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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    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 magnetic fdr731d)nsf z clux 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 stat8sf7 u+o4iwjswpuon w+wu1b+u)a7x 3 es that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of changn e .r9v(pox94j)mrjslyn 7x-e on the induced vojnn794mx)lxe r-r(.s p j9y$emf$, 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 throughqw5 qbq-3xx +l a loop of wire produces what kind of change on the ind3x5q+w xblq-q uced $emf$, 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 produwd+v u*q5esx1 ces what kind of change on the induced5evxw usd*1+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 frb,vcm3f,28ql f pcw5w om a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced uc 7ejg7ep5m,current in a conductor will be that which tends to produce which e mu 57ej,7pcgof 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 bars9 t. kh8r ub. o9;lepfcoq;0 zub6q/o magnet is held above its center with its north pole pointing down. The stationarbropso .9qubc;ufz h6e qt.k;l809 /o y 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 flvz k*p 0a6qmp02o7z djat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induc 6v0a*dppkjoqz 07zm2es (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 atr,2w7juax;l .h 8.sdl;gc83om zgbp region where the magnetic field vector points straight up. The magnetic fieut8g2llcb3;87xp. ;wjmz g.dso ar h ,ld 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 leme ic8xe4 cie5r)tnbp5(8 e c7vel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from ac5t8 7xmnp cri 4i(ee 85)ecbebove, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where vybx*5;u5v; z 9xnccethe magnetic field points straight down. The magnetic field disappears suddenly. When vz nvc; v;95cuby*x5 exiewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizonzq722p6qj2ivn otln 5hmn7v* bw; dt0 tal table and 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 current circlesn2t*n wv;mz05 2jl obph276tidq7nq v

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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 loopkx qn6-8e3g1z;mxuqb of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed f;bnxgx- u3q z8emq6 1krom 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-e:*erxpr(y 6k vmj7a rj(q7v speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mr j7kmy6 x:*jqea (r vp-e7(rvust be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis jj f:aim43mnzp* 8 wn:whose direction can be varied. In a region where a unifo* w3 pz nmn4f:ai8:mjjrm 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.8 1gj * vnw.)jo8,jisnly6rpvdw+ 3td
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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 lj1e1vqbob*w yb-dk d z+3 v90that 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 fi f(s(:k),g*zjn skb s(1qpnv l6y bwv2eld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) i- l 2d6nh:mqboc/-op 6pant s;s moved northward at constant velocity through a magnetic fiol p:t6dpo 6n-; qb hnc/2a-smeld 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 constant argj:dt ,erp4.3ku wb h fv1451dn-r jfngular 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 transf60kgqr 8 *:rz8dtstla orms

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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 revolutionskzxy1 -1edg+ bw0k5;ifpv u* k each second. The frequency of thep*0+15iy dkzxvue;-kwbgf1 k $emf$ 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 uu5 o4m7 )hbc ermxv7 jl/g+ma*sed 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 devicendsc.hv jj( y+pj+55h y 0qt*q 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 seconda:2 x i(2aufyqgobm e4wjo6y41+9g *gc:bbvf kry coil contains more loops than the primary coil thenfk:94e2yo4qju(fx o6b+ y1 g 2cmwivga* b:bg 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 co7 p7 okazf ub.4*ej,egec 9nc:ntains more loops than the secondary coil then it i*z9bg. n ca7:ue,7efkc ojep4 s 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 inputsxacf4e .1tm56upeovp; o9* p

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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 circ7kh -8smev 8. 3*javjzywjg8cuit,

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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 tnp, *pxznq 5u6 *ixlm.o an ideal battery of constant terminal voltage. At the moment contacm u6i qlpxzpn 5,.x**nt is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an iz:kmr/n cbe+ (p+cl+qo(fyl m0q1c1rdeal battery of constant terminal volta: lc+q+f 0q (y 1(m/rk+ocez1rpbcmlnge. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is co,tpv)zr l 5z2cnnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectedy36tt hr1d0epe0 h (pk2r *yai 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 g (,w4 n3t68xalvk7 k4ke6c/kvzxx4b m cqga5 connected in series to a battery. The time constant fot4(4wk vc6xx 5akv/nc mz8, 47bg6kq3e kaxglr 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 connected in series to a baxgz +* /k/tg 1vsrif(pttery. The battery is suddenly removed from the circuit. The time convix rsp k z1fg(+tg*//stant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sn 6c0*prya9mi4xz1 yjw.,g ayame 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, thbxhw9,(vzmpozq82,0nd3oz , / bfq ij e 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. mh9+9 a7msbut8*91znxb up ko phy0-ze3 w2vf In this circuit, the currenp+9mz091u- bvx eotyun f9m*a 8h7w23kbs pzht

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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,01ja3 fy mkkvl)es v;n the frequenk ,l;30jfvm1v a eyk)scy is 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 indubtqf/,00vyicuwhg 8hg 7lu 87ctor is doubled, the inductive reactanc uy00hg78/lqc igwhf 7t v8,ube 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 iunl8 /ym)wxvcg g /2s4nductor approaches zero, the inductive reactance of that coi8x4msgc /y /nuwlg)v 2l

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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 sup0/hjo7tz4pw rply. In this circuit, the currenjw zp ot40/rh7t

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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 anm2/rt+vjdwa qm, h.0d1meb f4 2tg+ys ac circuit changes by what factor when the frequency is tripled?sejrm4gt.yvmdaw12+, +dh 2t0bq /fm

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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 zep4 hpb;en+ f5kro, the capacitive reactancpkhnp5 4b +fe;e 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 betcp-,ngyt u q 8-1ssmhrx)7/u og d/iq*ween the voltages of the inductor and capacitor in a RLC seri dq)-r/7 mquy8s /u1sg-pihnxc * t,goes 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 ij9u5q qo shdp+h062dju5 lb x38oio;is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the cz4:c (p;a7 qaf z.xa6irq5tf jircuit increases if R increases. When is this statezx5qr.:i6ta fj fa(p q 7z4c;ament 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 ci0 rfxnd.zl 3l3 /z)cvl/bj zl-rcuit 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 impe 2g;a 64v-+octb-d ngocpij 6vdance 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 bz wlns(ael/*3 89koi foth double in an LRC series circuit, the resonant freqzi*a8wlf 39esn lko (/uency 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.l3a 9s x0)qivehpwqd69g al8 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 w(e( j cyhwn;q4 w/b-t miiq,u5hen

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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 y e0wry(akatt-c (of ;ih75v0field of 0.20 T. Find the magnetic flux through the loop when the planew cty 0rt7vya (fo;k(ai 0-h5e 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 unifh v)y31hy avq j hmh3q*;siyx;1 -a,heorm magnetic field of 0.20 T. Find the magnetic 3hayqm- vha,1 si;h1* vxh;q )y3yehj flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating fhi6a0 41jnbx w 95y))ssfupgin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of theix9n1 )fuh5y)ag 0p4sfw s6jb 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 adjustable single loo 6u(::ir mqpuop 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 coit(1)m1wkcc9 yfjdv;b l changes 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 wpjp7vi,(,jcau d *4fdire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes ,7*va4(,uj fip ddjpc 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 withnxws*4 * tenk6 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns r .0h6mv1yyycs88 szcgz7 t23t,ga6h5q oxdu and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a levh);s bq9 cl5ocation where the downward componev ) es59bhcl;qnt 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 a h6t9wq ps9o 5 y61yg5ve:x k0hu2yuzwngular velocity of 2.0 rad/s about a vertical axis through one 102yyuzw 65go9yvuwehsth6qx5 k :9p 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 loopk6d*-qaf .qjmpwn5z izi,k oy 3-wy5 *s and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tfmn 58ylrs/8rmvif/+ urns 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 loop is 12u gy79 :civqm5 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, whqimg vu97y c5:ich 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 turns of wire+z /y2;3vw6 xwczq/8 ilzk zyz 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 s0fl 7 rc+dz48t ey1dine0v;ssimple AC generator with an output of 12 V maximum when rotated ;sy 7+reedl 0i s0v4ntdfz8 c1at 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 genezqddn 7,* d3ylfvf(t g/(1gaw5 i vru2rator 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. Thm wcg /h;kcvm; 4+dks:e 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 l9 co(4u(iq bg2g,ruq resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed gr(clg4 u(oqq,9i 2u bit 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 resik 81f a-xr 7o-)adn-adl.pyfnstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What isrdpfo n-n1xy kala-d) fa8 7.- 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 connec.0cb2jthr 6 qsted to a 24-V power supply. The operating current is 1.0 A ahc2q tj r.06bst 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 2fz) g ,*)rpijt4-V power supply. The operating current is 1.0 A at full spergp))iftz*j ,ed. 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 prim 3 xif4u6w+ewfcxy2 h6ary 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 ca,n e ni2sin1tun2;ox 4uses 14 A to flow in the second1ieni 4,s nxounn;22tary. 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 manywy n/d)zftdyz-/ mbc-.o 3/hz turns are necessary in a 110-V primary if the 24-V secondary has/obdc-w3fmy . )nh tz/dzz /-y 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 andmb6n9u38sylev 4e wts7y79bg a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the p4 syu te67lmg93bes nb y8v79wrimary?

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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 transformer. Assuming 100%5sm;cn4 g7ih r efficiency, how many amps at 24 V can flow in the secor5gn 7shi; 4mcndary?

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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 -e*- uwq-7f3 v 0xednm(icjgrxtj)+lprovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the trnv- (l-+j 7mc3-iwx 0feqx ug)j*deprimary 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 300 tu3e yyh3 ptw,vp7(aip-d f)be3rns on its secondary coil. If 120 V at 2.0 A3y37h3ppted-bpav y)w f,(ei 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 jn(8qf c;)zc i umi7)uprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applie jn)zc;8umuq i)(7 ficd 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 wm,vgway(ff n p855m5 100 turns and its secondary has 200 turns. If the input current at th,5np(vf w5w8a yfmm5ge 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 ha59(*qbo n+zjpn6c3jtuz ue: jz6 mm )0tcqju,s 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of tpz)qz c 9 uuzmnqjet+:j(605bmc,* njo3ju6the 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 and6 zwi1lch: /)vg1iohr its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary i hz6ov: /1hiwc1lrg )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 r5m,8yd7f jbzi3wk4txt v9 .vis usually stepped up to 4500 V by a transformer and transmitted 3kx dz9yrwvj5f, v t.t84 bi7mthrough a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stqd: o6g 06dibrfa -i-depped up to 4500 V by a transformer and transmitted through a power line of tota r-bfqd6o- 0dd:6gaiil 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 psubl 1072ydd;.apivat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted dppiyl10s2d uv;a b7. 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 au g4*vb0a30uw p8u tot total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to he0tt0b gov34*uw8 uuap ating 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 a total resistanycgin7s 7q*z+y 7/ntr58lmwace of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transf7nycs*z7 mlgnqay +/8 i5 t7wrormer 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 er/rnwbdd,j;)0 a ux1y(;gt j V. How much less power would be lost if the power were transmitted at 3000 V ind awd;uy 0jt ( 1j;nre/xg)r,bstead 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 440i7 u:1mjz qifd)rl:q:c- fo6x V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tral6qqz:7m o:ri)ffij c:1ux -dnsformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a s00-p+( x+tau d; g1iyddqw idcurrent of 5.0 A. How much energy is stored in the coil's magnetic f +d( dxg1idpsi00utay;-+ d qwield?

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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 bbx+4y3 no)*ytg jj:q6jkb q,a 6.0-W resistor and an 18-H inductor. What is this circuit's time con46,bbygqok x) tj3nby*: qjj+stant?

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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 cs9rvhz kztne .6 mt-tg/c5);bircuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is ; y35f4 u(haydrxu igy9ye*x( 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 it tmx f231xmwln c,:i7s the resistance of the la1xm3c2fl mni t,:xwt7 mp?

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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 connecte /nknvn 7hi1u,d to a 120-V ac power supply. What is the peak current through the revi /k,7nn unh1sistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to zblem*yro. w6 )67v v4qgip3qa 120-V ac power supply. What is the power dissi7epqqg 6bo)*v63 4.rm lvziwypated 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 resistou-xy9j*9yzk;u yre u8 r 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 rs q u n4xmcoerl.:5*550-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 resistor is w2:ycfbr/p.-hoyhr 7 $I = 0.80 \sin (240 t)$. 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-mHw/zz3vm(;(u4eyp/my h t5obl inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coql69b g+udd.fwf0:ikt8hk2li 5pp w 0il at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reacta/l4q q- fcc5xfnce?

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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 inductirl:r)bml 0-)kx6 y icwve 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 1201cafb0kem iv./9j 1gl V AC at a frequency of 20 kHz is appliebf0 i191j/. aeclvgmkd 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 th r;h8kw+/f8dy f4 oe nni1;wydrough 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 reactancz6zow0vh) ln9 e of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of ca44* scb76jjawf 2nwetagw /s, pacitive 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 doesd4z-4m,h+7k( -az tvu1qyrsefrm dj( a 10-mF capacitor 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 capacitive reactance of a 0.010-mF capacit5)yi( bc5f zxxa*gy j-vhkl ,*or be 100 W?xxzb(5i*k5gl-chv f,y*a y j)

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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 capa .vxh2hsq .m6gcyvs 1 s+xor1:citor 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 12.0p-u5f :d( - mgc-/pcxl4hbr rz W resistance, 15.0 W inductcbp r-5fg4z-(:cdl -ph/ muxrive reactance, 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-W resistor, 20-mH cswek/eqw0 73c5 oxy5t1zaf+ eoil, and 1.0-mF capacitor are connecayw + oq/5xwz7es1k0 tec5 3feted 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-kyu j8zjk 4e4(vw16sdmF capacitor are connected in series48k( k jj4wvye6sud1z ?

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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 a84*alxdocc1 r 20-mH inductor, what is the imped4c8cda *x1 rloance 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 seriesqn -ua91 .1)pkl tahay with a 20-mH inductor, what is the phase angle a l1. )pa1n k-hu9tyaqat 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 w*v5n6 /qf+plmjt2 lnrsq7+jio 0iw f) ith a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 ql njtj*mvpi+ irl7fq 0w/)2n+sf56oW 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 capacita)qxt( jvy qv0q4+ 6a6+pe s1mily x3vrnces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110l y43eq+p6qij 0a1xxqy (vmr) +vv s6t 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 serieuxz -- ;trg7rtt +lkdd;q1q4bs with a 450-mH inductor at 5000 Hz for a tott; q-+udx4zqlb -r dtt7kg; r1al 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 resistor at 1.0-MHz for b g3wro/m3ddbhgl 067a total imped/ gbdo bg0mhl63w 7d3rance 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 q c+c:m -0 ccwu.0xzwhin series with a 20-mF capacitor. What is the impedance at 1000 Hzuqx.+:w0c -h0 cwccmz?

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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 1ja; f pos69c23m8ib om.0 kHz for a total impedancp s9 83oimmj f;bo62ace of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor atp:a -qxo rx-;o/ajf z*fe pt.9 1.0 kHz for a phase angt;zr:9qf-px *ao/xoe .p-a jf le of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1dcyy +6v ;ioti a4t4(x.0 kHz for a total imped4x;yo6t(ad+v ycit 4i ance 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 seria;uf +n,z*nw 1xo8nq (uln8y.bt8 uaies with a 100-mF capacitor at 120 Hz. What is the phaseo fu iy,w.aq*8 8b ; ua(zunn8x1n+ntl 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 a5p,u 2-q1a8cns1vs7iekgbdkv i,.rpaqb ,:g 100-W resistor, 20-mH coil, and 1.0-mF capacitor a1a,cdrs8,p n, kegvki:p 2q.1a i7 sgb-v5 qubre connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a *uw ud*1d q;do100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuitwo d1*;*d uudq?

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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 Wy(vwo4ykma/z(0 w ua/, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance auyawv0/mz4/k (o(y w 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contai5dev.av6 fca (ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppec .6(davf5avly?

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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 ser6gv2ww( 4i p sntll-:t :o10punfei-qies with a 500-W resistor for a phase angle of -l lp:egn1vntop2i (qi4w-f: swt6u0$40^{\circ}$ 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-mc,xf 8f jcsk,6ze9 is7H, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dr8ki zfse ,6fxc7c ,s9jiving 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 with0vzn1i k363)airi jsl 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a vr61 s 3z0ii3ikjla) n120-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 anl-c z)qys rdy;0d: -uc AC 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 resij k:s c0bm xx4sbk6/4istance of 30 W. What is c6mb :ik44 sb0s /xjkxthe 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 factor for/d-,atgp:kjfa*x;af gj f *4p a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whekax jg*; *p,tfda :f/p-fa4g jn 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 coilnh)vpz)rh 1o7 r aa,;e in series?,h)rz1 eo7pana )vh;r

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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 resonant fkwna ; r91+e/fh fqg)amnr1p7 requency of kep; 1m)/faa g+h9 n1wnfrrq710 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 resonant*r)jezv 9 )m4loist - tqx;8.1ih ehdd frequency of 1000 Hzv ddeh i-t1erlh)otm4q9szi*); x8.j ?

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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 ba a);cgq ,farn 0 uqd)*x2rko7e placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz,r0c rqnd af *k;gx)oa)q27au?

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