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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://mail.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://mail.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 adnvh5oxohp(6 e3yj,0 re 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 statmvqdxr c 4z5,oj6w/0m es that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a bt: kq7j8 v/4(a-o kwcbwn;n zcoil produces what kind of change on thet;c(-aj: nn8 w 7wvz oqbb/4kk 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 field through a loop of wi+2 *dois*kb smre produces what kind of chan ods i+k2m*b*sge 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 change on the ins:bt: b86 dfdvsnz)2 fi6j0 onducedo6vni8: )ff2:0zddsjsn b6bt $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an 6sqh 47gfwpjj. p(wmk8yto:d8-c x / b$emf$ 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:o tx.ctp; t0(iwc1ht fxa s0: an induced current in a conductor will be that which tends to produce which of the follx0ti: s t.:0ac1o; ct(txpfwhowing 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 .u1 l bo:d4ixsis held above its cl x1ud:s.4io benter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a ho66w d sv(kr9,q5mee( qi6uhfirizontal 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 induces (wked(6,q5wsifv re6(h6qi m9 u hen 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 red9kuu icto6pzgn,;k;f.oby mwn,k-2( 36do n gion 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 this coil as the fieidzkp (wn3 muon ob,kgdk9un.ctf;y2 6,;o6- ld 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 magneti5 lo fn*,cmbf7 *tb0a4esce:lpu,m8 lc field vector points straight up. l7mm,*5oc 0*ff4sl,n:b8l bpauc te eThe 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 horizonta( x5ubn:hj4 .o0nl o6-pij0qv :pdcsal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what 6x: 0u. bvdo0-c5i4: jlop qpsna(jn his 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 taxfzcgaym:dtf ,y 43)6 ble 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 ftya4)fy6d 3: fgxzm ,crom above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole ente rse 8y5vqw/nen3i;7uwi37rx1d e.mcring first. As the north pole enters the7 cexwq; y1/uieien r5ds.r n83wv37m 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 axis whos e;wa:8x6, jwu e*qtxse direction can be varied. In a region where a uniform magnetic field points straight down,*ea6sxj t 8;:uw eq,wx 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 cons 6-y h.yc*eqk2acopf i9nkyi 32c3v9ftant 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 axif3nc. 2pcq-v 9i9 kyfi*oeyak3hy2c6 s 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.pj3tx kl2 yg /;y;uzv -cg,am,
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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 5n r t25icrej9wt gl.0$emf$ 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 )p565vi2,szcd qo syj magnetic 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) is movfcx no.)y1ug3 ed northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentnuco 3gfy1) .xial 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 5fjm e,;kfx) rpik1.mconstant 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 transforq qehv. i8p u*5f:(osfms

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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 revolut82,ldqqvi*ik: nrx (px69 o wkions each second. The frequency of the,d:ip v6 r x9q*iq82kk(wxonl $emf$ 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 devi 1e;.kuz g4lgdce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device j5)f/ sk7c xgrthat

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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 wu/fi1q;q7jp the primary coil then it i;u/7f pqj w1qis 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 moy 6m-+lc8+l3f o kgiuxre loops than the secondary coil thel +k8o6x+c muy3- gilfn 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 pod(4f:pr ev: obwer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant;- 0xjjskpljn( 3s *zt 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 connefmf7 kq2 j,ksb5928 l2kcw+obwzt m1ccted in series to an ideal battery of constant terminal vo2 21c8 tk lwf72 wmsqmbcz,kkfb5 o9j+ltage. 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 ind f3mctpzy23eojz*qwl;jv 29*uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with z 3 *qc f 3w;ltoy2*pj2mvj9ezthe 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 inductanf o6f:jctqp.1d2zv7 y nxaz m- 6vbb+c3, nqb7ce 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 u++0fe(z ewd jL 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 se yzt98 r*7mfvv . wlbyk3hb6fn:to +5au z7g)ories to a battery. The time constant for the circuit represents the time required for the current toh5 mb+gyfvb: tzw*fz9 .)ulo6aryn vt83 7 7ko 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 tz 7ctxnx,f /+h;myb 61q pvhz,o a battery. The battery is suddenly remove1,vhz;bcx ,nhx6typ/+f 7zq md from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same f( i92fivyr*y 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 cuuhlvip1: z7.w xp,u 9s 4hp8btrrent

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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 cief f3 +)bb3do)ma2 kiarcuit, the currentdak)ffm b+a ieb23)o 3

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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 act4/ . k*lreethshl m 58:qpj 5a/nk;nr circuit changes by what factor when the frequency is tri5*n8e; 4ptqk/t hl :emnar5.lsjr/k h pled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inducti*1vscxmm;g5 39:oavye7nw k kve reactancesen;31 y7m 59 mxk:coavkvg*w 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 approaches c./ i)zl,jo s5ko0ziqh+cwd) zero, the inductive reactance of sko0wz5liiz)d ) oc., hc j+q/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 co (/zwu1yjwkcsl:28;w b8fdwpnnected to an AC power supply. In this circuit, the curre1s2pfwj :w 8;wwl/cduy( z8b knt

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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 aw* o3m ouflf58.+pinvjm5 x 0in ac circuit changes by what factor when the frequency is tripivw58mul 0 .im +3x op5ffo*njled?

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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 ze-vzbu8lky8o /wi);ys ro, the capacitive reactance of that capacito8 -yilb yu8s;/ow zvk)r

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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 th/ gbh7od(4 xka3et-une voltages of the inductor and capacitor in a RLC series ci(thu-nk3db/ xg7oa4 ercuit?

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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 is defined adnwgxfj ,gg. wg8m71zqdb:(5,: drbk s (qoi6s $\cos M = R/Z$, 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. e7u- 7p.fpd7cjln ku2 The impedance of the circuit increases if R increases. When is this statement true?2e77 cpudflj n-.upk7

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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 increlm)o2 .m:av6lc hv 6 e8s(wwcsases 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 increasesp3hw 2 :zw; tz5wlevn5 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 circuir1 z;*vp q0gypsj64b jt, the resonant frequency o*1vsbjz6p pj 4; ygq0rf that 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.+ols kqgt5p4sbv97e:-o 7iqi 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 ocy b*51urakaxxrh :l9 6curs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field o/ ,b *qov-hfoyx)3qhqf 0.20 Tqo qo*-f)q,b/h hy3xv. Find the magnetic flux through the loop when 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 r2c wr3y rvuzyco5 3)e3xgi)4oadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the y wxvioyz4ucc5)3oe g3r2)3rloop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fie42y sb + phx,zvmedf42o5 hir4ld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop ,zeh4fpi+h52 dv o4bxmsy r24 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 adjuseq gl4 o )od).m9cbsg/table 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 chanf7kdrvt6:9m iges 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 withyi5z u)n37pnkoz/et : sides 18 cm. A uniform magnetic field is ae:ki nz np5)7t/ 3yozupplied 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 with 15 turns a g ve,p r: toqectev/-uu.,4fw,jzud7d1, 5lynd 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 9mbdye wafy i/8u) 92jo8bc8oand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing omn/fjzm(;o 5span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic om5zjon;fm ( /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 rotate 9ugqpy51arn*s at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while inayn1q9p r5*gu a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 8oyd ,p*t1 4scfny8gf 2bh9jz 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 consi.te w;( rr8pywsts 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.z*r rin: ks0n. 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 rsrnikz rn .:0*otation, 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 wirj mt8i3s )f3cul8fr ipenih+3 ah47v* e 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 construc7l zr(v vk9+rjt a simple AC generator with an output of 12 V maxim lrv+(9 7jkrvzum when rotated 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 genee q8;.hmb8f -cq(pu xerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ope a due9ybb3ow-h;e 0x.rates 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 resis nh4:if0ao4u0ld8: bt v xh)lhtance of 6.00 W. The motor operates on 120 V AC, and when running at ful84hvl0nt :)olfd a:ih4 ubh 0xl 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:b+xpwg 6 bs;a.0 W is connected to a 24-V power supply. The operating current is 1.wb axs;:pb+g6 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 resistanci0:whue(b0 xo;xqyg +e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full s xi+0:g(b0 e uhwqx;yopeed. 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 resistanccv (/ex a4 i2cr)xt:tfe 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back t /i2 (ce: tcx)xvraf4$emf$ 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*je zvf) -5ieh needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of3 sm):y cyff* ax2zq7z a transformer causes 14 A to flow in the secondary. How many turns 7a mz:y3ycx)*sz2f qf 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 110-Vs ;wok19skbxr5z1i4k3 f a ew2 primary if the 24-V secondary haai;zk4 1sf w9bso3 2kr 1ew5xks 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-turnneuj0 +ib2p(f primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curjbn(+fi2 p 0eurent 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 f- hq-k9+im;o0rzzrx3sqa :7bwqd3p primary of a transformer. Assuming 100% efficiency, how many ai0z rp3domxhq3;qw:7 9q - -bszfr ka+mps 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 signxyvwv992,jedtq 4d xb*p +rj ; transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary ,p j;qd d2j +xw4b9y*xevvtr9draw?

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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 ongk8 1x m e9,w*it5qpna its secondary mpn 5ektq *x981,i wgacoil. 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 tv z)(jkhhnl ,u882lg lurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to tz(8l,2lhn h 8vgk jlu)he 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 hasxy7 f+3a spui+ 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current ixsufa7 3+y p+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 ihlr 7/-r8wj)lf dy.qpts secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the ol )8pyw/rhjr 7lf.d q-utput 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 200 t1 ubfnh0l +i/surns. If i bnf/sl+h10uthe 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. The voltacw i; b1c ji9nhl:*ti5ap5f(mge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbeai*:51(c pcniliftmb; 59 jhw r of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steg8vudtd *x0 )y7/q1dkrb qawa- yz*g6 ;tasj8pped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find 78yax0u1sa-ytq6zqw dr* gk; *tjv/d8)ga db 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. j.co :zn( -nqlThe voltage is usually stepped up to 4500 V jqc-z(:.onln 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 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. 18ai0 6fslazu*c4n 6dh+zam iA 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 w*4aiuzz sna+ 10l aihf6 cm86dith 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: ldbxz3 osh,gs4:m z/ 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 enemlz/gd:h bs 3 :4o,xszrgy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much lepltvo to10k7 lllr-2) ss power would be lost if the power were transmitted at 3lllv2 pt0o7 o)-tlr1k000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted by 40jx m.u;k yn rqk51/ngyx5on a line with resistance of 0.60 W. To what voltnyxr m1b/45 g .yyk5xuq;0kjnage must the generator 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 curui ql; :zv27(n3dechvrent of 5.0 A. How much energy is stored in the coil's magnetic fielv q;zhe(v27l 3c i:udnd?

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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-Hc:dtra29tz*r+ f rnt2 inductor. What is this circuit's tr2t2: fr a+n zdrc9tt*ime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltt/ 1eawceze 17age 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 currenk m2*w5: ls-s gar(hncz+t3mj(d;t zrt?

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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 placeik-x pqe1e:3ed into a 120-V AC outlet. What is the resistance of the lamekxi -1ep :eq3p?

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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 7kdgi1q ma2/hjk( y:tpower supply. What is the peak current througa 2ktkqyh dijm1:g(/ 7h the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t; sr/sgb+f*p nhe power dissipatedgf/b ;+rnps* s 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-W9sce ny /*1m.t spq5ml* y*jnz 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 re4bctjq l, .wshmw w 2y,u:d;u5sistor 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 resisd5q,e7 cf5sz :a9xqrrtor 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 induq(0, ljfu d/.ooh8qfxtwojgs48n7- nctor 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 7 c ( c3medpfijluoqj/kq4x. 9a1;6zt 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactancll zwrm6th iq;do m,;h --8sh6;g s3jne?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hzg(-.e cjzjn m )e9ngq1?

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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 a *4*/wlttts r(q4rngu t a frequency of 20 kHz is applied lrws44 q/nutt*r*( g tto it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60 vf m1q9n.7b;e7r/ ti hvyoj/t.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 capaciti m.1-zwip1, nz*sexr ej/gfx /ve reactance 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 caphk7i1jot( p(sbx 6t 9facitive 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 haffld,l;n6hq3x-q 8ups 8 rma .rdr0k-7 vcv7 xve 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 thd1tzl 0 zg l8hdcqp/ 4.o(xjm/e capacitive reactance of a 0.010-mF capacitor be 100 W plxoq/d ldc0mz/1g4zt.8h (j?

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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-md o6ph.dw4k/ sF 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 series circue4mbgz myfq, w9uo:lq+jt,/lk, h 8l+it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance:hykqjeut+zqm,,mlb/ 9fl 4gl 8, wo+?

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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, andetrm;wd( yyokjb1y y 0m,5 (.t 1.0-mF capacitor are connected in seri(y,w.ymy dy rtt jk(m; 0b5o1ees?

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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 H;z:z1:xbgvo cz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected izx1bgc:: ;vz on 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 +4 ly7z kva/p,idaa y4with a 20-mH inductor, what is the impedance at 1004dza7 ,va+pk4li yay/0 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-k2titiof )mj z9*5gh;mH inductor, what is the phase angle at 1 gh95);tiz2*tj fkimo000 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 e3. fmlbc l5n(eq :ie2series circuit with a 20-mH coil and 1.0-mF capacitor for a(3 2ef. q5me :clielbn total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor w1gxnm51p* sxm2 fdu.and 15-mH coil to get a total impedau2 g1 smmx.pnf1*5dxwnce 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 inductor arp rkv:+ig2 yrt* 5. *tfokjayg o2i/4t 5000 Hz for a total impedanc*ttj iyvf:o4ar .*5i rgk+r2 ky/g2ope 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 resistor at 1.0-4 uf. ur5za r0j:cwvog )63wkpMHz for a total impedance of zju0rc6kw urof:a4.5w)3vpg 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 )3nxj mwl0*zdgjrh;gnu 1, q*20-mF capacitor. What is the imped,3m0jh)d*nz gq ;1wg*u x nrjlance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fo)qn iw :0ev*b4k3f1 v ,nlmzkzr a total impedancfzkql*ib1 0v:w 3me), vnznk4e of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fi( r-h+8y brofor a phase angl(yr b-io8fr+h e 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 kHz7n7+w lsloou9 for a total impedance of 45 7so w7no+ l9ulW?

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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 capacitobksh zt n8(59sr at 120 Hz. What is the phase angle9skbnsh58(z t?

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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 1.tsk(; han; z ru ;hqw*w,kdp-*0-mF capacitor are connecwthkk -sp*; *hnuw ;(;rqd, azted 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 -zqa ao,afq8+qvquc .yg:7k.zo:q u 2of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V,qy: u8azcqqqak, .-ofzg + .ua2: vqo7 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 reactaj*z/sinv c3 :2z4r mfdf gio41nce 30 W, and an inductor of :jz f3d on2sm/rgiv *zfc414iinductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angkhm(w7ij- nyj e6e+w,5fl; l heco40a;qdb9xle for a series RLC circuit containing a 50-W resistor, a 10-mF capahk,6 9m;ewl5e d-j q0+ajxhoywfe7b i (l4; cncitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a pha1qtlk1e w t2u/se angle of tw12 e1/qut kl$40^{\circ}$ 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 = 10.0 myy5rrjlua u1p( 0*:4f e)luhyF. At what frequency should the circuit be driven in order to have maximum power transferredu l1lpayfre 5)ru:u*4yj yh(0 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 12r705ptjc r zuvr yn++fdq4j: -.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V por++ dv- f r y:q7uj5np4j0ztrcwer 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*e4(arh( xq ckz r/br/** xugm 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 hor55sl r1 ao5and a resistance of 30 W. What is the power fsr5r5 lho1a 5oactor?

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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 circu qy9,t43lsht6)ia d8l5vntvv it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to ah n5ty8 d vtiq,t)vvl63 49asl 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 frequencppfyaz6iv3;l8jv *8u y of a 1.0-mF capacitor and a 15-mH coil in series?3pji ;yvl*86uvp8zf a

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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 resonac -9dgm;r(t (xuo)vc nnt frequency9xcgnov; )-u(cm dt (r of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor fo1cx shg-wk//axzv)+ y66eyjd dyhm9(r a resonant frequency of 1000djy6) y9ge6xkswyhz+amvx 1(d- c// h Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH c9.t yx +fbfet(oil if the resonant frequency of the circuit is tot (x9fb.+fety be 1000 Hz?

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