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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 unixv aal x-9gqp;o.i32b ts 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 ind)djfawt6 b ,)luction states 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 coil produces what kind of chanw r7fd q2,-wqmge on thrqm dwq-7,f w2e 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 mg sa0k1c-g2u* al;,noppc ;bthrough a loop of wire produces what kind of cgp, n*kcs2ba ;ap m0 og-c1u;lhange 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 x 7,m b1votqt )e*tn/zwhat kind of change on the inducedbt /eqt,tnzx o1)*v m7 $emf$, 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 magne ouoz:t27arn+qlc( 77hbg ,ms tic 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 inducoql3b v0zr10. ,gqbi yed current in a conductor will be t 1.qq,y3bgb00z vol rihat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnetw i3u(o)xlt.tu wxqp(*/mx0r ld r+ 6e is held above its center with its north pole pointing dow.+ pqldlx *xtuw 3urxrm( 6w0et)i(o/ n. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovjro g,7a9cm;6 uvt9ajs n;xf3e its center with its north pole pointing down, and released. As it approaches 9 a ;3vjao7jn,gcts ;6r9xufmthe coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the f) p,sot ;v,vzmagnetic 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 t)vsfop,tz ,v; he 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 magnbn hj ww;9xe6xep ,43t6 *jxcnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed j w6 txw6ne;ph*c4je 9xn3 b,xfrom 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 horizonu,c8 fve(y*9w rv zdngo- z1r4tal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, wc( fnvod z4v8,r- greuzw*91yhat is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing w6t -;rnnfgse fl+3q qz.48k kcurrent northward. Two coils of wire lie flat on the table, nkn-zgq48kqs r6wfeft.+3; lone on either 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 o. 0iz t/t4hiwszh4 y9fay* v4kf wire with the north pole entering first. As a9yz0if/h4 yiskzw4htt.*v 4 the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whose 1etnu1lemhike1k-0yqm0hn(c9 mbsi: 0) hd; direction can be varied. In a region where a uniform magnetic field points straight down, what must be the o9 nqhl1n1dm0mk: ci k1t;hemse h0i 0b-u)(yerientation 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 u h /wjm9 yf*,yl0b-xuconstant 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 th yy/jbl*0x- f9 whu,ume 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.hdh 5 +4v0z+t 8;hbbhldx -dlz
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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 zmb++mo+ 94 drt e7snoan $emf$ 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 field. Th,.f4 7;mt4sw4ewc ihygis u3ce $emf$ 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 m ug*y*a8 lwic8 d/a5cfoved northward at constant velocity through a magnetic field that points straigl88i* dca/yf 5gcu*awht 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 rotates0ec(1s*io mi a at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generato6s;xiat8 v. tx)eah8wr transforms

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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 frequenc+u9gt5c--q8 6o oken saqho5 ny of the 9+o oe-5qo8gu-scn ak56nthq$emf$ 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 det1b*ga(w j)a hvice 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 deviz:z*t,l /ld ul*++ cruhfcw) que/c/x ce 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 coi z6vls uho .ot395y7ht 1iw1zel contains more loops than the primary coil then it ishlz.i3o5e htt oy vz16u971ws 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 coiqgn rfd ftlx;1yf2u.69/hs.cl contains more loops than the secondary coiy.9xsug/ l q .n fff16;dc2trhl then 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 yx- kg84d vubq n0u6hi .y31+)-qeqla cw9jl iinput

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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 resonaqjnh o:f;: m4 9waxr3znt 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 connv5dwu( :ryb0 gected in series to an ideal battery of constant terminal voltage. At the moment contact is made with gv( : b5yu0wdrthe 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 series to an ideal batterykkm-9,7fer nn ln n j5g(5(dy4x:ovcm of constant term k4yncxke( nn :9v rl5,f(dmm j57-goninal voltage. At 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 and resistance R is c2 7tk3 m)xndcl mh4p1xonnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R iy5uzy4uevkk/ :ne66 j s connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batw),wml.+wi azu5 kgc.a tn9l4tery. The time constant for the circuit represents the time requiredk+na9z5 w4lm,). .wtwacil ug 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 connected in series to a battehrbgw/ 63cakk 7)d*ygry. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curr/6yg )d3gbc*7 rkwak hent to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units /e,.bdn v yrq9/zlomvk(,e /yexcept:

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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 AC92k/u s4 b6giox. .c 6ntvwowi power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cn / 01-d9geg4s/fvzhde0 jfqeurrentgen 9-/gfdf sehz/0dveq0j4 1

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance insb /lv9n:0xbp3: umlmy 7ue(o an ac circuit changes by what factor when the frequency is tr 0o:m(n7 uv3/:x9bmu lebplsyipled?

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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 vol wzo ,y2w2 l-l6h;vltltage across an inductor is doubled, the inductive reactance of that inductotv-2 l2,wzl h;6ly lwor

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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 acrokay8jb. a:leqb 709 xhss an inductor approaches zero, the inductive reactance of lkaey:b x708 ahjbq 9.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 powe)s9br ez( gj3tdde;8 rr supply. In this circuit, the currej9)eez8st ;ddr 3brg (nt

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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 changeizk wo24+ju+ns by what factor when the frequen o+ku42jin+ zwcy 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 voltage across a capacitor approachnu ei;. qu99wkes zero, the capacitive reactanc. ukwuqni99e;e 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 j*m;f/s/iks k voltages of the inductor and capacitor in a RLC series ck/i/sms*k j;f ircuit?

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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 as xy9( :t gf(q/x-vvnoj qz)x9 uo88uk rk6ov+p$\cos M = R/Z$, 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 cim1pii+nnzv lx0 / abfot)6scwz)5/j ; rcuit increases if R increases. Wh5a n/ stzxnc j0i/1b+f;vpz)w im)lo6en is this 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 circuit increaq ae( gl 6v( zqs+7ve47j6pyiuses 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 impeda.sfnm 1k6n,fx1j2dl .ns e)ccgz )y f0nce of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series cirt4s+5m/i tv+a *)mv sofjzi3ucuit, the resonantto zvsi+ i s3t*m/ 4ja+f5)vum frequency of 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 voltacgijl q4:cd5(yik( z*a2xr9j ge. 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 seriejpoib i1t pc2:2s0qvig 5 5gx2s RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radidtsu pyo+0x p+9 x4n)yus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paraly 9nt0u p+sx +xod4)pylel.

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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 rqx5.t6f .nng gotating in a uniform magnetic field of 0.20 T. Find the magnetic flux througg .6n.qx gfnt5h the loop 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 un*.arqjk ef+kbfwu 77/iform magnetic field of 0.20 f+wua7q/7e k rbk*fj .T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop /hi9fs : )cttp+pe j*sis reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes 9uu-)ckn+ v4,8 ral7lse hv ggfrom $4.0 \times 10^{-5} \; Wb$ 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 sry6u3*9:szsnr yxx :200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane onr36*yszs:r9ysu xx : f 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 turn:k48tbvt od0ej,+z)rb ;rn ee9rjy5 is 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 ap id+h *3dr-chnd 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 span of 60 m flies horier( cub8; 58m)m negmvzontally at a location where the downward co88ebm;m)cemvu n r (5gmponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 )f +vq63sx urw7 utjon3t-a5 r:f)vvam long rotates at a constant angular velocity of 2.0 rad/s about a3) v)fuov:jr -wr+ 5s ux 7t3nfvqa6ta vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generatorh16)iqxxegh+g x5mw1 has 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 100l8x(. 2sv7zmbmbp(r wmt5 8if turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each l0)a e)bso0 rnyoop is 12 cm long and 8 cm wide. The armature rotates)rao0es) n0b y 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 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 cons(i8n573s vk ;va jpmbuyi-4dmists 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 current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generatoryw km53,r d/4ejebym.; tfxl) with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T m) .erf, kt;/yw dxej3lm5b 4yis 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 ,y hqvz9we1b-5j 0u/hsfv hr2generator 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 re 0 ;edu9pymylcu-s81g9s p3lhsistance 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 y:di21 8 uhs9egjn v50hbtm 9aresistance of 6.00 W. The motor operates on 120 V AC, and when running my:eus092a1d5vgi hjh8nb t 9at 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 88 wq82vr yazpvof-4g 6.0 W is connected to a 24-V power supply. Thewz-a8f82 qyor4p g8v v 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 is00wo88p+ tqyb xon9( davj*nk connected to a 24-V power supply. The operating current is 1.0 A at fullp(0* w08obovnx89 dq+tkyan j speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal:r5 smr*x ihubj6 *gr4 resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full *i jrx56:buh*smr 4grspeed. 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 t e(:(qppq52k pfprz y2o 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 1w5tmucudm .w2u vm g(vragi2;*+ll5 * 4 A to flow in the secondary. How many turns are ii2t;vu 2 r5w*amwl .vdu* glgu5mc (m+n 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-V primary if thiiai; vxj) ;/xe 24-V secondary has 1i/x)ai;j vx;i 00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn sed/iumwz3zf)x.3 4y vgcondary coil. If the current in the secondary is 3.0 A, what is the current in the przvuwgdzi3x y3/ )4f. mimary?

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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. Asq0 pxv:afy4huy.,r 3 isuming 100% efficiency, how many amps at 24 V can flow in :4p.yura3qyf v,0hix 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 provides 7500 V ixm/y5uc1za0su 4 tjayc j 7vy48r6t,at 10.0 mA. The primary coil operates on 120 V. What does the primary a7t4jm1ur65 tu is 4,y0vczjxa/y c 8ydraw?

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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 ogz yr5o ;+r. m2( fdnjswa4*ojn its secondary coil. If 120 V at 2.0 A is applied to .sno ar; r5 yw42 g*dm(jjo+zfthe 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 30-55xrl vc j7o/hmwq*jx4fc)d 0 turns on its secondary coil. Ij- d/l*hwr xcvm4f j5)x5 7qocf 120 V at 2.0 A 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 secut1g 0luwo ,t3)hr5 vm73c vdzondary has 200 turns. If the input current at the primary i3vtv,)t0 rhgu cz5wu7md 3o1l s 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 transfor(dr .7mo(eet eles9ks5g0q3ymer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondstd ek(y3e 5s7gl0 o.ee (mqr9ary 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 transformereg0b5u m:j kqycr 9n.bu-o n9, has 100 turns and its secondary has 200 turns. If the power input to the primag 5uycn, 99r0-uoeb qnk :jb.mry 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 6vlv7jc.;qatbr b n0.qy 7e;x*0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power l q7 cxbqtevv*r 7;bj;.ynl 0a.ine of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vs4wj p k h 3yby79rf4h2/ku4gtoltage is usually 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 t7ykj/w43t 9b4k42hhsp ufgry he 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 usuals n k8zpckt,)2ly stepped up to 4500 V by a transformer and transmitted through t8ks2kn ,pzc) 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 lifwx.zb0 u;xd9 be/tv/ eff/p0ne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the volta/z0xdetpef/0xuf;bw bfv9./ge 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 o-w 4j0g utoo;qqs 1w0ef 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission linuq0 s g;1wtj-4oeqo0we, 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 at 1000 V. How much less p4gv t 4p-, x3w xtrcqni-.i*uhz3bik) ower would be lost if the power were transmitted at 3irht)- *3zx4w.3q-ig kputx bc , 4nvi000 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 b)4p dvprt1xq7uwb+9 es6s u7td82lf ye 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 94pepb) 77s s+t rtu2ld 816yfuwvx dq0.010% 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 carriess fyqs.7n3jnxt *v6; c/gztop2oj;n- a current of 5.0 A. How much energy is stored in the coil's magnetic field?;* f o;z76oncn2j t3jx.npgqsy /v t-s

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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 resi p0m2da/,;sk7ewp.tht m9tanstor and an 18-H inductor. What is this circuit's time const/mh0ma,d7. e2pnsa ptw;9t ktant?

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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+kr-amugt)3 jasz bm)(ei1q+ 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 Aqm+l1kmqt -3r; -a819r;w4pxk x bkjobsr-avC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What i n((enk1 mw5 lawlnd-:5 )mxdbs the resistance of the lam1dn(n-wnl 5ml wm(5)kdx:abe p?

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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 a.:o5lwfwa p+ r6tiz0zn32bqg c power supply. What is the peak current thrzigwnwr 0o653.+z f:2q bal tpough 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)bxkp a e8to; ip+9cn4he power dissoatikp ; bxc4n8)e+ p9ipated 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 i jqw3 dup*01da 50-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 5nos6o x)q4ft-e;dcp ;0-W resistor 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 resi4w95(sb pqxafstor 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 inductoowaa+ ,8nvzx 0r 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 reacajk;9fr6o dae)3 c:he z7p z2utance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a :b 781lned jo;amn (va14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance;nf.b mc4/gjc 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 auw6wdv/ hw q55 frequency of 20 kHz is applied td 5wuhvw/5q6w o 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, 60.0 Hz;u: hz)ni:t hc:y6iob source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-m4vz r 0 4y/6f 6gl4sdayfhjpsr26cw ,qF 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 capacitive reactanq/)n vned,*i fce 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 120 7he./ctb.ft0b8 diik 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 the9x 2ztidbdxczls))t(- a/ee/ capacitive reactance of a 0.010-mF capacitor be 100 Wtsx9cxl i) b2a-/de( ez)t/dz?

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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 capacito 5(t5hzsybjr7q w5 c)zr 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 12.0 W resist 3dwwr w/.fl:*vff3rgance, 15.0 W inductive dfflw3wf/g3: w rr.* vreactance, and 10.0 W 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 atmv.kcjlu.i 2 j6,zn97 o yvys5 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor n,59sy6iv zu 2j .c.7ykovjmlare connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angl q,0wyeuk9-yqe at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar y,wuqkey9q-0e 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 :6klxh9/g4j a et-c* +lz qycfis connected in series with a 20-mH inductor, what is the im+tc/ 4 :*zqlc9 fyxkaleh jg-6pedance 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 rfhg,g vrmn:1 3 *6hglis connected in series with a 20-mH inductor, what is the phase angle at 1000 ghv,lm*:gghf r 6rn13 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 serzj 4lkjhj,lv:m x i am*1i+w*8ies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance oak x*:jm+zmh8 jvl*iw j1l,i4f 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 reszrs2 (1z*ltlmcv f k4p .z6xs+istor and 15-mH coil to get a total impedance of 110 W avcp .m (2x l*6fskrslzz4z+t1t 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 at 5000 Hz 2t8hfqbp5+s .v v 1rmi5isa-av7s vr.for a total impedance of 40avm7-qsspif5 5v h1. isrrvv+2a bt.8000 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 4esxwu *;ghss0qbx.6tzd1 s;a 100-kW resistor at 1.0-MHz for a total impedancs;hgds 6bt s* 0s1xxuq;.zwe4 e 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 20u ktpl n xtl9gjg8 -8,drb27k+hz-1op -mF capacitor. What is the impedance at 10jtdz29k,7lgb- gp1 k8hl-rxpt8 o un +00 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 i3b my+zxc7.6g8gre h rn series with a 10-mF capacitor at 1.0 kHz for a total impe+hg.3bxr r7mce6 y8gzdance 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 ig(va+fiaocg4 l(0jt--3ahe u n series with a 10-mF capacitor at 1.0 kHz for a phase aa-jli g cgo-a(0e t+vhf4(3u 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 sy r)65ruvb,n at 1.0 kHz for a total impedance of 45 ,yu5 srvb 6)nrW?

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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 in f aneopl7q;p6 .ae0/s the phase ae6fpan 7/0.;aq oen lpngle?

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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 enny1qn- utqe0kewsj0eb*9)u ,-) qj5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i we 1yj qe-*j0,u-t0 nk)squbn) q9eenn 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 15 jclr- wdb4o qe)l:2x00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected t5qlb -j42dl c:e)xorwo a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an if pxg0i 5 ls n9-jt9-(phtxpo9nductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current f -09op9pjf hispg5 t(-ltxn x9lows 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 conta rc:re :b-5hj6m51, t ;brdevh /qpnraining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor -q vdj1recra;nrtb/ 5 p6:h:hb,m5re, 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 q k6ltgq tur :r/b;27qa phase angle of qgbt;qutqlr2r7 6k :/ $40^{\circ}$ 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 mF. g 6pifoy.o7 /4fqto b; *xisq;At what frequency should the circuit be driven in order to have maximum power transferred from the driving sfit;ox6i ;f4qp7g/*o oqsby.ource?

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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 onej 5tb:205mdxro:1ve , fer series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit i v ned5,21xb:r5er j0em: oofts 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 gr c(p +yubvb7d7-1ia6ushfpu) 9 0 vjcircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 yk kysi.5l 22rW. What is tk yyl. s5ri2k2he power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing q/obu)wq 7h3*unh n4p a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co7wu4/)nqbhqn* 3 uphonnected 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-m+gs 1t5 zl:++ cx.ylx p9wycpu z+ngj2F capacitor and a 15-mH coil in series?p s+zwgycpjxx 5utcl g z9:n .l+12y++

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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 serieci jy-k4sx0 -qs with a 4.7-mF capacitor for a resonant frequency of ji 0cys4q--kx 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 ne -x3 h(w/vn5vcho+t mweded in series with a 3.7-mH inductor for a resonant freque+(3ovtmcwwvn/ 5 hhx- ncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placedwu)i.zipdihn4 v-m,u5y:z .nsr9ol. in series with a 30-W resistor and a 40-mH coil if the resonant frequencysimz4-nh9 nuiz ydi5 p).o,..lrv :u w of the circuit is to be 1000 Hz?

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