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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 a0o op)t 0x;azxre units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inducti e3a*betzk 6u,1q-,aq fshok.on 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 of wire inm (y7gai 5:wnp a coil produces what kind of change on the inducanwm5: 7pg iy(ed $emf$, 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 magnetiase1zm 7k:5zsz0s- .q- slqq gkfs/ 7ac field through a loop of wire produces what kind of change on zszkafsq - . e07sqs5k/ 7g1q:s mz-lathe 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 ogsbng q n3f0;q9l0 mgtd/8(aloop of wire produces what kind of change on the induced gdg3(n;9ls0ogqf/tba 0 8qmn$emf$, 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 fi* ooud 8ut;o(ko h-xp)ov.yf/ eld 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 directij*zf yak ru2h y(nl+*;on of an induced current in a conductor will be that which tends to produce which of the f*2 l fyh(yn;+*juark zollowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mal0mtkdg0w 0hy; 2 /pkkgnet is held above its center with its north pole pointing down. The statio0 wm0;2kkd/t0 pgyhklnary 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 magnetippze c37ccub(07*avy h qmv86 y38 tb is held above its center with its north pole pointing down, and released. As ibvy 8c vp8 3hip7em6zut7ycq0 *3 a(cbt 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 ay u5 q5do.iag; region where the magnetic field vector points stu.i a5;5oqgyd raight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fielwn zo;62- eo; vzwen,ud vector o;-n,wz ;2 zwvoe6eun points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tae .g40nms qfe-ble top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this. f4esq0eg-nm 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 carri92 4 vkrh1:b22b xg ug:(y s6xqrbgwgdes 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 inducedu6 xwxky 9s2bg:b2v1 g g 4:db2rgh(qr current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering lmp/ mn6( / zg37rmwbwfirst. As the north pole enters the wire, the iw73/l rz6 nmwb/g (mmpnduced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wh1-gz ;c)zjfamlm 1-1 tlb efz+ose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop -mj-cltfz1a gz+fe1bzl);1m'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 aqs 5 pdck5pg8 fgu-0x/ngular 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 of rotpk5xg8g/f- u50s pdqcation 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.ab 92oruh jdr 7.q+0kq)q4oyx
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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 thh vj6v6yb7 6bkat 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 magneti0vi(5w c:hzljc 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 moved 6s sh* ;p6sy2.bngoc unorthward at constant velocity through a magnetic field that points straight dowgh*y.p 6o62sbssuc ; nn. 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 angular veloco2w ex8mdh; c ck8:05 n bcfhayl:99dnity $\omega$ 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 tra:6i4.+ us m6ugs nxo+va-fhg ensforms

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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 rev;zt20+bvb5hswx dk :volutions each second. The frequency of the x bv+t:zbwhv5d;s20 k$emf$ 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 usev+ :cpn6ymk w6oxsw .yzjayh*;5g)inp+(+ djd 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 tha5yr vzeg0m ) 9w9b6cyht

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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 contai1ig x,sq2wr 2jns more loops than the primary coi gwxi12,2r sjql then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the second7)fkescm bm*,9tz :b xary coil thes*t:kb x mcz )f7e9mb,n 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 ix d+6geywd4z wdxz55 /nput

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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 cd9;pj v wgar ttb)ur -17uf xc .n1,bk8-yf/xeircuit,

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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 inemgs315c9ma nen bgv8 zx 06t1 series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the rez5xvtnm6s1a c9m01g3b geen8 sistor 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 an ideal bap)sw*8d0 ueul7e5za.*fs f,zl a r:nrttery of constant termin8aefs:0z rpfur*5slw zu l n)7* dea.,al voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is u5iyleb8ht8h );y:jnconnected 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 uc(ygn qjbwn;d fx 6 vj6y*-16inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connece 4)n;ai z j7udetl jsv*9/z0jted in series to a battery. The time constant for the circuit *ztlj9) i;/ve js7zj0 nuade4represents 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 b+.o/hk 1,zleujq ;dx whhek6qx50. ifattery. The battery is suddenly removed from the circuit. The time constant for of the ci0/,..6fu z lde;hqkxxhj + oe51 kqwhircuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excepkwv(6w (szp) o ofqnm2i)n: z8t:

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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 suppl1) 4kst9oxv.r /sf--xy xf:l4prwjf hy. 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. Inj gi xocs+w 8+sh4.f.l this circuit, the current.sw8 f++g l.sxioc4jh

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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 k)*javf0yd39 /hi ;jbmqzm h,2arun ;factor when the frequency ;/j2r0mavjdqn3* )k a9i byfz u,h;mhis 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 across+:wkvkv5cuq,1y6tkc)q ub v4 an inductor is doubled, the inductive reactance of thatvc:6+) bwuy 1 4ukcqt,k5kvvq 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 v:5mz a;4si daooltage across an inductor approaches zero, the inductive reactance of d 4i5:smaa;ozthat 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. Inxx+p. :cns .zo this circuit, the current.c+ s. zopnxx:

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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 chauuo 9+f05,kqzx qzvq.nges by what factor when the frequency is trix.,+uz5of9 zq0vk qqupled?

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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 capacitorl1xmk 8 8m,d evt:,oa/8jptqs approaches zero, the capacitive reactance of that stepkj l o:8xvatq 8d,,/1m 8mcapacitor

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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 i 4x-a a-x v0ziftb*13kblni,gnductor and capacitor in a RLC series circuil4 ga3bv0-b*xtz a1kxi-nf,it?

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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 cbj*.wlg(ldu1. e xb,lircuit 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 circj3*g.gr3mp pa uit increases if R increases. When pg3j *a3mg.pris 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. T ub3-pp6swk3 ehe 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 impedance of thede/5 8yyh4b(3jy *l(-j p ixsr,svn bx 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 capacit /s(mcspma)lz/b )n yh7oa14y ance both double in an LRC series circuit, the resonant frequency of that circuit za h1)sp/ s / cyma74(ymo)blnwill

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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 r-hn5y ra(zx b(esonance,

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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 circ/gp0x-4 66gd o1yfgzx qcs7izuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifoeffy,bdn vy6of+0xv9q.+e w 1rm magnetic field of 0.20 T. Find the magnetic flux througyv0xfyd. e6ff9eo++w v1,b nqh the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius m*aetoz *(urb k g j-,rw+s,4l0.10 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* sltza k4gb-+(rrmo e ju*,,w the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiw;agx aj:unej an e*)7t.:x 0ueld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are atjuxaa xwtnj :n. 7e0)a:;u*eg 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 reduced vb+l )pk1: sqjfrom $1.0 \; m^{2}$ 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 c 3ok2j3onz2icf(. muwb+o hm ,oil 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 square frame hal +ncz+im ;d+/u3c kh6j5uq with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 zquh;uc am 3h6j/d ilkn5c+++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 ofad .;: m0hs-bspbu 0cr $0.40 \; m^{2}$ 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 areaqpotpl (a-f.9 $0.20 \; m^{2}$ 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 wity,j3dwrm/1nor4xj;(agae g-b 3akums 18b /ng span of 60 m flies horizontally at a location where the downward component of the Earth's magnmeg(snt ua1mj/rk,3 g4 d/wabj orx13 ; yb-8aetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angularh ht.t23 nfj4u velocity of 2.0 rad/s about a vertical axis through one of its ends whil4t23 utn.jhfh e in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator hw7pbjc-e 0n7h3u1 j+(wxjynd as 50 loops 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 of wire of o) pg6 pahf*4narea $0.090 \; m^{2}$ 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 */4l+5zrwq*z4xz lqes,tm qe loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop r4 r,mxslt5 ze4/w+l*q *eqqz zotates 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 t nthtpikv05k:,.( k 4ry7sswr;lg +emurns 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 generatord;b ahzs1( ), ti7pkys with an output of 12 V maximum when rotated at 60 Hz. A magnetic;),s1skbht yd(ia7 p z field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximb; )r:os6 py dly)lu/kum $emf$ 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 motorzgj+plw .dikms74m+x. elk6, operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto uv2z7ve (za7lr operates on 120evlzzu77(2a v V AC, and when 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 resistando:wlc(qf8y :u l/:vm uz4up0ce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is dq 4woluv8yfm:u0 (/p luz:c: 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 connehw p,/xdblhb 9* nkd*gvks19otfsilb 79 .6+ tcted to a 24-V power supply. The operating current is 1.0 A at ful+t d.*,1opbv76is9d s*l h99lk/tfxnbkgbhwl 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 supply.xi;kf4mlrap ,onc9-)u: k*e r The operating current is 1.0 A fpo*m u,r;rakk e4-nc)xl9i: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 prima) qgm,xvyl8jl(u3/r3d2 wv0v vztm0k jqlr-/ ry voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secondu sn (8p+v auuhct)wsk.xp6-;ary. How many turns )sxu8+nuwptc s- vphu. 6k(a;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 turo.t9vw7wauwcbu1:9+ aeq y8s ns are necessary in a 110-V primary if the 24-V secondary has 100 t9s.a:auw87w uwvyeq1 o b+9tcurns?

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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 sbr (vpqcues/7k hg9( w-mpn).vz+7 al econdary coil. If the currenbqw7 /e-c v+vsrgkn)pp ah9 lz(mu(. 7t in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows injt5 u-dsjb(fo:f*v huze9c,; the primary of a transformer. Assuming 100% efficiency, how many amps at 24o-(,9;jf z5 *sh :vtcebju dfu 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 o arz6xw7vz a7v;b w0.a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does th wwx aa07;76v.orb vzze 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 tur+y5 puphs*x* wns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vo5p h s*xwuyp+*ltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil :owo0ctca h2;q h* l -thi;+kvand 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is ;;0 2 qhhkio c *wov-th:c+latpresent 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 hja+b+:-bdq*0,xp*7 fzp4mat* p omnle u z3 ecas 100 turns and its secondary has 200 turns. If the input cuczlpab,j3z tua pbm mo-*xeep0+* 4+7f:dq* nrrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 t5mj/+mmc9 l fxurns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sec +5 9xmc/flmjmondary 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 transfor5 .xs yjbfb*6fbd,5 cvmer has 100 turns and its secondary has 200 turns. If the power input to bb.f*fcsd ,b55 yvx6j 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 V. The voltavi6e*-bf (wx zge 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 primary *(6wze-i fxbvhas 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 A5f3r:a +t ij v5s:bwjm of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of 3rwb +v:m:j sai5t5jftotal 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 rh umcw,x2 )6vis usually stepped up to 4500 V by a transformer and transmitted through a power line of total resis62 cuv, mh)wxrtance 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 t b/qwrvj q+c )l01zej:+ucav /otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not uqc) wu1ae:b//j czv0vql j++ rsed?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission li25iatml7g i3 qne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a 2tiqim37al5g 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 0*3ef0z ghbcg -w;ztdV. How much less power would be lost if the power were transbzhz e003 cg-*dfw;g tmitted 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 449dps b /o*xy+v0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W.ob/s+v * pd9xy 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. How much energy is store dvol4 q,oo/n*:*lnrid in the coil's magn o o *n4n:oq/,*lvildretic 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 induch8-+:yb10b npvig-:: qr-hmmgk z yvb tor. What is this :-k0 q g-:yvrh-h:+ n v8 mbbbymzgp1icircuit'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 ano9ywkv1 o28xq 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. What is.:hzjezfd:ggos n/ p y;hm9 .. 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 ftqrz+mxi f0p pm6z7l8 /*xp1AC outlet. What is the resistance of the lamfm+ pqp18mx 7fz/ir6lx 0z *ptp?

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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 posh8zz:rpm4+hz2n n kzp 6z+n+wer supply. What is the peak current :m 2phz+h nnr+4sz+6 n pz8zzkthrough the 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 tos+c1.hty* -p3yp ve h)aro-v t a 120-V ac power supply. What is the power dissttc*sp-3y v h. y+ re1hpao)-vipated 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 resistoohleu 9o:c/-)j c5 5ep tx3zibr 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 56 ;sx.vwqg/)6+qmu bp, s nnpz0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is 8+zik-oiwh1g * blh0d73+ ano ytd;nu $I = 0.80 \sin (240 t)$. 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 2-w ons3-pxgg.0-mH inductor 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-mHp8xwa6ux emrin0q7x2d - hv)-ldk82u 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 +(28kry 7gkm.vcso( d v/zoife)cg1 a.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary qb 8f:c -k0e -kdq;ivj 7v4tgvfor 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC atd- wypdz 84 cq+jq7+np a frequency of 20 kHz is appliedq4j dpdq-z+7 w8ncpy+ 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 dueok:a+ade6h+ax bf p08 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 capacitiv vdz 1+jzlo( akgr)(5ae reactance of 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 have 50 W of cakaddm 51su.al4v:j 6bpacitive 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 reactan.i cns+t ,mp-;5lcs-jz5upgm ce 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 hi,eyy0 uy gfo2;(a.(p5swoqa 0.010-mF capacitor be 100 Ws.,quy 0w(yay25(;hipg eofo?

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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 and 5 )7dr nd zkcv-fuje1,8.0 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 impedancein4/ 3 dvxef8)+gm vqs of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and)d gxie8 nmq3fsv4+v/ 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:hmm+9yj)ihu 100-W resistor, 20-mH coil, and 1.0-mF capacitor are chmy+hm: ij )9uonnected 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 ijk9d bg:a3q06dlx aeo .xrz :2f a 100-W resistor, 20-mH coil, and 1.0-mF cax6 2rx9 a:k3al:zbgj0dd q.eo pacitor are connected 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 connected in series with a 20 nt8eyd4f b(5) xxit(y-mH inductor, what is the impedance at 1000 Hz?f4tbyt i nxx (8e5)y(d

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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 seux)./r mox v0eries with a 20-mH inductor, what is the phase angle at 1o vr0x )u/mex.000 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 1.0nk:u.agt4 n tw - jf0c8/hf(7e cm(gxl-mF capacitor for a total impedance of 100 W at 15g(c: fwmkegthn8.a/x 7(ul4t -cfn0 j00 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 l. -9rm zxkrytcsuw**2yp1v( is needed in series with a 100-W resistor and 15-mH coi uzspwcxlt m-9*r2* rvy (ky.1l to get a total 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 45 (1dmc9ur 63w zcpa8ajeq;zo*0-mH inductor at 5000 Hz for a total impedanc6zoje1u dmcp ( wa3aq9 8*rc;ze 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 i-oyhg3t, :kq)ftj;m :fx6d a un series with a 100-kW resistor at 1.0-MHz for a total impedance of 150kd) ; oj ax-t,uqht6:f3gy:fm 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 witht4ypy8*frfa3(:x1niyfuz * r a 20-mF capacitor. What is the impedance at 1000 H*yfi 4ra r:x * y(1fn3fy8zuptz?

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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 fovya: 3 nwt wetesz4)6y5op1s6r a total impedzty 1: e64 t)oe5wvwsysp a36nance 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 w(y7uve 3lpox ,fl( wd)ith a 10-mF capacitor at 1.0 kHz for a phase angle( 3pflxuvel w7 ,y)(od 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 resistor at 1.0 ec 0+dg3x;h aws+k0bn kHz for a total impedance of 45ex k0 gw+cd3a0bh+;sn 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 im;cdk2 cw (,mgk;4pui n series with a 100-mF capacitor at 120 Hz. What is the phasek ; ciw(; 4m2pucg,kmd angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, andp-2 elh4taas7.b9t *sfl;p mt 1.0-mF capacitor are connected in h7 a2ts.-*mllte 9 ba;s4tfppseries?

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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,yw oo rry382oxgu1k26 a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cury2u82ow6r 1 xo3ygokrrent 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 inductor1oky34g 5il yg.h.di* /o deww of induck1oew.y.34 i5*gd ldo/iy hgwtive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a serie s+.i5tfpme3 bs RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to s e3p bi5+m.tfa 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)hm gox*- .ysy phase angle ofx.y)gom-sh * y $40^{\circ}$ 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 28jlkwexdn(* , C = 10.0 mF. At what frequency sho l(8*kxjend2 wuld 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 i08ge3 orb,uu 12.0 W resistance, 15.0 W in ,er0ou8 ub3igductive reactance, and 10.0 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 h+zqdcx80;;9w;egu*7hjrl) xkmm v y AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 6vg8jgyy g nwue5nad: 4+3(3 t+3nynsj0 W and a resistance of 30 W. What is the powsgnvn3nj8e( 3+jy g +tyu4 gyd5:an 3wer 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 circui 4ffrbyk-lzh,+qbj 5frlwg4b x4(94gt containing a 50-W resistor, a 10-mF capacitor, a, 44j4x+qflh( g4 rgbkr5b-bf wlzy9 fnd 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 frequency ofh1 9+:c qfwy0lvg*gsl a 1.0-mF capacitor and a 15-mH coil in series? lv cl9gfq1w:*+ hsy0g

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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 resowhgcpou rqvn;s8cg. 4)b 416yq.y:scnant frequenhg 6p.)4rq c1c.sv:8y snugqc4wybo ;cy 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 3.7-mH inductor for a 2urorlv221boc : b,hqresonant frequency of 1000 H1 hub q2bc2olv:r2,ro z?

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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-mH c; ay ;qz sw(n 9awwwfoyx5h)32oil if the resonant fr3h 5 wqowsza)yx9w2y fw; a;n(equency of the circuit is to be 1000 Hz?

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