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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 followingypd c2*y5f s3x 4 5d1w;larxos are units 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 induction states that/xf,al 8skl5azvs5 ci)* 9cuh 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 *eykeb(w* 6 j*r6s11 uszkhoi a coil produces what kind of change on the induces16(ikkjb * we rz 6ou1*s*ehyd $emf$, 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 m(r fn+7o9zrhj d2xw8+gxi4 yfagnetic field through a loop of wire produces what kind of channwfy+4h (2xd97 zi + g8rjrxfoge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind o vu*r3 bl;n .z ktkkpjed++,:rf change on the inducrke+ n, :dkvz3k.bt;julp+*r ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an:fkwb 3*e;ec:a 2koi2mk u bn; $emf$ 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 condu:tl2 h9rhr 0wbctor will be that which tends to produce which of t2bhhwl r9r 0t:he 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. hhxpua9tn- w40eyc0+2 rr4r hA bar magnet is held above its cey4x-0rncer +ph t29 4 ur0hhwanter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnen 9 n2ipmkdr26t is held above its center with its north pole pointing down, and released. As it approaches the coil, tr nidk9 mn622phe falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic n/qy0m 0mp2 j xb4rirh.ecoj0:q8 q, dfield vector points straight up. The mndj ,:ob.0pi q0hq0c4/r2 x mrmye8jqagnetic 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 fie luk3wjzl 77-vld vector points straight up. Thezvw 3u77-jkl l 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 horizontalh0f g nwnj2* lo4(. fgocz)t6o table top in a region where the magnetic field point4 )oz(jon6owh2*g0 gc tfl.fn s straight down. The magnetic field disappears suddenly. When viewed 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 anda 0fn657prs.sc7 z p cflbkqi/:,++nwzqp 7gr carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. W 6 ss+7ffp0czrnqq nci +z7pbp5/lkag7wr,.:hen viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fiik8z zf9so8tj*dp; 5 orst. As the north pol9i8z *oj ;o5tdzp skf8e enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axlh,m7 wf8inch+ ; 3rc)eq v,pois whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if t;8c lhfrw7h 3mco n, p)e,+viqhe 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 whl y .7h:om)kjd0*v jwoose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientationd.m :j7 kl)0hjwooy* v 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.id- k0 d8ps7/4fb xmn4qdupnbq3y 4e5
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that ac+yf,5 *p9oy lwlq4d( u,rtq wn $emf$ 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 fih1 v0c.varxf2eld. 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 (oriente iiqvpcy;(r,j pz:,g/ d in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodr p(q,jyvi/zpi,g :;c.

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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 hi9g*pq7fy,s 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 generator tr.ea4ustv 4w 6z67x0vt bom-:rfqj) eqansforms

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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 throub.rfums1j3) sw g0)vvgh 60 revolutions each second. The frequency of them0r )gwvsbfvu3)sj . 1 $emf$ 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 devic 0kgaqx 4pj8*tjmf1m 3e used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device that/r4m4nnb6k m.drigh i. e e(*e

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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 mo*3 6togud;p4l6v8a ys : cds( srqrhp2re loops than the primary cois: qrspv8tlc2pyr 4gs h;u66 (doa 3*dl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secouib.oihv61) bndary coil then it is6b 1o)b .ivhui 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, th+pn eyf eao,50e power 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 resonaih+ (r/ch1 tient 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 ttvv(yplz ,k4+ o an ideal battery of constant terminal voltage. At the moment contact is made with the y+,v(pkvt zl4 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 connected9i krr.( 2),o4bxwlgltpjzi 3ww7 9j p in series to an ideal battery of constant terminal voltage. At the moment contact is made with the2rt7pwz w4,x .9(jgi kljibr)9lpwo3 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 inductanamje0u+ct6bmp.g jm8i3 s9*h3 dcs4 e ce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecmswtp sc01wm4sghu gc94 ).4db7e/t tted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ti 6g6j07j, lxmtp(u2h/agv ineme constant for the circuit represents the time required for 7mh/v ggj(ue ip0ajnx,l2t66 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 vzyqndz ,z13on 5s9d zw2 ;sa;to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curr2;,zs sanq3y9 zdw; dvo1zzn5ent 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 same units i,/s04tom ho0gp ,m gtexcept:

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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 fxr ,zkm) 4vm.AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cir;ogt7,+; eglzjl mm 8hcuit, the current; l;m,oe hjm+zg 8tg7l

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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 when t/ wx*sw8q6 -kn9nqaiv :4 q v-snij,cthe frequencxn6:i,/c n-in 8vjq4kstqvq-w s wa9* y 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 voltajd9wrz0fv- gq, ; 1dvuge across an inductor is doubled, the inductive reactance of rq,fvg910z ;-wjdudvthat 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 acros aoda( g8k8p/js an inductor approaches zero, the inductive reactance of d( ka p8jgoa/8that 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 circuitj33 tsjbifuyy;;8joc f 7ip:2 , the curreu fy;27tjcs;i3j8ob :fjyi p3nt

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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 vhn,o 6: wp2ddchanges by what factor when the frequency is6od:w pdhv, n2 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, the cap vvzbc.98e0ggrb8 bq.acitive reactance of that capaci bvrc9v ebgqg.b0.z8 8tor

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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 indsrgw s 3splc/7 ,n+k.nuctor and capacitor in a RLC series ci7nwn +3/ clpr ks.g,ssrcuit?

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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 circui 9mz)iui d-z/ah ykh-;t 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 circuit ind scg(,3zgc h (0vlgg;creases if R increases. When is this statement trug0,zc cg3g sl;dv(h(ge?

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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 incre++q4q44adijj .o+ hwpt5q ode ases 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 cdid )1 qd9k31 ew*xztzircuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both2nw dzuf wblsp3:o .j+e :fw93 double in an LRC series circuit, the resonant frequency of that lf3pw9+3:b:df .nu jz2 wesow 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 voltans s:;1f9rzmk2 mqu e0ge. 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 circuitl*h noe:)mge5al +zxw w7 )/at 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 radiusc16,g fy c3lui 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whegy3u 6ci,cf1 ln 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 magnetic field wrnxsv(n2 z0sd:3c /f n(bl b6of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpefd : s6n zwlb3snbr(/nc20(xvndicular.

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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 of 0. j7*8+ u m*pb2g6ri-3x kingtayq3asq20 T. Find the magnetic flux through the loop when the qn6 + x*rska7ya tp 8ug-i3j2*bi3mqgplane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of 2jw) +js+3bj(i+ wrjezielv) an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes frlo x foe,93p+lom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 6gmfeqd.8v; y q6bux) 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 v 6; yqg6u8d)m.beqxfof 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 aqc .o:aa6gsogpm+g+ g)v .* vmrea 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 area ha cfnbkg*.9)$0.20 \; m^{2}$ 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 horiz )zu;o ju7/wxlontally at a location where the downward com/uul )z7j xo;wponent 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 ay2qm4 129nebw gay 5nangular velocity of 2.0 rad/s about a e mn92y 2n5waaqg 41byvertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a croyrs3 l7aat,bm47q ) 50btkvuoc+wi*fss-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 consingiabfjj /0v.ty/y q+eh 0t - 99;oypists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 armaturittri2/t 5 o :c-brye6e. 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 may:2ieir5/r-t 6tob t cgnetic 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 100xq-c f pe2q flqle8,-7 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an o xp4.ipjz3a:ciq(a l3utput of 12 V maximum when rotated at 60 Hz. A magnetic field o:ipzq34ij xc (l .a3apf 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 (t1,,jl) s:xae hm zilgenerator 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 oq;c lmp- yo j5xs65irr 1n8f9la gv:a*f 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a t3xesgmt tg/ no5c06jg ohy,89rb5/eresistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a backy6ggsj,g/th x n3rtm/5 5 e eo0bt8o9c $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecn9;,v 26mn7rscrn r(w7 cktg u3si em+ted to a 24-V power supply. The operating current ism29e cgnik c77 r n;t+w3snrvrs6m,u( 1.0 A. What 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 supplyq-w6hn.0 vuur. The operating current is 1.0 A at full speed. What is the b h 6u0wn-r.uvqack $emf$ 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 intern:/i+gknj u0tx al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whatx:itj+ ug0/nk 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 need nf/h 38o7xoxfg g/nf,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 14 A to flow in 7z z0dzatlzecm g0 30c7 .xd:zthe secondary. How many turns are in lz7c.zdx0zt:37c0zze 0d agmthe 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 k)kp46 cak3z zw b.se72ay (uvnecessary in a 110-V primary if the 24-V secondary has 1 k a46bc.23yv7ezk(wsp)ukza 00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consis8-nz ra5anyf /ts of a 500-turn primary coil and a 2000-turn secondary coil. If the current anyza-8 r5f n/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 the primary of a transformer. Assuu* f5.x*kd /hphf1wqaming 100% efficiency, how many amps . h* 1qk5 *fxphdfw/uaat 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign l)6xbag*bo/nby4 / 3 jzhj w)gtransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What3)/a b)z*4gw/6 lohn bybjgxj does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on it8r/cvc eyaoll,1 v/7 ns primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present ioc/nlvc/ l1yer 8, a7vn 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 onbre- 6mlqqnf( b.-7rw its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cur(bbw76r-me r .nflqq-rent 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 secdus ;( fv:x6cj9j ;kfrondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currexcf6;:f jk ; rsuj9vd(nt 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 tur;z efxit:bi:6;ld1kins. If the input voltage to the primary is 100 V, we can expect the output voltage fkii1;:tb6xel:; dz iof 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 tubn4o-mbm6q. frns and its secondary has 200 turns. If the power input to the primary is 1on-mfb6 4 m.qb00 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. Thev97. v*;yatp2 alskowvna*rn-k:;vw voltage is usually stepped up to 4500 V by a transformer and transmitted through a power ks*9p vv.n;- *7o2a ka:wlvw a nvtry;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.)oe kb20i*2sc7 ;faxkauryp,: ra(cq The voltage is usually stepped up to 4500 V by a transformer and transmitted tya;(0r7o2fpcsecibr 2* ,ua)x:kqak hrough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 jgl1o pb;,f) kurje+- V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a poweru)jgkopbf,;1 jl +- er line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a t0gp:q a7 evr7potal resistance of 0.60 W. A generator produces 100 V at 70 A. In order p 7r:ga0v e7pqto 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 t7ol ff,fg+9 tlong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transfof7 ff, t+o9tglrmer 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 do;c al1u3oabw1v;t9/oeaz nu .wn a 6-W line at 1000 V. How much less power would be lost if the power were tra/1 eoo9u w3aa;acbtzu. v n1;lnsmitted 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 i 2l 4 /txhr(f(bxso3y440 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 transformer if the power loss in transmission is not to exceed 0.010% o (s 3fhtibx 4lr/yo2(xf the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.* xkrhtlfhte+3tg3 (y qja,.b /6w jj80 A. How much energy is stored in the coil's magnettltj8hkt6*jj3q,( gh3rewb .+xf y a/ic 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 contains a 6.0-W resistor and an 18-H inductmlg(y+uklbir1nr/xh v5 s2 0)or. What is this circuit's timex5+/n vlm b0yu (rl1ks2rh)ig 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 voltamd5ehwjk+r6e,* a x3 qge in an AC circuit 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-Vxyhsq:o9ui1pgi/w4/ h+ 3b ty 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 ajz//ejlyzqku..g w,7t z -5pe 120-V AC outlet. What is the resistance of the lamp?e/e7 uz.zkjt/qz pyw,5l-g .j

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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 powrd /l c(oyen:pi8sz:-er supply. What is the peak current thror:yzl/ 8dp-es:icn o(ugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power suyuv1a91r 8y(7cxs)ctkp vm6 vpply. What is the power dissipated psyv7 6) u vat1(v9ckrx81cmyin 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 resistor i m1 9kgf0fdp:rs $I = 0.80 \sin (240 t)$. 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 resisto6j6u,ke xvihose30 l 4r 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-(wcac-yoa d*ryot/ w-is-)5t W resistor 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 w pg3m+rp ta.z*4z 7r*dwx8nw60 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 rea kgz3w-gb0 r j5m/y(p aa1)ywlctance 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 iwjfe 7 nzhvpg)28 (gs2nductive 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 15ig20 ec:;g h qimf;z5c dn6*dy7 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHxvlbomd7 (3z z/,awa3z is a(7vaxdw,b/moz3lz 3 applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60 1bz,w:mqcttm2i kuwi(*k.: l.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capac-i qtq pa+ 28( gp3aybqikph)4itor 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 capacitive reyoes unt;b288qr4 *a )fzh- qyactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor h ;+vnk8pw pa0uz :u/jiave 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 reactfidd lwxso-(d04 qr -(ance of a 0.010-mF capacitor be 100 W(4s- xqlworif- 0ddd (?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 q4n 2xqx-ha yn7(z p)gHz 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 ci l ; q ,wbd/bgjihrgy+63het1-rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive jh, b ri-w;h31 t6lydeb+g/qg 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-mHaut5vw qfo t)4c8xns ino)hd 5)r9:6h coil, and 1.0-mF capacitor arc4o5tv wr:8sd tu niqh)of)h95x an6)e 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 coivk4- fpfn7 m-s*8 )phsgrzgn 1l, and 1.0-mF capfv 1m-s7fz4psn)r* kn- gp 8ghacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wi)csgq6rh2+yq k. o i1tth a 20-mH inductor, what is the impedan6oq1 ciqh kts+)g yr2.ce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH frf q:lg:ssmscx)*m153j o b9inductor, what is the phase angle )mlxcs *3os5ms f91 gfb::jrq 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 a )/k+)qsllvo k7ab9o j/) kqhx otx w1:20-mH coil and 1.0-mF capacitor :j)1oab+ h )qkswlk9x7q kx /v/)oto lfor a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wiqg og q5*r:jzhz4 uv*+th a 100-W resistor and 15-mH coil to get a tot5 z* q4hjgzvuqo+:g* ral 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 series bcu3 n1,5hd-uua8i .shm eiw9 with a 450-mH inductor at 5000 Hz for a total impedance of 4000s 5.uuhanh 8bcedi1 m ,9uw3-i0 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 withudvhnd9,v95wh gqzk 9,xmu+, a 100-kW resistor at 1.0-MHz for a total impedance of v,uw ,h m9h5kvxqg n,+d 9d9uz150 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. qtxue4 bt7x- r+*)7gs g6vafgWhat is the impedance at 1000 tg br*) uvtf -47+xe6sx7gag qHz?

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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-m sn0 gusz7qn9-rr+hs/*:ky cqF capacitor at 1.0 kHz for a total impedance of 45 W + *sycrkh:/ nqrsu-szq 9n07g?

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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 aw7hj cx+ s1.hc4794jteelex q 10-mF capacitor at 1.0 kHz for a phase angle o+s4jl eexwc.9j 7txhec 1 h74qf $40^{\circ}$?

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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 seru 1w*jtgso 0 efi 4 gs1rp3*o0n7.tzicies with a 30-W resistor at 1.0 kHz for a totalfewc0s71 iz op 01*.4*s3rit gtongju impedance 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 capacitor at 120 Hz. What is the p.mf9 5jrgm.e0s dnc a4han.f9 .cmdes 5j4r 0gmase 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 100wr; fhgmblvf089*q n.-W resistor, 20-mH coil, and 1.0-mF l;98rhb0m *.ff gqnvwcapacitor are 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 100-W resistor, a 10.0-mF capaczo-n/.j 8.hcx;dm y-om4hmjx itor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz pm8-njhxo /y.4m. ;om-x h dzjcower 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 o 0x mm,k:ano7gf capacitive reactance 30 W, and an inductor of inductive reactance ,mgko7ma nx0: 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 RLC6r9mqn g )tzrb :b97abtd3ra9bsm96 o circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tg qrr6 9 zm9ma7sdn)t:r939bb bat6bo o 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 ah-s fip d)+rf,n0dj9rngle o jf)if,9hndd-rsp +r 0f $40^{\circ}$ 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 otnup4rzk)5(n2o ,rr8bvj,m q1 g :nshas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven i 2vr1p(nzb:ntjng rmo4q 5, ,o)skr8 un 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 resistance, 15.0 W s8(njmbupwliwc8g 4m.a/ e(+inductive reactance, and 10.0 W capaciti4ac(wm8. + igj un m(w/epl8bsve reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitg .vgsua+ n7c; 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 oxhuwcb+jcb:+ i8fp42 l/6twcpk y*9 xf 30 W. What is the powe6cwjlbwkut8y 4*p b ixc9f/x+h:cp+ 2r factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-wll.btydd ld2 zp.bi 845x+:m W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?i+ .ltwd 82zbbm45d xyl.dp:l

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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 fm1 /ei98cgj-6yotpbu 4e-qg hrequency of a 1.0-mF capacitor and a 15-mH coil in series?j1bu4ctq9im6ey/ p h -geog8-

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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 seriesq/vwv,6*/ u i .i jkie wn5faqzr(5q,u with a 4.7-mF capacitor for a resonant freque i./nqqu*i(e5zwujk /r v i,,vfq5aw6 ncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inducth ktt1hya**(izftb+9or for a resonant frequency of 1000 Hz?fh+b kt9i yt1(tazh**

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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 30c/mr ,4449lpuuknh d vevx:9z-W resistor and a 40-mH coil if the resonant frequency of the cir pvul4m,n e 4zc 9/9uxdk4:hvrcuit is to be 1000 Hz?

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