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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    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 cg5z.h,lg ml 2 yb2e 5vva5bv: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 that the.w8xsgb5mh 7 c $emf$ 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 prod0jrlu) h4-jfn uces what kind of change on th4lhuj-r )fn0j e induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produce;g87k-ihzz uw l-u 8ryvh69bts what kind of change on -z6w 8uyi;9r -b hgvt 8l7hzkuthe 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 wha-qcovl2.irq +t kind of change on the indu2r qc+-lovq i.ced $emf$, 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 fr3 c2p g 57rjlo:,sb+h*r*w vnd2hao yuom 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 p.4in*h1 e)r l*+gc)gr ie+so ppalv 6current in a conductor will be that which tends to produce which of the following effectsgp. lsp gvr *4a )c1p e+)eorh6l*+ini?

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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 tat( 4sc5-blcc wble. A bar magnet is held above its center with its north pole pointing down. The stationary magsbcc4wctl-5( net 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 flag-q oyvf5.p s .ka n:sj08)dcbt on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it :.pocy ja5 .q)sdkfg bv ns0-8approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fiel9wwk qz-;e +0txw u.-- rxefppd vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thix 9;tw-.wq0p zx --pr eufwe+ks 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 leve7dxq3+f;cbw*ka jn w 4l table top in a region where the magnetic field vector points sw3fka dc7n *b+q j4xw;traight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where tv17rcd*h2ro zp 9oqml e65zsn6ld::hhe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, :2h z: rvm6o 6qr1sch9dp7d 5ozlne*lwhat is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and c9 ;ue.f6s6hdwk*r uwqarries an ever-increasing current northward. Two coils of wire lie flat on the table, *9 qfd.;usewu6hk w6 rone 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 wi2-gag opn-g p+re with the north pole entering first. As the north pole enters the wire, the induced current will be-angg o-2 pgp+ (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 angular speed about an axis 05dqxywn6)ts 6:ixvbwhose direction can be varied. In a region where a uniform magnetic fix5t 0nx:s6wid)yqv6 beld 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 pf )ib+lvy8 h ,to9;l 0p7:on 5rgbmnjrotated 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 ip n;m t+7pb9,: rgb) 5vj8ofl lhoyn0orientation 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. dwhz 2oz9 ep-cu,tw( h5w.)16-qpnu7eblbui
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that qfqg-twghcbw397+h *o1g ;b oan $emf$ 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 mag( 8adfa.u d9utoh 62tonetic 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 north(e hb)nf g,tz3ward at constant velocit)fet,z(hngb 3 y 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 rotates at a constant angular velocity+ m e*0 n+(odnw4kwai;a-cxhb $\omega$ 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 t b.4vgxq/:+ t 3ozk erbkl6lh(j,pbs: ransforms

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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 revol-ocj 79w0f 7v+7;zeh enbsxc xutions each second. The frequency of the +x esew 9 7cfv7cbo0n;zj -xh7$emf$ 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 usedxo, mbf3ko p89 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 t0fkq 4hf6b*w qqw-ic)hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if95jnzb2psrmx2 u0 x obikz:3vn9 +n)i the secondary coil contains more loops than the primary coil the +u9zn0p r:23 mio2bn )zkxivjb5xn9sn 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 the3u7u0lgu5bs l secondary coil then g ub0u753slul 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+oby8 1309tmsn qwdx j power 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 circuj;si/mx un h+,n0w4j8 xfkp)iit,

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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 battery of con; 3gi5k+unp zvstant terminal voltage. At the moment contact is made with the bat vp5zg;+in3 kutery, 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 battery of const,jkvjd fgy :)2ant terminal voltage. At the moment contact is made with the battery, the voltage vfjy )gd kj:2,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 wb1gnxjpa vgp7xman/z5) t7 ;7ith inductance 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 inductance L and resistance2wqkzdcub 0jp 9/zd;5 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 indu:( o1r beey(4snt*azkctor are connected in series to a battery. The time constant for the t(4za es1(e*:o bkynrcircuit 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. 9.0x9i/p1xfabz qe go The battery is suddenly removed from the circuit. The time constant ./9 10abzge9opf xiqxfor 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 l3pb)svw(yr w/ a5 mv;c1ao7 rsame 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 cuq*llj(o8ycv4ex,u p(m m e2f3rrent

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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 su;vq :: ax6sd4j+d.qs-kqi ml rpply. In this circuit, the current :q vdl srxj;+d:.6ak4-ismq q

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the dzcpa04j y qr6 8nhs.h4h:.yvfrequency is triply04h4:.dhpv ry8sc6hz a jn.q ed?

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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 volta kq8ovdv)w e,4 9ajk)jge across an inductor is doubled, the inductive reactance of that inducto 9vd8jojv e,a kk4))qwr

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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 rogs/su-vu0+y, j og8across an inductor approaches zero, the inductive/jssg0-y+ 8ur o,vo ug 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 Ashl.ksi2u.(: m 3anixC power supply. In this circuit, the curre .s3su2 im in:la(.hxknt

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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 wh+*q2f w6xe+umkj 8h luen the frequency is tripled?wq+8l 6um2 e*kju+fhx

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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.(pj;2)elo sh,fqx m y)jyu4n a capacitor approaches zero, the capacitn jp fyx ;qhs o)(u)ej.,my24live 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 inductorrksx 9 ypeg.6xc-. v0g and capacitor in a RLC series circuit6yv cxk..r9 0gep-xgs?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as a +5h/ (fhzuc4ffn7soj)h0uo $\cos M = R/Z$, 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 t k wlo3yx1sz* xu5gv/3he circuit increases if R increases. When is th yz1k*v/s53owluxx g3is 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 circuiqcjujp pr: p9;nv65g 9t 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 i;:f3vt-7 tlkuzcdfk * v/kdb3mpedance 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 both double in an Lbx.i2q* vl-ax. v6w0z((x rfxfct2ujRC series circuit, the resonant frequency of that zx*2j0clff 2x ( vwr.x.6x(baiqvt u-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 appliecxyfawlim) qnqjg 3,8(pq 07( d 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 whr:+pdmhk/wvt): ae5mp0*pgzen

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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 ruq -w fqxp9o9 0da b0gj,g)-qcotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plab)9c9a0j-x ,p- 0quwg qgdofqne of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a un(pl+zqq;2vcj /p- q muiform magnetic field of 0.20 T. Find the magnetic flux lq/ qu-mq+;zcj p2(vpthrough 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 radiwn2 e,hozh*/bus 0.10 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 fie b,whon2*h ze/ld 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 sinkxo937tzqu9q o /mc*b gle 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 chanlm5p;d63 gwz +iz4o89znv ylwges 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 z/ gl5bpt -vq:square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 ilpvbq5t:/g- zn 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* ns)x+, dfjqn 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 and8xexvieac +eo fq2a,30cye91k:no y: area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a loca)hld qmuv( 5e-tion where the downward component of the Earth's magnetic(e-lvu q 5dhm) 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 constowoln,ga+2t*,da) 7g6 xa oqyant angular velocity of 2.0 rad/s about a vertical axis ,alt y o6aawgqn2 o*7 +x,od)gthrough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional arem78 uo(7ek: myt8xeoca of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are1,p ter /k623j . j4rgoc r2oon;saakka $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Eachcx(vo hjz+) u+e6- *l0 tzgyhu.5x iu.iok6qv loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long si6k+. 6c+xyo. 0i-iguxv5)zevjzoh *uhtql u( de. 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 tu*wcn p 1fym;ujx km20h;y6 9surns 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 simplp3d4bbosl. vuf:-f0nn6 bg3y e AC generator with an output of 12 V maximum when rotated at 60 Hz.36f gby3 ds4uvn pnb lb0f-o.: 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 gkk ,x a(rznj1-enerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motx;.i w-.qw,4f pizvflor 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 rex0 inyp( ui 0dsrp)h/2sistance of 6.00 W. The motor operates on 120 V AC, and when running at f 2i)x0/ru0 pnip(yhs dull 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 resistanc at xkw6ebyx *;-z8h7ke 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up;xwa7b8 6kze tk-*hyx 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 thf caqgsh6/4e*ni /8 uo a 24-V power supply. The operating cur/8 *qnfsguech a6h4i/ rent is 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. ixtf,)uafaz r;4bl0xdm67, u The operating current is 1.0 A at full speed. What is the back u 67 xm flafx 40d)z;r,i,buta$emf$ 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 v6kkt). l.zlkq b2be fes:27eroltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in 3fjk9:o tvoq/o3.e ltthe secondary. How many turns are in the secondar 33kj.ftto :ol /e9voqy?

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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 primary if the 24+opq e0a-d 5k6(x/u phqpr7gneje ,f9 -V secondary has 100qdaox e(06+7 fpj 5n/,eur-9gpkqpeh 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 ajwo drl -;2rib 6;zx2l 500-turn primary coil and a 2000-turn secondary coil. If the current in theow xliz-62l;j bd 2;rr 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 9 ngoq-t-o2ktb4xrang- : /cr transformer. Assuming 100% efficiency, how many amps at 24 V can - :k9 roa-tonbcxrgnq -2tg4 /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 l8y /m2i1)zbb4;1;pv igccbv fnyr y6 neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates oncv6 p 1bf;l8vg;brmn/b4i iy zyyc)2 1 120 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 ond , heeugjt-ga09y5/ l its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltaehtu j ay5g/,g -0d9lege 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 on its primary coil and 300 turns on itsbk py sar; i7s,)f4r)drw0lj 3sur0voo(2 ml , secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in thesdr03)o)irr 4a,jlw;2kp0s sl v7y r(f,m bou 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 wfg.a: y+dpx f(e 9jj)has 200 turns. If the input current at the primary is 100 A, d pf+:e9.x) yfwaj gj(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 transfor0dmcurfx x u67i 0pd;5mer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sfud mx;r7pcu 650i d0xecondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20fvp9z o3 w6ra00 turns. If the power input to the primary ia3p90 orz vfw6s 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually st)sdrv2b py5; 4pqczht26 xh k.rc*. pjepped 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 has 20x2 bp rhqkp .jp;d.z2ch65cvy r)st*40 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 voltagjor1 d wjqhom b/.fm )w.4)cm+e is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmim. oo mfrq)1jww.jm d+b/)h4cssion line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppe;cptq4m zl wjh385 s8ed up to 4500 V by a transformer and transmitted through a powh5qesc z8t; 8wm l43pjer line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmissionix47tsx.u54 ym izmctt)5az42i mn lxi5 j,1q line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppe xi2xcmau,t4.q55tm5 s1y tnjzi 4lix)m47iz d up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long hask.6 pzr *vtv-k a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of tv6rkvzt* p-.k he 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. H2 h- eburca:x(ow much less power would be lost if the power were transmitted a( 2-x:a urbceht 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. 8f+s/ otfu8w2d w4q/um.kohu It is to be transmitted on a line with uh/2t+w 8.fuu sqkmo8ofw /4dresistance of 0.60 W. To what voltage must the generator 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 curren/5g- nfi(hpr it of 5.0 A. How much energy is stored in the coil's magnetic field/gni r5h i-fp(?

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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 inductor. What is tcy+ nqka5 *z75sza6yg his a5knzz g+6q a5sycy*7circuit'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 voltage isqnaea 32p8 au- ws4lpt46frc 7 120 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 pep9 ns+4z4d anxak 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 inndermt +5.fwo)k s:18ifw /u4v swxb2to a 120-V AC outlet. What is the resistance of the lamp noivw/t)f.brwx5 w2s: ud8 k+emf1s4?

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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 td :h+oe4z s.mbbp7p a8he peak current through obd 7pb+hms8a4e. :zpthe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powerd iqy lka4,gr (,ld)r/ supply. What is the power dissipated in the resistor(dlriqr, dl/ ya )4,gk?

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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 residn-xsg5g0gwjyu qxtn++ o5c 322a5ozstor 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-W3k dmsmv0+; nn resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is02i u ohm1o.fm $I = 0.80 \sin (240 t)$. 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+dqi2r2d(e.sywo 1s)n1 s,mtqzyrb / .0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a ly4f6zup1 oerc**9cf 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 inductive reacv 1wg(o it;t.hrc11ri tance?

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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 inducti nl7x:-,p8q y3gtns1*vgo ds lve 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 freqm4 .o2b: 9iyj-,v)myfu slbhxuency of 20 kHz is appliedi.4bum9m ,:2 ybh -syxjlf) ov 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 :r c3yo8tyr*jdue 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 capacp bad+4pn2c6ijeq* x/ itor 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 rlr(l8 ob3s yd8v/q+spn38 teW 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 W?kb)e k:jhf- 8(9rnt+x g odwfg-/ 8osgyuqk4.

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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 capaciti) ;dlm pw*08jn*eb9tdb8 eytmve reactance of a 0.010-mF capacitor be 100 W?byd8e*n8j)l* mt 9d;ep 0mbwt

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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 ca xa.fl0c )jzl1.hhs0w pacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac.a. zvx+i i1ee series circuit with 12.0 W resistance, 15.0 W inductive reactanz1ee+.iix.av ce, 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 resistor, yxst)5o54zed m f6na4 nrv01(nr igy* 20-mH coil, and 1.0-mF 5n4 5 xtai14r6)nrfmgv0*yzon( ysdecapacitor 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, 25w jc -0/hteoncar+1;t b4 smh0-mH coil, and 1.0-mF camwhcr;0- th sa+5n/o 4j 1ctebpacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what zyowe/m4jk7 ;q +k49(.e dubo2bakb fis the impedance at 10004.o (2jmd bbzw;yok4 e bf7/+u qaekk9 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 connec eabp;7:n ydxoj:,m8lted in series with a 20-mH inductor, what is the phase angle at 1jo, em7p ;bd:nl8:ayx 000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neede1 e b5mdippwie2 (/s7fd in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 150ipebp s2/7f1 emdwi5 (0 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 followingeu-d wu-l 6x0h capacitances is needed in series with a 100-W resistor andelh-du -06 xwu 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for ad 2i lsw xm()tg4lr0w0 total impedance of 40000 W?t wg)4r0(w ls0diml2x

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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 25p a r,foov/ta 100-kW resistor at 1.0-MHz for a total 25aot, fov /primpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a f bngm4l,ok-020-mF capacitor. What is the impedance at 10n b4f-kgolm, 000 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 kHz 1dhzf5s .:m ;+ gorzbxfor a total impedance ob+5shd:x rz;z . mogf1f 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 5ov6udfqc (cu kj) o/,* xv 2jy*b4ec1/ktqjqwith a 10-mF capacitor at 1.0 kHz for a phase angleq/x* vc426k,o(*ko c uet1/cf5vdy j)q u qjjb of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kiup 3mfyec5;h:xa9ttyok9 /- z *3ockHz for a totale3 o*ah/tkc:p k9ctyi;fmy-9ou z5 3x impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. e6vsp31em 4y9is w8dg What is the phase angle3y4 vs8 1 gsepmi69wde?

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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 coilb-n:8l nsss/ z, and 1.0-mF capacitor a/8zn ssn- bsl:re connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a mjr;tnoc+c nou3/mmp8nz9 8 + 0.350-H inductor. The circuit is connected to a 120-V, 60-+ rm z 89tcn/ np;mn3c+u8oomjHz 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 capacitog,nf 2 ookyvr0hk x)8*r of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are )*grf8 o,xn2 kvkyho0 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 adqe yqpai,x w22,; hzt)e+r: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 pox, :ahpq;izye2)d+w2ea qr t ,wer supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase ajoyp9l150 qw qm -n*frngle oom09l q51-* rwyfn pqjf $40^{\circ}$ 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 f sgt/x jn8).wirequency should the circuit be driven in order to have maximum power tra8xnw/ sgti.) jnsferred 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 a.:ga48pnx o3jozjm- , 15.0 W inductive reactance, and 10.0 zg.p8-m4n3ajaxo o : jW capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuir 4cz;5j)ahp yt 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 haml d-y8)r(ki+;qlpsz h2:dbos an impedance of 60 W and a resistance of 30 W. What is the pok lrldm8zdq2h:i-)by;p + s (ower 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 sedx p og3xgrg-zbb2/+*fh)zm 4 ries RLC circuit containing a 50-W resistor, a 10-mFxh/rfzb*2oxz d+ )gb4 g3pgm- capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequ;ul, f*lhpjju9:vyo 2ency of a 1.0-mF capacitor and a 15-mH coil in series?p2vh9*,oj uy ljulf:;

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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 capn4:2*rkk m-t7vj ziz9rai+o d acitor for a resonant frequency of 10kn7az42 *rjm-o:vitr di 9zk+ 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 resonan6 o:8ao3d q tce2ceuq1t frequency ooedq6 ca8u1oqec :t 23f 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be plap9sqh.iuxj:f678o 9qtb4tpu fja 8y (ced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circ6i:a9ffh q7p8u t .4jpbuyt x(s98 qjouit is to be 1000 Hz?

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