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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are b:-jzs5 9kcu gunits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stan,y qov 77f0hotes 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 i+ tiy8z4syq,-mev5; tzf 7mdkn a coil produces what kind of change on the induzz;ys7,f v8m dm+e- qittyk45ced $emf$, 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 loopcw acd9yxup708e n kt3nm-.5 z of wire produces what kind of .cnu n -etmk7 cx8y5p90dw a3zchange 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 whs7l ux0og1 1cnat kind of change on the induced 1ncg7u1 xslo0 $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnexiu(v.l0dp a /tic 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 conductor w) 5:gx4ytqf pr k9n5w/ny4tre ill be that which tends to produce which of the following effe 5fx9/g5tke n)4qpwnt yy: r4rcts?

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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 tab9 gc( b:ka cvmhg(yu3/le. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inducesayccm 3gg(b: vk/9( hu (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 8ypquh lx+iwt.q; hbu(*t+ 88n egg7n. A bar magnet is held above its center with itq*ttl8nh(+ixn ; 8gqpyubu gwe h7+.8s 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 in a region where the magnetic field vect0gu,f .l/ygr dor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fgrl .,u/fg0y dield 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 where the k - 1b t sp2x-fvf9cgi,0h9i9k(ysae sqq;x1umagnetic field vector points straight up. The magnetic field suddgf1sqyskv 1- qx9kxu0e(bi9 29 ita-fp;s ,chenly 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 the magneoml8.-z) 3uuy k f/ihatic field points straight la fz/y3u8ohu-i m.)kdown. 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 table29l v 8a6f8jsidhw e9c1oo2eg and carries an ever-increasing current northward. Two coils of wire lie flat o86ofv9dw29 c1ijeh 8g leaso 2n 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 opmr 8lilt :11of wire with the north pole entering first. As the north pole enters the wire, the induced current will be:orm 18ltli1p (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 cons-g:c(z)knj) gm57 ydjl asrm1tant 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 rotaty)al: nskzj g)m rcdm75-g1(jion 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 rot,po1yz5 .lbsgated 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 thszl 1,g.o5ypbe 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.s7 wnmrvd0o46
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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 anoczk-l3 c+ -hz $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Tkpq ak; 4qbp637.hm zohe $emf$ 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 mp.6 bwc8*vm u3-sh mwik2k,jeast-west direction) is moved northward at constant velocity through a magnetic field that points strai m .sww-6 mk3upbci*k 2jm8,vhght 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 vevk*l-dnei1:c1/ bdktlocity $\omega$ 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 ttawv 8ed;)lvhs6xz ghi8 4g 70ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of thlb w5.a45.h1:xoukcov6 p, l:ytyfohe bt5.xu.k1 l6h wol ,afoy oy5vp4h c::$emf$ 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 tokr;57o d.myp, j*sqbc

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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 dev,x)8k7r f n2r xhy-rvlice 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 contat0nx/;einh nr5++k d6lyeij( ins more loops than the primary coil5 +tx(+r jekndi/hi;l yn e0n6 then 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 seconda3htl- -/awut fry coil then it is a t- u3-/tafwlh

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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 pp6+he eea(-y9zor-0s,7 sc+i vgrcl 4-kgdnw ower 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 circuiju8 -ieni,x *kt,

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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 inqjw w6xv(18b w9 sq/ ;geecd5fductor are connected in series to an ideal battery of constant terminal vol81gx q6;vd sf5w9wc q(/eejbwtage. 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 connected in series to an ideal rp5m-l 5kp85doe tno; battery of constant terminal voltage. At the moment contact is made witp 5r 8ldk-t ;mepo5on5h 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 resistanwgvzdtyy7y:/rnr 9 )2ce 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 ry am9kmqq4)w 86.d94yv5o m0ih bivneesistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batterd)-xq yb4/yo ky. The time constant for the circuit represents the time required foqdby4/ xy )k-or 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. Them zq4958iugmr battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fomm r549qz8ug ir 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 68ejdr q/.td5r pcfe8lb468* kb qfoohave 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 power supply. On this circuio8) ) +*zxgd(z inighrt, 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 App8la0i) z/shC power supply. In this circuit, the currenal0) z8s/ ihppt

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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 t-f:rv8nbv)a,5nus t(c t7 keihe frequency is c()f785-t:n art vk,u nb evistripled?

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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 doncwr25 d4uop i irx yfeio7 30/ge:t8:ubled, the inductive reactance of tha/8p dn34ox:i 20wrr iytef5o7c:ui get 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 ine1 lfqemaj(ly)gx. * +ductor approaches zero, the inductive reactance l*)yjm fe(x.g1a e+lqof 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. i 9sc uvdfe vqc7;2f1jgmlf :2z.(y5t In this circuit, the currentmyzu1 fvt ;j:d(s9vcigec 2q27.f lf5

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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 circ/q d hzn0e vr c7)qmyuyw0*)r-k8d.x auit changes by what factor when the frequema 7ckrh*y.)dn0dwqz0yx-r)vue8 /q ncy is 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 capacitor approaches zero, h2r:e u7dhu1. hkn,zsthe capacitive reactance o,h2rnu. zs ku7hd: 1hef 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 +mp:d.. 0hz2gp i, jc c2kbvrjvoltages of the inductor and capacitor in a RLC series circuibi c+, dh0 pmvgjc2z.2rp:.j kt?

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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 c,ao /n /kgwm*iircuit 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 increases0 .s )tuclm/ss if R increases. When is this statemm u)0/s cstl.sent 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 impedancie6co+ )u54(xukch 8fable ;ye of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cphym34a*h9 qsg8 7kdz ircuit 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 LRC seriesmoyz8/,xvzv 4owa9 ch 9f* h0e circuit, the resonant frequency of that circuit w*e4zo0/f, vzmax 89hh9wyoc vill

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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 1(l p.mvr(jmlnance,

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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 RLCbgy6r -a6 nfaqoe2lxwb0g.. qnw0(z * circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0i 5wpqe7 jl1k-.20 T. Find the magn lqjp5-kei7w1 etic 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 unifo /;sqc ouy136mq .qkh(ljl(k grm magnetic field of 0.20 T. Find the magnetic flux through the loop whq1(l os(.ck ;/63 qmqjugl kyhen 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 ma7 t5vlbq+no9,aj5dx c cvy4*hgnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti vy 9ql +cnh*xcd7bj4v,5t5oac 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 loop is reduce4 b-0 3dm nblwxbkt2 6:0ipqqpd 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 cha m+ h-o* q5pdwhs737hpyc6m awnges 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 awcto q13ncr84e 8+xiq square frame with sides 18 cm. A uniform magnetic fcn3eiwc4o rxqt+ 8q18 ield is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15/iij*3g,x plxkz8l*m 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 an y( vjq/bfmmcv2c0+q8d 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 locatioeg l*: 74/djzymzs ptp ++:mudn where the downward componentug7jdm /e +psyz:pld4* +:zt m 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 rota ux)eb n (3*ye ex3lhpn5.2kqftes at a constant angular velocity of 2.0 rad/s abou y ef.nk5 3)hnbe2leqx*ux3p(t a vertical axis through 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 wt j(fh.wufo8fkg5 m e( j6x..and a 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 turnsj/cq -ea b,bl9 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 on- m9a.e6p ghkw 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 og p6mwhka-. 9eutput 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 conso11l6/ )uuahc;5jkj re ocof*ists 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 :*bprpml)/b hof 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. b)bp /*ml rh:pIf 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 gena/ 4hi *e ciir)ue)x/urbxi:6erator 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 ret3fv(fdmbe2wzy8k 6avzw ; /,sistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ope/xxr un5eg5)nrates on 120 V AC, and when running at full speed it generates a g)nn5r 5e /xxuback $emf$ 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 r (sm7// if xpyzr;gubj5,g) ris connected to a 24-V power supply. The operating current is 1.0 A. What is t; jx7,r p5/ysrr)mz/ f( buggihe start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-Vj mzr;u b+7spr.et/0u power supply. The operating current is 1.0 A at full speed. What is the babpu . esm;+z0t rjru7/ck $emf$ 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 2ii 1d (rvov0o+8dyfj to a 24-V power supply. The operating curreo jii+0d21rf(ov vd8ynt is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage of .*,fa+;kwjp o),cbpc d tgnc+$120 \; V$ 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 the seco6c9 p5d ,5xu*lg0*kc *vbnn2 bsq ixivndary. How many tuq6iibsu5 dn v2*cxcl0 9vn*pk*xb,5grns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a; 0qgpak mj,cgsj3 u5,n84 ir) zo+yaz 110-V primary if the 24-V secondz0zj,og;i+sqkunmg8 ap5) cy4j3r,a ary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and agb d.elp)/9a/py a ad, 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cu.)b,aea lyg 9p/ dad/prrent 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 primar,n/930j.ezz7djl ovhq,nx i dy of a transformer. Assuming 100% efficiency, how many a3vo nj/zz. qdjhn 0i,x,le9d7 mps 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 transformer provides 7500 V ax6 jqmfa69qei5t km24 -2lck ot 10.0 mA. The primary coil operates on 1209liex ca2kq 2m66tfk5q -om4j 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 coirlk8cj:phb y1z(j wpd8: yhd6 rh757tl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage ypj8t7 8hcdwhl7k zy r(jh5:pd :16br 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 coild qt1 w+2cyg7 *qu44odzd szh1 and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prima14qc +dtqgzd4oz12 *7dhu swyry, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turz ve-0rlt 6nbl6; +wffns. If the input current at the ef6- rw nb6;ltz0v+f lprimary 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 secondary has 200 turns. ec 2(lzwzp)whl o1.)l If the input volta2o1hz zwl( wl)pe.)c lge to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and it;+w5ev w.p57kgnii q os secondary has 200 turns. If the pownv.e w 5k7q+p g5;oiiwer 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 curr2cjvr,kj 3nrn rf9ce-q8n* +uent 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 turns in the secondary if the pr9 e+n n*vjrrq-cufn k3,8j2c rimary 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 6o.dxl9 lba9e0mi0m jA 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 percentage power lost i.9mjxalbi 0dlm9o 60e n 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 voltage is usually steppev+ evjf4 c3p599/ct 7oni iseid 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 voli 9io7 /+cv53cji4etvfp se9ntage 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 )urjr9vq ,no2 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 stepped up with a tranjq), rov9nr u2sformer 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 6- o 5mua, ( vlki/pi(zcm*gziline 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 stepped up with a transformer with a turns ratio of 100:1. What percentage of the original e(/opic m65iz(-u m,zi *alvgknergy 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 transmittecsw.cery4 n tq*,w6,ed down a 6-W line at 1000 V. How much less power would be lost if the p,st,rcey e nw.q4w*c 6ower 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 ioda 7,43 uw,bd xq2vpls 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be swdupxadbl2 ov q,4 ,37tepped 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 stored in the tz xr.he7-;ebv xucm+7o w8 ,icoil's mw+;vxbo7.rze8-x hic,7mt eu agnetic 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 contains a 6 8iho- u.i2/-/rzsxnwad7g bd .0-W resistor and an 18-H inductor. What is this circuit'g2--b ohzwd/s x.nai7/r i 8uds 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 rmh* ,pu +o, 4vgyxk9vfmvk4,kms 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-t9fhy 0q9ej6wy i 1kl3V 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 the resrm.6 o,c7 *myrdpv xq*istance of the la*6.,o7drmr xcvm q*ypmp?

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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-Vyxhu 92c /sqptj;wf 7eey:,8u ac power supply. What is the peak current throuxy,s j7e8uw;et:ucyf / 9pq2hgh 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 connecog x qfu3*9+adted to a 120-V ac power supply. What is the power dissipated in the resiqdx3 + aoug9*fstor?

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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 resistobesr 7 2e:rsm3r 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 50k3s,2c108fn+gro b bnhoi.oj -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 a 50-W resist4y5x0u wgpv3ht b/fu .or 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 reactancej0ra 9p hlv1c6 of 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 2.50nbx53 5he e-ilgr 8hw)-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 reactance?,gl;kdf8/ng qyi 1o g*

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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 c;z y( n)pbca-of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 2b:0885c ltomkvnf0s-c3 tz8e slwu f.0 kHz is applied to it?:ks 0fc v-fnbet0 m l.8cs3wuzt5l88o

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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 do bv/(4fp8xw through a 2.50-mH 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 reactwkf ;5(lc7 uax4ub :ftance 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 2 r*x)y 5yhsj,b 9zlazis needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance *wwl a xxhf.+nm(7buy+ pm 7x5of 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 capacitiveygq7 c0cks4 v-1-j jez+omed7 reactance of a 0.010-mF capacitor be 100 W?v e-4csoj-j0dem7 1y+kg 7zcq

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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 capacit .qbo3m ;s( jlo0u :wq2*btcdnor 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, 1; 2sz+db1z 0vb4sem*ez:1qs- lo(pndf.xzw f5.0 W inductive reactance, and 10.0 W v+ m10.ez-fzsp b nxw sz f*(bd:;el1oz4qs2dcapacitive 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 ut/t,d-diixmqio 0(*j ;g) hcat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co ;odt,idmq)tcu0gxhj/* (i-i nnected 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,ce5z z nw4pe)b-:wil-mH coil, and 1.0-mF capacitor are connecte iew)z4:5 c w,lepbn-zd 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-p)op +2uy0ky amH inductor, what is the impeda)2+y0au pypkonce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wit z ;h/-mjii9tqvn* j ;vvp.qn9h a 20-mH inductor, what is the phase angle at 100vi-;;z.pqqn/j9m iv9vhj *tn0 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0j8-vipu fd92 1pfmi+n-mF capacitor for a total impedance of 100 W atifpp8+ mvjud-19i 2fn 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 capacam42m s tqg 7j8+kliz5k, ,jzyitances is needed in series with a 100-W resistor and 15-mH coil to get a total78 +km5 24ytk liajzqz,gmjs , 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)2/fkg1+w ;*nnxzaffw 1drx w 5000 Hz for a tot 1)x r n+gzw*wffnd21axw k;/fal 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 with a 100-kW ull:- oa8 i(idresistor at 1.0-MHz for a total imped8adoiu:( i l-lance 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 20-mF capacitor. What is the imxjrwm... dm8 lpedance at 1000..w xjd mlm.r8 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 for a t6r znsc/re)8 total iz)n / sctr6e8rmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor achov zh/,ubql12,-ept 1.0 kHz for a phase anepl /b1q,u2v hcoh,z-gle 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 neededc2crv*x77d br7c* cvk+wxt j 8 in series with a 30-W resistor at 1.0 kHz for a totalx*ckc77cbcv8jr +xt vd7r2w* 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-mfimn eg7 -*l 100-mF capacitor at 120 Hz. What is the phase angle -ml7ieng* -mf?

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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 resi y-(uf.xd6kvl azs1h6stor, 20-mH coil, and 1.0-m. 1h-dz 6xv( lf6kausyF 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 resistor, a 10.0-mF c (4z;q lin2rv:tw0wiw apacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circu z;nl0wt(2iqv:r 4wwi it?

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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 reactance 30 W, and an ind+nir 4pzjh s+gvw8z88uctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz pgs 8rjh48+zzipvw +n8ower 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 RLCrf6y xzd2p+c * circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe6ypx+rdf zc*2 n connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series w*x 5 jtvs:pv9fith a 500-W resistor for a phase angle of fvjp*: v5t9xs$40^{\circ}$ 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:y3q9 grzoza , W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the d 3a9q:o gz,yzrriving 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 w crbezn d/kus/kca( ;; *a*:qcith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12/ck :qk*az*r ad/e(;uc cns b;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 A ozu ccj*(6xy(j3/ 9jvc87pbfjg:p nsC circuit 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 rea8k+gv6d 9l . z n* vuh3-izg.lyg/ nh,p4yxjbsistance of 30 W. What is the power factor?a.4vgibx3yph-lzn .,u*9jgd8l 6v/g hk+yn z

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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 b02t7co9- d xymb9mq:ud m:z ga series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when 9qmb m9g m: 0ubyoc:z-7td2xd 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 a7e;g4 qc* +amyat(c0u k+mtirqi e13c 1.0-mF capacitor and a 15-mH coil in series?;(a+u7qi eq 0+g *t k3etca1mymiccr4

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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 ik+n)h0 8qeitm b3 mn(sn series with a 4.7-mF capacitor for a resonant frequency)ehis8+n (qnk0mm b 3t 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 induhx1bm *;0l qx; gbvu-mctor for a resonant frequencyxlv*x u -mbg1q 0bm;;h of 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 placed8*tthxy 2(len in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit i28e txytnh* (ls to be 1000 Hz?

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