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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://autoconfig.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://autoconfig.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 gn )qgxc n*jp9c kv: 0wxv,d8b* b8pv,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 induct(h) q6l ,q:m vlhscmu.ion 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 lr191 9f,-nuvk vkk9nhz5wij wire in a coil produces what kind of change on the w, 99n z5kkjvki1- f9vrlhu1 ninduced $emf$, 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 ncw 0l/e k3y,uof wire produces what kind of change on the induc/cn u 0k,yw3eled $emf$, 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 of chan p k:)fqu;pzx plg,9,l6g4hyk ge on the induced:qkhz g9 f, l;kpupl)xyg6,4 p $emf$, 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 fle8i*kh vj7b-zss41eg uv24 grom 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 directiow8x mcjojhkevkg,5be) ;;91 0d xd ir/n of an induced current in a conductor will be that whicgw;xvcbx50dk/ o;e 9j m)1ie, 8hdkrjh tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fla0o ax87+ehdpeo* t qd4t on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet ind07t da*8+ee poqdo 4xhuces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is he83gfx3 h; rufrld above its center with its north pole pointing down, and released. As it ahru;3 f3r8f gxpproaches 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 4c + pfs knyak0xtp3;9a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thip;y sfaxck k403p9t+ns 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 fieldc vlg) e5- * cg8u,tsrsv+oc1h vector pc)+og stu 8vc-g c1v,s5lre*hoints 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 in a y,dy2 r cab64)sok;pb region where the magnetic field points straight down. The magnetic field disappears suddenly. When 6kb 4oy p;r2d,ayc)sbviewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table anzl2(kfw;viv rp5 7n.wd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed 5vwpki;l 2.(znwrvf7 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 lo8*3hqig l 6earop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fr8i l3*hqeg6a rom 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 b h a:ua+-4fl3i4d (ixlm ul0mabout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what midf4ib03-hla+ l xumu: lm(a 4ust 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 cubui+ )m58v m (wq1oieonstant angular speed about an axis whose direction can be varied. In a region where a unii85eow(m)+ u bium 1qvform 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.5zptzon : 6p9hfmz8w.
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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 thspve. acwqrna0 :x7z dd,/t7. at 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 magnetaq oy;fs9c xw,bgi:opo) kg58c. 25jeic field. 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-wes ,+x*cpiwl1m ve0m 5db e/9btdt direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across theix1vwd /5lbmbpt0+,* m9 d cee 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 o 37tbm5c/i+aa +7qjn:acqo lat 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 generatokcaij6k:is , 7 ;rpz*ur 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 revolutions f0 xo jc;o l4( z5y*ezr9f8(ih uj5lczeach second. The frequency of tz0jh5(8 o orz(u9xzeycc;5*li lj4 ffhe $emf$ 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 usea /gv cy3pn9: c5wzp+exkh, d;d 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 device th7 v1c m2n;rgohat

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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 sev :pnkcs5) nu 0fo;(chcondary coil contains more loops than the primary coil then 5vu:cs ;nh 0()nocf kpit 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, ifmon h*( . k;tq90h10ccrm rmxp the primary coil contains more loops than the secondary coil then it itp.m rqr0cx*hnk1m ;9om0(h cs 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 i5y qx+l.bjl 01ue-m/r/ tgmf 0 -vwcxenput

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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 resona/gc 9ywn0i4 aynt 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 inductor are connected in series to an ity m yr;:dauy6s.jyc-qr(,f0 / et io0deal battery of constant terminal voltage. At the moment contact is made witu/y,jtyerf .y0qo:6 d;0r (-yciasmth 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 in p njid9h-:diaq+w/g2ductor are connected in series to an ideal battery of constant terminal vo: djp/g-qwih 9a i+2dnltage. 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 conn5h:ps*a yk 2v*csy 6:7uj nvfiected 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 inducqr/pl- )rc1lype6ae ; tance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a b a) ry qgehbr*:yl4r k)l7g.h8attery. The time constant for the circuit represents thrrby e.glk h*al q7)yr4hg):8 e 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 battery. The batd w sb;cfi c0nc2)8y0ntery is suddenly removed from the circuit. The time consta y8nf)00cwsc bnci2;dnt 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 thet8w+h/) jkx1 r -otid1yw k7zi same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this h:g0 8 ufd)wtecircuit, 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 connecty1eb bzr(2 txh)u7t ,ged to an AC power supply. In this circuit, the currenh 2b7r txbeut1),zyg(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 ciq q0i;qfg /9zyrcuit changes by what factor when the frequency is tripqqg9 yiq0 /fz;led?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is d3-j0aq gx bems8fd(: uoubled, the inductive reactance of that fm0(3gd8b-uxjq ae:s 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 i)p;mk m,de ly4nductor approaches zero, the induc mdmk,; )yepl4tive 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 supply. In this ci4(c8(dzcm /lylu 3ba)ttohr2rcuit, the currenctmbh8 d2auzl/c3y (tlro( 4 )t

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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 circui-y4mn (i4wlx c tn;9hut changes by what factor when the frequency isw;4hcm- (u4t 9lnn yix tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero,3mh-4/w;h r4l4 7ec9ndadq mo 0iviapxz. b b) the capacitive reactance0l n4cbwb4x) .r ;7ah-vieq9o hmddp3a z 4/mi 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 voltagesc t)ue:5pgm sdnc8m apfv n109i5gk-1 of the inductor and capacitor in a RLC series circuit?g u5n5:vnme1ca0 81c)ks i9 g pdp-tmf

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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 xbq53s2cvx 14k pirq; 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 circevypclzp)e o6 b4-.m;uit increases if R increases. When is thie4bz6yvp )-pm.oe;c l s statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ihcecgw6sy6 32qch r -)xvmo59cp:bm0f $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cu0i7*+jxh tmhircuit 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 iz5vnk9k rt 9o;oh/y-7(b mii double in an LRC series circuit, the resonant frequency of that (no-/9m9;i krzv itb 7ihyok5 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 u0 (tt 1 :69*+kpprx5 ujqh;bdijskljresonance,

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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 circulve)0jzjs i5t987e vhit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieldaxm i4tn/48xbme .hv3dl3 n4i of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are n4/ .mb3mvi 4hxdx l8i4e3tn aparallel.

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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 magnetic field of 0.2-o6t;ib-fjrg 0 T. Find the magnetic flutgoj;- -f r6ibx 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 in a uniform magnetic field okidn) 9,czmx68pcn4o o0zr 8v f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at 0zc o)p, 6zx8 8mncnrkiod 94van 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 adjxylxor-+a22ue ua2q q8p x .17amo:hkustable 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 channbjk- h8q3 i4ages 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 on7hv .y5i p5.vwjd,l bc a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induce.yw. 7,5cb5pv v jilhdd $emf$.

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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 witop/zabpa8 o7n86z py4 ;jbqm *h 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 anbqbz, ,+a56ljb-ebm w d 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 hor pz(4zacpz5o8 izontally at a location where the downward component of the Ec(ap5 zzz4p8o arth'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 q: c xrpg4mf8cr p0b.i3k4k,rm long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throrcpb3mr:ckk4r4g i,f x8 pq .0ugh 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 uxo i,9)uj 91ydgcea gl/,ne1cross-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 oy8loqj 26a*hs:*m 5 aj c7vbbhf 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 ol1rt duh9a pt(6p/cv;n its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magneti/c(t9at;h1p ur plv 6dc 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 1*+t+ho z+y29myp ba1 iz.riil00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a sim v;wlu.c0 b;nae cvb0)v8f*xpple AC generator with an output of 12 V maximum when rota cwv80fn xvcvb0eua;b).;pl*ted at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wi egc/, m;ag7gfth 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 o5t bhus.u j (w79i0l:jkmmewl-15/izs f * sbwperates 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 motorlc1-z ngd q;.a operates on 120 V AC, and nd qgl-;zc. a1when running 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 resistance*a.rfh ; :9wagf vrs5k 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whaar9f:fk *v;. hwag5rs t is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thbr 3*cb2sdg6 g x4o+u*8(rxxmtfg2yue operating current is 1.0 A at full speed. What+b2(ufo 6sur4mxg*cxr 8xtg* d2y gb3 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 power su:6ec88d je+1lctcc xaq*65 kb/labsrpply. The operating current is 1.0 A at full speedecrj 8tb6x8lc+e qa:d5/lsb c6ak c1 *. 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 iav )xh :(ti7was needed 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-* caui ps*(n14 A to flow in the secondary. How many turns are in the seconpw-*sn( uc ia*dary?

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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-rs9aot(+1pl/ jyqz 6pqcmw/ 110-V primary if the 24-V seccswr/(6p+j9m oz /qq a1 yptl-ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary conb- rs3nep58;9x xoamil. If the currx ra8nm- ox5p;3 b9nesent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in r u b3lma 24 1,c:hdxs,tpa:/(kgyw wxthe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in thx( pwbc xg/lm,,ryt ::us314adkw 2ahe 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. g8g-2 1tchr3br7 qq byThe primary coil operg8 bh2t7q-ybrrq 13c gates 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 tur/g5-kr6ytfff+ ( . c dirhtc)uns on its primary coil and 300 turns on its secondary coil. If 120 Vt d. tryc-frffk/5)(c6 uhig+ 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 primary coix) ekp9 1l8( cphyudy4l and 300 turns on its secon1cx9edy y(hp ) l84kupdary coil. If 120 V 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 transfor ia1ebz) t-zf9mer has 100 turns and its secondary has 200 turns. If the input curref19b zt-i)aez nt 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 transfxj wj b9;j)5wyormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect thjj 95xyw)jw b;e output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20z+x,ba,ct ;ao0 turns. If the power input to the primary is 100 W, we can expect the otzb +,c aax,;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 voltage is w0 fb,l2z3hdkz+sqc)4ck)a n usually stepped up to 4500 V by a transformer and transmitted throul)hw4,qk ) cfz sbza2 0+dcn3kgh 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 c(ol; jm3a5mlpv6:fgzny gvq. 4 d6bt -urrent 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 percp y3 - lgld5 t6ba4:v zv(.ognm;mqj6fentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12k ybd7 z80hdldd:z5is 1 u*tf/0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throubsfkul*7/yd dhz58 zi0 1 d:tdgh 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 liht m, -q;+jczcne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In ordeh ccz+m;qjt,-r 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 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 resistance of 0.60 W. A gewxvm 6 nl)l:.bnerator producesn . 6:vl)mxwbl 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much les/0eous i, 3urzg7ge 3hs power would be lost if the power were ,/usgur37eo0 hez3g i 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. r,,vjjv fm5*z It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stem* frv,v,zjj5pped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a currentg vlsx2m59)l)) rth yb of 5.0 A. How much energy is stored in the coil's magnetic fiel s2h))l 9v gt)rxyl5mbd?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W res q dr)l2j2 navu7**mxsistor and an 18-H inductor. What is this circui2j7n *sq 2xrl)daumv* t'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 rms voltage is 120 V?zl b x0t,.0has

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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 )9p -e5 ;1fze fud*bz n: njdzzhztt40into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 9gh 2ea.rv5ss120-V AC outlet. What is the resistance of the lampsh r 92e5g.avs?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak curij x8kkdhp1-k rv+ 5 gt7feu-,24s sshrent through the resistorsi ,- kuhf17g2k-v8h+p4s t s5xjdekr?

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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 to8 ztu8yxcq :7v a 120-V ac power supply. What is the power dissipated in the rex:vz8 yt c8q7usistor?

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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 dv8l2wfy w )6n.eeme 84x rmsd*bn2i+50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W re+nwkr0pzr0okx )7t v )sistor 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 r t.jxs/vp rp)*esistor 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 indu*yd7scif ;5bs ctor 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 reactanceh,lvo15+c1)by t*5i os yn qph 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 inductive re,8w x dxeu.m/le z;0kxzhg 4m(actance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 100z-) q fqt82g9c 5ieoo1i(pw 9j7luljz0 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 induq(d qxgb;tq 5 bpc(d0k,j8 5xz8) dujfctor when 120 V AC at a frequency of 20 kHz is appliec)8pz0d,qdjd5fj8 tuqqb;xg5( b k x( d 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 t8jp+ p byz6cheos(4p :hrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a:i mv cj.ygv8* 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 .k erpq4p8brgsa n3;4have 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 capfvclx qds,b5:zf6 g 7/acitor 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 reactl7peno zo83wqa x6hx ) na321vance of a 0.010-mF capacitor be 100 W?n2oz 6vw3oa7xqap x8l n13) eh

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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 capac;+ a4 +r;axn*), qj srxkps*53pzdjw(oxdniw itor 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 impedancr6-wxr.z .er te of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W ca-.6rrtxe.wrz pacitive 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 Hz2yhq:+o ocaoe:t; ns, if a 100-W resistor, 20-mH coil, and 1.0-mF caa2+:qceot; os:on h ,ypacitor are connected 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-mv iglp7jjarn;r96ec rcqg2 7*lpc+ 2:F capacitor ara2jj g+grr9cr77cv; qcp6 :2nil l*pee connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected injh2lhm.te.l8 8kf,y( xf 9ytk series with a 20-mH inductor, what is the i,j elkyhfm.y8f8x ht2k9t l. (mpedance 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 s o4u)(eq xheq /i-cy-( 8zuftjeries with a 20-mH inductor, what is the phase anglf(iet z/hq ouec-) -4(8xjyuqe 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 circuit8pqqnez rt(04ixgy7y n 328kt with a 20-mH coil and 1.0-mF capacitor for a totxqp ky3yr0z28g8 4ient(qt 7n al 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 can1m2 + :eb eiq/cfwte3pacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance o: ee2f1i 3nq+me/tw bcf 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 4a:54qds t17g +0qusdmf f7fak50-mH inductor at 5000 Hz for a total impedance of 40000a4sam7fu71 q s fq:5fdtdk+g0 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 jrycr5z/mf i7 k0tt5. put in series with a 100-kW resistor at 1.0-MHz for a total imr5it0 z5 mrk7.f jt/ycpedance 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 s:k(q ws0swyw4n/ 4gf /pb lue5-dsy1o eries with a 20-mF capacitor. What is the impedaw41 dqf(-upowkn/50:ye 4lbss/ygs wnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kH2 h; v+lp2yvv)r,d7jau 9xe hfz for a total impedaav,h)vp7j9xe h+ud2r l yfv;2nce 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 capjv.avh-q+ :tjlnh *xb1qq) v 6acitor at 1.0 kHz for a phase angl)-jbq :xnhq.*aqh t16v+ vljve 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 1.0 kHz xp*1.oht,idf ai0e l .for a total hxti.a ,d e l*o.ip0f1impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capac -,a xpri i9eup9nk5r+itor at 120 Hz. What is the phase angler+i5 kx9p-i9,rapu en?

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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 resistov/ nlcf5t2le / dep*/tr, 20-mH coil, and 1.0-mF capacitor are vn5 t / /defclt2*elp/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 consic*cfzbh .j2; dtxx/(ssts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H tfc jx d/.;sxhz* (2cbinductor. The circuit 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 capaci:qe r(y iikw*9tive reactance 30 W, and an inductor of inductive rea ike9q:i(* ywrctance 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 serie i32i; jrcsvfv8tp+:i s RLC circuit containing a 50-W resistor, a 10-mF vi f 8s+crvtjii3;p2:capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase(2ia.2f zgb05l-kvevrpli 3 lo*bzj( angle of*j epzbr 5-lii l.g2z(f ( 3lboak20vv $40^{\circ}$ 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, Clzigpd4/j7n89 v.eaono/ j m7 = 10.0 mF. At what frequency shou7.iv4z97p /olad /mjnej8g nold 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 an ac series circuit with 12.0 W ib(dn ,jiv -.zresistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit b(z .iv- nij,dis connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circu iu4l4kd6(wcu booy /:it 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 fxu+qar .u9j drc(:4o a resistance of 30 W. What is the power factor?r frcq xd4ja+.ou(u9:

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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 c9valww0mk/c4q m nf2 * v33dduircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poncw dmvwa3l fk0qu*/d 42m39vwer 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 capacit+ 7k1jn6fgmyfx5pj 5s or and a 15-mH coil in series?fpx+7 5fj k5njm 6gs1y

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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 ak7 c :lw1t0lir 4.7-mF capacitor for a resonant frequency of 1 1:il7 wckrtl00 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 res f j6vr)9(vc:rpt0es ho ut-5sonant frequencyet( r5rvt)oh:vusjp0-fc 96 s of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placenl(93*oi(tg9bximaw d in series with a 30-W resistor and a 40-mH coil if the resion9 t x*igw(ba39(lmonant frequency of the circuit is to be 1000 Hz?

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