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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 flux ed2 n3ude)rob1 xcept

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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 induv6 v ko4uzcuu4f7/f, xction 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 in a coil producev l(jf/3cj*ah s what kind of change on the inv3j /jl chaf(*duced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wi1k/p;h e,vz .sut /erure produces what ki t;e. v,ure zk/suh/1pnd of 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 produces what kind of change on the indzii9c/59gi 8/ rui3zf4tdffo ucfcf3i f9z4zir /9/5di u 8igtoed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field fe70ndj7zlh 9 r03yc8 eev ie.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 lashuiw0v7)y(:* 4fje sxwntp.3s +8eq r.gv nv w, the direction of an induced current in a conductor will*svge0f4. his)nje: 7 w3+rnq tvvxswp. yu(8 be 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 horizonylua(,cd+ *7hi+dhm c tal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from above)hlcyadd7 c +,u*hm+(i

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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 above ii+wld2fj div(lfw.7 udt 0:j 3ts center with its north pole pointing down, and released. As it approaches the coil, the fallin73d(vflljt wu2d 0+:iwjdfi.g 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 regq4,ylxg 63o)g ygqdfm/rjr-, mwx +6b ion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the seo4l+qf rgjm3, / by6grg- ,d6xwyx qm)nse 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 cqsn ; 8.ufh)zregion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the i)qu;8.cshf n znduced 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 :2r2f d / o7bd(v3aga mmh-rsuwhere 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 coil as the field disappears:fa3s/mr(h 2a- g2r vmobudd7?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an evo w/aj5((tpt2ub jx*oer-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curreja5 /ttwjpubx ( 2*o(ont 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 pokvb )(.e idld*le entering first. As the north pole enters the wire, the inducde(.i k)b vld*ed 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 consta1 aq*od3c j 2fashbr+9nt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's f9h d1qas+ 23a*jorbcaxis 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 a8b awx.a+ll(is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, lla+b(a x a8.wwhat 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.r2ia 4cgg y vbx:ly59:
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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 q0boae .b3s0. mze)g kan $emf$ 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. qo6*o85 i mns .rc4ety 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 northward at conwfzl7no u44 rr8 ofqa2:o6;0r5rokz pstant velocity through a magnetic field that points straight down. Make a statement concerning ;p oo8u4nolo0r2rr6 rz7wf5k:a4 f q zthe 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 anlk7 v au u-d5.(n/j6fjfp+ powgular 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 transfor+xz )))uarqqx ms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of mpl *8,5 mmyjlcu 2-atthep2yam5- *cl m,u 8tmjl $emf$ 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 devi0 yl2o muh*bp e-cy.g.ce 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 devokgt8; d-gel c6ei-s3ice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loo;exc .td1+kmn: u e:xhps than the primary coil th 1+ud:x;cx.tn:me h keen 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 uq+5kblrxbt s*i0ixp si1q 0iu(d0 47the primary coil contains more loops than the secondary coil then it is as41u *r+5qsi0ut (kbpxlq x0i70biid

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the2ui zoso6pf 37 power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonam7:ulti,aarrq sg6 /+ nt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an induc32rqo l/:hi;yojiyz .weh(46 dz t ne1tor are connected in series to an ideal battery of constant termn(lz2; t/zd1i yhej:eyo 3 owq4ir6.hinal 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 auie0 vze4nnylib8 c6,5o -i3l re connected in series to an ideal battery of constant terminal voltage. At the moment contact is made wc35b- ei4,lni ylnei0z6ovu 8ith 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 andlcg 085 hlx2imq1spc, resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with induc nn4.o-p ehh*ktance 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 conji/,idsa ceo0itv84 ,nected in series to a battery. The time constant for the circuit represents the time required for thav 0,tjosd/i i,c e84ie 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 connectde4 +vp o6i d na17ekb42io(6 reto/dqed in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time(kved4e ida oi1rn7od2to /6p4 6bq +e 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 exnh4 u2xguap8 8cept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectepe+ / ng:r 9ioyt4im5bd to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the:06va xk4l,ycn lz t0gp;hh0l curren6t;n h l00py4xgc :hl,lazvk 0t

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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 factor when the fre 0,pkbxi sal .)zk-pp4quency is t4i ppalz.)b-kx p,ks0ripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an indum rnq st3:j46uctor is doubled, the inductive reactance of that indut nu3sr6:4mq jctor

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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 acv/ zdamv*lh7u*/r ejgl+ - z1sross an inductor approaches zero, the inductive reactancvlea*z1ruh *m+ 7-dgl // zjvse 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 t0oxg 3cc;e.d2h twh,r2yp.9 u dtedv0o an AC power supply. In this circuit, the curren22 vod hct.ut3x dgdp;ehr0ewy.0,c9 t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancebutm/y7 gb ::s in an ac circuit changes by what factor when the frequey7: m:sub/ tgbncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the ca;p 1rsh7q2 7kxp,mlykaz2op:paciti7m o7;2 sp qpklhz,ay2pk:xr1 ve reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of oqv-92bizmb; the inductor and capacitor in a RLC serieo9bmi2-qb v ;zs 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 is dqayi2spu(- z6 p(a w,pefined 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 circuit increases ifj 306zswq v*7hr1d3nx n;jq rz R increases. When is this stnvn x1wzr*z37 rjq 3dq6jh0;s atement 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 2* xo dsz5ckyw4 tz*t: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. T 8ejlo3pzk5xnb *)-w yhe impedance 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 LRa2p:gsocb 60 0: nbyoiC series circuit, the resonant frequency of that c 6s:bgy ocnb2apo0:i0 ircuit 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 driveneq m * b4:est7t9yvew0 by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cir 5kau/yjw eu9sz5 v76qcuit 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 uniform magnetic fiel lt.mek q+aj49d of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag j4amlqk +et.9netic 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 rads6p+5eoqs8hghn r 3 3pius 0.10 m is rotating in a uniform magnetic field of 0.20 T. F5psheh8q3 g+p sn6o3 rind the magnetic 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 fiel ued3b,owxp 9 8.u(uwnd 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 awbo( u d3pu9 uxwn8,.engle 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 sinon7lsabpt7tc0 (4k m;gle 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 coi ,k9fd)mplff:p m)s) 97z9keov( uek gl 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 9a cxp*vw4w4pframe 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 T to 0 in 8.0 s, find the aawxc9p44p w*vverage 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 turn3bx)n r(s:8fr2 kf jd k4h(f8g tre4ugs 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 ar)yddrm 5dlo7;fqi *y/ea $0.20 \; m^{2}$ 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 flies horizo tw*x*vh tq2o kh/rim, epufmd-+z2) 7ntally at a location where the downward component of tzk /vwmuqh, rx t2h-i*pt7f)+oed*2m he Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a consta (4q48f2,(jvjcrtkj +ofy0o 3dlievt nt angular velocity of 2.0 rad/s about av f4( r8tct2jf oqivjyo4,3 k j+(edl0 vertical axis 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 generator has 5+vv xr ll-t g v6lku9-l6at3y70 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- 7s two7narkl5 hw eq em4qi9,f;p4i/ 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 5trgy5 0vp if)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 rotater50y fvpg)5it s in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wm.zc3 k :y3lm:,xaemyire 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 with an output oje bi u+d4rc60f 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of th+b rucjd i064ee 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 gen3q0ee9kf:8g i-tt8rq6iuh og erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.b omzg qoj iq2q7,,8(l00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00/p mg :8fstjzu q +(e d:bc535cf*mrpx W. The motor operates on 120 V AC, and when runn/f tcp5 :85sbfcu r 3gmmdj z+p(xe:q*ing at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power fk/3)sudjaq: d;mb x +supply. The operating current is 1.0 A. Wbddka )+xj3 us/qm; f:hat 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 connecte(w 9f snh1h4dwd to a 24-V power supply. The operating current is 1.0 A at full speed. What is the backw91shf4w nd (h $emf$ 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 res p ,i88ffkwcc/a1 i8vyistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bwy c8f/ckif8 ,vi1a8pack $emf$ 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 ktpb6): mzeh5mngsj) (tw xos1ch6za ,u54b +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 transformer causes 14 A to flow in the-mi) 0ee7xanh9td* xt secondary. How many 7tx9ntxe)m* 0iad -heturns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a jv::l 2pvk5ez110-V primary if the 24-V secondary has 100 tz2lp5v: jkv: eurns?

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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-l1+n8 khcyz2wturn secondary coil. If the current in the secondary is 3.0 A, what is tlzc w8nkyh2+1he 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 in the primary of a transformer. Assuming 100% effixn5x blnd 3i;no6 h:x/ciency, how manxx dno3 i:/;x6bln5hn y amps 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 at 10.0 mA. 8mr,r3; (isxu* m ygwkqi1s0b p ,p/li oajh:6The primary coil operates on 120 V. Wiy sqr ,:l6im8u*s1k/3rgjhmop;0p aw(x ib,hat 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 tuno6ofsw+uwkq yuwih v5o60onhi 2g 2n.,j 109rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prim vosow5oji+ u1y02 nq 6u oi6gfk.0h2 nhwnw9,ary, 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 tuspn 8b wecw*6 1 dtlsuwa/,*o:rns on its seconwbo npst 8uwacl ds, w*/6:1*edary coil. If 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 a4l0xrnjn7fz);qp4 a und its secondary has 200 turns. If the input curr0up47q; 4zlxrn nj)af ent 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 tud**2fy9;. of as 0fo:hl zteqrrns. If the input voltage to the primary is 100 V, we can expect the ou*ld:e2f f*;h9qtro.y0 sf ozatput voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary haspwar+ :q25zr u 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary topwr u z+2aqr5: 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 volta dif,rsib5h 2p;f6 -87xkhfomadm2+uge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.mdk7b-5arm i s +f2ofh ih6 u;p8df2x,0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volt(p t6m*ml(vgfage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resgt6l m(mf*(vpistance 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 voltage8fdllk3b 77r,*m o:f*hwatx q is 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 the arwfbxqt*: kd83 l7fl*h7om, voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A80pv (ygrkeqi;h97xq r(e v: b generator produces 100 V at 78r er:eqhk7 yg0((bv;p qx vi90 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 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 tl vjl50 3thc(pr2asj ;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, tp;h2(v t3jsc5 ll 0jarhe 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 1c9ni ive ;,eua 6-W line at 1000 V. How much less power would be lost if the power were teui vi1en;c ,9ransmitted 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. tr d00xyc:5f2k52pq eeuo g.r It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exo 5.x0edk qey0f2pr:tg cur5 2ceed 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. ;.sa+n cfas 7hHow much energy is stored in the coil's magnafh.;c +7ssa netic 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 resistv7b/iz /6pua sor and an 18-H inductor. What is this circuit's timuv7z /asbp 6i/e constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 122 x .1 :sbmcdwmus:b6/x+m4obqdx+ zv0 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 l4c)2btq4x 1o)gj rg.umjv3 hinto 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 plac,a skyl3o8 2b ;9zh7usdmsr4red into a 120-V AC outlet. What is the resistance of the lamp9mu7h;szr3barsd ls8 2ky,o4 ?

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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 yzfo 0gns3wh .v u-n11120-V ac power supply. What is the peak current through t 1g3yusfh0o zv1wnn-.he resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is thent0n4u4dx jl 9,l+cte power dissipated in tj,nl9cu4ttnxld+e0 4 he 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 we(a(d 1 g:fjpis $I = 0.80 \sin (240 t)$. 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 8n 0ujome* oza2b n0l)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 50g+c5aklsyt:d e h tw 1t3ka03+-W 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 (83 yn.edkipdwugjs3hc ir . m(,k*:d.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.pm3kn5cd x)7zl(rn u650-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 14.0a ;dnnk84lwi0-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 for 157 W of inductive reactancey;rj7k/ y4vm r1opg8e at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz i3o, q2kk4tlxcbn3gl1( jc6ow s app(3 6c4wlooxg2nb 3,k1l cj qtklied 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.m1*j7uh ; zmu bw7y5-bitw) tz50-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 reavh9n)b+ v :4ndx lhhixs b-h/(ctance 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 zwj9n,+ne7fkl.p *lnto have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120fy4 2ap )yppgv2ctap)(d;j po,: sg*w0 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a u:n j;2cch8a q5i7 tee0.010-mF capacitor be 100 Wucaqce2i ;7t8e:nh 5j?

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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 5.0 V ozr-g 7j6 ibaw(bbn6ea)q* w.?

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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 circuyzd2-m,13 uhw1s2,gbmkdep5h *ehlxit with 12.0 W resistance, 15.0 W inductive react51 ,3p sg-hebdmeykzd,*22 1uhlw xhmance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 205 m*yh8xf ,m,.*i wcuw: q8sle pgxv5q-mH coil, and 1.0-mF capacgle8us m*cwxh , 5.vf*q ,8xwymq:5ip itor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-sgs:.ou sll() mH coil, and 1.0-mF capacitor aresl(g. sou: sl) 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-mH ino5suc ar2ukr xa*vo;f4v 2(r:ductor, what is the impedance at 1000rav( o;2u*kvx r r24:aofscu 5 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 connecteder3fu3+au9d9v( ap bd in series with a 20-mH inductor, what is the phase angle a edu3 bard3 99(+uavpft 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20- bp38n8;iw i (qscg1p*l6gyymmH coil and 1.0-mF capacgs*ic 8 3y(plwq ;b 6y8n1imgpitor for a total impedance 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 needed in series with a 100-W resistor a:uut7w1 kiat8;opgc )qx( 53 ehgs;aknd 15-mH coil to get a total impedance of 110 W at 2000 Hzigu7 k;ax51tt;g3 (:)8cw ehpukosqa ?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hw4-1s k a;johh2lq4 cyz for a total c4w2a1q; lso- 4h kjhyimpedance 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 inypmpk td,enz37ew(xj:cj +gmf++j4pfd 5 r. 2 series with a 100-kW resistor at 1.0-MHz for a totanmdymjf p27rfk .j+x3 pz +5gd4+ec e,twp(j: l 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-foat(+y zszmwbjty,:. cz38c- l/ky *mF capacitor. What is the impedance 8osb(zca+,ctj3wm f* y/ yt :zlyzk-.at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacins1navx9t u*x/c g 36 p/1xrnitor at 1.0 kHz for a total impedanc c*v9gas/p1r /xxn16 iuxtn3ne 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 109a*e .skjpv (sasb5jz8w(08wpc : afx-mF capacitor at 1.0 kHz for a phas(a8pk.8*j9x5 wfjse b0wz c svpa:a(s e 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 i)cxk1m4 p7it9 m9wsuwith a 30-W resistor at 1.0 kHz for a total impe w)7 scxuk9mi94i p1mtdance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capff6kn f 5,6(p3zz+bo u7xvihkacitor at 120 Hz. What is the phas37(k5kx6+fz ,fv6nzhbuoi fpe 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.oanv1zb5, 7*etin bc /+g;qp r9bae5u0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0- ;i*tr71oe+9 v z5bp c/a,nn ub5bagqemF 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 consisnd ue ;a.b bi02+rnt49 ti,wxsts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The cir 9de tax+unb 2 w0;4tb.si,inrcuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, andj :; 8pwcxz 8-pggd1f 0tb1hmk an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What curr8tgd;jw1b8kfpmg:ch0 z1 x-pent 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 circuit containing a 50-W3c vmxovf p7b)m6:d/l resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz 3vfvmd:m/c px7 o6b)lpower 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 iu ivsf ;ah kr: n4kq:u .5pz1gbf(va74n series with a 500-W resistor for a phase angle o ; q7:znb41p uafra:h.fk(u gsv5kv4if $40^{\circ}$ 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. t09fswflk 0f e,pw7 8zAt what frequency should the circuit be driven in order to have maximum power transf08wz7 9 t0 ffklew,fsperred 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 out :c eizz b *as,*uzuc*ohyy/11put in an ac series circuit with 12.0 W resistance, 15.0 W inductive recu s/o **a uy*1ce :z1zhb,izyactance, 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 circui-snvc+q0p.h6f .stc at is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. hxrjn2gd ivo ,ucm*)wq7r1);v j6zu ; What is the power f) uc*ji;x7d,uzrv )j 2gw1qv h6n;o rmactor?

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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 contawaf;hx47 t3z1g0jwc pining a 50-W resistor, a ;hx7 p3f0gac4w jztw110-mF capacitor, and 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 freque ily :y.irm9i:ncy of a 1.0-mF capacitor and a 15-mH coil in series?yiiri:myl:. 9

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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 v uyy;:kmyyk+7 ycv9lq;,8 ey series with a 4.7-mF capacitor for a resonant frequency of 10 kyqv umvy+k7yl9ey:8kc y; y;,Hz?

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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-mvejaa0bi /z0 - t*irhbsw7h2 )H inductor for a resonant frequency of 100e ah )7-rw/h ti0j*vabz si20b0 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 cq82-/yenmbh with a 30-W resistor and a 40-mH coil if the resonant frequency of the 2 8cby-n/mheq circuit is to be 1000 Hz?

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