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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 magnetic03hm au5f m wigyu+)9g 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 induction states t4 pxc qzitw4e ;a ))rwish8h,(hat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on r5jub hs zrfcvm/qp+9x), t,0b,h g1l thrxv/jf mbp,u,g z+tsh,0 qh)9bc l5 r1e 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 through2hai9 s8tm3de8i ef8 oyf7w/c a loop of wire produces what kind of chh 9 t/os8e7cfam e2yi3df8i8w ange 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 l63 iy4x ezlfirt1v )l:oop of wire produces what kind of change on the induced i)1:ev fir3t4yxlz6l$emf$, 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 magaq8 7 b*p7q2u1fd qnfunetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an inducedru r9dvn:mt9cbcc l8 i 8p-e/9 current in a conductor will be thattin-dl8 b: 9pvcu r99 me8crc/ 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 horizonoe 9e ymym9qs1+ez/ w*tal table. A bar magnet is held above its center with its north pole pointing down. The stationary magne 9sy*eome9yqz/1me w+ t induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a :cgl+ka* n,b)j6 zue) cxkh*cbove its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (w+)jck hu *a*:xzc6)k,nclgbe hen 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 magn: b7ch0ujmee /etic field vector points straight up. The magnetic fiel70: mucje /hbed 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 v x/04toix6v7 wlv/cffield vector points straight up. The magnetic field suddenly grows stronger. When viewed from abo l6oi/xfvw4c v0/xt7v ve, 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 (6s s2y7xq8sxd6w0z ec,zfzztable top in a region where the magnetic field points st6(c zyz sez wxdf6072s ,8qxzsraight down. The magnetic field disappears 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 horizbhfk 8k,9 ,m 8f*p pa3oig2dsgontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire.h 3gp fs9m,k8dog8,a p* fbk2i 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 ii vz4u1 ih6u-loop of wire with the north pole entering first. As the noi z1hiu i-v4u6rth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant an4w ri 4smfstlyn96d+8 gular speed about an axis whose direction can be varied. In a region where a uniform magnetic fyf 98wi ns4l+sdrtm46ield 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 constant angular speed about an axis wh5r e+ u0yazm5yose direction can be varied. In a regio ayezy m+055urn 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.yi 2bfe2 abw3tzp/k. .
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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 ek)rkk 5rz;jp9;j /jo that 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 , z)f)vudfd2yg,.w gca magnetic 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 (or:e;z yuyh*huzsrh0v+( l, gt, iented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a stathe0,(hu s *v;t,zuzr:gyh+ylement 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 constantvdz1l4r8ilus4a8y/u fer 51 p 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* 47xlllp1a r(aj q1wp transforms

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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 r(szz jy*a8/kbpwg 5c)evolutions each second. The frequency of thsb (p*g)w k/j8y azzc5e $emf$ 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 devi epnei *)i6zni 5;ll0ece used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a diu x. .up0lol1 lhr6d7evice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondad uuez 53ra0tx(6n7pury coil contains more loops than the primary coil tha (pe7u3r56 n0dutu zxen 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 seconc m;xyv*o 7 d;ck*-hxrdary coil then irx*7 y-;*hdco cv; xmkt 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 p7j *q ya)ke5 *yg.vg t+u4smcrower 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 circuit,py 1da08f4bqy

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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 m.zej/ s- rn: ;++ seonjngn9dconnected in series to an ideal battery of constant terminal voltage. At the moment grj .denz/+s;m:9nonse jn- +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 jjb glm4k/a (t7c/ow, in series to an ideal battery of constant terminal voltage. At the moment contact is made wittkcm,l7 b/jga(j4 /ow h 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 reszvh ))fo +ls5xistance 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 atct -3 r87oqbt-th2u *sxe2kii ng1 -ind resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in si /xfc+ v3 6hxwn gxyj7v*8dn(eries to a battery. The time constant for the circuit represents the time requirednxxivvf3wx /*+ncg (8dhy j7 6 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 serietsg0uah yuh ol(:*d,. 2)ilsws to a battery. The battery is s(a glw*o2 hthiudy ss,u .0l:)uddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the samg9mry); kufb37 va i30 mu-ttie 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, thdwy6 lzj )db*in2*s hhc2c8- se 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 co/nq jp k6+dwi *lo56yircuit, the current/dj6 ko+5yql pio*6 nw

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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 circuit9fi+ 2:ylz eo:l)o ez3d7 eoqp changes by what factor when the frequency y+lfo) o:3eep 9:oli zz7q2deis 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 acroe/bdpg+sv h03inga g4u -r8x 1 *h1ytdss an inductor is doubled, the inductive reactance of t1gayr /ig-sv0be+gh ut4nxd3 18hp *d hat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acro-0y 1wnanyl,gc c*2x .*kxyuuss an inductor approaches zero, the inductive reactance y uyc . xya01-lug*c*kxnwn2, 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 connecteenr7-jo 0km4 h;elaj+ d to an AC power supply. In this circuit, the current4 ja7+-ejk0; me nlohr

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react 6zavyyz)f4srx.s l- )ance in an ac circuit changes by what factor when the frequency is ts ylz6asxyf-rv4 )z.)ripled?

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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 appro2z6y) nubxmk2aches zero, the capacitive reactance of th2nzmyu 2k)b x6at 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 th02tivl9s +) dcdt(ev ye inductor and capacitor in a RLC sere+l2d0 i) 9tv(v tsycdies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit ikc sfwz(-l0 wjm71n8ds 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 impeda)1m;- uvq vb 5qn*( t6cdoglzence of the circuit increases if R increases. W156do-be ) qzvc*um lngqt;(vhen 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 impeda v(r wo1jw0uj4-+kx vence 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 impr0-bzew/kt8fda o)h ,edance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC v*5av4iaj733ptii m o1z 6kbzseries circuit, the rbvao a 46vtim3*1ii kzz3 7j5pesonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by ap3+ , : 2vyryjld( p6mswywe2rn AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series xwwcf3/x . h8j/;p(fxq.ooh nRLC 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 radius 0.10 m is rotating in a unifot6qnjr-6x zn 9rm magnetic field of 0.20 T. 6q9nr6-n tjzxFind the magnetic flux through 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 0.1r8q nwxdteh2/rm)8q 1k xa8i5 0 m is rotating in a uniform magnetic field of 0.20 T. Find the xdqr 1ak wt8rn)2ixh/88 5eqmmagnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0c*vqivdoo3 2lujj.o- o2xbvf uz28 9a .ul8f7.20 T. o .*z 9v -2 i3u2oxqjobaljf u 7lv2fducv88.oFind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable syr6pacg k,- /2jgzsd 2ingle 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 changu-6e th7kkf 1wes 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 o5svap0c phcjw+ i6c sd,;-o-m+4i m iqn a square frame with sides 18 cm. A uniform magnetic field is applied perpendidp+mij6h0a q 5,;c wipi-4s+cmv os-c cular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 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 17da-wjq,x)mzxdm9wl ,.rn4u 5 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns annb/wlkx 0peh yx/qg* i4/s ae14kb+p ;d 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 gy sy,nk0/9k zspan of 60 m flies horizontally at a location where the downward component of the Earth',zyy/n0 g 9kkss 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 2h8yhnb7 6dj8 i j 0)64r/xzgv n)skxhj.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical y x0ng h7jij)/868 b46nxd)shjk r zhvaxis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generao qbz4 r/mn /zm9,42wn3daxlltor has 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 tuq(: b4duw6m -twv wr3trns 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 3br i4+m(qfj+gf,f bzarmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic3bfg++m b 4rjz ,(iffq field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire(r: +c lv5uj)3acsqzv ajd*6n sxgr*5 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 b6t br-zr-g8w9v-ak l u):pifef h0;rAC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatin pah- rkbl8-; 0utrvb)z i-6g:w9effrg 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 max,(pyqc z0:zwaimum $emf$ 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. (gthngn(;r3rai 1m (nThe 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 6.00 W. Tfe try pvu- 156xhq ..se)srh-afh1- uhe motor operates on 120 V AC, and when running at full speed it generates-htarf. ) xpqhh-seusuye.-16 5 frv1 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 connected to g0d 3b.g6,abl3x+ gplmcj8 cpa 24-V power supply. The operatic c3.l0x8,a3lp6 +jgbbggp dm ng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 6 lel+4jsgt5h:.cn nv 24-V power supply. The operating current is 1.0 A at fu 6njlhg5l :e+.nstvc4ll 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 - z btsrw2(zxfk/q+8,g ty(bsqbd)gj4a.u; kresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0z(ywb. rxsj)t 8tbkzsk,qg+b;4 (fqu a dg-/ 2 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 pry q9jcgrk29pkf t* c+u1i8* qruiet+4imary 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 flmnl4ee.yo-xvg:u,bp l0e k6hre( e. 5 ow in the secondary. How many turns are v0pubr ,. l:oh.e5y lkmg(e6ne- ee4x 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, hoop2wqyp; )0cs st ,f.ww many turns are necessary in a 110-V primary if the 24-V secondary s. cp0po,; w2w sfqty)has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and ad+ftuv1 -wzf6 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currdwvu6 1fftz-+ ent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primarmk5v du 8vcox18i2ns ,mbfy)-y of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow y)xs u v8im8 vk2,fdnmc1b5o- 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 at 10.0 mAmv77lsm ut4bb6z6 q7o y ;tq8a. The primary coil operates on 120 V. What mbmt 6 7s4oa;t77q68zq ubyvl 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 turnsm +;1d2 wwl/kr lx2j0mift6cg;8cg dk on its primary coil and 300 turns on its secondary coil. If 120 8 wkdl j/cx0lm1;i cmwr6t k;2gd2g +fV at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 rf :dma kn(9/ ;fvna0iturns on its secondary coil. I/ :9fakv0rmnfi;(an df 120 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 has 100 turns and its secondar,5pd..d s9v bh)qmsct y has 200 turns. If the input current at the primary is 100 A, we can expect th s.mpd )vc .,qd5bh9tse 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 transfkcj0) ionp-t wh3ml89zg q9*qormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the jqpoz th -*qw)803m9li9c gknsecondary 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 secondary h u c/rwdj3,+sbas 200 turns. If the power input to the primary is 100 W, we can expect/ rbcj+sw ,u3d the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually sk/;jjza5.p.pffc/,2a p yllg3y y*feux99jp tepped up to 4500 V by a transformer and transj9/ffkg*j5,x 9.p a/u; appf2yyj ylzc3p l.emitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 6le;e:e7z5gxz do6e v-f u6t t;t(ou .b0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentag g;6evdtb5 (;e6-zuo7e lfuez :xtot.e 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 i1s0/lt3knqtu s usually 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 theqk13/ttnu0sl 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 hq) ;j hvn+d*:qw1vze pas a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss du: z*pv1d n heqjv)+wq;e 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 lx0v3no6 u0yvgong 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 transxovu3yg6nv 00mission 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. Howpz:(4;k n2 qlb cr 3kf4zjpbz2 much less power would be lost if the power were transmitted at 3000 V insteadfjl:3kpbrkz4c2 p; z24 (bz qn 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 beie-8ik n0a6 hy2lsl0 e transmitted on a line with resistal62 shiy0l 08niea-kence of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored v. 6;rpgj 8duuin the coil's magnetic field6 ;rj .vupdgu8?

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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 andbf06cr n6m 9v7 c+getph9nyo. an 18-H inductor. What is thisp97+9 vte.c onyrhgbm6c6 0fn circuit'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 where the r0 i0xt4)7tv fy (vd/rtg dd c-xfp6aqh9 n2;udms 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 q1ozi7(ras 09dix 1lo a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. +f e,lsc oqz(bnm;/ z9What is the resistance of the lam9 qlo;zmfsc b(,zn +/ep?

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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 connectvk;ul8m fhh ./ed to a 120-V ac power supply. What is the peak current thrvhhf lk8/; m.uough 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 to a 120-V ac power supp :; (mrrwiqva7pn c;-tly. What is the power dissipated in thm ;cpnqw r :i(;7ra-tve resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor jdxw4r :: dm6lis $I = 0.80 \sin (240 t)$. 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 re154mlmd sfu-g6p nvrl eh8) o2sistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i,f tx*sn /gmwowr;+0os $I = 0.80 \sin (240 t)$. 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 g-,(b/mpmb k xkh*6f s60 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 reactanx *y8ri8,sh:dytndc 10m,zm f ce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH c5a+)xq.th )vwjsztbp4.uw(t)w ,obnoil 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 inductive reactance at 1000 Hyixmu :7iaxe3lb2j 4k 7f1z+ tz?

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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 a5tb2s,/ev n 7oaln 9rjt a frequency of 20 kHz is applied t,revbj72l ot95a/snn o 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-;wb/skb e4h ad6nu, 0othlj., 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 capacitob9,r.ti nz o* )imy,9iwp gle5r 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 capacitive reactance at 10 k 1 )g3q;vz o,meoidvtcr9w:o .56fjwuHz?

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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 hav8/lvgp 04kyqp+akceo*4 kp( le 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 reactanpoefw/5z9c odq /of gj/kl/sh0 ;3w* bce of a 0.010-mF capacitor be 100 W?ej/oq/ kf0wh/3bcpz o9oflw/g* d 5;s

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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 100seap 1u 7mz/r0wux.8 bv:l-ah0 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 with 12.0 W resistance, 15fd3uh k0oe kv93b2y r(.0 W inductive reactance, and 10.0 W capacitive k0b3 2 hfur3edo9(yvk 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, q kcsjozp;4 f/z20 9b4pipn/wand 1.0-mF capacitor are connecteo4/9qkn /ipw2jzps4;f0 zpcb d 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-mH coil, and 1.0-mF c4vq(u7obi n+of yn01t apacitor are connecofqnb ni7(0 1+vt ouy4ted 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 connempm2sw-h(6 ajc( v 8uected in series with a 20-mH inductor, what is the impedanema6-jvhws8 p2mc u( (ce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the /anq3hd49zy2 xu6yyq phase angle at 1000 nxyq ahy q924 u6z/3ydHz?

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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 +i8f uj ei*xx(ck5;uy m+6duk 20-mH coil and 1.0-mF capacitor for a total impede +5 ukf u6cdu+x(ijk;i*8myxance 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 nelrh nll( )x (-x*cwp8aeded in series with a 100-W resistor and 15-mH coil to get a total impedance ol-) rlxp a(nx l8*hw(cf 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 45yh*5fzm(in2f14ya *o i 3xmoi;gfs e30-mH inductor at 5000 Hz for a total impedance of 4hg(3in 4io*axy3mm ;*sfyfef oz1i520000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a tk4/jfkn1pz) 2 juxd t:ot1pt) 2zfjk/:njd ku4x al impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is:a6 jo/2r kciomi3i3a the impedance atac/mooja: 32 3kri6ii 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 withp9 q)0c9hk-az ,z)mqu)vjqbk a 10-mF capacitor at 1.0 kHz for a total imped9hqujb k,zc)09 q k)vza-mp)qance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 ).+.mapnzsn20q t fkc kHz for a phase2 fzscn km)0n+.a. tpq angle 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 witq -dwca xeuux )g h6-xa,xfi-f z7:0+kh a 30-W resistor at 1.0 kHz for a total impedance of 45 Wkuhxwx x -ic,- zdfqf-70gx +a u)6a:e?

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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 *s7jet z7w,2ly /yahmthe phaselzh2/ y 7me*wsjt,y 7a 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,yltez i t:tko3so1dz8n *qh.7 rs,7klf3eg :-W resistor, 20-mH coil, and 1.0-mF: 3iho: fez87.llqse 1 n3dyok sgr ttkzt,*,7 capacitor 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, a 10.0-mF capacitor, andxxzi;fskt p)g/ cdt 4v9f.x0lw2* m4h a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circu;s4ftx xmv d)z4.ltip2 *c0/ fgk9hxwit?

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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 capacit-l:kt8pn og gvg cu*hk(q3 .a.or of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flo8 :hapougtkg(-lvq cgk..n 3*ws 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 . pb8llo c)x4 q3.uo nxo)noz0RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w . 0oolcnlnoz)u.p3o48b x)qx hen 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 resisca/91 qbup7dh tor for a phase angle of /a7bd pq19hcu$40^{\circ}$ 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 mFlc0x ypbi8;. y. At what frequency should the circuit be driven in order to have maximum pyy8i x.;b 0lpcower 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 eorkhs4-;t 04 be 3 hvg;l,ebcresistance, 15.0 W inductive 4hhbel,s3ve 0 o;k-ge;4b trc 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 AC ci6t)h,2ouvg,ld49 x hmf paf(nrcuit 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 gsi+o f4ya/qu ls wi5b(. b33cW and a resistance of 30 W. What is the p+b3gw4u a .lbics3( sfq oy5i/ower 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 circewbu l*pki5rd+pzw41lq2 73iuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wheniww bdiq+341 7p l2upekr*z5l connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor :ce83us7)ap.gcjhx )k kc-kcr+a r l;and a 15-mH coil in series? jh37k;u-cp8aa:gks+ r cck e)r)x.cl

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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 serixe eqc o0yc5.gc uh7u2r( k..res with a 4.7-mF capacitor for a resonant frequencyu.kycu7eq.c0ro2 ( re5 gc.xh 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 resonant frequ t*az)le u:i (b2hoc.yency of 1b2alie*.cyhz)u ot: (000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH cov ah;g9krtoev :* ni/1. fte9c 3fa/noil if tak:1*3h9ierevt 9ocn.a f /vo;gft/ nhe resonant frequency of the circuit is to be 1000 Hz?

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