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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 magne 46yn+jk-+vstmso:l ftic 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.dnn 99c o to37 xlaenc6e;zz7on 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 produces what kind o ,; (wqjozmua/r74n qsf change on thesr/q u, zanqw7jm;o( 4 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 through a loo+s y9fl icpx4hc+4ag,p of wire produces what kind g+,c4s hxlp4 +y9fic aof 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 loopx x7 y4kp y(ilt4p9-wr,/ 2tajl akdm0 of wire produces what kind of change on the induc4kx9r(wa,ydiltp 02p x j lm7k-ay/t4ed $emf$, 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 mag vt1iweq0g,rcu l 27c/ka4nu)netic 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 induced uu 3ao3ib6 b780toutz current in a conductor will be that whicz bt63ub0tua7o u3oi8h tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar maga:f+i,vr-lw f 1s 5vgrnet is held above its center with its nvw sariv -5,gl frf1:+orth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above its*jp; ) r*v.ul,q0xa jhxzlmm5 center with its north pole pointing down, and released. As it approaches the coil, the falj xh* xu q,zlml).05v*pr; amjling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region whryqan3bfj4uf-ei 4 -ep/ok70ere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When vieweij 044fpba/rfno -7y-eqeu3kd 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 9gv05f v+p u78 nihufjthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in thisvn h0j+8v5 gp7uif9f u 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 whr (-;07nzudv 13zv+z p5uogo y*4aj*ewvx u frere 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 disappeaz;o03 dzf*7+vyurxg u* v wo(zur-aj1p5 env4rs?

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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 hor,fd71wi lh q5eizontal table and carries an ever-increasing current northward. Two coihw7 f id5l1eq,ls of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop -xl bx4(r1 mhnfrdk:+of wire with the north pole entering first. As the north pole enterrxf+mbd-n4 1(xlk r: hs 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 c 1vk9y)ahm(ld .4kgka onstant angular speed about an axis whose direction candy1k vk)g .ah(9kalm4 be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at coh 6 jmogj;8vkm+7pvt)nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must betg67po; v hkv+j8m)jm 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.i)6u1;wm s(x,nf dd vv
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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 thaz+ mvxu(cngyl4a*(; jt 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 magnei3vsn)), k:qym h s0uvitn*i )tic 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 (orientedb/alc (gaseaflu 8s;, 6a*b.y in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight d/,(b yl;aaeacf s8gu* sal6. bown. 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 5,j;eo sx(,o23aazap ihped3 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 transfz qq+53aznz*n orms

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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 seconnti0oqdw)gy) 1 sdwfy d b+5./d. The frequency of the 5gw )1n0so)/dw ityf. qdby+d$emf$ 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 usedu /nzatz4wy0g t ;a2c2toy:r ) 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 de0oniv 7m q7sti;)glq(vice 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 loops lhrl:;rt pwes-f) 7298ff2 u zczfls ;than the primary coil then fs2rz8f:ez-wl;u;f tl )lfc r9 sp72h 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 seco/owf9m, w :7c 8mipm8ysu wtn4ndary coil9ityp8 n8f / 7w moumw4ms,:wc then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powek6 frm56yaipz . 0ajw5r 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 resonan lvd+c;j q/1krt 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 inductor are connef,hk,ov3kg d+cted in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, kgf, o+d ,vkh3the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in 7*5 cctew(pgvf4)l qa1 (nv uuens+3a series to an ideal battery of constant terminal voltage. Atav7e1uqptln)e *c+ nav usc gf(w3 54( 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 iy c28m;btb7z 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 inie6+4z9tvu13 lv,c y; iagntnductance 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 connecteduh( t4r1dva/gc6bz5 w in series to a battery. The time constant for the circuit rz/g(h1dcu ar6w4t5vb epresents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The b m xne:ww5ig6b8io):qfl2+r wattery is suddenly removed from omx5b:l)rwew2wf+niqg 8i 6: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 same units exclof cz1jq67mk ao,tbo(4) r9e8m9dmm xy .e o0ept:

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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 ci0w2nwa-cx y8g4 n,d es-s3 mgorcuit, 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 supply5 od1k-nplgx* g1nly:3vfa.c2 kl s p(. In this circuit, the currentds(xll-2. np *l po1 3gackkv1fg5 :yn

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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 qvt4;a z w5+huj2c +(,smltnw by what factor when the frequency iswmtz+2 ;(vhnt4ajw+su q 5l c, 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 akn .;c z3dpab4-qrhu5xh 47vh cross an inductor is doubled, the inductive reactanxuv ph7nd 3z4h-5bhc ;4.a krqce of that 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 across an inductor apu-0i r5j/5o ,jlqb-d ab.twfwproaches zero, the inductive reactan/-j,0qo w5b uf trilj .awdb5-ce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. j:e/ r781fg) pn hxuh*qjvz2t In this circuit, the current28jphxt*7quv en1) r gfhj z:/

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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 ci jeqgxki08.:g rcuit changes by what factor when the frequencqgk:j xei.08 gy 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 AChdcbuem.r bl2;97- qm voltage across a capacitor approaches zero, the capacitive reactance of th.u7ebh9 l 2dbrqm-cm; at 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 voltasdm99( tgp/ w cg)ty3jges of the inductor and capacitor in a RLC series cc9) s9/m tgt(wdy 3gjpircuit?

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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 np :28bxeq cy:kw)saj u4q61qRLC circuit 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 jcd;+nw5s*; 6s l:26oa dt4zv lmbhuo the circuit increases if R increases. When is this statemenj* auho 6t5wnodlls:4b 6dmv2;+;czst true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of qu)h;x m,k58j68t lc 7nanf rmthe 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 mkcr:1; bg5qlk(0v dxcircuit. The 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 ch1s:lo*x *i r t3k7. sgcgt+xaapacitance both double in an LRC series circuit, the resonant frequency of that circu+3* 7k t:*sig1r o hc.xgaxltsit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage058jsib 0n3exmwdm,a. 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 circuit occurs whek59k lk)sd9nf/ rd1tfn

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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 mzr4kd do 1g*zku2-d0x is rotating in a uniform magnetic field of 0.20 T. Find the magnetic 41 k*ru2-zgk dz0oddxflux 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 radiude,1*xve0v/rvp5.t utzu 96;v hobwa s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneov wu.5 0 *d;a z 9bp,uttv6evvxr/1ehtic 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 )ah4vaqin y37 p wkh:.is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnkpvha 3ni):4a7y .hqwetic 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 single loop is reducd)0rovkcrki, d,c:. wed 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 cph (:4l pkcpw8hanges 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 widx5 adx,g(,p pre on a square frame with sides 18 cm. A uniform magnetic field is applied perpepx,d,g pd( ax5ndicular 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 15 turns and an ar-r8:je e u78f:forflva1 ss0 eea 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 wi 2/-3y.nl-qdh aqzzand 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 wuoqu 3 ) ; ev we;auqqyt42jn9r7qr/c,ing span of 60 m flies horizontally at a location where the downward component of the Earth'wju vt4q2uea u7r,o;eqy 3;/) qc9qrns 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 co793wg.hx3 e posn0y kanstant angular velocity of 2.0 rad/s about a vertical axngk9.3a7oxpe 3hy0w sis 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 50 loops and a cross*jn gm2 ur-chg4wb+f:-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 tw2g onw euj-f8w0n/)eurns 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 a pe.-9y/9s6umdkbr5 e3gif kcrmature. 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 magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? .ubp9s ke3cgkef-9i/y6dm5r

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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 rdn mt-+-or8v7w4ulv of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an oujd8 /jwl gxd15tput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rw jx5gd l8j/1dotating 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 dl01ew/:d a msa 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 hy 18aicci, )/e0mabue ave a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a repo; jq 1ei8m3isistance of 6.00 W. The motor operates on 120 V AC, an8q3;io1j pi emd 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 resistance 6.0 W is conneck4q9jbsb5 vi 9ted to a 24-V power supply. The operating current is 1.0 A. What is the start-up cbjq9 sb i5v9k4urrent?

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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 24-V power sffi0:d oo kqtrwl3+3 0upply. The operating oq+w:tff lr3kid0o3 0current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal * y79/gi jolzbresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A 9o j*gy z7b/liat 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 n f *95;za1xcr-tzz gw7/aecoceeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transfor1ee 0x4xov6ph 0pmud+2zzywv2d2mi/38jis i mer causes 14 A to flow in the secondary. How many turns are in the secondari/di+ezv 0xep zuyvh8m16w2x 2s j320 p4mdioy?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are nece ha0 .1lf+/a6+ driuxgibs +kc),a bxju 0pi/issary in a 110-V primary if the 24-V seconda+0/+da0gb ifi h/.a6us+,p brk)j ux1il cxia ry 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 0oo5usurn 12zm-sz r0 a 2000-turn secondary coil. If the current in the secondary 1m onz-rs0u5ru2o0zsis 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 in the primary of a transformer. Assuming 100% e.uuglr.a dt 3/fficiency, how many amps at a.t3.ld u/rug24 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 ofalw+j::j.jj ikiu (t6 ;s0g9l ti7wij a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. ikwi li6.t jj:07 jj9 gw isalj(u;t+: What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil anddxfck 9ep8,p * 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltagepk 8p*dxc, f9e 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 ni0nj mj 0 bguh)9:y.dturns on its secondb nim h)jg .00:jyn9udary 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 turnsb 7r,.cctw yz5 and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current abcy.5z7c, t wrt 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 -ua yf+9:agpoyxy o4 n)-nr5 pand its secondary has 200 turns. If the input voltage to the primary is 100 V, we ayay59gpx+n-r yooup 4:nf )-can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnx/no55nma;8 f3toex hs. If the power input to the primary is 100 W, we can expecn8;fo5mn/xax t o5 3het 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 s-fje*dst 9 ;tchsu:r6og :p1 voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line o ;s9s1tu:f eg6oc hjptd:*rs -f total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The v) pva/zq ol:q+oltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fiq) :/a+lvq zopnd 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 vou664ikx;qdh4kt .nq n .8vkmdltage 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 transmission4nnkh8u;i q4kd kv6. 6dm.qt x 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 ,asf2yqkece+ :*9 co gkm 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, th9qeoe g*fc2ck+ a,y: se 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 kix4blw; oib ;h(67b hxm 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 transformhwibx;h lox4;bb(7i6 er 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 li;lwbf1iv/ c -sne at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead o 1 /sifcbl-v;wf 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 44r g2.dwdjwy(apb: r (4g4maz70 V at 20 A. 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 i(: jr 4mrgay(ag 2.wdw4z7dpbn 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 enee.aj,lljf dp 34ota78rgy is stored in the coil's magnettjlfpd8l aj3e7.,o a4 ic 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 contaiahaq+56,wxj6 v2i ht yns a 6.0-W resistor and an 18-H inductor. What is this circuiy+ 65,hhw vaaxj6 t2iqt'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 whe mx uc),wjc -b :5ir9ww/dab)fre 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 is4hhz+k xs p:d,ojza 7; 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. What is the resgz) te;6 6odaa: srr4oistance of the la;d6r)ot6a:zgser oa 4mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t1 f ftmids/1lj+;k4,w5m vlyuhe peak current through tkfltvl1wm+suymdf1j /i ,45 ;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 thewlyu9oq q f1+/ power diss9qq/y u+wo 1flipated 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-.vf2 fkl lxz c1a-;h+pW resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor itlh x ew ,2aj)8tuq:a7s $I = 0.80 \sin (240 t)$. 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-Wr31x,jonv 7.rbbov r4 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 ama0 z3/h 7windvw)s 82dxq d:d 1.0-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-mH co;4cilw x.8f9 hjjfcpr (pp/(yil 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 coil hau;4k p0enqx i99 ft)8bgdmv7s ve 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 rea)odn/y:w fbwk/fx x- 8dl48be ctance 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;t8yrz0t/pp3bk b8e d is kz/d8br0t3b ;8 pey ptapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz so,zal8e uwkc7 :urce?

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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 reactylr1-t -nnmi as1cwr5 kps4* .ance 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 capacitive reactance gsf+4 13ttq4fxnay,iat 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 reactancv/ozmq g 8zcbq :-2g1fe 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 capacib m sm)llbuut671yaw(5z ( hk-tive reactance of a 0.010-mF capacitor be 100 Wuuzt5-saly)l1wm (( hb6k mb7?

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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 capaci.bw.lz ulvoy ra 4(qho8r o8,-tor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 Wu 8(*rajdi wx- inductive reactance, and 10.0 W capaciuij r wa-*dx(8tive 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 i)lxs(+os2 9 c my:aw y)vw/zgvf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriescm(2/) vwa:lxs wg ) ysv+zo9y?

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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 k6;-8 m6kguv:crj wdo 8;jvvq1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac-; vwgk8;qj6vmu:c kd jv8or6 itor 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 w x ii)wro72g7jith a 20-mH inductor, what is the impedance at 102i) wxoj7gir700 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 connectdr,-kyo3x vs*ed in series with a 20-mH inductor, what is the phase angle atk3s, rdv*y-xo 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 iuea f94)csjp3m0if ;k n a series circuit with a 20-mH coil and 1.0-mF capacitor for a total imfusjf0ki 3p 9)a4 ;mcepedance 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 c umkz(b/)oa v)apacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 20kua) bom/() vz00 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductpndc6i(4b v/ vor at 5000 Hz for a totan6cd4p (bv/ivl impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor v( (fbafh,do: at 1.0-MHz for a total impedance of 150 ,h ofb(vfad (: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 series4lpe7 2 bru4y;;oop :zea9ngs with a 20-mF capacitor. What is the impedance at 1000 oe2p4 ;s;z:u94y 7pgoe nl rabHz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a w++5ay wrrc,k total impedance w wy r,r+kc5+aof 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. ,v6coooshkdb/m68 9 k0 kHz for a phase angle oo ov,o6h bskdc6 /k98mf $40^{\circ}$?

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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 witusthuuqx *kj- .7 3sp5h a 30-W resistor at 1.0 kHz for a total impedance of 4k.7ut-xsq*j hp uu3 s55 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 capacitor at 120 Hz. What is th1+/qn k5 bsulee phase/q5nbk leu1 +s 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, 208k5oynzb: r/)brkf m*-mH coil, and 1.0-)f8 rm*kz rk/5b:y onbmF 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+ 2-- ux9 j,b(mj6ssb b-kliz nc5jbav/(afnn, and a 0.350-H imx,kibj 2jcl 5-u6(a -a sj n(b+9zvnnfbb/- snductor. The circuit 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 capacit;ndgi* yd5,t4s3e y ffbnau/-ive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60ayg4f edn f ynd,s/3u*ti5b;--Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series R/l4sjlbc ) txq9 udi*7LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poweb9)sj* xq7it/4 ldcul r 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 s3p*g2sjsqgxk. v; z (series with a 500-W resistor for a phase angle o2gs* xk gzqs.;s( 3vjpf $40^{\circ}$ 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 =3rrqn9 s*ti) y 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from th tq*ny i9r)sr3e 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 sjys*htl +0; cderies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power ss lty*cj+d0;hupply?

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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 circuit0/,j bsjasvt((. ,mfi j; bmzdcj7wl8 k7.pjx 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 hpc7 d5gl zk8q)as an impedance of 60 W and a resistance of 30 W. What is the powepq7d )z5k 8glcr factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containin*z nk29bw jdl.g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co.lk zjdw 9b*n2nnected 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 and a 15-mH coil in eb5 yt2vwr8gj4 :+9elplu my 2 gn43khseries?eeu 8tv+ny j:lb5m rwg9h2g42 y4lpk 3

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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-mm (.7kkfbpj zo3xzxm0-5 2d)jwl qm+zF capacitor for a resonant frequency of 10 kHz?lx)mmzp.2 z3 j f0o wm(z+dqjb7k-x5 k

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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 lp 5)b:ycwl4awsi9.x 7*npm qin series with a 3.7-mH inductor for a resonant frequen7 x:cnl)aybq .l9m*s45 p wiwpcy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 4nzx6a*5 kr: bu v/bf1p0-mH coil if the resonant frequency of the circup*k1uv fbba:r/z 6x5nit is to be 1000 Hz?

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