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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 are units of li:up6r1jt y zd)2u s)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 t v5644 lpn-a) jr p,a+rge lreyf(wz,rhat 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 m f7l+; )ahhs dnxiu3t9r7r 4eof wire in a coil produces what kind of change on thel9hr mnh+ds te3 7fui7 ;)ax4r 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 thzy.mqv*. 0zj rez:ol: *ntr8t;0dq7;dshq m ge magnetic field through a loop of wire produces what kind of chm red;;q *m.gzlt: *or7n0q th8ds:zz.q0v jyange 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 pru( -wh.fha 9 kc(1x9kb1mc0thgke4nij /q. buoduces what kind of change on the induce -..wu(q/ehkni1j940c tmf 9hhucbxkk 1 g(ba d $emf$, 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 magnetd/x spe9 .bfd-ic 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 ind. 9fri0w0 1ag5gjlp7rcsde b3 s8kr2f uced current in a conductor will be that 8 9r.jlgkp bfirsa0053 cwe1gr27dfs 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 j)stz )ibgp (5m70*vk)dl yef. A bar magnet is held above its center e v)7)*j )y0bl5ti gmkpdzs(fwith 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 horizonrfdb8y b**.d5w/zla df:iuz, tal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet i,:bd5 fb * zrwafu d8.yzdl/*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 w:4- jwkt;yth pnmm5* in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in * mhpk:tmwwjy4t;5n- 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 levet- qzn*5hhb2 cl table top in a region where the magnetic field vector points straight upb2 *5q- ctznhh. 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 tab+:wlr 6mxylajw8k5t . le top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fryk jw6l:m85xrwtl a.+om 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 tab+ocfubp.tw0 6d w**xsle and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the if * o 06wp.udcbsw+xt*nduced 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 eioizy: l en)p y+p424hntering first. As the north pole enters the wire, the :zl24y4+he inppo i)yinduced 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 cozw :c,qqd+4s3 r5ro dunstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field por+qwqsu d:rz5c,do43 ints 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 i ,mko b0cro re( ku6t3;xsl/(cs rotated at constant angular speed about an axis 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 the induc tc 0e6k( (m 3uxrlobor;s/,kced $emf$ 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.ij3du l(xl60d
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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 an 1mygq)/ns7ba $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fi)*wf/g0q * ejpm1pg yveld. 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 eas:*1ky;jj lzivt-west direction) is moved northward at constant velocity throuk *ji;y :zvl1jgh a magnetic 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 a conmv9:em8b/h z3:bbjm7 mdkzse7 nsx+:stant 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 transfrp-w1yd29oyf; m/hdjc6yjamk 4ej/ +orms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequeni+fwdc96xt ivn)d ;5d)oo4 sycy of t9f;) swc4i+t odx56 dn oyi)vdhe $emf$ 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 usegct dy7wkx tl*-0 1kujx y5b6,d to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devcu2 h /*tjkow)ice 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 secondary coil contains more loops than d1fh+;/lzddj wx.dc2gz +82oor sej 8.v e c:mthe primary coil then + hdrgwzm xv../d8 2od+ 8fjc:2jzc;1eosdl eit 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 lcbe6vett r fbm:, f7qroe09.; oops than the secondary coil tftt0eb m7fv b,orqe;c6 r:9 .ehen it is 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 in:r0isifoz a6 j9e+2tbput

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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 circuit, a 1aen(o9,+no0zjry j

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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 connec 0o/* )kbtlcsbted in series to an ideal battery of constant terminal voltage. At the moment contact isk*stb oc0 /bl) made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in se8cb, ncf93eg y87jxvk2mz s .mries to an ideal battery of constant terminal voltage. Abczve8 8.gxm, 2ykcmf7 sj93nt the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L anfe;7 v8 x3qkgw mplji5v b3ik07+q; hud 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 wi.-+wog. bd*spj7u- bj b mqfa/th 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 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 conkrio*9;n qqz- nected in series to a battery. The time constant for the circuit represents the tizr-k*i9q q no;me required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are(n1). + 4x smniylz;h8og mmdf,lkn9e 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 decei xnnnd (84+9 fg.m)omszkhll;m, 1y rease 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 unitsu.y 2( -v .xaaf4nw-tc*hjwwu 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, t3bzm:/ut5o6 so hri2ghe 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. 4nqo,l6 qc0rsIn this circuit, the currentl,s6 q0 roq4cn

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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 the frequl str:kexd56aga/0 t9 enck aae/695lxtg :0t drsy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an indg 5-fp 0.b.5cugfqd4b p lagk6uctor is doubled, the inductive reactanc p45bb. ku0g6q-5d ap glfcfg.e 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 approachesg;h 4gpxde-lt3sdp;u 1a .x j8 zero, the inductive reactance ofe. aplx -gsgp3u;dht 4;xjd81 that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuix,n4 f8 -qjy/vta;h-ad xg8 cgt, the currentqf; x nagyagv 8/ thd-c8,4xj-

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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 cir.uw w*e5eax5huj-x z6cuit changes by what factor when the frequen.exuja5x w hz*-w5e u6cy is 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 voltqlu. .,q cvtor*3asf+age across a capacitor approaches zero, the capaci3qc rlo.su *+vfqta,. tive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the indi5g;m8z 3e,i zn+zrduuctor and capacitor in a RLCid3r z g;zen,+m8iz5u series 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 circu*y )5le-x myrhfgd)8l it 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 ; sw1g+-nvl7 3/jrrbm;iffc uof the circuit increases if R increases. When is this statement true?;1; s3v-f/b u fc7 i+rjwlgmnr

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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 impqvn /6j1 am,1ii uvt+ 8aksg7vedance of the circuit 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 ij.ip7/ k.g +uhil0x dz j wwrsa):t1l9ncreases 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 splb+t; l tx59neries circuit, the resonant frequency of tx b+l;5t t9plnhat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonas( wsbp7:c k*dnce,

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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 wh gv; fusl,67xnf zx1-ven

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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 m3a h3gnjh0 (ydyd z54 uz-mrc1 is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh1rgj0hm4-d y3nz3( dz 5c uahyen 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 fin26 kfn(n ysy9eld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vect y6sknny2f(9nor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.thx;i3-: rtgw10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux th3t- i:hx;twgr rough 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 adjustabis lk05hy80p-xb rl (ur51kf09e k qumle 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+ i-0g lp34k5burf p:vf31lrx p-;ern( jcgqi changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18* ux1p )+7iqiho iyp9gir5vp) cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the ind95 xhp qryp17i*)ipugvio) i+ uced $emf$.

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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 w ihas0-kbp*c ,ith 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 areaq;ho0feq+t k1d 5 ihv6 $0.20 \; m^{2}$ 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 wher *87 r 9ywkkkceo.3hqke the downward component of the Ehc k*w8qe9r kkkyo .73arth'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 constantm . 1xxyfl;a cva(4+ec angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fixc +41. aaecf(;y mlvxeld 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 loe;f2p;vxjpk v;;.o ak ops 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 cons1 72f(bcjiktsists 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 rectangularnxd, f e.xk oqyb x-n/11v+dg- loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum outputegfd qx,1.-o dk+xn/yxv1bn - 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 wir6f, yrli9ry,4 i9jk.b ;yzk6oj5ikw he 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 construc yzls7fd2hz6z;n088dp j ;nl at a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A mf6s;0z8ha2yd nz lp8 dj; zln7agnetic 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 generh96x au/rt -6fly+ pzlator 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 mok zw dzj2*. b8 ;7g;ooa*r1dsqb ua.eotor have a resistance 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 resistan nnd;jxdf))c9 ce of 6.00 W. The motor operates on 120 V AC, and w9)nd xd;njc)f hen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is con xbmydc 4s4:6 50:prf;fiptg-vk+1 jm7 e tarwnected to a 24-V power supply. They- sftkp41gja6p5:r;fe47rt bxvm d+ ic0 m:w operating current is 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 supply. m+;xo t6m am:cb7f 4yqThe operating current is 1.0 A at full speed. Whtf m:467+ bqmaym;xcoat 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 supply. Th(g8,s( , +oyzwvudfppe operating current is 1.0 +dzg8((wousy,pvp,f 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 redgp(a/q-5a1+p9n*ay s b7yyz ,qjkphouce 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 tre)xfzd4 ;fe; tv8 d,kransformer causes 14 A to flow in the secondary. How many turns are re; kt4f,f);vz8dexd 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 1zw0x )9qq vuj:10-V primary if the 24-V seu9wj x)v q:qz0condary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn6(av n)yiauxl gz(/ )u secondary coil. If the curren(z()g)ay/ 6naxuv lu it 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. Assum2o) * wy qbxbh2dygow)64b-h3p c sp)ging 100% efficiency, how ph3)y4hsb -*w bco q2 xyg6)b2ogwpd)many amps at 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 transformer+) 2i1z xpgjaio:( itm provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What:i p+gj1)2xztm aii o( 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 8ye rtnx6u rho:.z.6;mw, psu300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present ioyrszu. .n 866 rx,w u:mp;hetn 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 cot kqz. g7xr;:ail and 300 turns on its secondary coil. If 120 V at 2.0 Ak7xzt ;ra.g:q is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seco5vs.wq 6f aun5e9gp9t ndary has 200 turns. If the input current5fwu65.qta9sv p g 9ne 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 and its secondary has 200 turns. If 4z*sm*;xogbzqc8u4vq8 z nh 1the input volxmv 4;*qn4hg*qo 8sc1zzz 8butage to the primary is 100 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 seco*q* .5kvzq ytmndary has 200 turns. If the power input to the tk.mq 5v*q*zyprimary 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 ofmfqa.su,v , tevx28a8 current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondarv,fvsx,82at.uq em8 a y 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. Thfe+fs fsv(rsww) 3v95 e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancefvv (r3+swefswsf9)5 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 usuallyjk0czu7s7gvq )hvwso) 8urf js4m+(4 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 grsf4jqvs)v8sw7uho(7cu + )0 4 jkmz 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 resistance of 0.60 W. :r0h1us,msqd7coku q g(9ys1 A generator produces 100 V at 70 A. In order to reduce energy loss dueyu h,gs1c 19u: 0kqoq 7d(ssrm to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generj8j btnq*)sb dl7(hoibi(ro -qm dz16y(,7i lator produces 100 V at 70 idzrdm- (inyoj( qsj l67* bbb8 o)1t,(iqhl7A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line ; rd *tqlxg::.ehk1z5p tmx e5at 1000 V. How much less power would be lost if the power were transmitted at 3000 V 1pxl e xm.h5; tetzd*qr:5:kginstead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tr-cgbv)hfw7a 6q p3wk6ovq4 -xansmitted on a line with resistance of 0.60 W. To what voltage must the -6v4-x3qqok )gfh6pvba w7 cwgenerator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 2y3.ikjfb 6o lvw-u. iA. How much energy is stored in the coil'3koblv uwjy2-6 .i. ifs magnetic 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-s*vh(:xmj*ki H inductor. What is this circuit's tii k vj*(s:h*xmme 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 voltqvl6f 2jdoce itw; 0l7wp,kn5+-* mthage 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-V AC outlet. What is the peak bm,zshe0 c h- 7ecx,i*52) kte zxzks2current?

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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. Wi3th m y1cel0+hat is the resistance of the lampt30ycim+1e h l?

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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 powe0w :) bx kjsx+k,p2a76qaw bxur supply. What is the peak current through ta k+6p,)bxx kab:juw7sw0q 2xhe 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 supply. What is the powern2*f h+tqeq f/ dissipated in the rfh/ t2 efnq*+qesistor?

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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 efcop*oza*u ,*2sayy5.orp wrn.5l5resistor 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 resijoy l,4 + m,xwdc jva9 +od;gd.,mz)usstor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isj0 6udavc2 )r7jz :zok $I = 0.80 \sin (240 t)$. 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 6oh16e:,rxlzhrcaz fc24cn0,(k qp . b0 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 zhj+*o y8te)k 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-mi2b pw3y, a)ccp3e tv.H 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 fr)5cochoevp xd0 /v61or 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 inductk4dw vrd(z( z*dese 1.or when 120 V AC at a frequency of 20 kHz is applied tdw.eed vz*1( drs(z k4o 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 u4zd:h k ,3ytw3ak(am 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 q3kqg8f5ql h1reactance 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 cape2okq(uf;t eo6b5eln3 u c bx112syd1acitive 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 tvl/mokr90h:2 mbtoxf6tr0io.fy 0 )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 capacitokm pa+,gd .a;xr be 100 W?kpx.aa,;+ mdg

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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 0.00k s qf+f 6fyd8a4vaq;.10-mF capacitor 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 seri41ddsu7.oz0ie bvv1;k se rm 3es circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cau1 4zv1r0bv;idse3 .7okmsde pacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, qof*q .q:hi7p and 1.0-mF capacitor are conq:*ih.qoq7p f nected 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 resisti v:fu7*fhfmj vriovr 1ec50;5is f(5or, 20-mH coil, and 1.0-mF capac7vc*5i0f 5sr vf ;(urfv5 m1ijhfo ie:itor 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 ser: ,2k.yar7vrbhl c. -tua smc8ies with a 20-mH inductor, what is the impedrat2:s7cuchb k ay.l vm-,8. rance 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 inductor,iof5 evsg*+7oz a4 -oyt 5,oir what is the p*5ozgo+-,ar is f47teov5 yiohase angle 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 cirp ;*1*u.4ovij bxrhfbcuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hv* b frouh.p1bj;i*x4 z?

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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 wiw:t4bkz 87 c;xr)tz jfth a 100-W resistor and 15-mH coil to8kjb ):cwt;7rxz4fzt get a total 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 with a 450-mH in 0n,80ondbwxpq c 6 5lmkwx(3hductor at 5000 Hz for a total impedance of 40n h (c 0kmowx6,qp 35b8x0wlnd000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must3zl0 kw )vj;tf be put in series with a 100-kW resistor at 1.0-MHz for a total implf kjzt0v 3);wedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the im6nfvp np(vk2y z 8;/zq)5tjeopeda(5/ ye8t6 ponvj;kpvzzn 2q )fnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 2s4zayk-uq - 3gmb m-modh:ftur,91 j1.0 kHz for a total impedance of 45 W?:,btjo-uq- h kr39m1 dmyfm-2g z4aus

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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 witk;k )c 2q7m :r(wm49kbarsf ou3 in(ygh a 10-mF capacitor at 1.0 kHz for a phase angleok:)3 nwrbu km 9s;274ka cyfgmqr( i( 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*qx(qk hs-ix .h6ts0k qxqpye(n+5u( resistor at 1.0 kHz for a total impedanc.hq+s( qxnxp5euk (( -ihkqqsy6xt*0e 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 phbt5m cju(o f a5 .+z9vu0xvw+yasefavv.0+ 9 bom+t ju5xy5wuz(c 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 100-W resistor, 20-mH coil,5y3wjo 7aadcgg:vd - ( and 1.0-mF capacitor d :a(-5 jod7ycv gaw3gare 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-Wn2jp* oa3uu nk4*s c2q resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-Vcsaj 43pou2kn*uq n*2 , 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductordvfyx ; .pv3: kcza x*e37w s:8+avztc of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What curxz. 3ev c:p+f w:a7av k83yz sv;xc*dtrent 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 ,oqhiciv/xg 3- :.nas circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H -qhin:.sov3gi xc,/a inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle /;r *hptysj be.+ :nnnonyt en/*.n;pj hb+rs :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 has R = 20.0 bzxv(vd n8t);vp(q: zW, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourcepz() dvz; tv:bvxnq( 8?

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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 invbrj82gcu+g,b,jvvp ;s- 2,ggmrl i ; an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sspr ,v2u;bv gjvmb -8i2c; gr+,gjl ,gupply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circu. +te8z6pii3i; htyea it is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resi1jk ghj60ztb1nn b* v5stance of 30 W. What is the powe j *b6n0bhnv j5gt1zk1r 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 contaw)nx *((fy flnining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supf*((l)xfw nnyply?

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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 an5vbi3v . era.id a 15-mH coil in series?rv.3bi 5iave .

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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 resona.g,2n kv2f: sk)cfse ge-e 3ylnt frequesfg, 23seyvf:c k lg2.-enke)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 seriei6y5 ;gjyap3cs with a 3.7-mH inductor for a resonant frequency of 1000 pi5g y3;6aj ycHz?

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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 83dlmn g3co1s with a 30-W resistor and a 40-mH coil if the resonmncg sd381 lo3ant frequency of the circuit is to be 1000 Hz?

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