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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magn)4tm(ndl- bypj pa2p7is7r c,etic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thaiwc-j* d l -(-d*ttedqt 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 wir4 amej53 w1b9ejk9owxe *y8ole in a coil produces what kind of change on the indu*39 5le149wb8wexojay k emj oced $emf$, 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 wir 9m *;)pr+g w-b+mgi1asvs k eaz6fay-e produces what kind of change on *;6m a- )-aribmfv9+z+g pkgs1say e wthe induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind 3zu5qe*/z jejh6o* mnd8 kz knr/q-)hof change on the induced jzh5z-dejenn)z/k3k 6*/o 8mrquh*q $emf$, 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 fieldro- ,t xlguf*5 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, yvca e0, *m8 ide(fq27erlca,-jjs0k the direction of an induced current in a conductor will be that which tends to produce which of the following effects? eyev7rj-*asc 2,jlc,(qae k0di f80m

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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 -nx6,mydxw8 r+ dliw- held above its center with its north pole pointing down. The stationary magnet8x-rnxy+dd m ,liw -6w 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 horizonta :ro yg):njve;e/a7*fymu cvz8d;3e 8:axxlbl table. A bar magnet is held above its center w:uj:88 a7vbvy3 fr*c la/xedexzn e: o;mg; y)ith its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the mag -1xcb.t xdsa/8 yx2dgnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced curr2d8sxdg- b/c .tyxx 1aent in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table toktdp;;qk4m, ppa1 z o;p in a region where the magnetic field vector points straight po 4daz;pkk; pmq1,; tup. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a re bnk-3kavharh7(8e+ zgion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is tezbh-h 3+rv (7kkn8aahe 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 o*j f vkhacaq n:(,/jy*n a horizontal table and carries an ever-increasing current northward. Two coils ofjc*:a/ yqnfa( * j,kvh 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 north pole entering firstdh2l/ bqo1;gq csu m8* f 5dy+v4kke:o. As the north pole enters the wire, the induced current will be qk5 do* qs4dbym;1vku: e 2+l8gcofh /(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 aneddikmc g8n8i ,f+l( (gular 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 the8(l8( imen,+ dfigdck 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 about an axis whov45/i d-cz1x 8 le0tb0- zfuzrhvg/rnse direction can be vx errh dvn-/bu 051ziz gfc4-vt80l/zaried. 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.oqsyg;. /:ezw ;w,apu j 0zoy:
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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 )v*u, xx5m15onvgoip 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 fieldd h38c -nk9*pxmfri3d. 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-wes2aijzn/ 0 4m7tcto cl/l7i3xst direction) is moved northward at constant veloc/ /2l7jcxn lm43 o7t s0azictiity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a cons)0 s;lb6 gq5,m u3ej /he qs5xxrhka/jtant 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 transa3 *x xvifg9v.forms

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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.-mbtbd xby;7 / The frequency of thet b;b7/mxy-d b $emf$ 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 de4+ hbdf cs4dcs5 r +gie 6wr)q9ml,mg.vice 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 dcy 3 myp u6j4dqu9j5*aevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than xq, 5 8thnr *gj6 f7n,hcmy4ydthe primary coil ,c74 xnnhyjt6gd y8 mf*hq 5,rthen 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 tw.secnxwh ga, rm)8x,1aur (*he primary coil contains more loops than the secondary coil then it isr, c (8 wxs1ah.wr*eum ng),ax 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 d,o 5mua xv xow-,vwat) pzui7(g2e:5power 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 resonanoze4q if:fq ,:ukun(8 t 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 inductoei2,y5b 3ziab r are connected in series to an ideal battery of constant terminal voltage. At the mo3a5 zb, ei2iybment 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 -r9qnm*tr hu8m)(r px*exed 0 connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volmm9(nrrxe r8ptd** xu-q)eh0tage 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 inductancelu;lb b 5d6pd: 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 4zwfy ievr1 /- v)2wzcwith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 whv6ydk;,0 vnq4 m0g jkc0j esx8sz61)ptj.j a battery. The time const.j8s61 ds,vv )0pt z jkgmxk qej0wjhcy04;6nant for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectev- 48ksh09 bz.ku9zz)q no rp9ahtm3nd in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decre z-hu4aok qtzn 999bks)0rn8 vph 3mz.ase 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 zh cm.+0fymv:ts 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 supplf0sge2 nd:4k os z6;en,vaskwq 2y(a5 y. 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 sup 7m,j8di dz d2l7ur8qcply. In this circuit, the current2qujd d7dlr8,8zimc 7

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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 whe+r5k 1+c-k rop; jv.dcif)cbrn the frequency is triplef - rkv)rrcpc1;k+o cb.jd+i 5d?

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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 vol2hh w4le(3pi*( z5z jqryi )cew91e fmtage across an inductor is doubled, the inductive reactancpehzy4wqmwih ce1jr *e 23( i (fl)5z9e 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 approaches zero, theh+lxch-y;pnw0i1 ntpz,j 6i 9 inductive reactanc6-j +ypxn n,; wp019ctihlzih e 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 connecti 5,a:wusdpalzc olf6,u4e2*l, *n e ied to an AC power supply. In this circuit, the curren,i2 **,iupwz5aens ao 4f6cll:d ,elut

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what fact0ujzq)ig, s 7eor when the frequencq0iusg, 7) ezjy 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 appr2ihzjvt+7y k8oaches zero, the capacitive reactance of that cap+y7htv 8j2 izkacitor

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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 ind+kw y kmb 9dg)87ddm3xuctor and capacitor in a RLC seri b 8ky7+)93dxmkm dgdwes 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 circuit is def,cds0bd6t jlpv47 e8 sined 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 impv d/(e/ 6mazkeedance of the circuit increases if R increases. When is thz(e/ d6 mvake/is 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 cgqww* gyk.84 :c dsli,ircuit 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 seriesn vv if dpikhj,).ld08a 0+y4 nsz13ru circuit. 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 circuldvjpx m 6*wtlw*++q (it, the resonant frequency of that circuit wl*+qd ww6xm+ v*j p(tlill

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuepq r58/y 6ls1/fb1mc j gayj0it 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 circuit occurs w8 q3zgx + maig**ek) w/pf wqyat+;a2shen

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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 u;z7cwu2k b/,z (qr(cd pc)xg0.20 T. Find the magnetic flux through the loop when the plane of the loop and the maz(b;cx2c u/ kp duq,cz7)rg( wgnetic 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 r5x5z4x4 p aqr1nv g)jkadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the maaz4x5 qk5g p 1vjr4)xngnetic 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 mcip4g79n/:d w osw00tc 9-ehsj/wd mq is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne4dg n7 c0-// s wcimw09sp deojhq9w:ttic 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 adjusc gaqbse/h* 4(table 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 changj .k4ooir q pgj4mbyu8/ .5ww+es from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squar goiks/xs8*ed3 yd;+8r:zdo we frame with sides 18 cm. A uniform magnetic field is applied+kidx;zo: o*8syds 3rwg de8 / 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 turns a6nh 4kcsp6j(iko8syk7,alb c6u e0p9 nd 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 areaokazk.,. atp5 $0.20 \; m^{2}$ 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 horizontacl5b (+ohlau6 lly at a location where the downward component of the l6(b+olu5ac hEarth'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 barh qy5fwi 2jczgyr5qv(n ;4w l17am: )a that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a v n2:5)vi5 q( yfzah 7w yr1gj4lmcq;waertical 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 and a cross-s hsm5 ,pocu1eeun so,x4( v;m3ectional 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 tur/tu5jx e-qv8pp( j2 m+4nnosbns 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 rectanvq 0pid./qsd) gular loops on 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 td s.p)i/v0qdqhe loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turv1u.mx d3q7p bstgj(:ns 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 y+5gxg74f osjof 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If tsxg5j4 g7 +foyhe 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 gene1u* .i+nmpso c,2q+ sq)qk izhrator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operat iu6 lpu)/gv- mtr5tj*es 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 i,f.,e,itt4q(ggyp p resistance of 6.00 W. The motor operates on 120 V AC, and when r yq,,.(pt4g p ,fieigtunning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistan 9f 6brczw0vper)be.)ce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What i 6b)br0cpve9)e.z frws 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 resista5rsed :a4iszs 6jmp;5 nce 6.0 W is connected to a 24-V power supply. The operating sa;sdmz:e 5sp564irj current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanh r-8 qs9 ;+ufarhsj i63ud5iqce 6.0 W is connected to a 24-V power supply. The operating current ish5 sqr;jq-u38 i 9uaid 6shr+f 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 voltagwzd (+/mjhw h-nvb 9,se of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secom5zxdv0t l:k.;wfm h :ndary. How many turns .mwl 0v5 xtkfmhz:;d: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 110-V primaryk:9rai2o d/o) 4te yxq1+ykex if the 24-V secodri )q:2y9yxt4 ea kkxo+o e/1ndary 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 5 q-l7ng 4 w+civo6rah-kka5kand a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary? whn7kai5k5 - r4-lq+avo6cgk

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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 transforme*n6rc txv.-0rvn)p d4xrjb b/, aw+z tr. Assuming 100% efficiency, how many a* tx/rx6 ja,v.z n4rc db+w vnt)rp0-bmps 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 at 10.0 mA. The pg;ogou83-pvva5h e63ba ikdp5/ x wj9rimary coil operate- 8ojkaw53;g6obiu5x/vg pe dv 3hpa9s 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 old8,u9v 2iyz6 sjb6 me7dwh3on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the ,7mo9jye 382sibl6uzdw h 6 vdsecondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turna zx)b0nd 2g9qs on its secondary coil. If 120 d2b q9az0 ng)xV at 2.0 A is applied to the primary, 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 ankdsr:u;k7 n1 kqyciiv6 4 h/vl ui,)jg 30r:hxd its secondary has 200 turns. If the input cur i1rxs; ui, 34 vc6gj/nik70u:yd:r) hvqkkhlrent 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 smlr1t vhdq+j)vkra* ;q9da c. +gak 66econdary has 200 turns. If the input voltage to the primarl6vka kr;at+cvmd9h.a6 1)*dq j +rqgy 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 t3ox; y-7b sn/jx+j zpburns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power /yxnbj7 ;bpz j+s-x3ooutput of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepp a 9jzci21v2zted up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the nuaz2t 21z9jivc mber 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 120 V. The voltage is usually stepped- qm e7u3racx9*(abng0s.kjz up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lostx(gnasrk qz09aec 7mu.3j*-b 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 1o)k;:rgmur ; h uhyw*yh+6k7z 20 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 in the transmisyo m+z;;u67hrhkr g)wh*:kuy sion line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of imyld+ vyeh gs.g4+j rp(t:6+0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heati:(te4ihpgvd yyjm6+s+ l.gr +ng 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 would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has ap6zg19i gx2 zaa1taz2 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 losz9pg gaa t x1z2zi62a1t when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power z880(j-w yzquv6 b icfkm0,q bwould be lost if thzv6jq u8m0-,i8wqcb k0f(y zbe power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to butpwub-/* j di0brcc ,h*;;rqe 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/r*h tq -0 w;bccu;u*,ib pdjr 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 iss7lq6vt4zbn:vn *hkh;25 f e d stored in the coil's magnetic fiel f :6n74vvben*tkzsh;l2dq5h d?

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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 conx-dtibzg 3zaoti8 jc n1n4i:h+ rqo1 l; 8r(+htains a 6.0-W resistor and an 18-H inductor. What is this crrl( ahb c8oio+iqiztzhn48:x1-3ntjg; 1+dircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rmsf*1 1.nrazh (fgiv4wz voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the p4 :3z1vl2z9 ess9 0czczozkooeak 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-v7 ni;vn ,l *sm-qza0dz8:y wu:hsiq7V AC outlet. What is the resistance of the lau: ;a:7-szyn7qqhv,*zim nv l8d 0iswmp?

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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 m67l , .;vn r9 xp)wkzfvptx0r120-V ac power supply. What is the peak current thropvmt90n,z vlrw6xpf7 ; x.r)kugh 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 conn 0vx lgqd*q512vnz/ikected to a 120-V ac power supply. What is the power dissip0vg5v2xnkqqld zi 1*/ ated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorekoa:h 3hlr)t + pjxo/-lu.gq26fcs7 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 5 xwptii u(6rocsh ,-l2i 04(bj0-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 rvqk 7z( )0+o jtt7urmoesistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 67kz qq/tyw9 e00 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 reactancdfmi g sv+dx)2.. umyx 9r5vd6e of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of induhqh23qeo sh 9+ctive 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*ut /xk2jaqvbdl* *(v 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 frequenco 0 d6f)jymgz4y of 20 kHz is apg0y ozfd)m46jplied 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 due to a 110-V, 60.0 xmogy 7;gt h0-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 irhu1ri p10q,xh+vb6w6 jo/0 z9kdp nof 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 ne,z6of5eq*wvv o)nw9 eeded 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 reactancefrr4 t.g9.*4 jl1wji .w ofnoolz.t w. of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1pgqp,t6k+k6 hzky0) z00 Wh6 zkk tz6k)q+pyg,0p?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 Va e 1erb8m.n7 gij -0qxgzb.mj0w8c:y ?

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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 wh v:(76:xsbauy/dl l 0v ,eftyith 12.0 W resistance, 15.0 W inductive 0 lv/atfxy : bheyuvl,:d(76sreactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-Wu tnvc)w7 pts5nf,c1 yc lchox /apx3;20(r*g resistor, 20-mH coil, and 1.0-mF capacitor are co;plc)3t/ o1up7* nc a(cts r vnfgcyx2h,x0w 5nnected 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 e*arrtlgnmd0 a z2 31)100-W resistor, 20-mH coil, and 1.0-mF capacitor are 0*rde gmzt1l)raan 32connected 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 connecteazcy0d,qu0e 9 d in series with a 20-mH inductor, what is the impedanzu cy,a 0qde09ce 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 4 y8acq*b(vqe with a 20-mH inductor, what is the phase aq*ye av c(84bqngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a pm 03vd +w*khvseries circuit with a 20-mH coil and 1.0-mF capacitor forv3*m0kh pv+dw a total 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 needp lm7 2k rkr0vv4p otcp,3mw(,ed in series with a 100-W resistor and 15-mH coil to get a total impedance of 1(,m pmrpv4lc ,k73op rk0vw 2t10 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 seriesb:3/ gsnf-;bdzb:g wg - sb)i)n 0fooq with a 450-mH inductor at 5000 Hz for a total )i; gbdqfz-0s noog) -n f3/ bbbwsg::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 resis4nsae. 6 n( n wx4i9wgdg n,sak95ed+j t99lwdtor at 1.0-MHz for a total i9d4 ( jds4 w5twlkadg6g9ne9i,n +an 9enw.sxmpedance 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;vsha3tyt t2l,z)d1q with a 20-mF capacitor. What is the impedance at 101 ahstzd,vt )l3q;y2t00 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 t-n(qn hd4be 38 skn)oa total impedankndb)s4 he-on83 nt(q ce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 5m6ktw7b ugu 610-mF capacitor at 1.0 kHz for a phase ang ukmwu b7g6t65le 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 u6 xqr 32aua3 ejqia+,resistor at 1.0 kHz for a total impedance ar3i2jqa36u qaeu +x,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 seryu(,fwy2+t6(a+ dk saiu m-qy ies with a 100-mF capacitor at 120 Hz. What is the phase angluyy kst,(2f6 (-y++mwidauaq e?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH .3eu)2-vsgc :ni clc9 fj6ceo coil, and 1.0-mF capacitor are conns i 9) 2-6ceoune.cv 3j:lfccgected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a /p 1vf .we0/zg,on lkg0.350-H inductor. The circuit isg/gzn1 eo fvl.,0/wkp connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, zmc.adleb sxb-z/mz (-w3c0. a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110dz l m(/wecmsbzc-b.0 . -a3zx-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 conta )ktzqnkk9o)je ) yk/g:7flc :ining a 50-W resistor, a 10-mF capacitor, and a 0.kly 9jk k:z)): /tc7ok)ngqfe45-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 for a phase angle o;ni +krv1f)tof fto ;kn1)rvi+$40^{\circ}$ 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, 4q v3jqt-c o;bhq+hy*L = 200-mH, C = 10.0 mF. At what frequency shou3jh 4 -htqby+q;vq*oc ld 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 agoq ,ik9ai 2ufp*:v3fyvej8 3n ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is jf9,vf3*v2i8q :agy3piuoekconnected 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 mf2pri 2n ,o-wcircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. W/ )vh,mb4h. xcbf1yu hhat is the p4 x /h)mufvbb1,.cy hhower factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit oz*;qmk 0vph( containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connec*zh0qmo p;k(vted 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 and (+u2yrekri zrtu 5i-b,u3 8f da 15-mH coil in series?r d,(f38-uziru2kyre+tb5 u i

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a res+e:(idxbh -la l9slcpo26tm4onant frequ(bh ldilp s xcl29m+eot4a:-6ency 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 inductor0 ry1 hceujl4):on u/bdp pw6tcj(u: 7 for a resonant frequency of 1000 Hz?(j 6wp0:uc jhn o/ur)epcdt:4u7y l1 b

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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 resistor and a 40-mH7ocl*5ey 8bp d coil if the resonantybc e*dl57po8 frequency of the circuit is to be 1000 Hz?

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