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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 flux exceptb l get;y.-be+

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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 th-e. fsc-3cq8/ wfez3f ig4ol fe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chang1mp86r7okqgt e on the induce1qoprtmk 687gd $emf$, 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 throughsk.9xj /alqhq(ki v8 v6m8)w n a loop of wire produces what kind of change on 8jqhamqxik/ (6lsn9) v.8wk v 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 wirevztugrkwo1 01; q8 zmo34 /wps produces what kind of change on the induced wzs k vogu3pwzmr401;q81 to/$emf$, 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 magnetic field ang hqvvn, uo2w/y9wa9 - $emf$ 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 wiya7.9(.zl mm5 7r+ndo nwlvkell b+nom.9 lwym dvraek77nz .5(le that 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 horizos gy;vhz. 15sbn zol9ru5y ;x9ntal table. A bar magnet is held above its center with its north pole pointing down. Tgx s;9l 9v rn 5y.szohy5;zub1he stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. 676hdjv/ *ay dv qs1mjA bar magnet is held above its center *yd6s 6dhvm7jv/ aq j1with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where tx:;zky7j/. u+qgx 6z*2izysztzn r8rhe magnetic field vector points straight up. Thg8; ry/ rz27+tzq6 *n zx syzx:ijzu.ke 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 u(njhdi*l36usg )3kk top in 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 the induced current in this coidj6u(ugi sknlh* )3k 3l 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 mauq*8. ye)g/y ewa1(kkhkm1ma gnetic field points straight down. The magnetic field dism8ke*yy au 1m e)(w 1khqga/.kappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-i*1 ss ,)nwzaw0ycx5kdncreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from anky,)0 5wx1wzd cs*s 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 lt* ebrdp) 6 jmx3id4d8oop of wire with the north pole entering first. As the north pole enters the wire, the induced current wt jrdd36pdix be4m)8* ill 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 cons.hv jt(ruprn2o4u 3x0 tyy88stant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of04u3tnp.2yoysvrrju( t8h x8 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 constantwxv2g+ hs,.k n 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 ornw2hv.kxsg ,+ ientation 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.m6m0xw* 5ia5kwpffa* aq9h 4v
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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 th :hb-6bak0 vabja 36ygat 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 ma.5z a*a omhx2n05alvdqy 9bg8gnetic 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 xud-f bhs t9ldg x s)w7s),2p2moved northward at constant velocity through a magnetic field that points straigs)df2-wd29 xgss7lu,x tbh)p ht 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 con; h)h8 vexywe)-gu, nvstant 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 transfel7rt e; l;,aforms

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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 60amel:8l4r 4r ld ldq:9zcu/v 6 revolutions each second. The frequency of the /9a:8uev6d4ll l crrz d:4mlq$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tokjx --ib 1a2f2oh0vto

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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 thato*weop k0;s(g

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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 sec/rb nat r3z00vtwk5l4ondary coil contains more loops than the primary coil then in4k3b0z/vlr5attrw0 t 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 pri ojn-.)d0 s0c(ohq(f qi:o xvkmary coil contains more loops than the secondary coil then it .q kxvsd ():(-0iofco n0qjohis 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, th5do *osgjm i(o2p;n) ge power 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 circuki-j 6j wjox()it,

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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 zb:oib( dtm0 g146 dfgto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltamfdbt4(di bz:0gg 1o 6ge 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 f)+iibhnel8 f 1p sre *-ciz2+series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, t2r sl z+)1pe8 febch-n*iii+ fhe 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 0wgf dw222.g vpie2xeR 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 resistanceq d0 ro4b*-aww-/nmve 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 i,/3aqf f9fre9f -1ryked0e lhn series to a battery. The time constant for the circur-f913/a0fyeff ,h edeqr k9lit 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 battim1i fdos41i a6vsifh g/ g651ery is suddenly removed from the circuit. The time constantg6v5m1i1ido gh1iia 4f / ss6f 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 samu+xswy n+7b hh; y)nhxdrp*4lv(w+p2e 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 po7szt u(im. rq;3 tcsb5bke 60pwer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, thes5giwvo*g;8ypzex )egy .v,6 currentvopgwxyz.;e vg* yg, si8e)56

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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 ldi.)yqfy )y) o c9d)pwhat factor when the frequency is trf )o dpcylyd ))).9yiqipled?

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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 voltage across an ib cxn (/wj6 ,1vvl3 w4g gwiwsig5k8h98f dfj(nductor is doubled, the inductive reactance of that inductorwgxhbkjn cvlw,9 s1( 8jg6 f(wfd5 i8vwgi43/

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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 voltageo u/:uapr ;g-u across an inductor approaches zero, the inductive reactance of that coiu; u /rp:-aguol

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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 gz0g. lddv:x- AC power supply. In this circuit, the curren.-l zgxvd:0 dgt

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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 acn)a5 d)apaf2k circuit changes by what factor when the frequency is))5n2d kapafa 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 c;.u ) vr(c5k b,omqqxrapacitive reacta v)bu 5; ,(rcoqqxk.mrnce 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 induc8 d 759u,p qfuf7dbhmtv 3oce*tor and capacitor in a RLC series circuit97uf7 p,hcvd f boqu m3e*5td8?

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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 cirkpfvnxb:s e7+* p .h; ag-va,ucuit 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 impet;zx04)z;xj k7 edutgdance of the circuit increases if R increases. When is this statement 0d 4xjg7kz uetz )tx;;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 im4 jl atfjj0)1bqs8mh/ 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 impedance of the circuit increases i bz2v:f;9w8vvsqx1*0 at ypbff $X_C$ 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 capacitana1 : azzoztq / h-ni;0fpmio4p9.b1fjce both double in an LRC series circuit, the resonant frequencyzz14ahb.9q0- ; i tmnpzf o:jpao/ fi1 of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonan6 8w(gc,r hzzbei ea2o0 t x-7zbvk5a7 y*wi6ece,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a seriesea0l .h 22y3vkt ,qcx a9hqja- +s3:oanvtz2v 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 radi6swq,6v9j4aq(ewu pchcn /y 3us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane o,4(cep u6/hqvnc6 waqs9yj3w f 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 rotating in a uniform magnetic f rr )-2y0j8ky- hq;*a8jkflchc y nw7dield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fid ak)-8ykcrcq7 y;h -jhf8y20r *wjln eld 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 0.104e tpm vpf9()a.qmw3s l ()zhp whh/h9 m is rotating in a uniform magnetic field of 0.20 T. Find the mqhfse/w. mhh(9)h mplat9pz4() 3vwp agnetic 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 adjusta / 5 mqkkcsw/q45t,gqpble single loop 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 frdnty41vy -v94pr* a)u6lho(x1lq xqaom $4.0 \times 10^{-5} \; Wb$ 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 squayk772wy fvr x +g5;oikre frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane oorxv+ky ;7g57ywk2fif 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 m6 3nj3n5ad yyof $0.40 \; m^{2}$ 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 a8fp3f1k//i2m whrudj 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 spaue 5yq 96/. 1yt j3jamgn9aiptn of 60 m flies horizontally at a location where the downward component of tnj e.gp 1utay6jqy9 t953im a/he 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 cons/i gh ovzfi -k1zl+q07e9q0hctant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a coz10gi zh/ce -f +qo0kihqv97lnstant 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 cra:iq 0 ne0wfwul30dr-oss-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 8/: .+xwu.gje ks8ynhw y6lrr 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 l.r9ou+c d iknjv.8 ;gnoops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis9 8gukoj;nc+ri .dv.n 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 of bd1v yp-(g2 t5 ssj4uq100 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 eo8b+(24 be9,m .6anyk kf5dei z imytsimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the az 4mfeyeab nm59bd.k6o(28y,eitk+i rea 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 generawu + :e08lijm a-vso)ntor 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:rb s:xfjp6 w( 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 6.0s626 swfakc(d80fs vi0 W. The motor operates on 120 V AC, and w (v8c0ds kswi26f af6shen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is zn e c5a(jq)6rconnected to a 24-V power supply. The operating current is 15)(eancj qzr6.0 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 rkpo, ;+sfo.4vslcn1tesistance 6.0 W is connected to a 24-V power supply. The operating currloton v s+41,skfp;c .ent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resista r/9,u6qi 21dcef mmnss*/mbknce 6.0 W is connected to a 24-V power supply. The operating current /bf6is,sqcemr n/ *2 m91m ukdis 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primar nmbjh0o8;y;1le:+i s d: gvhiy 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 traniip0 l3t wn29 q:muwy.sformer causes 14 A to flow in the secondary. How many turns are in tmtyq0:nw i l3.iwp29 uhe 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.0zz gdfu+70d7vsfd xssary in a 110-V primary if the 24-V seg+dsz. d u 077dfvzxf0condary 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 c- o4nuwrzpuswi/ m/7pb.+ ,t primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in+b4nou /.u7s -ic,pzpmw t /wr 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 prkh; jhvwnh.:1imary of a transformer. Assuming 100% efficiency, how many ampnkv h.w; j1:hhs 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 yok02f :m(yavneon sign transformer provides 7500 V at 10.0 mA. The primary coify0k( amy o:v2l operates on 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 +e vgud(0lkslqo.c;4 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present inlv u(s;oeg0d. cq kl+4 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 t50ca:o7yox i its secondary coil. If 10octx5yi:o7 a20 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer hnxs80 crpqr+ 2.v lwq9as 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output r v+2qn rws q.l08xpc9current 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 transforms3amw9 ( ddze4er has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can 4azdswe 39dm (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 secondar7me x* v:/xh;txphmn ;g2lmh;hyo8e( y has 200 turns. If the power input to the primary is 100 W, weh em(ymgmehn* lv p: x/7;xt;oh82hx; 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 kro.+l .l4x gk60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through rkl og+l.xk.4a 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 usually steppet-5wn1q bw2gi i8or n,d up to 4500 V by5bt 1-w8wn ,og2qriin a transformer and transmitted 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 usualls v1b w(3l7 zub a 7bv39.*d-y-vygj5nhwai giy 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 transmission line if the voltage is n7nsz7ivu* ilagvy wa5w3j bgv bb 9-3h-(.d1 yot stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W.t1s3l fc); 7vq(yh vy l,.adnl A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer wn)dl7 , l1(vtch.lv;y3yasq fere 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 gc;t 4v nf.frgy v/v z7qqg7m8()b t6sof 0.60 W. A generator producesvcgtr;zg /(6v.gqq4f78 )nvtym bfs7 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost 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 6c p(6+lskjo :q.3bf b.bpbu 2 jgqe*ywould be lost if the power were tra+bu q.c.fy o3 lsb*pbjkjq p2(g66b:ensmitted 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 transfkyc 8:*bv7jzvh,4 itmitted on a line with resistance of:hz j t7k,4c 8v*bvify 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 x:a0wwq ,+eihtt(ab,.0 A. How much energy is stored in the coil'+q( b w0:itha, a,xtews 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 contains a 6.0-W resistor and an 18o n6/1qn,h12eubfs5r 3 gdj ha-H inductor. What is this circuit's tiobn/a6nsf 52eh31udh,1g j qr me constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms v6s7 6pekeq uh5p-4hm poltage 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 curyl ( ml//nmd5rix hai2i+- p+ra) c8virent?

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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. Wh w* ewyf2x8.scat is the resistance of the lafy28s* wwe. xcmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak curree/a,ue*rf, m ebgxw)4 (0qqignt through ,e4b )gi ,ur*w0f/m q (xegqaethe 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 the power s 7et(hj- n:vudissipated in the(:jth -uevn 7s 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 resistlnmnuc s4o.l9 vcb)((or 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-Wd6,q2tts y z1ygrktco* 8jwx:x4v; u: 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 resmq37p x u .mxhun0q7, */nxkptistor 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 inductor at 3fdv)b(kb-k 1/i d 9hy-qjr zyb3q)ei60 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 100/ev3vcu8n:f)xupowjc) (: /oy8 nl n mbrb q5/0 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 eavz8 v0yim;.have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductx.-c *xhqi kuu67u, maive 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 frequencyt9 (b jbdhpyy85i zg+; of 20 kHz isp+y; y i8hbzdgb5(9jt 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-mH coil due to a 110-V, 60.ff cy1j(nej y 5.:qmj)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 o2up, fpuma;y: f a 4.7-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 havyt3v 08acaccx 22ltz.:,aa tu e 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 have a reacta7m0f nifax6 pic6i:xb mom: 9)nce 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 capacitohp5 6qe q/nquhl rfa()1:5lj ;ua* lhkr be 100 W?hlqfj61p*5 q /hun kl)ahe ql:;ua r5(

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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 cap20zg3m 0zm9,19 vw nbkini q0agl4sct acitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with0u 4vxobx*dk+nl:e ; 7w0xbeq 12.0 W resistance, 15.0 W inductive reac* x:4ev owdunl 0ex bx;0q7k+btance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W rr6olb 1s(gx4 s( r+m4zusogw:esistor, 20-mH coil, and 1.0-mF capacitor are connectms:44wu gsog rx6r+ lsbo(z( 1ed 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 ajt /d ity)n-o96 (kpqt 100-W resistor, 20-mH coil, and 1.0-mF capacitor are con6 j)d-pokt(ity/ qnt 9nected 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 coe zc6a* (xkzk)nnected in series with a 20-mH inductor, what is the impedanca(6k* ekzxc )ze 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;1uqa l5x40vdfflc :s inductor, what is the phasl0luaf q4:f; dcsvx51e 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-mF capmz9kr;f2 d2fr acitor for a total impedance of 10kr;fz 2r2 fd9m0 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 3a+xbyjl( x.5iufb -l capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total x3b.bj l5yf (i+ux-al impedance of 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 450-mH inductor at e1n6wtvws1r9q6uv 33r cb y,d5000 Hz for a total impedad3s u6qbvetv1c3r6w ny,r 19wnce 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 0u+ppzg q2d4o series with a 100-kW resistor at 1.0-MHz for a total impegzou0ppd2 4 q+dance 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 .l+h h9 (tmscee:,ynnimpedancesn:my+,ec 9ethh .( ln 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 with a 10-mF capac2sjpea11 fa, :5j jqyhitor at 1.0 kHz for a total impedanc,ph1q 52ja:jfse1yj ae 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 capacitokh6 4vasqs 8b+r at 1.0 kHz for a phase angle 8svkq 4ah+sb 6of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.kd4 pyio8pa+ggy h89 10 kHz for a total 4 yg8oyg91 aph8dip+ kimpedance 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 inh e8u3cjluf;6 series with a 100-mF capacitor at 120 Hz. What is the phase angl;uu36hejflc 8 e?

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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 j bmt6-;bb-1khoh t5gV and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteg hbkhbbo-5t; 1 6-tjmd 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 10 cft9 n7ak4ry :omc yf+(.f:ot0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuifff.97o a4y+ ctmoyn t:krc:( t 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 capaj7dp: l * ei*xk4rjp8dcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to ae d kx4jrdp8ip l*7:*j 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 cmlt/,wo3j, zzircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to ,mzjw ,lt/3zoa 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 remuyh. d6mq8d3sistor for a phase angle of ddm6u38 hqy. m$40^{\circ}$ 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 whama47z) pqf7.cdyk x m9-/d;gopgf cz/t frequency should the circuit be driven in order to have maximum power transferred from the drivin7xfk4;zzqa79 -dgpfc. )ygcmd/ p mo/g 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 resistjikgex8e/g1 +syb6i4g;z jf /p/v 6bkance, 15.0 W inductive reactance, and +;8 /b/ /f 6xgk1s vgpek4ygjei6jbiz10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an ACi3m4tdz2szk06x9 u dd 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 60 W and 9xhc08g shng/ a resistance of 30 W. What is the power factorg0n/ xc9 hgsh8?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, l kt o1.u*va3+bl lb8ha 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup b*la l+ 8bhl1k.uov3tply?

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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 aqw, . k .z3l9k7ondlmfrequency of a 1.0-mF capacitor and a 15-mH coil in series?7dwn39m.. o, k lqlkza

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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 )mb p81:ysxb0mz qc9o4.7-mF capacitor for a resonant frequency of 10 kyb8xsp0)mbozq 9 m 1:cHz?

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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 dk s.t0m.zuwcy; h5p .(dw5:brzya:uin series with a 3.7-mH inductor for a resonant frequency ofupyzc5dz:uy: d(w .m 0;.a hbr k.wt5s 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 mujm0e5zkfrkyu6)s+p:m r y4pey8 6 5vz st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuir8uk6ke6 r4+5emf yzypvyjzp)m0 5 : st is to be 1000 Hz?

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