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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exc/f ui(zw9 do-jept

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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 the he)x-(d9 i rfq$emf$ 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 3u j;).v* wz; yl js0:ncveb wriig0)zof wire in a coil produces what kind of change on th ; ;r)j )g0uv.z0ezil3jw:winy*bsc ve induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire . e;r gpuo59qpproduces what kind ;p.goeq u 5rp9of 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 produ1ykk5 o -vei)uces what kind of change on the induced kov)yk1e-ui 5$emf$, 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 magneti mzf cu8,(pxg/krm*.7ic 7m33xoqpxs c 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, th:gv9v/armwt1y3ez;u bwr(h l e45b n6 e direction of an induced current in a conductor will be that which tends to produce e g6m:e(h;3rw tlv1 594burvn yz awb/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 ba* s,2pu pi4qiar magnet is held above its center with its north pole pointing down. The stationary isipq, 42up*amagnet 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 7w6 zuwg+i3q,/ zyglw table. A bar magnet is held above its center with its north pole pointing down, an3glw ugq7 ywiz /zw6,+d 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 6 l*0gb bri;kakt2gi) a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what isk)gr a;2ibgb *k0itl 6 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 in a region where the magnetic field vect0q u 68g1 o9wtpz lnea;+frcy5or points straight up. The magnetic field suddenly grows stronger. When viewed from abovea9 t1ul c gn yp6rqzf80;owe+5, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table t-0 b wrla+n8km:* zeyvop in a region where the magnetic field points straight down. The magnetic field disappears suwv *knm l0e: +8az-yrbddenly. 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 horizontal table and carries an ever-increasinggdjs6ayw1 5(3q 1smsk1icxh) current noh5c s11 jky gsiwd3x( )sm6qa1rthward. Two coils of 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 of wire ph ap+2og4yj(:1fysvk*h ;ie with the north pole entering first. As the north pole en(;a e*g:p1hyiy+o vj4 kph2 sfters 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 gd n t ddxekp*cg;)gg4-0g//e about an axis whose direction can be varied. In a region where a uniforp4 -)0xdgeek/ggd / gn;gcd*tm magnetic field points 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 rfx ,zcb wv:9m7otated at constant angular speed about an axis whose direction can be varied. In a region where a uv z:fx9cm,bw7 niform 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./t yko3w9dk t8
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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 b:at7nf.3 .oqo:6b djvr x :ogthat 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 magm4bud+q gssmm6 dd4,;ly mb; 1netic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mg)byn21c mmb (oved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across t cbngm2b)ym (1he 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 constpi7fd 35aw v47-nfvq lant 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 transformsg bil-d,uaxi- ; mnk9k8(-/ t3a ejxeq

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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 fre(byxe-gc:)0radl -av jjd n ,2quency of t- :)jygj c-evd,a2d rlx0b(n ahe $emf$ 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 dv 9t2-mgdwb9 jevice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thatl:x 4ljd- xr9r;lec 1r

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prikp,rj n)a ;adn2osf/ -q /fuw;mary coil the;a j; spkuw/f/2d )rfon an-,qn 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 t 0wyc82gk 6sbehe secondary coil tcsywb860 kge2 hen 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 powc/f)94 t qep6xubn9eker 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 cir 42 (ydsohusd7 sk,q;gqaj; f;cuit,

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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 connected in series to an ideadnq+z ,5eqpp3dvke+*0g c -kbl battery of constant terminal voltage. At the moment contact is made with the battery, the volt+kd-v cep+peq 3* 0gzdq, 5nbkage 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 ifcs 45 hlu2z6j(ynx:ro1l r1 to an ideal battery of constant teu2rh151lljcs r : o4(zxiyn6frminal 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 resis ge-u2xz;5 spv0dxt/g tance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with ind.9+.fvy;6 ded sitgcp,o5 ,j+wl el acuctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connec.nb7f ui)c:ur ted in series to a battery. The time constant foubnu7f)i:r c. r the 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 connendy6dem c3p( 2ixvd *02bq d.gcted in series to a battery. The battery is *2d g 0nxp qdi.cm2ydve(d6b3 suddenly removed 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 ujv3 4cbeqc2 a4nits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an juti- ow rf7)zd1gi*5 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 supply. In this zv5 q q/c6b7*k+kiwygcircuit, the current5wk7y vk ibczqg+*6 q/

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the:c0vf+-xtk0 )- i jimbbyi 6jl frequency is tr0x iibk-vc)+0t6yb :ijmj- lfipled?

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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 vol2mee3d3fa1dd r l2f6 etage across an inductor is doubled, the inductive reactance e3 2r2 ef3dfaedm ld61of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across kskqg5xxtkb7x( 4t(*f( n9ik an inductor approaches zero, the inductive reactance of that7x(xxkkgn( 5(qi4bk t9 s*fkt 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 Ao.m.jk1s kde qzjxcj/(tp,98C power supply. In this circuit, the currenz ,cd(. 1mtj.kjjk x8so e/pq9t

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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 s.eo u 4ehbs1/w :jbau55et t:circuit changes by what factor when the frequen ae:e1 .uu bj /5wssb5o:eh4ttcy 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 approaches zero, the capn-4h8mwkl8a :u nvq;nacitive reactance 8nu ;wqanln :m4v-k8h of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductoczeimmr 1k e+3 lm*nnur16k 4(r and capacitor in a RLCm uin r+r 3kml*mnz16(1e ekc4 series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined dmm (5oqb8)c nw -5nrqas $\cos M = R/Z$, 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 circui d2y.6 v)6.7fy;yn uewqarrhrt increases if R increases. vr 6q.y7)y6uawe2 h.rrd n;yf When 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 imk4q4ij3 tgpm sl24u1 wx:zsi)pedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedanviq22hs elec--ayz3) ce 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 an b9xk:46kwfiu-qoi - rd the capacitance both double in an LRC series circuit, the resonant frequency of that r ix ukwf-46b:oiq-k9circuit 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 thf zq5 xk ;.6c1bhzg s2*+cpjnkat 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 series RLC circuit occurixk+peiegu.mrl7*c: s:f0( +hhnm4c s when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 9il4dyx5tw( 3al gl)sq k ,xe:0.20 T. Find the magnetic flux through the loop when e) ll5xydlt3g,4ks:9 q(wa ix 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(1g8vt zve.2ir4msco/3kbzko igb0s ue2n.2 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 a0v. e2bi841k2zt.regzs ug bos2io3k /n( cvmnd the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform ma. nd7mjahdmzq negg-p 7+,6r(gnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fejq,amhn7 g7z+(-pr mn d6.dg ield 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 l kmvs0hlo ,f .1w2jyp)oop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes j:2bl /xg hury; 0.bvyah/(lpfrom $4.0 \times 10^{-5} \; Wb$ 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 x j,.t2 ixin2xa square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the i. 2xinjx,i t2xnduced $emf$.

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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 tur: d svvw5./t b0mznwrf7a7hg-ns 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 at.( af -rnsl+1cf dj;vtq0yb*nd 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 horizontally at a locgon ( 3m)zm8 mvna,7laation where the downward componenvl ) 387,(azmnag mmnot 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 m long rotates at a constant angular fl+wpei(i18vqzts3uv; y q87movr)- velocity of 2lvsemt + pi3 (1 yzv8iu7)vfwo8-qrq;.0 rad/s about a 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 generator has 50 loops and a cross-sectionax52)1ys))hn x:wlslqcc s ezpb +45dql 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 turnd9u7r vjp kc b*.qc*d(s 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 rectano)sx6c g8/*vq 4wobvjgular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T,xc) ow v 4gjq/b*s6o8v 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 of 100 turns of wire ofs+ n uhx.uv+6e 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 s 3xvhgf 0j i:hc:f2g:to construct a simple AC generator with an output of 12 V maximum whv j:fgg2fhs3 :xh c:0ien 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 generator with a maximum3ne xr4aqf)*s $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motork7dc /+tbf7s1 x8pzoo 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 resistance1 1u9o yv,fmxwx p7sb7 of 6.00 W. The motor operates on 120 V AC, and xs9muf,1y1 bp w7xv o7when 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 interna.ewzv5b9egwozm k, 4 ,/ )k.xdtph: qil resistance 6.0 W is connected to a 24-V power supply. The operating e./.m)hk,iz4x, qwdk gewt:9 5bzop vcurrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V ai:qe9ep; mb,i g h+2rpower supply. The operating current is 1.0 A at full spabep ihi+egqr9m;2, :eed. 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 resistance 6.0 W is connected to a 24-V powr j-(ylved*v0jrku/( g:k4q i er supply. The operating current is 1.0 A at full sp 0lk(y rjv/k* je i4vqd-:(ugreed. 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 if6py 46vkva )7 adw5ijs needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seb jfs2**xxng )condary. How many turns are in thn*bsj g*x2f)x e 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 nece z 0xr.7 eq+gk(pqt 4fhpw:j7/ slx(bwssary in a 110-V primary if the 24-V secondary hp4(0plqj( xsf kwg. wxz+e q:bht 77/ras 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000qxeyd*n 7hk x3+z6t fw1p21px-turn secondary coil. If the current in the secondary is xz1ep1xq27k +ydw*xfnph3t 6 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Ae djn0hi-7qyqo dh4 ),ssuming 100% efficiency, how many amps at 24 V can flow in th) qdn, qjh47d0ioeyh -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 sign transformer provides 7500 V at 10.0 mA.tqo:-qcla;m8 p,/bwo The primary coil operates on 120 V. What does the primary dra/coq; a -l8toqm,w pb:w?

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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 seny: hujcyl ,7,condary coil. If 120 V at 2.0 A is applied to the primary, what voltage ic uh:y, yjn,7ls 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 on iturdzdaixj)19s kt 4,m+- w,px s secondary coil. If 120 V at 2.0 A is applied to the primi4,w-ujk , sx9+td dmrpz ax1)ary, 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 s2isj126tnvpvom6j kgt , pd(0 econdary has 200 turns. If the mo( vpp 1v2 60jnjgi d2tkt6,sinput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer harci4tll1.5/:/ki whw vgj0 kt s 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect w4ihkvjr/:i1wll 5 .ck/0tgt 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 transfos6 fzl qvc/1z,rmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpu6c/vz,z sql1f t of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current * ahw(if*i4pmat 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 numbe mfwp 4(ii*h*ar of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually qe4- p,(,wvn bharbx;tgzr* d9 )lm;v 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 the p za*,g,lqh4wbebdv v;xtr9( m;)nr-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 voltagkicj6a8qzi2cgj1/2 ce is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fgaq6jzji2/ikcc c 2 18ind 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 res2 fyp:/iqv53,tpp nsc,n 5c kwistance 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 of 100:1. What percentage of the originapsw nft ipnc5v3,/kp52cy q :,l 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 v,ny);hhzm5u - z 7ik, sxh2jpline 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 voltage is stepped up with a transformer with a turns r7xuphn-yv2)iz ,k,;5 hj mzhsatio 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 lf n8afln9n86fg0 cdl;ine at 1000 V. How much less power would be lost if the power were transmitted 88lcn90gfnl n;6ff adat 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 20t jwtk;l mxy :)ih)+ iro8a5x( A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a trj tw+a;t)y x 8o(:l i5xir)khmansformer 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 much energy is stored in the cojfy28vkz1n 9oil's magnetic fielf 1 nkjzo29vy8d?

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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. Whc57+jhtjg/ r8zok rl4at is this circuit's tim7t4 oz+5jlcgr jrkh8/e 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 volmpm:j sp+;rw fbuy4ch((e 6) ftage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placeqsj sw i89b/y txk84y:d into a 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 A 1dd bv+*e*dtaC outlet. What is the resistance of the lampbd e1 dav*+td*?

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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(wimka33 c8c/y0 wlg/vc/kw fr supply. What is the peak current through thewm/lk8wk/03 cwc (i/yfv3agc 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 tntsdhewxu8); upfr 8pwm j*. 6/aq k5*he power dissipated rhp*f8w axq.)ju5 6/k*mnwd tp us;e8in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor g*f(li yq8,ux ;)nwlz is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistori08(z-/:ow 6nqu-fbb crtyl z 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 i :;fystq w.;uws $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 H 6osa2,:xgqzw -k ybe,z?

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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 ao if .6-wpwej7 fg2,l;.o ciig 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 14.0-ob)xx2s1nx/t(i ee0 a y5p3cvbu db(/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 necessarbs) y. q*ghgk:xct2 9my for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a4 ltkdmn4nylbs45 .d 3 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied b4 k.dmdn 5sy4ln4 tl3to 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 2.50af6s v7win+4 l9m d1*7 ee4g v9fjavxf-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7o0)-jvylpqob ym ,*6u-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capac ww gej., 5yk2wifnp0 :63f;ve+iceu gitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF ce1 g)lmema/ta lm ;;7g ofvx;+apacitor 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.n7v7qgzqq*//g)tzsraujdntc b i q : 2(g,6 3e010-mF capacitor be 100 W?/dj ,n6/ qt2r*quqg zeqb( i77gcg:vsz)t3n a

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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 throu3g/lr w+q/ sebgh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circui:z)pxg u i7wb,t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive )pg,z:iux7b w 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 i u9h4eyq l)k6 khkf9xi ,if0h;f a 100-W resistor, 20-mH coil, and 1.0-mF capacitu h l499,)0xfk k;y hqiihfek6or 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 100-W r a cyez,h1jpap 8y7 l.(: b0dvv:,wvauesistor, 20-mH coil, and 1.0-mF capacitor are connected in zvy0a,j:u. wy1e:va, v7p hca b(8lpdseries?

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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 witxn2p fnnut36:h a 20-mH inductor, what is the impedancpu :xnn 3t6fn2e at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the 9,u; jyjo9cwf 1h( 0k;jcaepupha 0hf9,uayck9 j ow;; eu(1cpjjse 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 p ;m922f 4ot kjlqud5za series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedan5942zu okdtmfjpq 2l ;ce 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 i(( ,yhbcqyto -s needed in series with a 100-W resistor and 15-mH coil to get a total impedance of h-yqc, b(y(ot 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a q u /qn3ggy*(xzx k) 16e i0sr8xw8ilm450-mH inductor at 5000 Hz for a total impedanqe8w /xr6 yk*x liq81un)s3 g0xm(gzi ce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW r5wf1je 5uedv(v-xx2t8e( njt esistor at 1.0-MHz for a total imej(x5v8x 5wj2uv tet n fe-d(1pedance 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 imt/ m;w cek6 (b3nlrc+6v uvwq6pedance at 1cw6 m;3+be 6uk cn 6/qlv(rwvt000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacid 6b;*pw( esgvzf l,)utor at 1.0 kHz for a total impedance l;vg,6 )e(fb*zdups w of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a ph 06-l,pmjs-4u k-hrhbh/ w7gwkpvq 6mase kqg lh64 -s 7,rwmmh0wp/-v-ujk h6bpangle 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 j(t o6 ha1fsw-in series with a 30-W resistor at 1.0 kHz for a total(1-f6 oajwth s impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF i;ckj+3f9i:c9yuu pg capacitor at 120 Hz. What is the phase anglp;+k99 jucu3fiiy:gce?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, andk eohd(t7.)tdg la8 j26)v knc 1.0-mF capacitor 62gt.(vo laentkkdc8 )7)djhare 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 az+)6zhfn, 4fpbw( krog-wjr) 100-W resistor, a 10.0-mF capacitor, and a 0.3+wfj(bz4 r)pn wo-zfh6), kgr50-H inductor. 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 indu6q*dgtpqaozkfq ;0 xdg r9/eu0 -e) z7ctor of inductive reactance 30 W07 ;gq0*xo duep9arq-q )dgk6/ftez z 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 angle for a series RLC circuit contab1,gqzh s2 m3pining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6p3sqbgh,1 mz20-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 resistot9- dyf7qunpsn 4cipy 7. -zh)r for a phase angle of 97nsn7d -4)fq-.yiz hup t ypc$40^{\circ}$ 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 freoj6r,ee/ ye 8wquency should the circuit be driven in order to have maximum power transferred from the driving source?jye /6oew,8re

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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, 15.0 W f)7hg m3i;epcj -e;gk:vbkv snk417r inductive reactance, and 10.0 W capacitive re e4:cm1 j-7v3vikfegg;b kr)knh p;7sactance, 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 cirn87ra)ynwhw l t:- j:wcuit 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 resxb)b 2yf*o qy /g(u*yristance of 30 W. What is the power fa(2ry*fguoxqb y y* /b)ctor?

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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 RLr-pm m6:v6d tlC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,lt-6 r:m d6pvm 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-mF5 sq3m(,quus vox-px0 t( vbh1 capacitor and a 15-mH coil in series?u5sxb x0 v ov-uq 1((,pm3thsq

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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 wit* u;pu-dgt+( f/gqymi h a 4.7-mF capacitor for a resonant frequ /y* pfg +g;(u-dumtqiency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with s2q/cj4z,ca iu8)h15 ojm hpna 3.7-mH inductor for a resonant frequency of 15)sh1az/m2jq , cnhj4oc u 8pi000 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 -fxkg1;i llsxq2 o0;3uv 20 nnw6rxzzmust be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to o20xr xs-;6;nw2zfnlkzql i 0 vg3 u1xbe 1000 Hz?

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