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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic v2 c9(ywglnaff lp*v( p3+cg: flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that 3 *s2nr ;,qhdan oby.s6qwzp7the $emf$ 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 0q 7pzayboo u4m4z6 ;vloops of wire in a coil produces what kind of change on the induc4z6 4o o;vpaz70yq bmued $emf$, 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 thr7 e*5l r8i l5lle2u,4biad skfough a loop of wire produces what kind of change on the inducl e5sibl85d,2i7l*4 lefka rued $emf$, 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 wirz1wp t yzygjk.517u 2 f01yopbe produces what kind of change on the indujpb0f7.y1gtzw15 y z1yu2 o kpced $emf$, 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 magn1n5 o/vre u22qwwm9vxetic 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 conductor 9 ,v+mj;ryt7 d)kdm)j* kiaod will be tikdjoy7 ram ,;+k9)d)md t* vjhat 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 baru i.7mx/8m eir magnet is held above its center with its no87m.i u ie/xmrrth 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 horizonbyl),am: s4p ltal table. A bar magnet is held above its center with its north pole pointing d:p4l) ,ams ylbown, 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 rem/*/ zn 2vyzcmgion where the magnetic field vector points stzm*2/ vmc/zn yraight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top wpn0yvdpn s3,wphx:;o ,o,v 4in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of thv:0w, 3,d;powhvoy nppn4,xse induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top inm8ul6q0x3n8oqq0id j) ,:udw f 3glaz a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the df, 8iwn mluo u0qzd3xq6j3qa: gl)8 0field 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 horizop,3 4hujscil2 ntal table and carries an ever-increasing current northward. Two coils o,sjlh c4pu23if wire lie flat on the table, one 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.exw8 *sgrr8 ah7kr0z of wire with the north pole entering first. As the north pole enters the wire, the induced current will bsa8 r87x hg0*wrrz.kee (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 con+8sq b) 9 hvu,hwvpowaq :*m)ystant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what m vp)*wa:ywho mhq8bu9sq,v) + ust 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 wirn2t wk1wcx/0k e is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the onw k2kw/x1ct0 rientation 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.3 guhu8(l8irb
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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 th9/yc g6xd3mie ahlhpg*4.i8 uat an $emf$ 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 maj,2b/ljvfcm/ kn1m- ngnetic 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 thedoi22+src r w: east-west direction) is moved northward at constant velocity through a magnetic field that pointswirocd2: s+ r2 straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a 7)aam(s6eea bconstant 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 transfz- lz,zpim)9uvc /sy;5zmpp)dye7*u.sw ti 2orms

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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 revoluti5zvq9n4lkms/+ wkz g3ons each second. The frequency of ts3 5 q/mz+z4wklgn9vkhe $emf$ 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 ushoz2ym, :zhm, ed to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devidj3;qonf g 54.a eky7fx.1 rb6a wf5yrce 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 coejbzumfb*zg2 +/;; c antains more loops than the primary coil;g; b+bjfczz2 m/ue a* then 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 more loops than the secondarp3qj5p3 i ly3+sh/o pbat/u;ry coil then it i +;3b q 5urpy/ips/po hta3l3js 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 inpu e7 5vymd6p+qct

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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 cirg6k+ovq9c zbu5m/;a zcuit,

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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 connezp we7vz:6ef:7fh0 hs cted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor:7evwz zhphsfe:670f 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 conn wq.0csby.:vpected in series to an ideal battery of constant terminal voltage. At theq b:pwv. .ysc0 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 csre,vl /fvz * 7na:i:zonnected 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 conn:nfz* .m(b ziey /0 fcgwoh39uected 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 inducb6ya9hu ;ig mr865uvt tor are connected in series to a battery. The time constant for g5ua 8mit u; vbhy696rthe circuit represents the time 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 connec/ .y6ilz.+ c5j uogdqdted in series to a battery. The battery is suddenly removez5q /oijy d.g6u. dlc+d 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 units except:t*um m );gmk:k

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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, th3odj9-etxi x/e 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, the7(iws x ir)ew+ currenwx+ir(s) wi7e 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 changes by what factor whjr(z*x/ dxc go2sif w;ew2 )l,en the frequency is tripledc , ;iwfj2 lwz/o(e2dgr sxx*)?

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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 voltarr92 v(ukn)y3 k ks-nege across an inductor is doubled, the inductive reactance of that ske-v)rk 3 ku2r(n9yninductor

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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 ACabvykw8(w/) c voltage across an inductor approaches zero, the inductive re8)wbw( ca/ykv actance of 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 uurtw,tb70 v- h1 -wuvpower supply. In this circuit, the current0-thww u7vu r,buv -1t

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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 fax5b0/ve lujgg.p-q1m; k ; nmzctor when the frequency is tzb v-0enl /m;g.qxpu mk1;5gj ripled?

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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 vol0cr9 a5y j kxe ;h j/ir2bu2))+w*-kunyxp zjytage across a capacitor approaches zero, the capacitive reactance of that0bh5;ieuu2y )+yj*2/ p -)krxjxw a9 zkjrycn 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 anglere6kj0,c rji, between the voltages of the inductor and capacitor in a RLC serr, 6kcej jri0,ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined ts08c7 *sb*qmxg ddk (as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Thv i:d2:sx(p j l h:lpbgw .pf7(l+ipv/e impedance of the circuit increases if R increases. When is this statement trdpl7pg ((l:jpxisb/:l.if+ w2v: h pvue?

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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. Th6naudxdu:3rddr5s552 3 hetb e impedance 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 serieg9bci h5unlg- .,e yj,s circuit. 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,7a4(cjtwa0 * ui;kucu the resonant frequency of thatuu7 aw ;akitj 04(uc*c 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 te ; 6tnkr8ownkmd5 9w2hat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serie 7 +a:pdrc nqtb0s;1ipfqrm )7:d+ rvys 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 radius 0.1 9m6:6 piup+ nx hxinl(aig:s70 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wn sim9h6(: :i ipglpx ux7n6+ahen the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is edgx7dv*o2v6k2j c )zrotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loog*e2z) 2j 7dvvxd kco6p 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 u u58 3i8ej,n/j zbhoqrniform 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 at an angl nbj / i8ez85jru,ho3qe 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 isu( bo .xgwpwqx w1pfu*rn,2*5 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 chz(db3ko1ah1(/ v crdbanges 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 fra; nmmrbcj2cp6*jbbae 8 e:bgw)1 ,z-4tnb5vvme with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of wb81ambej5*n)-v z b4ej, tcpvb6;r:nc 2gmb 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 and an area m+9h 8 oye)dveoqbp.mrry 00 2of $0.40 \; m^{2}$ 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 arb2as9vxwii: (ea $0.20 \; m^{2}$ 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 l -wr tik .,vj4y)p:v x4y6vciof 60 m flies horizontally at a location where the downward component of the Earth's magjr)- yv4p4wv ,. vixk6 lti:ycnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a zb*:i5h; zwhj/xj+ s hconstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mabj*/xhzh i z :;5+wshjgnetic 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-sectio19rj0q pui5bfnal area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of ws:,-a/:e0jkla*f:zeu qa t p qire 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 armaturn b197o ;feutje. Each loop is 12 cm long and 8 cm wide. The armature u1njeb9f; 7torotates 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 consists dldn8 ;g1 xkq:/v xbd (a1v ug0;jpod+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 generatky3;99k9rkn*r +aelbi c;6w,lrnnrsor with an output of 12 V maximum whenirn kk3k9ne r; 9ry9;a*b+6snlcrw,l 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 .je op07ca v,6i 2eetfgenerator 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 mo d,i by2,jqjh,6h+ rc6-nc ghjtor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.ax q1ymxw66qo4i hb)r u.vg28 The motor operates on 120 V AC, and when running at fu1qg4 x 6ymr w6aq2 8iv)h.oxbull speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is y rut a-6qvvc*6g: dr(connected to a 24-V power supply. The operating current is 1.0 (*dya:t qvrucv6g6 r- 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 resi6ch* j( gwro 8(yae(de tqk,.mstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bg.(drjht(6c ( m kea,e8 q*ywoack $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V p z2l 2uv)qou4ehl f7.fower supply. The opera) u2lz. f ehf47o2vluqting 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 nr 9rw t/ly;e e;kuo60xeeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow i:b) 4i:)hyog (fu bimbn the secondary. How many turns are in the secondaryg::4uhbyf)ib)i(bm o ?

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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 1; nkq. c64x2zwkf nyln2r. oy:10-V primary if the 24-V secocynk2yf o:rnwqlx4n .2k;z6.ndary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary 1h um4t ,.srywhl )rj7coil and a 2000-turn secondary coil. If the current insrj 7h) l ,tuh4rw.m1y the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of o 29 +42n hdjm5lmnk- yppaj)sg(zol8a transformer. Assuming 100% efficiency, how manyj-28znh) (+9ymsmoa lj ldo2kgnpp54 amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a -dt1iddl s65wneon sign transformer provides 7500 V at 10.0 mA. The primary coil operates od1l di-dsw5t 6n 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on +*ds r fmvhk(z3.r4hy:nt x2k f1kzs7 its secondary tzd:37nk.vxk *+2f1sy sr fkmh4(hz rcoil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns*4fen 8q skas: on its secondary coil. If 120 V at *:nk ssq48fea2.0 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 secondary hazrve 9r** ftu6yxt)jh acp 7sa779:ajs 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondaftajarc:p 7z6tr u7esv7xj )a *99* hyry to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has c97(vntv, z w2th7etp200 turns. If the(,ten 29c7tvptwv z7 h input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has8;hzu6;3gs yj fmh+u t 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)h;t8 ;u+yj3zmf 6hug s

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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 of5y0nk(p da h9zsloc )emy82* s current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tota)yh8kso d9pm(2*e aclyns0 5 zl 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 cu y xll( 1yk/g3gw/mtz9rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transm9 zw y/lmxgk/l3t1g(yitted 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 120 V. The voltage is uyvt6.g ,4s 0ry/5z(tqrpjj nrsually stepped up to 4500 V by a transformer and transmitted through a power line of total rt(srqj ty j,yrn6vz0/ 5.gp4resistance 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 total9zg y 4kse8h/.6cqyta4bo1j 9 9rw doo resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of8 1yaqsk4o9do9c z4.bgt/6hje9ywr o 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. xh le.y5i2t5e A generator produces 100 V at 70 A. In order to reduce energy5.ey2li eht 5x loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power woulx/o * vej,2fidd be lost if the power were tixv ,*2od/j efransmitted 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 transmitppv9fhd. yo;0 p;bcv/ *wld/fted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer ivvdl .*hf0 ;o/fd/ w9pbpcp;yf 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 much energy is stored *q wpq; r2 74taktytk*-savu+ei 6rp/0oc2hf in the coil's magnetic field?+qq64oh-;a* f uvy 2rkprwtc70 /t2 etikaps*

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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 inductor. Wx/)-u;lba cv85bhx 0qf ut 4wzhat is this circuit's time constant-a0/v8flbb )w4u txhqcu5x z ;?

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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 whereqb m1g+i;ntyrz l y fm9q9103t the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curr()must j rlwu/vydid8sy8+w g/ * ip6+ent?

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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 i* zc p.9 .vgya7doc i(mq2cx*wnto a 120-V AC outlet. What is the resistance of the lamx2w(ygd i7*v .qa.cc* 9ompczp?

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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 powe:zfq2 a; tq3zky p tsr5/10exkr supply. What is the peak current through the3 ys qq; :fpr2takkex z/05zt1 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. 4mfgz1 9 z.yhoinb8;aWhat is the power dissipated in the resistorhf4mza.8n1y iz ob;9 g?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is y,fgj5arx( 0 nqtpr ;ew(. gcx*qw(4g$I = 0.80 \sin (240 t)$. 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 woowx8,qy6csiq1gldm*d . * 3a 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-W resistor is dh;5*p.ky imr$I = 0.80 \sin (240 t)$. 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 inductoog8 )5re;fwt sr at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hzwbrv kyx)b:-(,vuo0 j pyn(k.f: v*hb?

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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 reac w2(og ks(yj2gtance?

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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 ata /gww c3 pg70d nwvky,k17;bp 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 1203flt:j ;zizw 9jj4a6;jj4 ipahpf49i V AC at a frequency of 20 kHz ish43j9atfz ;4; 6ilzpaijfw9jj pj:4i applied 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-m :.66a q3j kvq7/2rz xp1wxxhkdy v1cjH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at t0efbyp6w7 *j10 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 reactancey;ka59d7w cn, dhj+ytf-qd0 d 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 capaszd .16jmmmo- citor have 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 the capacitive reactance of a 0.010-mF capacitor be 100 W6v jl5izvl mu qh0;:c--6 qhvjuc :5zill0mv;?

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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 1000 Hz andoff .fl) y u q9 :wor(.zl3-+b/oliipj 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 resistanceo1jz yi8162sm9aeoe2 :j nu9z zzki.p, 15.0 W inductive reactance, and 10.0 W capacijo 1z ue8: 29zakiz92nmps zo1ejy.i6tive 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 100xcs.duif ww(u .*imc2/ t y6s(-W resistor, 20-mH coil, and 1.0-mF capacitor are co*t. (c ify6d2msi(u.xc/wsu wnnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coili6 vv4qbf4la6*rf uxq3x6/s l , and 1.0-mF capacitor are connected in qixub4lsv l/q6f6v rxa46* f3series?

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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 itn-9fbix 2c) ts connected in series with a 20-mH inductor, what is the impedan 9nbcxttf 2i)-ce 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.fvxch6 gei c,61)sjas: iwd8 connected in series with a 20-mH inductor, what is the ph hfw66a g1 vsi:i sx8.jed,cc)ase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-m 8(p7bf5o cljsF capacl fp (ojc587bsitor for a 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 rd-qhuo+n)/yi esistor and 15-mH coil to get a total impedance of 110 W at 2000 qi/dh y+-n )uoHz?

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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 for a t76zuazmc6 .so 2u,x odcw)k6uotal impedance of 4awxk6 26 6)7cuz z. suouoc,dm0000 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-hxx aw.9 3n46upqzar4kW resistor at 1.0-MHz for a total ia4uh6 9n wxp.raxz43qmpedance 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 sfxp (-xrd oie+-xdfvw. 9;7i eeries with a 20-mF capacitor. What is the impedancw+i;e.f(fo9xvxr 7d ixdep -- e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series w;20x4o ::ax i xbitrkaith a 10-mF capacitor at 1.0 kHz for a total axxkt:o2ab4 rx:i0 i; impedance 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 *quim9.-5i 6ultf)vo m wxvv0kHz for a phase au- vm06 vvmi q5l)u. *t9oxfiwngle 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 (e+a;fba77w vxe*bl0 zjch9o30-W resistor at 1.0 kHz for a total impedance of 45 9cb*j0;v7a b(7hfeolawe+z x 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 +uc .ci./rbu:5 n1)tvtn oalq a 100-mF capacitor at 120 Hz. What is the phac: tnn/)+ iv oulrb5.a.1 tuqcse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 2: er,,hzqv op)0-mH coil, and 1.0-mF capacitor arrq: veo ,p,)zhe 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 gymzz 7*d:r:q-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 607*zygqd :m zr:-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 ant ez)3ui 6r9gk inductor of inductive reactance 36rk) 9ztu e3gi0 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 angl/7m4 o uum1 jlowgr8+ae for a series RLC circuit containing a 50-W resistor, a 10-mF capj lmg7u+ om/r4woa 1u8acitor, 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 necese-el gw, v:b5dsary in series with a 500-W resistor for a phase angle of g-:bee 5wdvl,$40^{\circ}$ 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. At what frequex2: x9c zlrf xsc8)7chncy should the circuit be driven in order to have maximum power transferred from the drxrf9z7 l8cxc 2:ch )sxiving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 18w4 h;ir a6ld/uvwc r;5.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a a lrwvwu68d;c4r h/;i120-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 y7/+pr ;jy5iahlrrf5j3a fr4 AC circuit 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 has4f 8j.ajr3)qhb) v zar an impedance of 60 W and a resistance of 30 W. What is the)3hvrazqjra .j 4 8fb) 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 chglx j81yovzn ( g/j i+s9e6q,ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecteej/(x86v9 y+o injgshq1g, zld 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 b2-db6.lt8/i idf4 idl qfkq9frequency of a 1.0-mF capacitor and a 15-mH coil in series?6qfb 9bk d4lii-.i2l 8q/ftd d

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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 capacw /isev -qp*a8itor for a resonant frequency ofws/q*-8aei vp 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 inductvebl8s/s//i b or for a resonant frequency of sb/s8 vel/i/ b1000 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 t 8ax4ou 8tjzo8f2js,4ovp p+ in series with a 30-W resistor and a 40-mH coil if the res28jt ,o4uvxojo zt8pp 8f4+s aonant frequency of the circuit is to be 1000 Hz?

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