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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://autodiscover.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://autodiscover.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of *4v.wed 8 n nm50s k3,ifijgklru.rl7 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 tgsm0h+c)*8oy(lnyau 9d**2 p i 1upm5r iscskhat 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 ini *1a*t,9r(sjz qd jy os ca/8y0-dgci a coil produces what kind of change on the indu0gs/9c oj1asi* y rda,q *cit-j(dz8yced $emf$, 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 magne7 h0e(+9l /jv jzyikxutic field through a loop of wire produces what kind of change on (7 0kez/uxi+jj 9yh lvthe 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 kin-pwl1 8jrg**+zrw xn wd of change on the induc +wx 8 rznjl-**pw1rgwed $emf$, 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 d d( 6wm,qcw2ej 5zjk(field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced currenn;z;9ego:bcx xn9,52i jpv8d4htq i ot in a conductor will be that which t :ejhqi;8nicx pb 5,zo2n;4vd99g xt oends 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 bar magnet is 4t0t*y. mh3ze necb2s held above its center with its north pole pointing down. The stationary magnet indum 4 2et*hz0.cyteb3 nsces (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 5 qxwc2z.jj +omagnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnetjxwqjo+2 5c.z 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 regionr+wo9+ua3)fw wn qm5z where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is th5z) mf wuo+aq93+nwwr e 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 ck-6++r3bljidm-ozn +lh oz2 field vectoo 3dmo2l h+-znki+lbjc-z+6 rr points 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 gqdw 08zsg4bzka (3ro2*fw 4ctop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direct ks0a2* zw cfr4zwo3(bqdg4g8ion 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 horizov/y7ox m+ e1(sdyw5im ntal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eithewyv5m/i1 7ox+md ye(sr side of the wire. When 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 gd4 4(cl-ap*ff pz4px 7a;ipqpole entering first. As the north pole enters the wire, the pl4-;*(pfz fq7ap ci x44apdginduced 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 eoh-(v7+ 5 msvy6nin:parf. pjm df/ (constant angular speed about an axis whose direction can be varied. In a region where a uniform .+5an/(nfohrp6fp ( -s evi7mjmdv:ymagnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spd4kixk84dl 4feed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien4d8 l4kdi4k xftation 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.;f 4 5l/qw9nbteys72e7p x eur
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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 anj8 w kl4hm;:ykhj9v8a $emf$ 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 magne2ksf rl,xau me /l3o 8k rix0:d4m34r/w)rcuftic 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 direction) isj z(lrd) t)b/otdz5 z. moved northward at constant velocity through a magnetit/)d zt)j.z lr dz(ob5c 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 rotates at n 7t gt /h).d3jrw7)khbqn p6na 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 transfo6cql5ny)v( e lew05 ws*cn ypa+2ptt,rms

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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 each second. The frequency z3 s ,nobfel;h09vj4 q3v ny*eof thl9 ve;qbz0y f voj,n4*ne h3s3e $emf$ 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 usw 6w.u h,rqqd/ed 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 d;7nm9rq zn. lgevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the se. d bjb;q/lh.d 7z+ort,, tgxecondary coil contains more loops than the primary coil then it itlr,tg db.e; h q./zbj7d,+o xs 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 (a.l4zt )sg, qnnnt9 uprimary coil contains more loops than the secondary coil then it is at)aqgzls(4 u t9n.,nn

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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 inputnt7ljg d t k,k;f.vydp 9zx; ;.i:,cir

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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 resonajkm u40zr ph;*nt 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 ideal 6tv+r )ynrs v4miz:n5 7bx vp.battery of constant+ pb:)innr7 rvsmv45. zvt x6y terminal voltage. 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 induczv)b hxixq 3 t,p, -men-duz+j*9n0altor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batterynn3ux )j -xtl im*qz-bzhap,ev0+ 9d,, 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 i/)*sgx-(nwpo-np rt inductance 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 resistan vz6up. e8np43ca dl)yce 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 seritqxs6 zy,.mdnzi++mk k; z2d0) xk8lo es to a battery. The time constant for the circuit represents the time required for th20.lz)xzx omd+di+mznq k; t,k8 6s yke 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. Tn()+ inj2.hgd oim4rafs+m 7fhe battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to j gnf72im++ h(a.f s4od mn)irdecrease 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 suns 1y g 7ird*c)0:edhave 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 this circuit, the curreqy rv9gjv p,cxbwux/1 x;f4zk)r;+e)nt

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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 circuit,gg*a5arrr4 tw/ya3f6 lam*8a the currenw 6fag/y 4rlat g8*5a3rram *at

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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 ci )ksm:9mo3nzo17fmz ydp( :lircuit changes by what factor when the frequency is trip(3 )1fi :z pdmozloykm 7:mn9sled?

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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 l*o+i1h rsc:d q)c3amis doubled, the inductive reactance ofadlsr*o:i)c 13+q cm h 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 inducic 71a : q xfrhigg3kf8n69y,btor approaches zero, the inductive reactance ofnih89 x, r1q3gff :ik gay7cb6 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 45l-re g bzjehzk-n9 pf7j,n4 to an AC power supply. In this circuit, the currej9 ,4jzfe n4pkrnz e5- l-bhg7nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by whnpa 8t9radnkg l8(o 19at factor when the frequency is tri8a8rd9 tnoa g9 l1nkp(pled?

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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 +zy vkmdc y5(5zero, the capacitive reactance of that capa5m(k5c+vyd z ycitor

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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 volta2w* fqc)uinn4xl51xq ges of the inductor and capacitor in a RLC series14c*xfnun5wxlq 2) qi 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 c+z)su r(sqd;6jnx e u;ircuit 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 increases if R ix ukx 7fm),8bhr4:hjbncreases. When is x , r)kxbmh7h4f u:jb8this 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 cirlqup96z (;whq) ezfp;cuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit inc3 ru6q3h:nm0/w,cf+dhj ct jqreases 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 iv- e9qi1r)w)kte pu8xt 8/ 0hm5mk osen an LRC series circuit, the resonant frequency of that cirt uw8op8 1vekr9e5xetsqh))m -m k0/ icuit 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 4jdht yg8n6v:wc2w4c applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wu fpdu)0op y6yg-+p*shen

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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 magnea*xf8 vf x0rc 8py4l.btic field of 0.20 T. Find the magnetic flux through the loop when the plane of tbf f8v x0cypra4.*xl8he 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 d3eii6 3rakc ,of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpen,de ii k63ar3cdicular.

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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 )q v zkd,3,plabr66n;oy c ei8field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anglelc n6 ,k8 a ,)pidbqr36zo;evy 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 lw/w 5,o h;,yswwf k:e:byik.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 cha , r4fh34 coj/h3xmsi tzy6lce-ir,v,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 gg qy8o o+9 nk0x2+ l+ozb/ q;/l7afwxd qln:fwith sides 18 cm. A uniform magnetic field is applied perpendiculyagok++zd+n 0ql7ow;f lqgx9qx :f2/8bol / nar 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 with 15 tur(i y;1l.jh0oex d;z+cdj 1pcdns 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 yp(rn d1 4e d-m*qmkt4area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where the ,dirkai 7 i(nvh,q -v*downward comp- iaidhrvk7,(n, viq *onent 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 +xp,mi1 a) enw gos)/ris 2.0 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 constant magnetmg)po ix)+r1n,aw/se ic 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(6ah d k xk-w6zup.hp+ 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns-uq:xqao l0 f585b9;pzzjck;t usv.v 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. Easu73e. v 5y(7khfm afwch 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 magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will beh5yamev 7. ku fw3fs7( 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 of uj/ cj/2xg 1tu,f2jzx 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 8z24flg rkl f5construct a simple AC generator with an output of 12 V maximum when rotar482fl 5glz kfted 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 gehkf+3n wzpbc7 k*kr; g*5y)ln f-/moknerator 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 resistanceiaz9a br79kb 3vluc ,5 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 ref:jcy:o n ho./sistance of 6.00 W. The motor operates on 120 V AC, and when running at fj::oyc h.fo/n ull 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 resistan6 vi1-8m 6znb eslzvtu 6y+p7bce 6.0 W is connected to a 24-V power supply. The operating current is 6tbv 6u 8eb+zyl6m nv-zs1pi7 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 sup+ k gkxtvu-7j0ply. The operating current is 1.0 A at full sp7jkv0 +g-t kuxeed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply5yi0qo)v s1:ipiu - tb. The operating current is 1.0 A at5)qp1ysi o: -0 iuvtib 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 neavz ) 58xoifw/eded 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.nzx2wi n9 c8ylgeo, ,. ac8 xe)9ip.0rfbuvA to flow in the secondary. How many ti. y 2ei 9zrpnoxl) 0bv.c.8x9a ,f8ec nauw,gurns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a xo o e77a3z7a y1hvuc,110-V primary if the 24-V secondary hyo oe7a7x3 7uhcv1z ,aas 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 secondarlxunim 6 z4ntjkx 4z, ykv 0*d44)4atpy coil. If the current in the seconi4n *u)6xptdzvl40njy4tm4z kx4ka ,dary 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 aumt kdl d/mr1e;zy-69 transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seconda;9-uzkd6d1y tm/emlrry?

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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 p:ihnvjutv vk2iy./;w2l58 g trovides 7500 V at 10.0 mA. The primi/vtu5ng ;:8v2.lyvwh i k2jtary 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 turns on d*bof-kg x*i: its secondar * -d*fkgboix:y coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seconh stf6dq6n6k8dary coil. If 120 V at 2.0 A is applied to the primary, what current is pr8k6nhqdtf6 s6esent 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 hasgg75sw vpsaeu a *n/z0tg g4/2 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, 27s g5eaptavw4 0s/gg *zu/ngwe 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 and its secondary has +8mtb;mms 7dx200 turns. If the input voltage to the primary is 100bm;8 ms7xt+dm V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has b0 m2gpm::njc 200 turns. If the power input to the primary is 100 W, we can expect the powe mbcg:jm2:0pnr 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 usua hcaw9 ;9bejj5lbo *f1lly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tuo5b*1b;e a fwljc99hjrns 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 1 55obwe o5/fyys1a* ts20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pow b55se1*s 5/aytyf wooer 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 voltage is us 3lrzkyys:h,pw7/ 5i2fqtd/n ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the vo//3ykh2 :pd,z l7tswy nqrf5 iltage 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 resistance cxl ;m /lyi y.*2yfhc/of 0.60 W. A generator produces 100 V at 70 A. In ord*hx;y.2 lcfc /mi/lyyer 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/ vv: sqzq*t+s 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 percentage of the original energy is lost when the transformer is usevs qz:s qtv*/+d?

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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. Hbd( p99u pimpjdx2)/jow much less power would be lost if)x( jim92bpj9udppd/ the power were 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 s w- //ptghtxa )x79j.dmqd/gat 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%tdm dh79axx t -gw)g.qj//ps/ 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 current of 5.0 A.yw(rpwa+) t mxy,wa09 How much energy is stored in the coil's mag+rw (9p0w,yy awamt) xnetic 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-Hi)3f4 ec z)lzggkff9+ inductor. What is this circuit's time const )zf fig49ke cz3+lfg)ant?

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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 1ahzi:2m*x:(v3p r jtsvp*s7r20 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curr2s-jh3wb-u(49rl emom a. a ldent?

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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 l cwse2 g9;j5ulampl;2ju c5w sg9e?

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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-d mza g)+nhe1av68bm d 6v)yc ac power supply. What is the peak current through the resistorvmhm 1n )a)d+6evyc- gba z68d?

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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. Whaz)on -qqeuiw(p3m*3k t is the power dissipated in qo-)iuk *nze q (w3m3pthe 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 50ha kvbn93s+rja;; . gc-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 resist/d :hzcr4bb/y or 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 50-60)znlr x )xwdv9xp0kl9cd ;i g9 m)qt/n apj: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 f ;-vkhj-smnz qujz )q8+7f5i at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 H0i2rk1nj gdiv99 ,g3z t t/lgxz?

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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 crcib( )i;a z4sh jr,el,t i-u1oil 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 necesseqh0 xv(dha 97hix2- mary for 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 inductor when 120 V AC at a frequency of 20 kHz isxswdz/sj7 oaio36u; 7 applied to iwz/sujdx7so76a o3; 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 mmfm(4i .i kw aubmw09s/cc,6 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 re lh+:4w+o c(wi e.eskhactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of ,; 1k:wua yqlicapacitive 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 capacitor have a reactance of 1200 Wm *sg dfj8*knde q0*m8?

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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 reau o-g,k sdci,3ctance of a 0.010-mF capacitor be 100 W?o3,s udg-,i ck

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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 c100 p xh:vo efu;xbd+m c)z2lfapacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with g 5f7z dlvpeysc*6 )0t12.0 W resistance, 15.0 W inductive reactance, and 10.0 pv*dt)0e6 yl gzcfs75W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 15hdakru4u oe2 4+7dh. b00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected.udkba + 42u7ero d4hh 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 4 ,3+zhorf acc3/spgx1.0-mF capacitor are connected in xc pr34a c3,fo zhs/g+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 isdo+(e.,6xd 5 kye3;s;r.m abkbdq uka connected in series with a 20-mH inductor, what is the impedance at 1000 e ao da;rkmud6;d(se k5q.. xk,+bby3Hz?

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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 inductor, what is the pe 82mul0cxvt+ez:oo1 hase angle at:c0 vol+ux e1 2ozem8t 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 seriesu4gobrhk (7 (t circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W u4g7 kohtr((b 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 with a qll(19bni l6 ge*mqt+100-W resistor and 15-mH coil to get a total impedance of*l 9n tlq mlg+be(6iq1 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 ama3v6dw3i .qb4 dn5b be put in series with a 450-mH inductor at 5000 Hz for a total impewdadibv34qa5.nmb 63 dance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resiq 8do-jekwo0y62n8h5xxe4 qzstor at 1.0-MHz for a total impedance of 150 kW?w42y8q xxdj6e-qh z0 ek5n8 oo

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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 sejwhcyzcb ,y d t*v6-6+ries with a 20-mF capacitor. What is the impedanc6vzh,by ctc-yjd6+w * e 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 x06nuo k:pon, a 10-mF capacitor at 1.0 kHz for a total impedan:6,poxo0 nkunce 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-m*io9tmu2+d tez (v 6dfF capacitor at 1.0 kHz for a phas+ *ddi t tv(9oe62mfuze angle 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 bgf.,a+eu ikpzzt;w;6zm2*va total impedance ozg;f ivmkpe6,bw.a*;2 u+tz zf 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 phac 6g+/e(mh,k poy1mihf9e o.j se an.k fm /+gioce (mh,yho 16e9jpgle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 194gm mjsm:7kicybx;pf hj0, y l.,nl1.0-mF capac flkcm1, b,.9ymgjils; 4xpm: ynh7 0jitor 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 resistoqpmq70 +q;m o+9 .da/anumsm lwv*vw: r, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60+v u dq m mw7;wnqlo*:m09.p amsv+aq/-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductoq).i,tux8l ys9 idcq/r of inductive reactance 30 W are connected in se 8 i,q qyt.cl9)u/xidsries to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, a 9gccvki n*,;v jq zv;d fgm8/610-mF capacitor, and a 0.45-H inductor, whe/gk d gj,v6vmz;v*ic8c fn9 ;qn 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 zc. dt/bpk-p,phase angle oftk,cz/pd.b -p $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 13oab *x; tpqdft1 jx5)0.0 mF. At what frequency should the circuit be driven in order to have maximu atq)*p jo xd53b1x;tfm 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 y ixo)73zv- 1+uygjd1,sspp ss g,fc :resistance, 15.0 W inductive reactance, and 10.0 W capacitive p7oy uxsd 3:vgpsizycf)g , s1- +js,1reactance, 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 circuiai.fv zute9o*95w b o*w+owc 6t 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 ym4z mo izvi;3mrn51*rh,g 8hand a resistance of 30 W. What is the power factory4zm r irmn h*h1m;ozvi8 ,53g?

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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 5: fxs6l4lx3 cbngu-0xpw(kq a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wh6xxfkn4:pqcu0w sll (5gb 3- xen 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-mFdv*s9xdr -ls 1 capacitor and a 15-mH coil in series?vd *s-rs9 1xdl

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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 c7y; +btn- 5 klajrs.abapacitor for a resonant frequency of5 ra at.b+7 nk-blyj;s 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 inke9qi* i; dnkr+93 ophductor for a resonant frequency of 1000 Hz oi;kp9nr9*hid +e 3kq?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 7 gk7brmi+oxba9-+fhc:4s qs40-mH coil if the resfrms++ o 7:ahbg- kx9q 47csibonant frequency of the circuit is to be 1000 Hz?

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