n9ltage is usually stepped up to 4500 V by a w;s4 rr 9pz) c5nl6u9atbzzx+ 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 Ah un 1s7zj g10smm-zz4(wyfoxj3 nh 21 of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisthjuz7 fw 12o1nzz( y-4gsnhmj31xms 0ance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60a).is6kemj 0nh,fqki 6i3p* c 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 transfq)mii a6kps 6jin ,*0h.ec f3kormer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a tot:fq9u8cn n xa ql/**zqal 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 wq z:/nq9*l c 8*axqfunith 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 gjq 8-h pd(0rrswgt/g8 n;bm.. How much less power would be lost if thr80j (gh.rgq;/gnp bmw s8- dte power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a zdli-jl+(-vj c/q )ckline with resistance of 0.60 W. To what voltage must the generazvl)lq -ci +(c/j-kdjtor 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 current of 5.0 A. How much energy is stossau,)b(ucs eni5 e75red in the coil's magnetic fieldcub5u aei( s7n) e,ss5?

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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 a0*/.mvh)w6q:gk oibeyt:ib-wju/ mbr9u : ytn 18-H inductor. What is this circuit's th0ywe-q m:j/b:b*otbu6)iy9k/ utv:w.m r giime 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 rmsyxj,ps2e htv dw o85/t ac85r3 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 i 2ze*09.w axkn rfzgz/s the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resisbw ;bz+ wzm(8ftance of the lampzzb; bw(w +f8m?

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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. 6)fkwj.qxeh ,t bzs 5, What is the peak currentjkx)q.zwht 6,5bs,ef through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ahv myh/ . j nd:izqg.z1h;bhcd/3rk90 c power supply. What is the power dissipated in :h.0/khdz/ rmvn; 1 cdhy.jgq3h9bizthe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor issg94gd5ja 4af9 wjl; fb dbz57 $I = 0.80 \sin (240 t)$. 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 a3 .fu cz)pqn:h 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through gb7 +untu ( r7/be wdzvv1c*m8a 50-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 6w 7 s(j (gmrhwxpb5ie5q32c6u 0 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 reactanc5r9g ja*f2nyald;c.b e 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 14.0zys f7 gl01-ra 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 inductive reactance at 1000 :4us ybtoz 5wt2 (p+hwHz?

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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:+ v,y3jokwlh-mH inductor when 120 V AC at a frequency of 20 kHz is applieljk:h 3ow yv,+d 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-mc6w j5iicp2:v + :hlrpz8zg8mH 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 osc-oe7x/kdccxw16 + itp 87pkf 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 capacitive reactance at 10d2f:oexg)q*. 5d l zkm 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-m;y(zb mbzuubnkic,(5vb(7) aF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 4:64ml br-d2h /g+23w iwvau pbzr pui2o6h xw0.010-mF capacitor be 100 W?h 2i urud wb4 :gx rzp4mi6w6vohab 2/+p-wl32

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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 ub-jdq k7:iyo 9,sig8 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 ;dmmmq,1.ccr- td; wqac series circuit with 12.0 W resistance, 15.0 W inductiwd;qct;1rc m ,m .dmq-ve reactance, 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 resisiv s( g 6nmdw,.dzzx y--53(bifd xs45cii 0iftor, 20-mH coil, and 1.0-mF capacicxvizb - i5 (3ni (fxydi4d 5iz.fm,6s-gws0dtor 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 angle at 1500 Hz if a 100-W resistor, 20-mH coil, and wx1.9 f-q)tov . qvnqd aw;sxu1ta3 0u1.0-mF capacitor are connected in sewqxqoxv3 t ; -a)tnqfa1vw0 udu.1s9.ries?

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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,qm2 x9xd76qm v/dp8sq what is the impedance axmq7qsx 6v9d/8dq2p m t 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 2*d 3gxf.kd bynm ieus8:ljes-g 2ht 3pg6717 t0-mH inductor, what is the phas8:gg3ek27*dbn h 7t im61 ssg-d3t.fujp y xele angle 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 ag; nk:me-t tb3 e8tjly 7r.b.s 20-mH coil and 1.0-mF capacitor for a tot;etgn87j t.e :3ykr lbtsb-m .al 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 series with a 100-W resis3 *qohp0 qq.rptor and 15-mH coil to get a total impedance p03 qpr.h*qoqof 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a 9-t inufn u/e;tott/inu n-;9uf eal impedance 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 w(wnen -lvogo ia(+n7hs, /rsg k06.e kith a 100-kW resistor at 1.0-MHz for a totalae6l/( vgnn-.r0k hs(ogonsi w+,7k e impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in ser82mbvd wkuq *+qf9p4oies with a 20-mF capacitor. What is the impedance at 1000 Hz?q9pk+o*fb q2v 8mwdu 4

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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 kHz for a tot1)qm6n yczsvwa- o ay+ *nc9q+al impedanmyczw) ync 1aq q*9+-6voans+ ce 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 withneslij d.u7:5 a 10-mF capacitor at 1.0 kHz for a phase anguij sl7.de5 :nle 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 6evt*r1*0iwwtq nk -f ,pk muy/a34 bzseries with a 30-W resistor at 1.0 kHz for a total impedance of 45i6tn 0 kp3qba*rz1 w k4/*wtuyfev, -m 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 v0yvi1k-ck qnz+nr9 i, /w *ihHz. What is the phasvrzyk0-i iwqn c*9 /k,i1n+hve 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 150io;4;u j23pzyeu7zd v 0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connuj; p7ozy;v2udi3ze4 ected 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 resnbkw)1-bfgd v) :ows4istor, a 10.0-mF capacitor, and a 0.350-H inductor. The v 4 gwo)bwkfd1)-:bsn circuit is 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 capacitor of capacitive reacta 4.nslh 9g6gkznce 30 W, and an inductor of inductive re4knshgl9gz. 6 actance 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 circki1h5s)( amuqq br o/;uit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sso5b qr; 1i m)(hku/qaupply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series witk7crrb+8k t **jbm8 i*h ,bao*xbo4iih a 500-W resistor for a phase angle o 8cxi,h78amo r4 rbib b* obitk+**kj*f $40^{\circ}$ 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 frequyfqux gm+ s26xf qp2 bqke5i1*.g kz--ency should the circuit be driven in order to havezqb -gfyfqsk16i+gq .5uepm-x2 x2*k 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 ous3h/eojmb ed5fo;:uffv00 l - tput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12m05o lffobs3he/v0 d;j:ufe-0-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC c qs.3mpvl3m b+denf/10n14af oa jne6ircuit 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.+on)vxf 5 ,0k1y9 mgl)qwqonf What is the m y gk0,fn)o)1fnx5wqqv +o l9power 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 RLC circuit containing a 50-.uw/1hsd) /pjyh p q0nW resistor, a 10-mF capacitor, and a 0.45-H iynqupp1w)jhshd0./ / nductor, 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 pve vp3 /-ilq+a 1.0-mF capacitor and a 15-mH coil in series?/ep l+-3pqvvi

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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 serie9p,d/fkb9fb6y okd:ks with a 4.7-mF capacitor for a resonant frequency of 10 kHz?9 bk/:fbyk f 9,6ddopk

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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 sel r fd.o1ja1fh+1bnd5 ries with a 3.7-mH inductor for a resonant frequency of 1000 r1 on+l1b. haf15jddfHz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30hqo(wy )4 yiam wt. 2bdmohwv*3u80h0-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be )bhw wqi(yh d.0*vuw4m 8h ao 0tmy32o1000 Hz?

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