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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are unitstdgdt5f8;z dafq naf r//xs6-+ ettvn)o28*w 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 indw(op1*z r ruvq. h vf4pe h8,g0oiq52ouction 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 cha+;3k70wk caqfu0u(ho p/3h gkv0bp qynge on the induck/0q0 ; hh0ya7uwbgf (3o p+3qc vpukked $emf$, 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 throughvg6y6rvy.d v )u:m rl( a loop of wire produces whatuy v6(vrm:y.v)rd g6 l kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire pwuv+q7 9j id/wroduces what kind of change on the induci+v u/qj 9w7dwed $emf$, 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 f/-hl ;gi 8qdhgrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a cond*yv(vej/1 b :fxyp 1a,y n6xmiuctor will be that which tends to produce which of the follon 1myp/6,bax1x:y ij (efv*vywing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held -p(er+hqyrh)mv/xli*es7; t th9 l a: above its center with its north pole pointing down. Thevhhm* qt:sey)7il9+/x(lrer p -; a th 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 liessy4tj 1u4ol4 qpz+qa2 flat on a horizontal table. A bar magnet is held above its center yaujtz 1s+24l4q4 qpowith its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a reg03u yjaw26bkb ion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induc3a6w2kbyb u0jed current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a reus;93 o j xp-b6cne3iegion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the inducj-p b9u36x; 3osein eced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magneti 7t.awlr jyw o4sl1t)-c field points straight down. Th7 wats-4y .lwlt) roj1e magnetic field disappears suddenly. When viewed from 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 horizontazdgld-ponxqh8*(+/z bsv( r +l table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When vxl r v8zdb(o /d-gzns(+ *qh+piewed 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 yi b*bh*ae 1:ac z87hja loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fr:bi * ah1a87 cjybhze*om 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 abpxgos 9j+a2+f 7t 7xfn axis whose direction can be varied. In a region where a uniform magnetic field poin7+f9 obsx fp7+tgx ja2ts straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at consruo2xa(h 1//uuiy.xvtant angular speed about an axis whose direciouu.(/ ry1 x/vauhx2tion 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 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.8iq/qbxdmjly-l)e 6 4rcr1cfo7r6 zbk*w -u4
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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 a y bx mjo/sok3bm8n51vr 6wg11n $emf$ 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 rot q ,;y5u8z+txzs7aeld. 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-g yaw-3z o;79i xn2 hc,jznkn2west direction) is moved northward at constant velocity through a magnetic field that points j9iy2,oc 7;-x khzn3znn gw2astraight 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 rotacrp 5pcx2/d8b,kmb-de8arg,wbx /*dtes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transform xh4ancihs9 we7e9k0*pi9 v4is

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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 fytb55 -z b)1s8: kf:rcco diecrequency of thd)c8 c skr : y:b5bftoc1-iz5ee $emf$ 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 used )) v+dw tqx rk.xcoy)s7nvf1/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 df 6o1cc 0 cnd1(md1*toe w4n 6)kc4mfexc7f bpevice 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 hf i8:zchdy0jgp 9.-x contains more loops than the primary coil then fh.0 pi: h9g8ydcjxz -it 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 mocf)(iv58bthpv)vr- o re loops than the secondary coil then it v8- ()vrpchb)i ov5ftis 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 pow z4+k0zr ,zuzeer 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 circuitp *jzbwb0olja*+ddby p8 q8do81 3e k/,

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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 connected6omh-u-dnc3 c in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vo-c o6u-cdnm3hltage 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 an2 /:;3jvvqoc 5gx,dxl kov)s+an /hrj ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrh jxavg,okq; 23srx+l/d)/ 5vc on :jvoss 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 conn,o5yythnuy39y(k3kvmy. e z.ected 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 is conne,3.x)i ybn8 g 1uxdh4rps5cbrcted 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 arek2dcc e ,(z1tcw cq(op6j v4-t connected in series to a battery. The time constant for the circuit represents the timcce64qc,p( ( zvcjd-tk 1otw 2e 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 connected in series to a battery. +qdto eh:cc7h6cb5+vd 0n6yhThe battery is suddenly removed from the circuit. The time constant for of t+dc6qv 7noy 56 :+chebhc0hdthe 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)9w;ozx p ub9ayl1p-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 n 1ea25 / +ys5+8bntm ilm1bfdok7s omto an AC 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 suppzt7(o j,c+)et 9xw tksl)d3uvly. In this circuit, the currenwcz+l93tedx,u) t(js ot7)vk t

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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:) sl 2;0pgnbngrfn;l changes by what factor when the frequency is t)r 2nlp ;gf gln0ns:;bripled?

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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 th lg;jl rfw)j8,e AC voltage across an inductor is doubled, the inductive reactance of that inductorrg)j; 8wl fjl,

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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 zero, the n4u+r * 2uqwwcinductive reactance of that coil*+w4nwurc 2u q

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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 th8ovb d id0s08.;vxdnro 5t8 sqis circuit, the currento8o 8q5;stdvsd 8nd. xvi0br0

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what facto g5in n4hw;ok-r when the frequenn4og hw5n -ki;cy 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 vol5/bci5 iky 5(uty: vp0en; hqftage across a capacitor approaches zero, the capacitive reacta5y 0bc5 (hty/i uie:;vnq5kpfnce 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 p9 tq8m;70k/+q zpjimb0qnc*u,wr m zbetween the voltages of the inductor and capacitor in a RLC series circtp 8,z7q9 ;npkmqwc0qrbm/ * 0+ jzuimuit?

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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 16cxkljnf(kr.c-1 tk 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 circui5; 5tudvo r7. 9ijajsq,:2s,cdenfxu t. The impedance of the circuit increases if R increases. Wh5u j qdec7,,:n ta5rdsisxo2u; v .fj9en 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 impmstx:xa10bdw/7u a )jedance 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 ctlj8i hevo )1 c.hywpf4t43z* ircuit. The impedance 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 circuit,*0eyqh/d qy3f the resonant freyy3d qe0qh*/f quency 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 voltage. At resonance,5 64k(ugyucxus 4e rrflbqf ;82 y(q3s

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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 bg et/-kl7+xo 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 radius 0.10 m is rotating in a uniform magnetic f aly7r3bjvgod:;x9gjnm -- ufht 4:ii.kwc;3 ield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t g7kni-;.3xhj udyfa;39v:j-i cl 4rb:mgwothe 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 0.1i* wl5*p 0marn0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when tmp5l*wi*na 0r he 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 0.1d12d zgkslk;a av/v(r )(e4dq 0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plan(vgakdazdvd( lr;1q 4ke /2)se 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 is reduced fwo wr 5zgr: vp,e(d4f+rom $1.0 \; m^{2}$ 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 coi* ,rt e8sjc+5nzmlr8be)/hoa j )o)bel 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 wi7ls 0p+5qzu3z+zj+1ke gre ycth sides 18 cm. A unifog qzjpz7e +0rk+zsu lc3+y1e 5rm 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 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 m)oc3m/rruhs*zu-g ta ,s3a a.5m wc5turns 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 area 0gat52,i xj3/ ;xjw-wrxolzh 8t drr2$0.20 \; m^{2}$ 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 hc4r vt m)*bh*morizontally at a location where the downward component of the *bv4trhm *mc) 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 m long rotates r6na1 x :7,(mr mdoal)j2oru mat a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetr u7rmad a1ml )jmn2(:,roo6x ic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional +hu2qygmdo8r;y k(x )f/da /)tbfq u8area 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/ fyp+r(7kh xt of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is u,g43+yjdonun6 * m ya12 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 r4+y3n doj,a6ug n*m yuotation, 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 consism9h u+z dl 6)t22qlawuts 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 generator wi uwbfgrv6+z4 ,7dbp 8nth an output of 12 V maximum when rotated at 60 Hz. A magnetic fieldvfgbu4p,z6nr 8+wd b7 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 gendcu)1v(v ia j0erator 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 o1gd oc/a- kr9W. 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 resistance of 6.00 W. The motor operates o vgz..y bx(z4hn 120yb.4zvg (.z xh V AC, and when 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 Whr9 (tql h134s7yv/q oc1unws is connected to a 24-V power supply. The operating cur vtsrqw3h4lqus1c hy1n7o 9/( rent 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 :cvzzpo:bnpcjv y-6n 5;pp05 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What i;p :pn 5c56z cvopnzyp: b0vj-s 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 ca g 8ow*z:eh5to a 24-V power supply. The opz5hoea g :c*8werating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage fcuv(6c n +6we, acn.xspgm-a16s y8gof $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seconnrf10;x-a-6ty u sziw2;rdcc dary. Ho02x6 s -c fu;ctyn-a;iwz1rdrw many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turndb1fk , /2nfn-f exngy* 0w6dos are necessary in a 110-V primary if the 24-V secondaryyff db kogwn,20 6 efnd-1nx/* 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 consistssko q4g;08tmwu6 r/ rkns(s:kku0a/ v of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 k(s/u s4a6r0t w;v 8mk:ks0nrug / kqoA, 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. Assuming 1tjwthmx040r5d w ucq,, 9ofu200% efficiency, how many amps at 24 V can flow in thw00o5 wm29 ,,ucdj4 htqtrxuf e 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 sigt vzflu-c7: 2kn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the u-7v kt:f2czl primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sh;40(ktg6c)uhuj +gde w+ fmpecondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present i(ghwk6u p)udm4htge0+jc ;+ fn 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 c esr5vb 3)jm8toil and 300 turns on its secondary)r b8e3 5vmtjs coil. If 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 tur 1a kiwi99ey6)ig c:imns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary tiaiwg6 ) k iyc1me:99io 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.9, 9iv0;jxdm m*rtoeb /fr7ph If the input voltage to the primary is 100 V, rm/op9xvr7*t ,0mfb 9eh;i jdwe can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tui*r1b33f v leyrns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (b3v lr31*e yifneglecting 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 r rrd99h9 +pmgcurrent 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 secondary if the primary hd9+ mprgr9r h9as 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 iss30zacm z--il:h n2zd usually stepped up to 4500 V by a transformer and transmitted mls z3cai 2 h-z0:nzd-through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 1207h3pyn 4x- )*qi0reynzy sp/v V. The voltage is usually stepped up to 4500 V by a transformer and transmitted througs0p3- rv/znp nix yy4)h*ey q7h 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. A genlyc 4qv72f,5h sx1g f-jwe: lwerator produc7eqfys51lwgfhx4 :jc- 2,l vw es 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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.md60 b65uno.rwbyk + p60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost wurw6p b0my+.6knd o b5hen 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. Hoyw x5tg 0p2)qyw much less power would be lost if the power were transm05w p y2qxtyg)itted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be trarzh8 s,g a9g9qwf( y*pnsmitted on a line with resistance grq8pya *(fh99gs, zw of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How muc1 i3xn w4o -roh-q.qgah energy is stored in the coil's magnetic fiw4q .xaq3 o1o- hn-grield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H induc1-kfhu- pa -slur i*p9q (0ilxtor. What is this c (pu-0iaqhf l *9-1x kiup-rslircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltagt ;g+ o7yvc 6hzapk8c4z7 gsp4e 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 0qczv:d* refxbh+h;p9 ix+m0 120-V AC 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 is the resistance oqiyx . jo6m8aueeji5tr0u(+ /f the lamp iqj.ou(xa65ur/y+mi jee 0t 8?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the +ap)hifk a5 7qs,7nuupeak current through t,5npqai)kf77ua su +hhe 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 co .*lm 6lqg8lccl0lbl,nnected to a 120-V ac power supply. What is the power dissipated q, mcllg.l0 86lbcl*lin 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 50jp0vm3q x/;9f xoexr4-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-z y+arjg w94r 50-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-sg6e . ;c0zuxpW resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inducteeoo/tz m 5 71xi)2cahor 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 reactancappr h0s v8tk hdkv+ms /41::ppacl*. e 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 wil.m(r *ia6atont . :ejbl a 14.0-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 reactats (t+pptc2p3j4:y*j6bx gp( e tavc9nce 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 atj m2 6 /xrjr9flvp8ot* a frequency of 20 kHz is ap2 6jv8r9 lt*mxoj/f rpplied to 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 ppf8.us9h)( g3jecs pfg yi4/Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cazs bew;5hj3q1pacitor 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 reactance at1mc u o4i2un4s 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 . 3r6iiug3nen .xgvo p(6 fx5 scrs09qa reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a3i:w ifbu4* gh 0.010-mF capacitor be 100 Wb:h ifu3*4iwg?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000k5vvcauoz//.sqg8p qf(i +h*8 j4o ax 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 circuitf)z80 b, mqjet with 12.0 W resistance, 15.0 W inductive reactancm0j zq bf,e)8te, 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 at 1500 Hz if a 100-W resistor, 20-mH coil, and7 r. .x x.ttn3hk zc,(jlszt2d 1.0-mF capacit73x .kxzs,nlcttd.tzjh r( .2or are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100hzdei/ 4q(aa9 l7h,r t-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteddz a9,i /qlh74ae(hr t in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20am(il9;a8dq,v sh ) gy-mH inductor, what is the im( qa ai8my9)h,;s ldvgpedance 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 withmdrt: .lzwj(w 978a qq;bh e.d a 20-mH inductor, what is the phase angle at .7.9q(r 8w;:lwd e q zmdtjbah1000 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 serig8 n +u7xlo+uzes circuit with a 20-mH coil and 1.0-mF capacitor for a total izl8+7u+o xg unmpedance 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 capacitanceb g;07nulc- kqs is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?;bunc7kq0g - l

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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 withpu9;z* pye:d9ib 6pd l a 450-mH inductor at 5000 Hz for a total impeda *iepu9y 6p:;9db zdplnce 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 mustcaa oex.pe 63-12hecnt0 4wb9c0crxf be put in series with a 100-kW resistor at 1.0-MHz for a total impedan efoce xe4 w2091b-hx3cpccn0.r6aa tce 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 imvwj .,osugaw:o7b1z1 pedanbzsjo 1w awg7.uv,:1oce 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 with5u3y *y jbzbd79yviy3 a 10-mF capacitor at 1.0 kHz for a total imp3vzu 3*ibbyd 7yj9y y5edance 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 ser0 *x5/2(q3ljqcgjywp3 nund vies with a 10-mF capacitor at 1.0 kHz for a phase acn3qlw *53/jnx v(qy d02ugpj ngle 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 resiser;y-ui- 6mng tor at 1.0 kHz for a total impedance oe-;y-iugm nr6f 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 capacit3e9 a3ujv. iljel( 0axor at 120 Hz. What is the phasej3 j.ae9a3(ill e0ux v 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 i 8/kt1wce- jix75h lqyf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor a/- qxleh5yi87k 1ct wjre connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 1:zosje sxj42lm)v61+ puula 3 +y;ylx rj+ 3rj0.0-mF capacitor, and a 0.350-H in pae+yj6xl2;j 3zrsm1l:jjly3 +s)4+x r u vuoductor. The circuit is connected to 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 2+ ulrkp*:sku8o).gip eai4g8cyt3m inductor of inductive reactance 30 W are2ucu p+l.)8rpkys im 3k e8ia4t:*gog 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 angle for a se hdgbg0cg:ku)y .z 3cmzr+sjs34./ re ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 63germ.zgd:uk. / bgz+h3 scs)40c r yj0-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-wytgau8tiz)bi mme / :59q.lk mc0(e1W resistor for a phase angle ofa0m 5gmi e .b8k:i9wmy/tlq1(ztc)u e $40^{\circ}$ 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, Cb.m.xpf:w3da = 10.0 mF. At what frequency should the circuit be driven in order tobx 3.wpf.:dma have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac 8c uqmc5(hwut9+y;adb*p g e e/nbk8 -series circuit with 12.0 W resistance, 15.0 W inductive reactance, and nyume9tcb+q-ckg8h;p ud8 b*ae5 /( w10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circu3 dgr08t v2k9kadj f3xit 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 W(elr5hmam9c 52 w/cmq . What is the po/c5a29mq mc hlrmw 5(ewer 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 circuiwzwzkg- 7qg,1tdj0 /i t containing a 50-W resistor, a 10-mF wz-,1 7gdjktqi/gw0zcapacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seris)*z ( qv1,qxhk1 otjaes?q ,tx (o*k)1ashz1 jvq

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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 4.7-9 ooos s.7+zvmw zwliv6)v n;0)2skgpmF capacitor for a resonant frequency o0k9 ;sv wviozm) 6wgz.pons7svo l +2)f 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 forfiqol b .8ba;;a91-vt hu(rzb a resonant frequency o;lbf1a9zv uhbibt;qr -8 o( .af 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 z8(36 m9xu wdcod)eimt3bna3se-o u3 be placed in series with a 30-W resistor and a 40-mH co3c(b d mu-8az6n9 )3otisxe oe um3dw3il if the resonant frequency of the circuit is to be 1000 Hz?

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