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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 magnebbg oo) wpbh.1kn( a4:tic 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 induce8p5+ye7 3zed6 exyrjtion states 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 a coil produces what kind of changem6 3fuih f0yi2niw *h5i s9l/a on t i/2lyfa i3shi u* fw6hm09ni5he 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 produceu9d6sy wh x4.ys what kind o.6u h9 4sxywdyf 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 loop of worl 3dgw +h-u-ire produces what kind of change on the induced 3+-log-r hwu d$emf$, 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 removed20/aur.yr vqg q5v6cz from 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 directizvy. ; w,*m6mvhc /zxeon of an induced current in a conductor will be that which tends to produce which of the following effexv* vz, emc/h.m6y;zw cts?

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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 abovmm:hqrc *a7c)e its center withc*h7:ca ) mrmq its north pole 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 horizontal table. A+ nyc24ht i+jd bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inducei4++th2 d cynjs (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 a3i:g s6;ddh,jeb:k n k. xlj1b table 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 thiib s3j jd:gb,;lndke1 x6.hk: s coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region buq(ql*xq5 bqqn/ 7)n where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed frnb5* qln q7q)xquq(/bom 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 fiey5xdgd.hok: 1: 9hv, )mmixfmld points straight down.fyv:o ) x1km5dim:, gh.x 9dhm The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing ae5/xn br9m4mj8j a:o current northr/ja5 xna89oej4m mb:ward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the northtduae 7 k4 mbf .7fk4p6dpcc59 pole entering first. As the north pole enters the wire, t 59kfp d uc.c b7fpek6744tmdahe induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spce udl4 q( mi/ohoe4pf/7m+q 1eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be to+qem7e(4uph/ 1 q4l/cf di mohe orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed aq0va v8syupnn. 1 26 l(6bghoabout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatio aubgqv yah8 61o2nn.6v0ls (pn 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.nik *pb )x/paj*a /3gg
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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 an do4f3c(42(s0zib2 g rqvgz+mrl xy p: $emf$ 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 magnetic0rdjfk7j3wgw, (s5 gl9eglw- 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 northward at conige-z9 , .2; -a3d4mezimyy ig hr)dytstant velocitmedm.iyyg23t yida)-z4igre z- ;h,9 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 ce2+i6x wwjlvh 4d31z 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 tm,i fcg,f.l e(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 revolutions each secondew w3w nj7e)/jcxebz gh+7iw ;sb50m). The frequency of txsjweb3eww77 );jc bi5 zeg)0+hwm/nhe $emf$ 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 devicej.i5q8sg: fwb 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 thimz7g*kar.f dn+k (g:y0 nnpig 192lvat

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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 containab z26reo7g d9s more loops than the primary coil then o97zreba2 6gd 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 secon/lso.b dj,5 ipdary coil then /ob dji5, s.plit 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 powe7d y9ol9ump m8r 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 resonanth4n z n;/c1b7 0gsbl jp*,wtxe circuit,

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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 inducxrk hl d kw..z12nm8nj+)7uedtor are connected in series to an ideal battery of constant terminzwkm 7l)h.+1xnrd2. d kuj n8eal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are co/*(nqe bc6 lrh3mg; spnnected in series to an ideal battery of constant terminal voltage. At r /p6(qme *cnhg;s3lb 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 cr1f7q zvd6 *yL 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 inductal(ws4ur 4o7p+x0tx u cnce 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 indu/vnqdz i3t 89n.ttgh3ctor are connected in series to a battery. The time constant for the circuit represents the time required for the current3 i9 qgdt3thnztn v/.8 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 induc rd)pnl/(mbk* tor are connected in series to a battery. The battery is suddenly removed from the circuit. Th)/ bkmnp(rld* e time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uni w03zux. y,pnxts 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 supp(u s*0)v6zleym0kl b oly. 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 supplytuh fv+ eecde;2h-24q. In this circuit, the currenh22+;e d-fhutcvqe 4et

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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 chane3.tzxukvv vg-mv w:1*cqb(7ges by what factor when the frequency is tripl7vueqz1m*(xc w-k v gt3vv:.bed?

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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, tsr x0 ;+ghlk0fhe inductive reactanc+sxkrh ;f g00le 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 ind.atne a-nh9:guctor approaches zero, the inductte -a9hnng .a:ive 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 thad3h rz xg.2kl7xg/ r*is circuit, the curre*lga7x .rdhk3rz2/ gxnt

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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 rfzu))m+ccpp fi)2/ ywhat factor when the frequency is+f f2p)))ipcr/ zyumc 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 a capacitorm1y j1 e/c.m2uc j 9v*mks;jqqpxs6x x1-/g ko approaches zero, the capacitive r v/xx/qoj.2j1;y1ss cj 1* cekg 9-qkuxmm 6mpeactance 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 betwehxa 3n193 xiofen the voltages of the inductor and capacitor in a RLC seri h 39xinao31fxes 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 circuiauj md:g4/ fm,t 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. The impedance of the circuit increasesaq(jcs )4q(z1 8n yevf 8e:ext if R increases. When is thin tqxs) (e(ev88y:qfe cz ja41s 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 impeda5 6do5y-k5ymiztmmg .nce 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. p-8tis 5a- 5cs qf00txa1q gdg The impedance 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 tppf/tlcf 8d.cr33 c t*he capacitance both double in an LRC series circuit, the resonant ffltd *p3c3f. c/p ctr8requency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circ 2u yecew5)hk*uit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC ciwrnn2r6x g tr1 (gr91nrcuit 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 0.12jj3 m /l17w e/hmyelz0 m is rotating in a uniform magnetic field of 0.20 T. jz1 w mmh lelyj37/e2/Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifor/k )wx,k,zcv )e,lntd m magnetic field of 0.20 T. Find the magnet/ lw ) kckd,x,vz)e,tnic 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 0.10 m is rotating in a uniform magnetic field ofmvuy4+kcdh h0 1bo no(p-17tcc 4wc 8f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn 1yc7cc0u1 mo(tkpb+v44 whn d8oc-hfetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single ltrvs* / ysj.-cb3kkd4v:*crd uyz5 p(oop 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 chang;j; h esmywza6/u,wytp ou/3 0es 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 om97ry ro 0g /(um7lqeogv b.q6f wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If themr ovq9 goqm.r7l7e0b6(uy /g field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turnb9 ugtdn1mp mn3k*u6 om. ;ypo/ft0 qdfh7t0 8s 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 area /c/ hrwm)q2 pw (pyom)$0.20 \; m^{2}$ 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 spaj io9e3y9di.va j l ykv.8nh50n of 60 m flies horizontally at a location where the downward component of the Earth's magnetic 0 3iolaj8yvjd yivk .e.9 h9n5field 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 angular w,*/ ciiiq0 1.vev;hdkm ax 7kvelocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magne qd hex*i m.;7kw i,vca1v/0iktic 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 bjdk :-rc9/ ,k ,ujsdma cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of w1.gj2nkrvq9 3bhep9 ;g gsp9c(u7 stvire 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 on its armature. Each loop is 12 c1ktx 2yed*wxqblf a6p :u:)2x m 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 voltagk 22u:16 xxf:xdle)a*qbw type of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns .,nifn,b cs w bi*b b5z*:px:eof 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 2stv )oqux+7ai 2d,vyAC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 vo tud)i7 qx 22s,v+ayT 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 wia+u*4qi hr- 8gv/ ahhtth 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 j 9lq(end47mv hkt ,2 q)fm95ypr jj+qmotor 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 a7uobs8r;m8z3 bfb gcq ,-oxyp-*x +hx resistance of 6.00 W. The motor operates on 120 V AC, and when running at fux8rg8o b;q *x upcy s,mx -bh+ozb7-3fll speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Th6q zahm,nis/u,jg93k )c wxb( e operating current is 1.0 Azc,9gkx mbw h/ sai3,nuj (q6). 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 connecq q35jdnzk7y (w cv0z1nsli-*:k u3fited to a 24-V power supply. The operating current is 1.0 A at fullz-fwj1 qnyl7 :3i c3sk(zd0v niqk*5 u 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 6.0xf1 -/;q(ijaa(dsbtkt: hq n : W is connected to a 24-V power supply. The operating curnasi;k tqbx/1-f aj(d t:h :q(rent 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 reduco j tzq7glw8va3f .p,0e a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tran bv(rt rd fh z9::6od7xg+lc2csformer causes 14 A to flow in the secondary. How many turns ar(d+2t:zhlc :7xrfcgo 96r vbde 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 necessa.dvk kkm0n5cg+5 lg.a ry in a 110-V primary if the 24-V secondary has 100 d50.gnv+g5ka .kmclkturns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consista4i;// sglh0z)et8 kq7iiqy o s of a 500-turn primary coil and a 2000-turn secondary coil. If the current isi);0z4li7kyeq 8t/aq / hgoin 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 prd17q5xc by-*fqqv0 ygimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the se 1y-yf0x qbgvcq7dq5 *condary?

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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 neonve+s ),mkwf0d*cbf xr4:glb1v.f9 d8;xicgz sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What)1fx f rflv;d984z cs+wi:gg.em b,xb0v *dck 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 ture:m4b ofxc +.kul*ucy2w76 ft/6cxl wns on its primary coil and 300 turns on its secondary coiw76yue 2u oc m6c.lbkx *:4 f/c+lwtfxl. If 120 V at 2.0 A is applied 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 9a:tnqhgwz.ksa)0f ; 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 in f)g kqsawz;.0t n9a h: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 its1155+6 olvrlncinesx secondary has 200 turns. If the input curr 6sn5ce+i1 vr15lxonl ent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its se: wu(zcxkg+oywj(ho*4 2j:e rcondary has 200 turns. If the input voltage to the primak g (wy+jer24x:*wj cu(:zoohry 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 transfo1e9tjoe( (y kfrmer has 100 turns and its secondary has 200 turns. If the powertk( joye91e(f input to the primary is 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. T,(*jk9;rtne c1qsn wihe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1. i* (wtn1jeqknc;r,9s0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120gt2f0 qv+zd0 zh.i/0;kujz3kr(ja wn V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power vfuti( z+zd g./3 nk 0z0q2w;karj0jh lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltag (oit5ugz 6vn3e is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not steppedov i n5guz6t(3 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 resistaaz2 :i1k5/vw4so wwoo nce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original ei2 wzwok4:o1avws o/5nergy 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 qt94qxw loh aj5z)dyx 8o2e 5150 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 stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the tt)q 1y odoj4wz hex2xql958a5ransformer 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 l)a y,df .ae,q*rtvm o*ess power would be lost if the power were transmitted at 30,vamo* ) ,qaydet *fr.00 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 .+hm)ztz mwm(-q. gm(c6p jcl to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power lom +(.zhm. cw q6zcgmp)jt-(lmss 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 is3i.*th e)v /; fgpo( 4bgylfnq stored in the coil's mag*ngbl)fhtf/ 3qvyo 4pi;e. (gnetic field?

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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 containsm2yi6o8 ; u(rqn0d ntf a 6.0-W resistor and an 18-H inductor. What is this circuit's time f2o t6nd(iqm8u 0;nryconstant?

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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 volt.lbw e/q+z* xv0l0howage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed in . 46ent nz6zkpunu/nf9mj(r9to a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the7atm(q hs ht51u pi1(i resistance of the lamp?1h(5s(1ah p 7uiqimtt

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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 p;;fu *iofnwc ;jel7ypu 6*/twh*pct 2 ower supply. What is the peak current through the resistoy6 fu*2th pwcln / ; jftu*e;7op;ciw*r?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dissqehue po) .4eybj d0a-qd045k ipated in the resieqa-)bhd0e.4p u 4kd0yej5 oqstor?

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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 is ,al jd)o -n kxsz7nep87en b:($I = 0.80 \sin (240 t)$. 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 resi n +de.(jn;shfstor 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 ish:ytvx+t;38ar0 czaaizn .( n $I = 0.80 \sin (240 t)$. 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 **gpiz /0i yysof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil ap. 5 dg ;ncjyu fw5;hx-n2ej7bt 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 induct pno.oxq (s*htplr49hr7 bs/7ive 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 Hb4y6l 9l itul-bv;fr p3t-j5pnxb- u8z?

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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 freque2q lg qyh/ cwkfso6ge:21y /t5ncy of 20 kHz is appliedqq / hs f6ke /5wyc:t21gl2goy 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 zqeu ,q1x-1x ipf+ qx)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 reactt x+ ,4f7q: lh,1j ky-zgctfoyance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive ,bs-z7bw,/n2ej vmb j.(ao pnreactance 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 1;z)d 4xxandqp6u g h)em,y 6f1200 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 sh /8ltn,lxlp1v6, ix7zb8d bcapacitive reactance of a 0.010-mF capacitor be 100 W?lhn6pxz8,il lb,db 81 sx /7vt

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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 hbe.8cmb5-bv a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15u xo8q-6pg 5ev.0 W inductive reactance, and 10.o8v gx -eq5p6u0 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 )imj4:rxne x(/vn o9f Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are/ex(:o 9 nj)rvfxi4mn 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 ang/-cp s a 4bkzz3lw2v(ile at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seziz wk-(cpl /3b42vs aries?

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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 i:a3araw3-ll p o5.ol l.ui rg8n series with a 20-mH inductor, what is the impedance 35 ulir3l g8ol pwlaao .-r.:aat 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 connectaa(- cuf ()xwsed in series with a 20-mH inductor, what is the phase angle at 1000 Hzc(w sx )aa-fu(?

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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 alv4hbmq i8 3u: *jv,evnd 1.0-mF capacitor for a total impedance8 4,hblj: qevm*ivv 3u 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 need u )0 ke:tu7wg8+fbaijed in series with a 100-W resistor and 15-mH coil to get a total impedance of 1 igu w ab0j:fktue87)+10 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-mHi-o3 njdwg94 f inductor at 5000 Hz for a total impedancdwg4 jf3i-9 one 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 seriesd.3 z0u qj 9o-cgz0len with a 100-kW resistor at 1.0-MHz for a tot ncu do-qj09z0z3g.elal 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 serie8c rnfm6f /;k1gbm es4s with a 20-mF capacitor. What is the impedance at 1se mg;/1bmcf8r4fn 6k000 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 ahqud 7hn3-*t 4 siys0zc5 qrv3t 1.0 kHz for a total impedance of 45qu0 z qr5i3 yhsd n-*ctv47sh3 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 1x;a34b)qm+ an ijmpuseries with a 10-mF capacitor at 1.0 kHz for a phase ap;nqi 3a4 m j)um1a+bxngle 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 kHz foycg +.3d1gt* 3oqpvlk r a total impedant vp3 o.dgly +g3c1qk*ce 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 i-pjk- ,*ucx dun series with a 100-mF capacitor at 120 Hz. What is the phase - puk-u*dj cx,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 iow2d10slhs*cav2)apnj; 1 u if a 100-W resistor, 20-mH coil, and 1.0a0sd 1s1cpla2h)w*nj;o viu 2 -mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resisto8kc3o t+q ey.dr, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in 3 cto+ y.qedk8the 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 cur.2+ at ,vh;xa kg:fgapacitive reactance 30 W, and an inductor of inductive reaafug g;+,x2a r :kh.vtctance 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 resistor,,dkxitajpq wmbr9 -:) at8 4*m)sl5 lx a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply)pmit-:9b4l adwj mxalxt 5 r*k8)q s,?

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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+(ya/ *evz lqp gliv59p5g8ri 500-W resistor for a phase angle o*i( lrp+59/iq58ale vgzvyg pf $40^{\circ}$ 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 = 10.0jeh:odmd /o (y8g 6;kbonk-e; mF. At what frequency sh6;n: 8o ( kg/k e-dbohd;oyjmeould the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0d.3:a 8kjf)tv cm2 mzzmd/u 2h W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecjk ) ddzch t2:/vz8u.amf2mm3ted 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 cie2lda,q kmfkb4 77 gw)rcuit 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 ai81xwi v/nno;um +f; a resistance of 30 W. What is the powe/xi vo;wum +ia f81nn;r 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 cir3r rwm5.h q9x 8bzu xjy:u**wrls/mh)cuit containing a 50-W resistor, a 10-mF capac.:xzu)hlr *3x m8w 5br humrys*qj9/witor, 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 frequency of av(;gapibob1b32 / d ix 1.0-mF capacitor and a 15-mH coil in series?/b1xb3ii2dvb ;oa (pg

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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 s ui-zy:9tjwk dr/0z5oq8 w 1ogeries with a 4.7-mF capacitor for a resonant frequ- o/kr y1:wiozg85j d t0wz9uqency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductobd+i xvy+(hdu- 4yteh,c (2lmr for a resonant frequency of 10dy hvx(cm++,bi edyt h-l24(u 00 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 a 30-W rwf 5vstb6/c1zu:zu,v-eh.hq4onq.7 h xpfs 3esistor and a 40-mH coil if the resonath6cf3s.xuz f57 -qwv4zneb h hvu/q,.s1p :ont frequency of the circuit is to be 1000 Hz?

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