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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  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 aratyo s5*yxl6) h+vr3; 3 u)hhdj5 xxzye 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 theu8x8m1cfxn;4*- 1gzsji + ufor,tci hfz9: vb $emf$ 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 ink)uk4./dqpkw a coil produces what kind of change on thkk 4.d)pkqu/w e induced $emf$, 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 fielcap p9u xly5br/r+m 6-d through a loop of wire produces what kind of xu6c9rp5a-rl/ b ymp+ change 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 of chan *aj 5 ya9mt-wfaf:l.uge on the induced f-*w ft:maua9 aylj 5.$emf$, 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 aiy) n-xmohewx* ))vr7n $emf$ 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 int/d0 weh dyp9wmnyr/9lmd* m* 5* mk-yduced current in a conductor will y*0mdl/d yt 5 pe- *mh9kdm*myrw/n9w be that which 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 flat on a horizontal table. A g(0xw d l* -zevn-dm4xbar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from above0wlxmn*x-d g d4-evz()

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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 horizo s+fn*pln04go7e3hchxppt1s( v r- ,sntal table. A bar magnet is held above its center with its north pole p xph, *n el-sfp4gtr3 +s(cvnp7s10ho ointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table+ngt b)5c4d3 mw y-s 4zwoy3sm top in a region where the magnetic field vector points straight up. The magnetic fiel o+54mys3 3gwt-cnwzsm4 b)yd d 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 ret0k jzq3 llhcl3rp ) 8wj0z0x/gion where the magnetic field vector points straight up. The magnetic field sj0/jzphqx3zwt3cl8)l0 l kr 0uddenly 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/bnrkzk/(-n g a yj7cl7(/iqe region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what zgqrc7 /(b-/kk an y/j(lni7eis 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 and carries an ever-inc. c/m+nx)yppq7rq pf :.n svt5reasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curren7rp/ + sxnm.tqcnp.p )y qv:5ft 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 t+p*pdbrzvftn m;n5,1hrough a loop of wire with the north pole entering first. As the north pole enters the t5;*p1zdbrvfp m,n+ n 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 axi6m gw4 (jl *u296cgngneek ui2s 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 *w2ke6 6m gujgci2 9egnu( 4lnrotation 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 sp569 n+ikij. mx tviuh1g5q3 wa3ocov*eed about an axis whose direction can be varied. In a region where a uniform magnetic field poi5akuv*vi qg9 x13oojw c365thii+m.nnts 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. vsx9(7xw z 8in763:7 hohnd koiemrh+
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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 aqyht1,) nf cayh5;vd5 n $emf$ 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 magnet2yij )c,zg(p97js mr +**wvvd)np txpic 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-west direction59 :ablf w2sk(tfkbddx ,1dv9) is moved northward at constant velocity through a ma: slf5wb2 fd,d xk(dbtk 199avgnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates2 s a*+gn:qyu-wk l+dfnre.(auuzb(; 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 trqx) tr2 qr+..wrgg; jlcz3q*ransforms

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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 re;b;xo y t04 i6rl6qovyvolutions each second. The frequency of the60tyq; oy x ob6vlr4;i $emf$ 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 d9duz(u, k9ds xevice 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 devi*d:iw v1j9whpce 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, ifawy,e,mxh +w) the secondary coil contains more loops than the primary coil then itwe w) my,hx,+a 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 seconium 7)qxi9kc4 /j3hijdary coil then it ixj7i) c9/ hi4qu3kji ms 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 inptf xasw 0.7i1mut

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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 c 7ww; oi7-/ohsm xuy/hircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery o5/jj jn ;hjitfwrdd/s d; r,-y 0)je3if constant terminal voltage,5h ndwjditej3/);j s yfrdirj; j-0/. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected ineo a,k0gjksx aj96 (*v series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage kax*v,ogk(a 9je0 j s6across 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 connected tvbrd3;4m jt-f) :n,/(crso oudy -lcpo 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 infn5)ow 2iwedu a-j :,hductance 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 battery. The time coqcl-8t**lf x instant for the circuit represents the time q lc*l*-i8txfrequired 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 ind ()nt,44q ub3upwf9m-cvdszty 6wv1cuctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease s4-3v cf,1 pt4n6y( wuz9wbq)umc tvdto

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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 havec 0p2e+ mhj l+.5gihgfh5c7 vo the 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/ ppuhs3o /y1lnyb )d* 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 conkez9ngn1yz i-:, m9ry nected to an AC power supply. In this circuit, the currenz y99kn :,1en-mr yigzt

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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 fa/5axw;zz 7vf zi4 b)xvctor when the frequency is trz)4 ; bxwiz/vxv7fz5 aipled?

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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 ind6n4 6oeis46a-hy +hiuic cii9w:t ud*uctor is doubled, the inductive reactcie4ii iu4uacshyd- o9 t:n*i66+w 6hance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approa4ht20cs4w perybx 3n .ches zero, the inductive reactance of that coehwy3 pnbr 44 x2sct.0il

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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 circuit, thequ2rftv x vv/-/acv+ 3 currex+v3fuv-tc vr /2va /qnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes bgh7na n6u8- lv3(*.mkyirb bmy what factor when the frequency is tripler 6 .aun7-8(blm gyvb*kin mh3d?

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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 g8. /+ +glror5b4ilxah mbde )capacitive reactance ofr ar.8 d5b loml)/beghgix+ +4 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 vo8isb2xz n. :oiltages of the inductor and capacitor in a RLC serixb.i:zi8n2 oses 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 xvigi )(cby+y5of-q+ fbg1zme.m6d8is 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 increases if R2* ems+fqzmb; increases. When is this statement trbmm;qse+ zf*2 ue?

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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 ifho(e.) 1xmz ;bfh+t;jr9j aq q $X_L$ 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 cirdfdn zd)3j 1u:cuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, tw9nn 1 oxwe4lf5hz99the resonant frequency of that circuiw4n5et1wl onz9f99x ht 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 i6r0v 6yz9b0df2 sze/l gd4(cg-ez hehs driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuik 1utashr4b*yf1(49c o i,n 8m/qechsl9 orz(t 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 magnn7toakrylc:rf7qdd(-*dg/ 6*kk6wxetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thkn f dq6orr :lc6-/gkaw*ky(x*7 d dt7e 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 u aah8qis.d-k0 niform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar qkahs.a8- i0de 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 of aljq)fk4 u)safd kiy)t/e:l5qc1zga l,0t4.0.20 T. Find the magnetic flux through4tkq.14ae )z lad)ktyj 0qsf 5:gu,llfc a/) i the loop when the plane 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 an adjustable single loopu/+ ;kbd 4cc02nxjgjd 2k1acc 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 cha k0vekx r0eg)l)tk6g) nges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides l++b:bf tc3l53w6vq9qg6x yglybn . m18 cm. A uniform magnetic fieldf9qm vg5l:.wtx6 bglby+ ny3lc+q3 6b 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 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 wit3,tdvbu fizy.d+8 9p ,g) mtbxh 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 and 6hd y y7*ki+ mw894t obgqtwm7area $0.20 \; m^{2}$ 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 hk0m8a :lhc qjx. goyhr 9.l/,m flies horizontally at a location where the downward cx8rmlh/y:g, kqhco.h.j 09alomponent 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 s hrvku-q3-/n m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a- k3/-qsrvu nh 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 lx,:sm bneb*. wm+- mmuoops 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 conska5o 80b:4i(ivg rt xrxkq;h)ists 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 armature. Each loop is s i1szq/zc -s,12 cm long and 8 cm wide. The armature rotates at 120z,s -s1/ cqszi0 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum 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 oduab5., d ldy;cxr3r(2 zub 8ibg9*am wjr-.m f 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 es1 w6oj 0ut 1+*lltyt5*mfes with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 01u 6ft5le1w *t *ssoyej+lt mT 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 with aoyj pi; h)h1j+qhk9zo l an0 8u*e1zq0 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 res.7h1.9q caffqg dr xw7istance of 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 rhveu)19 jz56v9ow savesistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it9sv6vhoz 1wej)v u9 5a 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 resismlq*i5bhq0qxt8wsd1 /mx-x, tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is-,1 qm w0 q*i5bdsxxm/h8qtlx 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/sk gy.x9 ;kyk resistance 6.0 W is connected to a 24-V power supply. The operating current is / ykx.g;k9sy k1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6-v ck z()as+ymlz5u;s.0 W is connected to a 24-V power supply. The operating m+kc(-z ;su5 ysva) zlcurrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage o6 hbr bsmi) 5/it*k2omf $120 \; V$ 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 kq ,ec3l.zt+ ito flow in the secondary. + ,kztq3ilc.e How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in i+l6.kp9x5brjc dap ocdq-*o 1/i-wr)epz c/a 110-V primary if the 24-V sec 5bwo+- 1dck e.qdr/9xzrpp ljc6 i/*c)apo-iondary 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 andnm2otf/4khp s xr dp6/))n+ym a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the6+r/dk2y/o)mptsn pxhm4 )n f 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 ae.so:m21 k/sy t8srhe transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seco2t /sk:. osheesm1y8rndary?

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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 l+o* 16aklrqb at 10.0 mA. The palr bq+1o *l6krimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnstoo;eqs*c7 /lnipq) 9/ c qr3+w1woai on its secondary coil. If 120 V at 2.0 A is applied t3ne 17+9qaioio/opl/ w) wq*;stqcc ro 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 h)z59ruph-t05obgq*b q rn:q has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in th0 b9ho t:* gqqr-un5p b)zhq5re secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20yp v5u 5pxa;)soep+ 1u0 turns. If the inpo5+s5p) xa1up vp;ue yut current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns 3cwd9k7jvub3 and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to 9buv7 wck 3d3jbe

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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 h bwtgmqz/6mp3tzg:f:2k e 31ias 100 turns and its secondary has 200 turns. If tg6e kpqmtbit/w :zz 1323mg:fhe power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V h-ne8qj)kf x5mr(l6f . 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 number of turns in the secondary if thn lqkrfhm 8)-5fj xe(6e 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 i-r q +pc9vo9gb7j i/t60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a prq 9+ ijbt7-vgp/c9oiower 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 V. The voltafj z fu2sso*+ )ohf2x.ge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. o+s.fxs 2ouj z hf2)f* 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 total resistair+v/ rft a4zg(we37j nce of 0.60 W. A generator produces 100 j+3/ igfzav (w7trre4 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would 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 529ok. y1*ln6z ty4m jlfg cmtn(d7s (q0 km long 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 transformer with a turns ratio of 100:1. What percm 9tfs.gjqd(* nlyzt16(2 on y4mlck 7entage 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. tw0m//7 psuo8g:xp hyHow much less power would be lost if the power were transmitted at 7wgm80yuhsto/ p x/:p3000 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 v q480.ooek9l uj/3xtcn 1ju3jjxsy:e v1 ;vn 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 ixq v3vu9u1.o018njk3n4 y xc /t ejej:vl os;js 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 adb8t5hu)ap2rf10us b current of 5.0 A. How much energy is stored in the coil's magnethfbap2b0 )8sut5d1 ruic 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 inzz2h k.uhnyu c c7-:8gductor. What is thisc-.k2: uyz7unzhghc8 circuit'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 ynyj7z- xh0glj om t)* ov09w2where 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. zd4,fu)e7 jz4q9m iv0u ir3*i evzt;u 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 120-V AC outlet. What is the resistance of the l1e a3s7 98g;/ziuqqx lo a;frpamp r ql7p8i g;/u9a1ofsqa;z3xe?

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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 supmwzr5,3ge*vqp s;ho 1 rb/ wcjroz;7,ply. What is the peak current through the reshgwm3;v zr,p o 7s5q1r/*oz bjw;e,c ristor?

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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 supply. Wha9j q s18e bjjbmg0w2y()rqtw-t is the power dissipa2yr 0s1(wwjegb 9j-qbjq 8tm )ted 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-Wmac3- gpb)ab2/vv *ka 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 resistor idmstb+uec *6fvi1 55 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 resip0p /s4z2 evwastor 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 11 s+ ;-6mgk8fl 1 wmpkmi/vpaa.0-mH 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 reactai 5eyhm6y;3 afnce 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 14.02b3o 3j0dox in-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary form+s lvy m-1y6p 157 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 indua 4/m 9q .jqggdqw3rn.ctor when 120 V AC at a frequency of 20 kHz is applied to it/g dja.r qg93q. q4mnw?

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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 thro ; 6 tzrcyyf*jvt nx6d53fbr7ne*+ rw6ugh 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.uib1 3j .yqob 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 ofg c 0dr5at/dv/ 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-mFm/d zty5n,uzcw 8stml( ..y d. 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 ca76z:f h kd7ppjpacitor be 100 W fpdpz67k :h7j?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5o0 tmdl(ht-i f:6,nty r e:ew4.0 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 impedancep:r*dxmk+vr- :ok.:/g zl*r x x:ywd (ok,yg c of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cadx:g krm:c:*roorxy+- l. k:dpg/xk( , wv z*ypacitive 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 coil, ane,wv lqds( 0z03 huda6d 1.0-mF capah a ,dd0qs6(0z3vlwe ucitor 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 ifab503ok8q -bkder a+p) pfj: e a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co ed eo5+ b:arp3bq8k- )pfka0jnnected 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 with a 20-mH inductor, what i i.1vo /s;id djza0x;es the impedance at 1000 He / izdois .x;j;vd1a0z?

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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 cwwvt8hxt 5h 3+:kge ebf4 (pcee)ko4 7onnected in series with a 20-mH inductor, what is the phase an:+heok4 ef4hv t8wx5t )e7g3p(cbw ke gle 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 1lu ):mb+ othkcircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz?1)l tuh+ :mkbo

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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 1uf01jl eh4.lhm gdwpa/1 y2oin series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 flhw1y / mugo.ap01edl j21h4Hz?

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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 (q1ng8dmy d ap6n) p6:vtrc4oseries with a 450-mH inductor at 5000 Hz for a total imped8p 1 a: yddnrvt4o6)(gc mqp6nance 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 znrq9mned p4h-68 u7n,t unrtyll*);in series with a 100-kW resistor at 1.0-MHz for a tota8l)pn lq *r 4tt-y7,he n znd;mnruu69l impedance 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 conne.y ot8a usg7b2cted in series with a 20-mF capacitor. What is the impedance at 1000 Hs2abo8uy. tg7 z?

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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 cap3,bjd w/(u4z* z(oqwe +ilfmracitor at 1.0 kHz for a total impe eqjzwid4+/3 zwr (f(*, blomudance 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, r 85jcljzwsa g;z/ 1+fnqox( a 10-mF capacitor at 1.0 kHz for a phase afqs g5; ,j a rl/w(c8nz1j+oxzngle 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 for a g1uqry ey:8g13xw y;atotal wyqy x1 ygarg;u38e:1 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 ilj7.ss. c/ea am,puo6 6kvm 6at 120 Hz. What is the phase ae ,./v66jm coaiulka6s .p7msngle?

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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 re4 ri ;9vdg2xnrnis+*4 7mjdxqsistor, 20-mH coil, and 1.0-mF capacitx 2qxmvd ir;i94sn74d nj*g+r or 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 capacitor, a0y 0q lmcba..0 lp)kycnd a 0.350-H inductor. The circuit is connected to a0kpyb0 lcc.a.lyq) m0 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, adv5qay my 7y. (exp17nhr;cf, capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What currentymcey 1dp,h(a7xr7nf.q ; y5v 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 con.jg02x mcgs:*h1xvkvtaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, 0x.vgv2x 1 hs :g*jkcmwhen 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 s/x*g 6ahdfawlvk2j* z-v)a/weries with a 500-W resistor for a phase angle o* ahwl*d2x)z -fkva6a/w /gvj f $40^{\circ}$ 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 bq tz02 nanbs 2j7 0ea;p.mf,uhas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driam7.ue t0 q22jas; p0 n,zbbfnving 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 an4b g( *g9,hvekcmcej5 ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive94 gekm 5v*e j(hg,bcc 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 circuit b 9k7.aqwdzr ;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+o*n( 1fl8k+cavypjq7vck/ is is.: q an impedance of 60 W and a resistance of 30 W. What is thef1 yqlia+(qc7skov cp:k8 +n ijv*s /. 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 a series RLCi6h 1uyn,oen a.gm jz y721cx8 circuit containing a 50-W resistor, a 10-mF caa6ye m,ix7h1uz1 g.n nj8o 2ycpacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor aiqwn; 3m *kbf5iv 6,voe x:io;nd a 15-mH coil in series?6io,5;inw;x omi3 evbvfq :* k

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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 resonn btt/jxg/h d-k*7f7a;50 fjaadp e z9ant frequency ofa-79*g/f txp e/ajd5ba7nj ; fzht0kd 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 inductor for a re(s.*zirwnx, z sonant frequency onw (. zxr*iz,sf 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 cgzy q u,fg y/a+mym;e2 +q7n8be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 10g/z ey2q+m 8c,qyu yg+;7af mn00 Hz?

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