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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 u(ygc-+nltno 0 nits 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 inductioqi 16 an3hs;ksn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces whaep;2-m is /a(9;/hoil l jxycjt kind of change on the induc xi/ s;mpjh9ja2; ellc/i-o( yed $emf$, 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 th(i;ux4f * 3zhsf guz(qe magnetic field through a loop of wire produces what kind of change on thesux(34qufz*z(ghi f ; 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 kinda 5/ylncr9kjn(y u g2dl4q; i5 of change on the induci2u5dya;qy 9/kl4n(c jlg 5rned $emf$, 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 magnet9 xmco (6j6n52 f3abzusmjy4xic 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 cond (t1c-ofqwa1fkopix 4mxr2 y2v,:u f7uctor will be that which tends to produce which of the followi,rf7:co o(1 2ufw qk4tyx xf1mivp2-ang 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 magne8m;+bt7xkul3kv o m -qmbk1rdkc 8/ b her01a)t is held above its center with its north pole pointing down. Theardbv0h7 lkkbkm+1e/;-r 8x) 3oc muq1 mk8 bt 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 liesmb43q .m53u.w e jlnmd flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and rel m.l4m.n e u35dmq3jbweased. 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 t/k/21 dzj jzt3oewvv*op in a region where the magnetic field vector points stra2tvjj/vd *wzkzo /1 3eight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current 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 top in a region where the magnetic field vectlb 7, mmr/ 8mhnr+-2zgjrii5c or poimg 2 8r/r,7l-jhb5 +irmc izmnnts straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top is0zkm8okz n vtd+*b06n a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the indu0bd8ok0tn*zv+ z ksm6ced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table *btf o8zyl tmj4u,22 qg,:prdand 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 currenft,p,o2: g8 zd qtlmyb2r uj*4t 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 witb:qmesu q7o q7a1e )d:h the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed faq om qs:7d)e:be7uq1rom above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis fdg.3e,n wta d 8ix3oo0 cncb1 d4/v7twhose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of th3f od,ix3cdc10b w 4a . e7ntdot/ngv8e 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 co z:kq k4+faen bjgl67.nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points zeqf:g jkla+64.bk7 nstraight 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.d0yo5 q do54fw
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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 thg (;te3+gb ruaqk/p 2k7x 2dhdat 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. The3pbo7 sg e7n5dc6qo7m $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward 4*iu :/ -hbypsshtcm ,l:y9ho at constant velocity through a magnetic fip-s/lhty mc soyb:h49, : h*uield 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 ruk:8w7qs (ia hotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorkvkq/ m,ai*6y 6wlr;e transforms

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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 revqspjv )f1- ydj*rd5m4 olutions each second. The frequency of the -1qfdj4 s5vd*rj)mp y$emf$ 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 usedi5 ,bs.civ* )shwqgrb.id l.. 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 deviqh5v 8u*g:vh 73xaj emce 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 the primary coc+2ypxnuc iz i1j:lrpny zgif ,,6br.7 50(hg il thengni( p+uj:ybznl5yr26,,1ci rcxzh gfp i7.0 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 o kqqj,bd/a1 syt cg5..ttq+t o 71mz7than the secondary coil thetj1+5 /y7.ok17qa, qdcsqtgmt b. z otn 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 po,ua ld39,r fpcj6x;g9xaju,wu pk6mk1kx) * g wer 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 cvp3 yynop9)39/yjapny8ag p x 8zuq: -ircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battew+f7 by9a6tu dknso6( u4a2a+veeqd1 ry of constant terminal voltage. At the moment contact is made with the battery, the volt12akt 4au+ bavf su+e67yn(eddw 9q 6oage 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 indu:e47k:/; ru7thur n.c elilvm ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrosseturklv4:n.e:r/ i;u hcm77l 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 Lg1x1uwq(e 39;8gl 2v mmznflg and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance Lf*p /9miglz 0s 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 indgo:phy+ 3 z9mfuctor are connected in series to a battery. The time constant for the circuit represenf o 9gyp+3hmz:ts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to y q mw8hi. vq+l(72shha battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrea ysh.lqm(v8 2+hi q7hwse 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 sad 2i d;vu9z mhhm)gc:4lff f8+me 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 circ,j1e qfhice+ 2uit, 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 pye yb;gp( l8y2oxryz;* ,6fwt ower supply. In this circuit, the curren6yx pog;r*2bly,e ;8fywz( yt t

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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 uet zvb9 z(j/6q,: ss 7ney2qfu:* pitchanges by what factor when the frequency ise uy vs(b2pftzzq/* ij,: sq69t7nue: tripled?

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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 ;q 9n:n4zjjr6 +,t zyvi7xlbjis doubled, the inductive reactance of that ixq:n 9j,z+b 7 j4l;jzvi6trnynductor

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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 approache sh lm8*zxkx sz.m 8h/svhab,em:f9:-h uo+2ls zero, the inductivehh*sm,m8/z 8 sh 2bfklh:vzsa-ulxe o m :x.+9 reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supplzd)b r0o lm.)z klk,i9w(ec 0zy. In this circuit, the currenzl.mk0wbl(0z) kie,z) 9r o dct

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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 whapd nh27e83nbu7l-jg w t factor when the frequency is trb87 2nn7hwdejlg-pu3 ipled?

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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 acr:o vt:-u9s kkdoss a capacitor approaches zero, the capacitiv9: -vd:ukskot e reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capx; qbhs bfx7x*w4oe)/a ya d5.acitor in a RLa o.5;hw a4xq/)bd fsb7 y*exxC series 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 cira2j;o,s1eb 5 3fvnujucuit 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 impedan dnm*yv+qye, (;asp 2sce of the circuit increases if R increases. When is syaesv2* ,+n ;m(yqpdthis 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. i( 9 py 3d;bl,.kkipjr nfsg*7z /8prbThe impedance 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 imped9hwe mjcs*1 02faq ,aeance 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 bot4oxb 5sl+dwe .oih o8-h double in an LRC series circuit, the reso8 ols w+hi45exod .b-onant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At re 0vnu vptl;e d/di5:tc-9a +lrsonance,

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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 RLi-k uk d-i yhqj3l56u6C 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 0.10jq y2(ckx1m;f m is rotating in a uniform magnetic field of 0.20 (my;kjx 2cf 1qT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mad rh)5t9mx vm2gnetic field of 0.20 T. Find the magnetic flux through5m2v )d xmrth9 the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in q 7umdq 0b8rg+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 at an ang80rmd ug b7qq+le 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 sin:;1ga jsu+yem* gw a 1hh-3qmvgle 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 zu oiv(,c yq;,zg1srhxjj* ++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 vcm2* r+uq6 7qt4 kgaj)p)sefef-5s oon a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the -+*qs q 4mfeuetrfj 7)2 a 5c)kg6opsvplane 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 and an aredkn 3p2r22hm ,;ndok7xp9q f pa 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 at*yihb:/pj c lx3e j p2e4e5x;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 60 m flies horizontally at a/x;hy/ i)pf qp 8qm sm*peq)+gbt+kn ) location where the downward compoy t*)epq +f;+ismh/k g/x mbn)qp)q8 pnent 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 rotates at a constant angular velzhsu7mg( ,+z zocity of 2.0 rad/s about a vertical axis through one of its ends while in a constantsh+z7 , gu(zzm 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 area of ,+rcf x e.v omiap1m*4$0.25 \; m^{2}$. 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 1h h3fk7:n j:wa00 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 armature. Each lova:-v2d18yc gw1urc-l ax 8wbop 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 outvgw y:12wx-bvac8ul c a r-d18put 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 turns of wire of area *mnjc1nxrwwww) skbwc 8s 46 1w)0-ms$0.090 \; m^{2}$ 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 genera3klok sfp *.f+ vt90sqtor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 kq9s.ol fs*0t fp3v +kT 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 wit8d9 b0x,pwfb) vy1x(zl92 ragn yzo)sh 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 operates 5*n34t,+ jrcuqr( mwmv7su tp 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 operates o vviebe8.+f 9ln 120 V AC, and when runn fl9eb+.ei8v ving 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 internaln155 hspvoqs5,l, vw8ox rua5 resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is thl1a5qow5 5nv 5vusr hsp,o8,x e 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 interno zne+bg 5l6y b/)d:pcal resistance 6.0 W is connected to a 24-V power supply. The operzg/ p6lb:ncy od b)5+eating 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 resistance 6.0 W is connected to a 24-V pod z-/2 j7. z c3kkl dj6/u:liiko.osdbwer supply. The operating current is 1.0 A /bd/i.sd3z27lu dk-j kiko6 .j:o zlcat 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 neede91. b*mzln3g3xnk bm ed 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+w/bpeu b3- wi 14 A to flow in the secondaw+ /3e-i bwubpry. How many turns 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 primary if th4gg+qugyc k2( e 24-V secondary has2k(4ggyg +q uc 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 arnws(m)) jk, d 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the)md knsj, )wr( 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 tm9nbhhy 2xuimpru6xp; 2t* qt-59nt 9 ransformer. Assuming 100% efficiency, how many amps at 24 V cx-2 p uum2 t5t m6q*9yhtxinh9n;pr9ban 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. Th9dwzu/t q(jt /e primary coil operates on 120 V. What does the primauq t//tdj9zw(ry 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 tur9,)i9btjv y nxns on its primary coil and 300 turns on its secondary coil. b,v y9)tjinx9 If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its pr lwmdm .hb 1)2r glsjz-i5qx58imary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied 2. gi8bh-5ds)jqm1rzw xllm 5to 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 and its secondary wfnxghk++ w/ih59m(-;; rxzfs6fzmmhas 200 turns. If the input current at the primary is 100 A, we canz fm56(xhinmr +wz-h9f; gfm /+; ksxw 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 tf 5hki, msjpn1zv z.0dlmk0,,urns. If the input voltage to the primary is fm,m lj1.,ksvdzpn0 zi5 0hk,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 100ws ilz zp.fly;.i50ef +g;94 b ol,zsa turns and its secondary has 200 turns. If the power input to ;olssil. b+z0yepg f;4,ilw 5 zaz9f.the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The v 5bq6meyjmf 8k il7kd ct63ffm:o9h02l ,s.zgoltage 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 tl e flb0mokyt si fj39kzq,c7 .md286g6h:m5fhe 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 125/aj+joy lu)a0 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 +aa u)j j/o5ylin 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 currenm c.qy0,pi+ znt 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 in the transmission line if the voltage izpc0 +ym,qin .s 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 0.60 We-c( kwfopvo;. i;iv:. 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 would e vcp.kfi:vo(; -w i;obe 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 fg 6;6rjej9cuqoe o8+ a total resistance of 0.60 W. A generator produces 100 V+9rf j ocqgjoe ;6ue86 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 line at 1000 V. *3p -hrnvb(p qbg14rbHow much less power would be lost if the power were transmitted at 3000 V ins(pbr31v*bn -p 4 hbgqrtead 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 i fgqkx0k 4fg0m,7w;yV 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 stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original powe,f;x 4qig gf7k m0w0ykr?

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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 ik,a-lw j +ari+n the coil's magwrj+a a+ li-k,netic 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 con6h3 nyol1uj qf 9:4brytains a 6.0-W resistor and an 18-H inductor. What is this circuit's tunb96 1j3 yql4fyo rh:ime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120ivm 8tewz7 io rgi)0s;hx18 7f 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 peak curr tci;)- xbg6qment?

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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 resistance ofswom-z7e2: ws+)gypa wra f3+ the lapfg7:sse +-w +a)yz w 3rw2aommp?

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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 /*/-(l yo. dfqw/igqusiyunp3+x ap ,120-V ac power supply. What is the peak current through the resis (u/ yligqp/w/3n+fpo,d- aux.sq*iytor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected y.kgzp1i.+qhh uq 4 s2to a 120-V ac power supply. What is the power dissipated in the resis.hk.ui4 qh +p gsq2y1ztor?

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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 resistorg2gee0j1g.k-os k9sfa qt+e8( n p *pw 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 resistor kq evi*jze9 vc42fj52 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 resistorw q,ty,)hv fv. 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 60 Hz?k o,fi*51y dw/ b)h40nqkhcol

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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 reack-mcv7y( vi uqby/(w4 tance 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-jt) s6+:mte.wo3+e dqny *gha q.sog-mH coil 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 id :k*)*c tk8tgrvy. eqnductive 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 frequencye 6q5 0zov8w at/kw:wgtrl1 0j of 20 kHz is applied tt /j ao0tzl:gw0r86w e5wkv1qo 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,+ ogt28gzrtd 2;.gq es 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 ofqy t 2zjh l:cyp, k;7)yc:jv0g a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to ha/,n lht,bm*mhve 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 p4/4yoa(n* ifm9fvpicapacitor have a reactance 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 capacitioi2- q(3d xnd ch:0p;r2fz it j6emn/dve reactance of a 0.010-mF capacitor be 100 Wdi q0n d6n/xohz( cmfi:p2; d-t3jre 2?

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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 a7yziwv7 ,va4at 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 ay8lrzrwa.t9 c: c(d +nn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capadt 9yczr(8c. na wl+:rcitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH co(y,vsfk6edsz3v 1p i* cjh1a-il, and 1.0-mF capacitor are 3 h *j6ev(1z1fpcys iv,kds -aconnected 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 1dx73r zp5q vwpy5 e4zt9*ei9m 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ip9e qi5x7w3z rpvd4 z5t*ye9mn 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 s 3pagdva f3yydk g/q,86)/hze eries with a 20-mH inductor, what is the impedance at 10yh3aqdv3k , a/zy6 g8fge/dp )00 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 vo4m8ati iz): .* qxsx emie sd0/)1liwith a 20-mH inductor, what is the phase anglel t)vze*m.140 s)q 8iie is/aixo m:dx 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 series circuit with c1,k)y6l mfnnbu;7;61 dz fo icxj5ria 20-mH coil and 1.0-mF capacitor for a total impemyu7 1 k;cz)nr;x fidn1c, b io6lfj65dance 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 followings7n/vcvpia vj2sy97.t9a zv 9 capacitances is needed in series with a 100-W resistor and 15-mH coil to p jv sav2 ciz.97 79tyvasv9/nget a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in seriew q*hst(,,-7d(exw l y6o4 ucenbec /ks with a 450-mH inductor at 5000 Hz for a total impedance of 40o4 (ckt qx ed-c/ unw67s,(elewbhy *,000 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 resistor at +wx,a 4r uj:z3ecgjru8j -wk5j :-wc o1.0-MHz for a total impedance ok5cg co-,r 3u+wraj :uz84wjw ex:-jjf 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 i)4a aq5ix8 5grsj nb.4a,rnh pmpedance at r iqahn4) p8ng,s 55br4aj.xa1000 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 a5sm; 9md ri)bx total impedance m9bm; r5di) sxof 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 capacito 0y /loixm *qjo/-dfb6r at 1.0 kHz for a phase anjdyb -ofl0o xq 6mi*//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 needed in qdga3y/9 b *yfseries with a 30-W resistor at 1.0 kHz for a total impedaygy f93qad */bnce 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 ser m0ic 5itk*(/p l0mjbxies with a 100-mF capacitor at 120 Hz. What is the phaselii/jbtk( x0c0m 5p m* angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20z9lbje: oinkh8mv 5av*(;w a6 y mn1*x-mH coil, and 1.0-mF capacitor are connected in serieswzka;h(*yiv:8lnb eo5 n1mj*9xa m6v?

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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,k5odkir. 6qux 6ra5p) and a 0.350-H inductor. The 56kip5 u6.o krx)dqa rcircuit is 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, a capacitor of capacitive reactancp41i7hvn6l k8j47j dwwoa :6ixyn i( oe 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Who dn l8hx(17wn:y4vajj 76ip4 i6wikoat 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 ar6a twt1n+w4 RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected toa4ra1wt+6nt w 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 9.53*9hopk boohzgzoseries with a 500-W resistor for a phase angle ofg boz p*oo hk5zh9.93o $40^{\circ}$ 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 = gf.eqxhseies** m3+n o;txk29*nf ju /6:n kc10.0 mF. At what frequency should the circuit b.kmefo3u** n2nese9tx;nj: /shqkg 6+i c* xfe driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistancei)j g+z9icf0s, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conifizgc+j)s 09nected 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 circui:bwe-mj8 5vbx i-1 wmsu-fib0 t 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. ;gos s4 nzzyoa:my*8+i1 pc q8What is8p *oyzsy4q 1ns a:;zmoig +8c the power 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 factor7 ha c, ukn1/u6v vpm+f:yrtxh sh( no)i:9+pv for a series RLC circuit containing a 50-W resistor, a 1pmh)p(u varn1v f: ,:uk+9c ytio/ 7+xn6 shhv0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in se1ugdl 8x;bug- +lxp7tries?l8u +txxugb;lpd g-71

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is n nk+rwnenp qy*3s: .f,eeded in series with a 4.7-mF capacitor for a resonant frequency of w rpq*.ynnf3+skn:,e10 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-mHw xh ;wr;8hdga3o594ngl9i8clke * da inductor for a resonant frequency oo ;hernil34; a9 h*a5cl8 ggwxd8k9wdf 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 placed in series with a 30-W resistjkl)er0 kmvv*jq*f-* i) f* hwor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?r0 * *)vhjwffmkq)v i*kle-j*

参考答案:    
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    总分:142分 及格:85.2分 时间:不限时
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