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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 units of magnetic f4;oxsj vi76lbx +7erd lux 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,k*w*.opyv;6( gc vlsj /atof 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;.tce.noj4 klk r-tr+qy8)xh kind of change on t4l8)kcqrre- t+.xoj y;h.ktn he induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field throug+/ xk lfuc(4w8+zc2ylt56kjcx sv )njh a loop of wire produces what kind of ch2jc+k w8)tc +fs6 n(c/jxzx5yu4v kl lange 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 what9tt0p xtc nj0. kind of change on the inducedtxt9j0 t c.n0p $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an om4ve2 d 4q9as$emf$ 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 ippic2. 6b07i dgp awd0yyg 3s-n a conductor will be t-diib0 d cyy.wspg273 0pga6phat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is he oso42n:t2.kev uqc5kld above its center with its north pole poinvou2.:2t k5 keqnoc s4ting 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 bar magnet is held above itb2/ nuo3czxf u 9 8z*8nl1w4rzoj8a i2n8sihss center with its north pole pointing donx/9s 8ro*o8s4ai8u3zi b nj2l zw nc2uz8h1 fwn, 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 n5 h i.9 avwb m;ddx/joq/(by,field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field d9;hxmioy5 (bq. vj w,/bna/dfades?

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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 magnetic field vect4;9; 0yn ug ti-n 4z+zccvf*pdvtl5mjor points straight up. The magnetic field sudden;d*5l cn tm9i-gtvvj0;up4zzn 4+cf yly 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 whp43a ro hz0pqa owz55;ere the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced c5a4;aq z wh oz5o3rp0purrent 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 andpyrd (50p77 hf-dul hq carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currenquh 0d5 7-rlfphdp7( yt 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 throk30a/ 7b ewagcsn(ea.n :v .dmugh a loop of wire with the north pole entering first. As tbvak3c mawaen: sg( .nde. 70/he north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed ab3 d4tmb lfk7+ycbh m 3fogl/,:out 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 ax/ b7byk3homfclm,3 ld: f+4gtis 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 aboulje50iifs a uh;1+c ru lj3g1.t an axis whose direction can be varcj;lia+il 0s3f1he . 5grju u1ied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.qb o77)yrv*)sscr1q fb3 jsx7,iua2 o
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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 thatid(i. t kw. 85tzc ifc9a f3n3o (64heusn*ozx an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. 1n wp jcf;ueia3500w m-cqk 4w 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-zytkig6j3 e 7i480daj:/vvny- :kmwqwest direction) is moved northward at constant velocity through a magnetic field that poij4i t ka:kg8w/:iyy0 jzm3 vde7 -n6qvnts 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 -x.lb3sjf/fx 0pbng7$\omega$ 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 tc ncomcf/ 9 xc,fts)8jp(r(d1 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 revolutionswjn( 9 o8gi*lny9g4d;b l)rjd each second. The frequency of the(g4*l bg 9y8n;lddi j)jor 9nw $emf$ 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 odey.r pbi- ;xeqso0)0p (1wvused 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 de )irlpnv7nv+-rfd gt0(j vu;; ,k m,ghvice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more /dp7aq k4 zfig.v p7(oloops than the primary coil theadp.v /ki74g(pz 7foqn 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 secondary coiam2 5szfsf-;5p,hjyn 6bv;om.i xo 7gl th-igjsn; x,p;62smb.v o hm55foa7yf zen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp9u91vdsy 4o wlut

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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 ci7r,cv4rk2 zn+qcjj b2zv n 7p-rcuit,

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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 conne:nerj+;h cng 7cted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosheg:+;7cjn rns 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 inductd6qs*bhjty*s x hx65 ;ry9re: or are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with :r9rt 5h e6d*6yy ;qjh*xs xbsthe 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 induc k3(nq aw;o n xbwd06bs* ;3tntbb7iq6tance 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 inductm6ojinse f*k(x5q4,kf94/d jty t*ky ance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time consa4n234/v iao k m/bidmtant for the circuit represents the time required for the current to reach daib/m4 i4m 3vk2na/o

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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 arepwz07. -tw1ysq jz,uykz9av 8 ,o 1baq connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit repre1wwy9q,-a z.oj1,vs7puz yt zb08qak sents 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 hcdh1slvy 3 aenh;x7wn 2+b :v8ave 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 circuit,6um czc mjj 8jr4,x/p8 the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, w(n e czr1 0pxyi:8a)wthe currentc wnx:pz 1(rw)0eiy 8a

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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 k5;jds elf9 .ycircuit changes by what factor when the frequency is tripls.;ek5 dlj9yf 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 voltage across an inductor is doub/ h4gx jysuxcg;6kt2*led, the inductive reacta; 42k*t uxjg /x6hygcsnce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaildf,*-on jlwwc q7//n j v97yches zero, the inductive reactance of thyn //iv-*cf 7d,ll9qjn7wojw at 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 sup+7bvvlm( cux775c)e f+ i heonply. In this circuit, the current+ uo7hc7ec (xb iv5)f7melnv+

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance r ma1g(phe1zlvl0v 76-x4n p vin an ac circuit changes by what factor when the frequency is tripledh-vav0n7zl e g 1v (x46pp1lrm?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cl3qtw y 2-ia6bapacitive reac3y2la w-bi q6ttance 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 indbjugs93xco qk i5z:7y*j a/( euctor and capacitor in a RLC series zibq/ga: exk (uyo7 395*jscjcircuit?

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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 defim ; n3ftlw3jg;ned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increae hbgbv-s5/z3 ses. Whev 5bs3/ge-hzb n is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases :fm sz c**vt4thy.,. ptj lk4oql sb4e39hs, oif $X_L$ 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 circui9ny 5qkmth31w rk ,si(t. 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 the capacitance both double in an LRC series circuitn3kv33,tu 3qa:e 9tgmr mjjr8, the resonant frequency of that mt3kq33 e3mr rjva:gt,n8ju9circuit 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 drivwdfk cy* x4. v+he-dj3en 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 circlf,b u z:* ))yctfuhb,uit 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 radtog udzcz6 ,-6ius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop , zc-t d6uz6ogwhen 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 8-1dqs6po frn 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 field vector are perpendicul6qd8o -1fsnrpar.

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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 ra0:ld.a(:t qtfms g ot*dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the ptmt0qal*: d.fg t(s: olane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustadkr1c/*y y 0nuble single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes pbn ut3fcb *8t;)z0pomv3)vh,x w5wvfrom $4.0 \times 10^{-5} \; Wb$ 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 on3fv yvc w0m+p+ a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. Iy +3m0vw+vf pcf 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 turns and an ardi,1vr f,3bqk ym 84xdea 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 aa*-te1zcrq.04k;(q bzxzx vk rea $0.20 \; m^{2}$ 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 6smwxi (*v8 ova ctk-y+q-: ww50 m flies horizontally at a location where the downward component of the Earth's ia*-w vxwt+-k: v8wsoqc my5( 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 rohfq/wis 41 1khtates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of it/wkfhsh41i 1q s 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 al*nx-lc67k g5zv9o21 fte kjw rea 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 10km. bwjmcy(m.3uk/ m;0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armaturq:d*vv .p ld-me. 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, whic d v.v:*pd-lmqh 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 consisth tafs)b,(h k3s 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 v (sm5o /q0n9juq6rud with an output of 12 V maximum when rotated atj /ovqums6n9d0u r5q( 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a max -p15gpn kn)rjimum $emf$ 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 ofi7)lcva uockt7a+ a 77 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 r1i, ,pj/ 0 kmj2.ja8vvzp fqytesistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bat,zmk.j0/japiqv 1f, 82vjypck $emf$ 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. Thup7k* r--gn kte operating current is 1.0 A. Wha *kgp7u-t-k nrt is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V psk.9 w 19gd1qn):tuy y, ju amuy2,zvlower supply. The operating current is 1.0 A at full speed. What is thvl 1u 9,2 q:gz1yuutadm)9 ks nj.ywy,e 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 6.0b188e of e9uw-c w*3rq hpr(el W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is r (3r* 1 w8oe bhee-fcq98pwluthe 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 nee7z-kjy:6 h orcded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flflpb*wmw7 3qsfj8 d(4c /i)p sow in the secondary. How many turns are in thd)4sps l w(mfcj7f3wpi8 b/q*e 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 ne lybyh/(e+ac98mr co9ma d ;u/cessary in a 110-V primary if the 24-V secondary has 100 d9cc ( ;yubm9ar /y el+ha8om/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 prcyuuzk c* v1yj9grvw ia6;6( (imary coil and a 2000-turn secondary coil. If the current in the secondayz66v j*u9c;ca(uw(gyvik r 1ry 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 tra;.*/pwn9moe1g7qos f dv zneh la0a9 .nsformer. Assuming 100% efficiency, how many amps at 24 V can flow in. 17o.af g*nw9mv0asdh9l e zp;q/ eon 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 provide:smqm 4mk 7ij*s 7500 V at 10.0 mA. The prm k*j7msi:mq4imary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 31pnmyta*+w o300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presw 3p+n1ma*o tyent 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 ha0d:obq . +xh:acxsblz,x,w8ws 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the hqscxa+o0:,,w bbxx:8 dlwz .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 n +o*ojy1ikxt17n .hygb/yjpt 6d - z9100 turns and its secondary has 200 turns. If the input current at the primayo1px79*/d-6bthjyjz gt1ny+ ok.inry 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 transfofd/qjq/kj08(rgxgm)1 ke0a n) blre .:pg1 c vrmer has 100 turns and its secondary has 200 turns. If the )b (m e/ag.r fe8pcq10j 0kgjdq:rg/l)vxk 1ninput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. bk1bz n4sl .om2* xk5kIf the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectin1sokkmbx .k *4lz 25nbg 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 d6 gmm8h*,zby5 jo1(iom kg-s c3el) icurrent 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. siemo 63(jgm8m,1l dy)h* zg-5ick obFind 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 currf)-wxh67 ,zwe; xav. v4jcpqwent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through 6 vw4cqfe. ,va w-jxw) phz;7xa power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. wu/t dnz*/i /4unlt(mrdq: e. The voltage is usually stepped up to 4500 V by a transft *e:qd / i.z(wrlunu /nd4t/mormer 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 stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a t/m4l8e 7q * ewwl:l+iaddo- swotal 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, th/sel4w iaowq*d:l8e+7dl -mwe voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission t+8rpg8629zc ixh* t yv+ afuwline 50 km long has a total resistance of 0.60 W. A generator produces yu9cz+ + 8f2hxgwtpti*var68 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 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 l-6 k5bio6kp 9qa;scvvine at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at kp;-kc s6bva95o6v iq1000 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 9,2r**i0d pank9jpx m6wcqlcat 20 A. It is 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 loss in transmission is not to exceed 0.010j 9mqx prk,cnd0il*w6 pac*92% 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 d-n,ic gegn doma;i;2 v3w3m/ in the coil's magnetic field?v/a d dge ,n 2mci3won-m;3g;i

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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. /2x2f wi:gkq8btn vg8 What is this circuit's time con822ft8b xgk i/ng:wqvstant?

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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 isfd/bt6h un(+g ) s6des 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 outl c;u9r kpb0+,c+ungsdje- *i cet. 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 resistan i/-b 9z0uia9tiqvq6sce of the lamp? 9-ai6qqtb/ui zis09v

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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 i(gudhmr6 1v6u 5vws8ms the peak current through the s6mv1w8u(muv5h 6gdrresistor?

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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 connectapk4 x ukcgev yis8 76l3(t va2l(),eked to a 120-V ac power supply. What is the power dissipated in 8l(exc3pva(,u va4 s7k6etk2) yli gkthe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50- qvyr;/,lvbx-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto ;ppo4k:iy5jnr 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 resisto;mhisv n w;6q4b9gac7 r 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 reactancfn -.k t,*+uc xk9izefe 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 axhhp)sfmvw)bf 5k749 u rc n;g+)ymg3 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 w h21sn8u 5dlid(v;km scle:7coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance a/ d2jjuyer6w 4*) yznxt 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 20 kHz ,fc 1obzl0,ih is applied to i,oz ibfl,c0h1t?

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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 throp5 ml 9r+hk,b,xe5bmbugh 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 reactance of a 4.7-mytd8.z h z;w6yF 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 cap3hs s-, ewbda:acitive 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 reaci80ri. 8ntaj2ge *aeatance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will them8(r,x hiu 0kb/ bt)mh capacitive reactance of a 0.010-mF capacitor be 100 Wmx bb )/8uk,t(imh0rh?

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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 throy+wc 0hzwdb z:o 9n(d)ugh 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 rg6meo m/8(cx8eqij( k esistance, 15.0 W inductive reactance, and 10.0 W capaciti8iekqm 6 mox((8gejc/ve 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 1 - oog.9k4 9zhv8zo/qr7fhddi500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conhz -f7d /.9 dvik9oz4qg 8roohnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mt5qv92e(x+gg n s;vo0d kv6odF capacitor areo2qd0voks(nxd6 vg g9 v+;et 5 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 indi2f m-qyj,yjxcb dgoe58v nf*ha 1do3. ,.fy 7uctor, what is the impedance at 1yg.o- j.7 , i1hxve bod8d2ff 5q3fm *njca,yy000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induct febjcb r9+/0wor, what is the phase angle at 1000 rbew0/j+cbf9 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 serieq +amu,* rvkt/+-r.fnfyk pr +s circuit with a 20-mH coil and 1.0-mF capacitor for a totau*krn +vkmt r / pq,-r.+a+ffyl impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-Whz0 v83to0 rinn2ri1-.ja: 3 duiagok resistor and 15-mH coil to get a total impedance of 110 W at 20gnnkrj38v:u1hdioi.z t 3o02a0r -ia 00 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 ser ) e+cvhh1u )9be-a*yky3pgiries with a 450-mH inductor at 5000 Hz for a totalygh ck9 e ui*hvbep )1)yr3+-a 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 ,7 ya8kvreh8bpdw dg4o /;y)s resistor at 1.0-MHz for a total imphs/k g8a,b ;4r)7ydyvwp eo d8edance 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. Whas/u4xg b7ku)rt is the impedank4 7us/ grb)xuce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHztq*5(axp05etjl5*lo+rf: t jlxl4 to for a total impedance of 45 rlj*0+tp4ax:llt*x55ejtfo oq 5l(t 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 l)iufu*nad3i(r :3zwat 1.0 kHz for a phase )( *r3zaid:luu3 w ifnangle 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 witwcb;9 k(bny +hh a 30-W resistor at 1.0 kHz for a total impedance of 45 W+ b k(9hncw;yb?

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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. W-*rye sqh9z 9nhat is the phasez *q9n-9ysrhe 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 5.01hcr8h brf8h : V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sb8hrr1fh8hc : eries?

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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, 2*k i.i8)wz ttbaq9tzckd, o2and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supt9tto k.8za2i qk)2ziw*cb,d ply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an ind .;afpwdq41fg ih7 47 6bdjlruuctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power so;rf 4 wibaq4dphf7lgju6d7 1.urce. 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 circui 4/n9vnf;ucfj t containing a 50-W resistor, a 10-mF capaj 4ncu/ f9n;fvcitor, and a 0.45-H inductor, when 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 with a 500-W resistor forjln/abyko/ 8h6lpnz/4h7vp(f /*s c r a phase angle of/pn/ hlshf(o jyl* b6/kr4c/vzap78 n $40^{\circ}$ 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 -e9ly * ,n9cnohopz9l.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving souc -el,9lnzn* 9o o9yhprce?

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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(c2 f*sf8 d zadxxb5p3 resistance, 15.0 W inductive reactance, and 10.0 W capacitive *ds czf5(8 x 2ba3fdpxreactance, 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 ACs7)crd dq +ur7 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 resistancqrhkh.q. 71 dge of 30 W. What is the powhh7krdq.gq1. er 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 fac flbw14bd;i. rpt 1qb(y-by5ntor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H 1y.t 4p(1;l b-fbrd wyiqb5nbinductor, 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 a 1.0-mF capacitor a0 ruz0ldxfkxud :) dy /3nl*x dy7y*-hnd a 15-mH coil in series?k0ylnu/dy- 3*rfd hd* )y0dxz:lx ux7

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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 aw+:css idfal/blefl.6*s*y*e(j sv 2 4.7-mF capacitor for a resonant frequencyl dy .2 fwfa6csbs ls*e/v:e*(*jlis+ 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 inductor for a r-hkh 3gr84i kkws)x h7esonant frequency of 1000 Hz?h-kk his h7r4g)wkx3 8

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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 sexrke)bvkv, t8dy771y e8 c px/ries with a 30-W resistor and a 40-mH coil if the resonant frequency of thev8p/8d,c key7etby1x7 v r x)k circuit is to be 1000 Hz?

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