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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 flunk2-tds ,mnj* to;ftc* qx66uy9pup1x 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 stah)ip1/0 -cm(*jsvxj g .rsxbates 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 ki lfvlti5lg. 3 5f/f2bfnd of change on thf 35vl25/f tllb ffg.ie 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 7nz vekiqwga4qh43n ) m)d)z 9produces what kind of change on th)4n4a3 79q)vdwgh zim)e nkqze 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 produce yo;reiwacmm4ff(25 / s what kind of change on the induced yoe 2 rmf5(c /fam4w;i$emf$, 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 ap: df;h ogyd4) 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 conductor wdwbt62u5me8(ag ,ide. x s*ggill be that which tends to produce which of the following ef2b*mx e 5dw (e .gag86dusitg,fects?

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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 a 6dnoc/b *4tpflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary m/cnt p6*da 4obagnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abozs3nte5 e wt:1u(phx/ve its center with its north pole pointing down, and released. As it approaches the coil, the faluense(t3 zwx p :ht15/ling 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 tok d evr.:7h;+jzjn8 lmo 3 3oaa,lxwu3p in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field vo8jnzx3hm k;:.,ljo3da rwe3ua+ l7fades?

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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 regio01op 6zr,j. c0ilpa9os)oyjbn where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what6oaj0orzo9)p.ij lc ys, 1p0 b 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 top in a region where the magneticci 7d+t ob-9h:rt,sfm field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current inhdc:-os, 97 itrt f+bm 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 +3trtaf i5o vz (3.s 4rpp5hrelies on a horizontal 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 viewed from above, the induced curra5 p+4rp5rtoish ve. fr(3 t3zent 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.srtpbu ;.9 qz with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewedp9.zu.tq; bsr 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 rotate, x(kasb 12w w91zornsd at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wha rbk1snz (s92o,w wax1t 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 constant angular spe o7z86x1 . eoxlki*hpeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of e.7o*x6i8lzx 1hpo ke 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. c mpt.p4: goc(p,r8er
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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 r ,:1d *s+pc,uohlmdl 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 magnetic fi; cx9d)r gzdp(f6q63k2g2tdn8 ef u gpeld. 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 nwxj7yi /jz:wk;hg 9* east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential ind: k9nz/yx7j;gj*whi wuced 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 fw;yp:2ld5:p s5 t xp;yxhjkh p/c(4tconstant 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 transformc1cdkl.tmtvf /1l3 ;7sku5uxs

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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 gz )pjp66oygc1:aa8fx nh4e 15 jjp5xfrequency of the ahjxfz 186oj1y5px gp )g4p caj6e 5:n$emf$ 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 ut1i *);fgfz spsed 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 dev-qrrq ;(t4e9gntw m/rice 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 contains more loops than the primabsri1uu 7 (ygsttj* ;;ry coiugtiy r;b( 1;*tsu 7sjl 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 thes efa unuf*b:.: ,6vy, bxrnl- primary coil contains more loops than the secondary coil ther uy6 b,bu:nxlvs *-, .f:feann it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpome mo7u(/.- bk5ajh b3 1pingut

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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 9h9 l 9k4zqpipv;d;cp circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batlz7cfpm (he/x ) x 2d.r30qyzptery of constant terminal voltage. At the moment contact is made with the battery, the vo(z)0 hxqp3l /dr.px2zm7 fceyltage 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 seriea8w o4w2 mj0s h.s8ijbs to an ideal battery of constant terminal voltage. At the moment contact is made wits4w.o8s h wabim0 j2j8h 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 inc 6tzh)yv+t6vivj0 -vductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and.k ju(1d+d22 edss.c:n hr lrq resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in .fzo hu2 ooz/srjkg /c**0*ib series to a battery. The time constant for the circuit zcuh/roso b2 fok *g*i./j0z*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 connected in series to a battery. The battqtt9 d txz62v0ery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current td q zvxt0296tto 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 sa27j ewd6q 04dc r1vgzaeg,7d vt2dfr7 s(s8iume units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curren323) pvgy 6,nw97wqmhzhvta jt

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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 cxj1eiqa0) 8d yonnected to an AC power supply. In this circuit, the currentd08)i1eyaj xq

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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 factong,w;9ho czttmv/ 2o ,r when the frequency is tripnwc;hzg, ,ot2o/ t9vm led?

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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 bgb -ofi14 o4m)v0o8fmkz4pg voltage across an inductor is doubled, the inductive reactance of 4-1o)zi8 fkpbmo ggvfm4b4o 0 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 g d ( wia)jjmbl*2r-8oan inductor approaches zero, the inductive rlm-wbji g(j2d*)a r 8oeactance 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 u-zc( z/twkw, bus20k4usk6 dconnected to an AC power supply. In this circuit, the curretzzkk- 2s u bc0ks,wu6dw4(/unt

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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 re 1/h/y)2gltz)nilrac circuit changes by what factor when the frequency is trie)y g2r/i/1) llzthnr pled?

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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 approallftd: u z :(n4sitnx 5zm- h*xech4v0g5e-/bches zero, the capacitive reactan zmdn:cst5v-(ln4 4ibu :t5-g*z0/hfx xeh elce 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 voltag.x3::ltnwp)g cxfc* bes of the inductor and capacitor in a pn.)t:x cf:wbcx lg3*RLC 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 q1v8jvxamk 4l 1jcmrk1/d 37o circuit is 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 circuit. The impedance of the circuid o. v7hjo10aaoh+,ku t increases if R increases. When is this statement tr. +ahu1ojd 70h ov,koaue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuel,e 6v az8sr)cr0n l:v3jx+yg2mv( lit. The 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 series circuit. The ixc3 /w+ulvt-oos- jqgt9l)pg 6y. d,ampedance 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, -k(ud09ehc7o5 fkysf)wj 2q jthe cdjff -ksko972h05w q)ey u j(resonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit thatiu h/*(t*cph db 0-ekw 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 occurs when;0bo gv z8t;7x rluy.d

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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 magneticyp1r/7 w7lym*q ezm4(q l hoy6jc4l( y field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne 1wj6 7/l4y4cz myyyp l r(lqmeo*q7(htic 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. 6hfc9u /ucg 1 dlr+vzkiz15j510 m is rotating in a uniform magnetic field of 0.20 T. Find the mk9jrgh1vuzl+ i6cf/c515 z d uagnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniforj9bi0+ru*zvlh 2vks ( m magnetic field of 0.20 T. Fiiz bhls2 kvr90v+j*( und the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redf *5yb/irkq wllx2/(saq:h: mae0 dq/uced 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 e(qp; lmii1p9s43 p: cmp5r r)ts1zwychanges 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 with sides bp(k gctxhmv/c266 4ajm nz26 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fi4k vhmcb p6tmjnz62ax/ (gc62eld 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 with2j 76vgw*-hhh p;0 dqynmfy j1 15 turns 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 andkei.c+vxh1 j/o; ;3;q p5dhvsh.s lio 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 60b .gg5x*;p;gdia7 cqg/jb :bu m flies horizontally at a location where the downward component of the Earth's magngg 5p:xcbq .g ;dub;igbj*a7/ etic 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 consta*(x5nhifl s3i nt angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiefisx 3(5h*ilnld 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 aa*9hw( 6miw ulvj-n) brea 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 o sr;7m1irhv3p nv,rhz; (,fbzf 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 arlo ;(l-z ewf.bmature. 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 -belz.f;(olw 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 of 100 turns of wire of arej p z iyfi+5h004obry* j.,kvza $0.090 \; m^{2}$ 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 with an omz3g)iujd 8nos60 q-iv-s qb5utput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area oz qvdmsu-6igiq 0) o -83ns5bjf 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 genv 8a)rh;aad3p erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on )na.fi 0q ff(anm;+ dm.vq(oj $120 \; V$ 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 8r.v6u izj/uwk:ip b+ a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full u/jik.w +v:ruzp 68ibspeed 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 idfwfz5l* b3x- j)v ho-.nq fqtjg(y,2s connected to a 24-V power supply. The optd)qj.hz lnf-*3b fwq2(ogj 5yx-, vferating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.wnmsu9;f ze7xi:m 0*c The operating current is 1.0 A at full speed. What is thexc9i7u*0:; msnwefm z 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 resis.avxq5z h91tv.-h qb stance 6.0 W is connected to a 24-V power supply. The operating curv q9shv 1.5q-xhz.bta rent 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 transformers12(zcz fi+mjs hk7 9h a-uu4j is 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 transforment0 b g5uqyu*ac. 3-wzr causes 14 A to flow in the secondarbz a w0.yq5nugu-3t* cy. How 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 turns are necessary in a 110-V primary if th wc /-not4bsk1e 24-V secondarycb/w nkt1s-o4 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 coil and a 2000-turn secondar9 u66jtjm .p-tktfhr5 y coil. If the current in the secondary is 3.0 A, what is the currj9 t. mhtjp6fu-r5t6kent 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 transz*-t /n4hg zpnformer. Assuming 100% efficiency, how many amps at 24 V can flow in the second-gzzthn/* 4pn ary?

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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 transf(*rcr;yplb j 1ormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does cy1*pjr;rl( bthe 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 primwn8 i )w nt15hqqd6dv0 ede,9a1av4yvary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what1 t4e)aw0dv68yve ,ihq9 dv qnda1w5n 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 ic5f8p(dnwal5xko( w/ ts primary coil and 300 turns on its secondary coil. If 120 V atk(5fdc8 /po wn5wx(la 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 transforj:cde2pp9nc p(sgu,*o;j . jd mer has 100 turns 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 to bd9d j(*o,;jnp u eg.c pc:ps2je

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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 iefs 1nlu(.u,g7h gq *zts secondary has 200 turns. If the input voltage to the primary is 100 V, wh7u*zelg1s qgnu , f(.e 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 tra72 .7uf j7:-eocbo6mcxvnju ansformer has 100 turns and its secondary has 200 turns. If the power input to the pr 77b2emfxoc:vua 6jo7c .nju-imary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage o- pc-om-ynd :is usually stepped up to 4500 V by a transformer ao-y :n oc-m-dpnd transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuallopyc*.zz1ir/kof 8 +wy stepped up to 4500 V by a transformer and transmitted through a power line of total resistancer1fi.zo/ +*w kyop8cz 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 usually step b: z103rvdwwxi, 9fgzped up to 4500 V by a transformer and transmitted through a pogir31z0:wv w,d z9bxfwer 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 pf d(9tlat2t0 resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tra pl09tt(2 dfatnsmission 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 kca,kb9;1 dt8im1,sflsoh v-x m long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order , f,91vi oakc;xhbms t d8-1slto 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 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 powervlm ubutp1cj ;5j0 o:h1z6u s, would be lost if the power were transmitted at 3000 V ic js1ul,v5obp0 1u;zhut6: mj nstead 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. Itfyr 12q.9yrgu9+jtu 6td ea* o is to be transmitted on a line wir du2e 6.yu*f9ao9qjg t+t1ry th resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 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. Hj0ys.7k4n ikm9l *s tc(5fe bmow much energy is stored in the coil*kb 70ksf.5m94(ntl me i yscj's magnetic field?

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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 co/vy* qnk.4htt ntains a 6.0-W resistor and an 18-H inductor. What is this circuit'sv tt*/qh.k4 yn 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 *e5q oupi oq;j*zv fn:w42v/lin 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 placed into a 120-V AC outlet.rz:167 l-, 1j fabw(puljwwde 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 of the lm)3kqo k6ls u +q7+x)2zxiaraamp?7auo3i)6)2zqmqsr l x xk++ak

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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-Va2:,w+crdw jdfjz(4p njsd) 3 ac power supply. What is the peak current through the resistorrddw2:4)(jn , jw +zd3sjp fca?

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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 the pci1o8x/4+jm 2cdq gqpower dissipag/cpiqjxocmq1+82 d4ted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rn/yy 8; d5camm4w njq:esistor 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 rccskz8y y12mb78tl 32 ibjwy4esistor 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-g-tl9n6:c uj wW 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 induct;hetu . f)hrhw7p, dl3or 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-mHpgu 6 yr1t,tsb9xtz4z * /5moronr+x8 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-mH coil have 14.0 W of inductive rj hu0v5mn xl,zm0 8ng)eactance?

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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 inductigf:gn+-s ,aij ve 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 a 60-mH inductor when 120 V AC at a fre :ue3d7/m6yjtewy,i cquency of 20 kHz is ap67 ,dmecjiu/etw :y 3yplied 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, )kz qz8x.hf;n +8ausd 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 capacitoys(o 9:5k-p7y n ddkbzy-z8w yr 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(n6 b40ne jw9galozd0mv6;ik 4mvgq0 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor hx g,y2 nqcm6;2 jp/ypfave 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;l ,get0 * 3v .uripikmymyov i5an+1,.010-mF capacitor be 100 W?lmo1.ern5,i,kg3*u tmyi +y0v;iv a p

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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 throufd0qh,adt 5(c gr j65rgh 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 g6t 0gr/ t/be:sdcr:snd)p s5of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitsp)n/tdg t /50c::g ds6serbr ive 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 resistorw . wz31atgg;/ yewc0l, 20-mH coil, and 1.0-mywlw3; wa01g gct/. zeF capacitor 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 ang1( f3tgw iut: .ixx5w jnpo69fle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connew.ntg3o:j( w x5tu i9f f1ip6xcted 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 connecte5kuy2y: bvz5*s j0xzyhrj re+jh ec60- a,7wld in series with a 20-mH inductor, what is the impezb5 hyv j -7r:2 cysa, u6*rhj0e+ezljk0wx5ydance 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 inductorp-,qi vcnb/ h3, what is the p, i/qcn-bpv3 hhase 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 h *wpyu l3xut.1-kd9pcircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at ptd9 x kh13ply *-w.uu1500 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 cap *:: ;g .ssor1zya6oe9smk (npxbvo/gacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 x*k6(/m1go.ea psv ; 9n: osbygrzo:s Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a v/ 2.rfpdoic lcj.3c 1total impedance of v.pdcc/ lfc i2o .jr3140000 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 wit4* ix gh53 zpdal3v+9pyu+dq nh a 100-kW resistor at 1.0-MHz for a toh43 5+d q3zvpng plyi*9x+d uatal impedance 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. Whaxf p2;+sb;6r7 bw3y axhrvwd+t is the impedance at 1000rb2fwb+7 vs xp+;yxhdr3w ;a6 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 d6k gg8w)vv2.l 1kfmt 10-mF capacitor at 1.0 kHz for a total impedancv.6tmvw8kfgld2k g1)e 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 wt js3ht(j .;q-zkc(h a 10-mF capacitor at 1.0 kHz for a phase a.h3w-( skt;t jjcq(hzngle 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 resisp8dp-pbi z.d0l ghw4 5tor at 1.0 kHz for a total impedancpd0d -8pg5h pibz4.lw e 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 capacitor at 120 Hz. Wha ml+0zjkuw84yt is the phase anj +k8 ulmz04wygle?

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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 resis jz :t,u0w7iqehqev4 (tor, 20-mH coil, and 1.0-mF capacitor azehtvie, ju70(q4 :wqre 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 b,tqjla0 i 8wsqud 114of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60 8qwilj,t0bs 11uq a4d-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 inducdybztzqk g6y6pzy m);p6.:)d tor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current f6kdym6y6:zq b ;)ypz p )t.zdglows 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 containing a 50-W resisto7l-zz8qs/) qz xdawyd; mmb1.s7h up ,r, a 10-mF capacitor, and a 0.45-H induca.7zsyh/dqsz m;pl8 u7 x ) m-d,wz1bqtor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a, gec.z mc.gn,.q 9sbp phase angle ofn b .c. pmz,gqec.g,s9 $40^{\circ}$ 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 havd-+ x.ozi 72 y2fh2z2cuwjt ns R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from idh2zo2xzt -c2w .+jf7 yuvn 2the 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 r c5tok8,wy1x6uy r1g series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is c61gokr5y8xy rtc1 u ,wonnected 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 A01;vltk*9 o t rj)eiajC 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 has an impedance of 60qpp 5o2n2dp) x W and a resistance of 30 W. What is the popqpd) np5o22 xwer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contbm smin6qf)z*-rg2 1 5o+trlnaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected iozg5)*ftnnsmr-+q 6 b 1r2 lmto 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 capaci tscfg o+29p.kpbri2v2m (a: vbdi1;itor and a 15-mH coil in series?vrbk g(2at .p2cpo9s i:vi i+b2; 1mfd

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nee l(*w*er cx1qszta7i+ded in series with a 4.7-mF capacitor for a resonant frequency of 10 kHilc*+ezr s (a7w1x*t qz?

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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 for a-ncv gh *c,zi8 resonant frequencyzc *-vhg ,cni8 of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-90g 7ye4 ld;rb/ mbewrmH coil if the resonant frequency of the circuit is ;ge7w ybl0rm4 edr/b9to be 1000 Hz?

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