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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 fu)kxjh-vhx aci-8 3 6hlux 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 wb2m(gwog 1t0 t(6.z gjge tdgx(u* b;states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops otvt t(wc-v,o 2f wire in a coil produces what kind of change on the ,wtovc-t2v( t 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 throun7k01lqbjr5v gh a loop of wire produces what kind of lvjkrq7b0n51 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 .cz .xqu:p i9wrr:;/1haqhc v produces what kind of change on the induced: 9 .i. vrah:qcc;z/xuq wrh1p $emf$, 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 y-so:h j wfy2*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, thek8meaca8it4hv z7s8bgdi5m u 8 e(-f.*vwty2 direction of an induced current in a conductor will be5 z ek( i2w-78ta vg fuymi488 e8b*asdtmvc.h 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 horizontal ta mgl1gep: vg33ble. A bar magnet is held above its center with its north pole pole3pvg gg:m 31inting down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet iob9t*3so6y +rp whp:m b.l4 ens held above its center with its north pole pointing down, and released. As it approaches36hm lobet b n9rpy :s*w4.po+ 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 the magnetic field vectb;iln .xaiyo3l,ne g5//sri; or points straight up. The min/lg;s x,i3n l .a/obi 5;ryeagnetic 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 levy3we) 1c esef5el table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what ce)31y e s5fweis 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 magneticewc ce)c+- xr86xevz 6 field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the8-6x )ezxw c6c e+crve 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 horitscvpc7jz99.h t7a c,zontal table and carries an ever-increasing current northward. Two coils of wire lie flat on thehtc7pazcsj7t 9,c.9v 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 t6e0n a9orf)2 )v g+ugzqmh)h5gn el *of wire with the north pole entering first. As the north pole entt*hla zf)0 n 6+qug5)m2r9g )evehgnoers 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 rotate. p;mx(pv85s viqrc7o d at constant angular speed about an axis whose direction can be varied. In a re5x v .qsp(c8po7rv;m igion where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 constanm. kqc*ujxv omc;l v((2;-katt angular speed about an axis whose direction can be varied. In a regio-;;m x .qkau lv(c2(ktjo* mvcn where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.f2ga zoi(:rik5epv 4g ;:,zrr
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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 x2mf. c-v pu8fmu9hz*oj.p5m 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 field. To, rz/ a z/ h1f)u4s16qchgohet29ckj;btb6ahe $emf$ 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 mp sj pp66g mtwyac817 uwjk37+oved northward at constant velocity through a magnetic field that points strap8 13pajwwcu+j77 smtypk g66ight 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 constant an ;wh-6:uqq xdudxv 5dcbt 7223gt n4rugular 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 tran: /uuv1it:3co40jah0 vvkt hpsforms

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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 revol 80(5umodxnam fs ll*8utions each second. The frequency of th(smxa om8u lln f085d*e $emf$ 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 r85 9pfvxxe sr4k,d ;zused 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 thk4v y/ui:ajf 5/kaq :tat

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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 4(j 7 xda/q ysvl-kw nm9:,+upretih2the primary coil then iyawk2u m/-(7 p nhqi4 :rsj+t9vxl,det 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 pgmg c9tzxq/87j:ne4z rimary coil contains more loops than the secondary coiem7:/8g4qx9 zn jct zgl then 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 i(.q x*od zu9f lgxecvk5:v+ 5nnput

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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 cf0 ;4j4 oe7z9yk6cnvz/tsm xyircuit,

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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 battery of constjf v xihen: -(qmj-o6) qaa;j+ant f-)m:6nioqj+qax; jvha(je -terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to 1drgs:jz5x(u/eq oi1 an ideal battery of constant terminal voltage. A( 1:z i1dgrjxoes5u /qt 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 resistamvju- (w0 /epq(6zfuvxmrmx4n+ tct po6.m08nce 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 resistanfwi,b,/zl-fna0owa :ce 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 connecoep krft., ;p,tzp9* lted in series to a battery. The time constant for the circuit reprfp;lo zte *.kr,t9 ,ppesents 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 in lo: .()dls*itcb sev;ductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current tdc. ols*e)btv s:il(; o 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 thy6,.a vv)7 p7azyvpuae same 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 currf)nid*n w)0zjent

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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, the j0 n*6dfxjd 6bcurrentddjn 6x0fb*6 j

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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 yodzx*fj,8.z4i , nizpu5jn7circuit changes by what factor when the frequenfi.op 78, 5 nidjjzxz4 uyzn,*cy is tripled?

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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 acrossr*kg j yyb e25 p1*5f0:bbdbnt an inductor is doubled, the inductive reactance of that bdygfpj5* * 1e0bb2ybnt5:krinductor

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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 and;yruy0-o t 8n inductor approaches zero, the inductive re ;tyo0rn8 -yduactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,*ntbxrx8p -l: the currenp-tlb8r n*:xxt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor 4a9o itwb-9z0b n4*a)yr1l (ugr bwbo when the frequency is triplilr*-or bnz9ba b(4 y1a4gu0 tw)b9woed?

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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 mfj-(elbt v:to46 a1j across a capacitor approaches zero, the capacitive reactance of that cap tetfj(a 4vm1lb:jo6- acitor

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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 an,uwx d69 2.dcc nlb)spgle between the voltages of the inductor and capacitor in a RLC series cir., 6cdc sl2xw)9 dunbpcuit?

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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 d3yz,2 h g7qk khga keer--*0xhefined 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 iefl u18b*gli 83 tuqj3)h8shi mpedance of the circuit increases if R increases. Whenufi*g)e8h3 jlht3iqus88 l 1b 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 impedance of the circuit increasesb9 r fvx xj7qmht5 q2oi71.z0c 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 thd5h:z,u v c;u6ozlne, e 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, theho;0l ax4*sb1 p1b, fdbgylq; resonant frequency of p b,x 0ql41o;;lg1dbsf ayh*b 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 resonannjj 8zn2gg4zjx z0hf9q ffp+t9n3- )q ce,

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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 ocp7muoruwp(i c1ap* 4(curs 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 magn e6r yy vjt-bp0z9a/ t/-zw6pmetic field of 0.20 T. Find the magnetic flux through the loop when - z/- tt6w9y/v ppeabj0zy6rm 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 radpmvz 5- drp1: tiw.ie)ius 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 and the magip. dr:i vp1e-tzw5m )netic 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 magnetic fieldk o3/hhoo,v9 0eg acg7 of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anglooo 0ec 9h3a7vg,gkh/ e 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 a3k4ob jme bpg.ihjsf0(ci 5 )-djustable 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 co * f7ylzg8 wb,,1pjljcil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squ k84/wje7rp6 d6e9azyep,eofare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifoy,6e98pe7k6p4 ae e wof/d jzrrmly 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 tuo2tzv qcx4hnz); n8b(rns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ari+zl da)k0;zql vq xk1y. zd7 h ;jos2dl2)de4ea $0.20 \; m^{2}$ 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 up .2,ft9zxzt4b.yp b*u0ba eflies horizontally at a location where the downward component p.e*u ,zf ta92bybp.04ux zbtof 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.c2, giiqx -ym-xjzv, at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a con-xiij,,v - ym2c qx.gzstant 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-) zl 0c6ndudhwn tf)8 and a cross-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 turns*an bdn l.6npw, w*t)l of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop,u.ymrwtr5 v dx 3glfr q9**(i 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, which is perpendicular to the axis of rotation, what will be the maximum output voltage 3wig.t9* r5mdrr(l*qvx,yuf 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 cons 9e)1m7sjdmpkv+hk,853audqkz ra k2ists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator win59dzv4d5e rlt8fhm,s c4u* uth an output of 12 V 44*5n dvzhufe r u8d9st5c,mlmaximum when 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 ay pzx 2zqbfgnb;+r2goq62/z7 n5jem- 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. The2s v .3 ;e/whge04aqxm0mjrk p 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 mot2tr*,lz1 fw of c*: /pu-/qqhmyai)tsor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speo*cq1 ,h qflpt/iw- 2*tz /f)u:amyrsed 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 resisqozp1 s1 -tedh 2x-7jt g8wud1tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curwh2qg1ts- d oe z1u 7p81tjd-xrent?

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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 resisbq4 0ylks)9 qstance 6.0 W is connected to a 24-V power supply. The operating current qy 4 blqk09ss)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 resistance 6.0 W is connected to a 24-V power huk: bu10 (doo0v t6)eqjw-xm supply. The operom e-bujo1 (0x6th)qv wuk:d0ating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reducwo))lbspy,3 ye 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 transform(a:hml ;yh xwe vl7q89er causes 14 A to flow in the secondary. How many turns are in the secondary?ye(hl 8lvwa :;7h xq9m

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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 + h xmffe.xt ,6vb9 ql7h-wib,: )wdeqif the 24-V secoxd,)7h,q+ efm bil f9xtbww:6.- h qvendary 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 da c9/r8va-y (kqy *k*rau.vs a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the ck /q uasaa9vk(*rd.*rv 8y-ycurrent 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 t o+j1 6d wrheuvi09yswiv9l--1rg x.zhe primary of a transformer. Assuming 100% efficiency, how many amps e1g+0r.uwhyj9 wiz1o9ri-dsv 6v x l-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 neon sign transformer provides 7500 V atg7b lw -xdj3m2:zvpg: 10.0 mA. The primary jl gg7:d2b : p3xw-mvzcoil 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 turns on its primary coil and 300 turns on its secob ;3 fobfas;z/ndary coil. If 120 V at 2.0 A is applied to the primary, /o a3fbzfb;; swhat 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 m96ymms9c*p3 sd np)aon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,pp m cn9)a3 *mdmssy96 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 transfchv0wui+3 -)j /hf z0nhgk: paormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect h) 0+3h:chv af u-kpgjzwi /0nthe 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 zi4h u xt;6kh0i3l5jumlz+-e has 100 turns and its secondary has 200 turns. If the k 3j +40te u6zhx-im5;lhlizuinput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 svkw0x6wljq c01.,fe turns and its secondary has 200 turns. If the sqw1,v6k0je lw c.f0x power input to the primary 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 w4s:mk1 fy+/bwc +lp gV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the p+km p4:w1 /gybcw lf+srimary 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 ste- b z b0c twt3vp;c6d(w;zum:vpped up to 4500 V by a transfo;( t-cu3bw: v zz0;vmcpwbtd6rmer 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 usually step* znn0kqu2o +fped 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 not stku2nqofn*0 + zepped 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 haqz(85j;guc1 jb 8rlex +g9k jvijpt6 4s a total resistance of 0.60 W. A generator produces 100 V at 70 A. In ordexi8e 48;c(6tzgb + jkr1ljjjuvgp q59r to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W9s dln1yb75fkmv9 /mzypq- o -. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage issydn l7y 1qmo9p9v/-5 fmb-kz 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 nm c8;f .i dkgji6 4kdfm/7y9kwould be lost i7y mfkin dc8j/4k9;mf.i 6 dgkf the power were transmitted 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 trg8trm6lf-yerh k ,8 p7ansmitted on a line with resistance of 0.60 W. To what voltage rmge t8fl- ,pr6hk7y8must 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. Hb9o2ezxiuj:: aqlx33 ow much energy is stored in the coil'subzq xl9 3a32e:o:xij 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 18-H inductor. What i/z4g tmsu 5 6dl1pu 0xqfgjk)-s this cit54j-gxkdpsg u0fum zl/ 1q )6rcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wherjo5 ltk ;+wh8ze the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the pef su/sgew ;qmx25y e*)ak 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 a k.g/tck.r q 7ojv8 xoze/86lis the resistance of the lam ajrzk/8.g xek8qto6 ./cvlo7 p?

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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 ci2o: 9cqcl.,pd:ggrif4 nq ; /sg: rdconnected to a 120-V ac power supply. What is the peak current through the resslico:id/n, q 2.: grqp9g;:c4c frdg istor?

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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 fvovc r205qj:ew4oj +ac power supply. What is the power dissipated in the resistor?vfj0e5:ojr4+v ow2qc

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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 502:vn,cr)c8ker/gqokzs/ (k a -W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is ++b 63 pwmhp4rqfn7r k$I = 0.80 \sin (240 t)$. 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-bndmx:(0f -+mig u7rwyl6c 9y y+ ep*yW 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 iovv ape:gkg0 5, +8-1g-(cijopf + c)hpbsndynductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hz?x:vv1kegut j ;9l5)1jc lbb-d

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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 nh5akk6gnedzlmi:s 2fglw3m0; .l)d0 (nj a 7 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactanrv 1zywtvlv)1li83, t ce 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 whenx /pw qh-1df0b 120 V AC at a frequency of 20 kHz is appl0qpwb f1/ d-xhied 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 h7n9tc 6ni c:/sfx+tx 2.50-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 4.7-mF capacit8 z. hpj4gjmm(cv i9.kor 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 carfe+ vmi)dm:rgmg +pvf,l 135g7fvx0pacitive 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 doeswpe k6cx *y9 rno(nv-x,d;, kl a 10-mF capacitor 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 reactanzy-q qh 3rtpju1+ug :*ce of a 0.010-mF capacitor be 100 W?qqy rz+p 3gu t:1u*j-h

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz .7sp4 gw i/bo8oqrymdm: i k1-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 with 12.0 W resistance, 15.0 mvu) wi00v7vs W inductive reactance, and 10.0 W c00 7i)svvwuvm apacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0- a jlokxw76:b9mF capacitor are connec ojl7xwba9:6kted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH4g ughi /5nza) coil, and 1.0-mF capacitor are connected in seri5/ihz u a)4gnges?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH infidp8;zln2rmlp. . uc8* vx s9cbs /3cductor, what is the impe*fmp.3/bc2v88u srp; xdlnl c9cs.zidance 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 ( pvlo.hn./zs with a 20-mH inductor, what is the phase angle at 1000 Hz.no ls(p/.v 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 cap h 2 abu5yf8u-dmzy0tg,7f9dsacitor for a total im082shuuydzdg95,7fym bt f -a pedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needeoz:71sycu f)u d in series with a 100-W resistor and 15-mH coil to get a total impedanceoyc s )u71u:zf 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- rpkhlz5n6cw,lv ; ,2omH inductor at 5000 Hz for a torlho,pz;lkvc25w 6 ,n tal impedance 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 iya,3//t l7.cz g(h lc p3omipdn series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?lho c(3ziad7c p.mt/gp3,y l/

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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 2ust;; hzc;ysq2 o3pm 4p3x o;i0-mF capacitor. What is the impedance at m;shx ;;2yc;u 3p 4opqtsoiz 31000 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 capacitor at 1.0 kHz for a tot km5i:hn62nd dal i 5nd:2i6hnk mdmpedance 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 n;1ly1u*eq i z*7e * s fnt+udv;jo8ts10-mF capacitor at 1.0 kHz for a phase anqv *fnei 1s78;d*tl;oeu+jys n*1 utzgle 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-:s bl/ f r:idsq flk9s7*rj14jW resistor at 1.0 kHz for a total impedance of 45 Wf isbj/ r:1kl9:sq74 dl*jsfr?

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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. What is the pqg8t- .y0g lhl ipt99dnh;)3)a ppqs lhase angleq9q .l-9l 8itgh;ptgl )h3yndp0 sap )?

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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 resistnl l5um *67bh ;iu7cjry(a*oh or, 20-mH coil, and 1.0-mF c7nl7h5*a cu; m(h b6i*ul jroyapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, amxj;pu(p7hc2 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 12;u(phxmjc 2 7p0-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, an3 i:g pt7caty1d an inductor of inductive reactance 30 W are connected in series to a 110-V, 6 1gip :tac3yt70-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 circuqb24a5g ;n bbiule6 yx ml;/s1it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductorbe2 5al;s 6;i /uqglbmb4xy1 n, 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 ph mx96g- 7bavlw- aku z(-xg4juase angle of 6g x9- gw-xavjlmku-74(ub za $40^{\circ}$ 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. Ath s:3/at cb+l 7zz4z fa5u/5zw mgvwbhc5ed ;6 what frequency shoulzad 7+u tb4w/c5zwa vzcl sfh;5 e /hb:z65gm3d the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resf ei1y8 (iya7kistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when 8fy7 (i k1eyiathe 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 circua0s oupz3,7z(gkf 4 q;c xq2jait 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 impedalc.9fy1 p 6c4 ojaj+hznce of 60 W and a resistance of 30 W. What is the pz. 91jjf+cayl4 c6 ohpower 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 contait 9 +a)5lmnzzining a 50-W resistor, a 10-mF capacitor, anlm5+ z 9zt)niad a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequencq l; )sk/ ajz1zpaeor)x(bv8(ni0l /wy of a 1.0-mF capacitor and a 15-mH coil in series? ei(; x0k()jwr1p)olasz8 lb a zqn//v

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant fs y g q+j8k.;2+vealvyrequenv .; j2alv+k+ 8yegsqycy 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 a 3 rs-z0adw08s pm5az3e.7-mH inductor for a resonant frequency of 1000 m3-ds5a s aw0ezpz80r 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- -vb67rxvv-ebs ;rc3mW resistor and a 40-mH coil if the resonant frequency of 7b6r ;b--er cm svx3vvthe circuit is to be 1000 Hz?

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