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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-fg3e sr2l ;7erkg p2r units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction i0ppusdf j s*y9x1t* 6states 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 wayvc9mm . 6-yzvo5 q/ahat kind of change on the 9m6a. q/yay- vz5movcinduced $emf$, 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 wire pro-h 0zhi6wcdg;zx/ v4 skqu+-q duces what kind of change uz0vsizgq-wx/c -; hh k+6q4don 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 o5*/j jsnt(jz35dd2fnjvmk (k n the induced 5/fj tk *jnjzsmj (dknv5(d32$emf$, 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 fie/2m+:/+geny m*:mc0 rn iigwdby gm3tld 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 inda6u 5sgtvu )7ai p7mi.uced current in a conductor will be that which tends to produce which of the following effects? mvu5tus)6g aa77.p ii

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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. vdq5uk,y mn4* A bar magnet is held above its center with its north poldq* m,nvu45y ke 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 hori*2f dyjr8t :44nsz 2nqhuwhvqh h02z5zontal table. A bar magnet is held above its center with its north pole pointing down, and r *s:4zw2hdj2 hr2hfz 5nhyuv8qnq 04teleased. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a rvbuql)i6,c .j 9g1p ljegion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this co. vuljg69j,bl cq)ip 1il 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 fielvwepmf m)l(/h 7ca*m2d vector points straight up. The magnetic field sudpf2e( a) /mm*wmvc7hldenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where th9f4uq+dc7 1rcr1l//bs ha muxe 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 disappearsb7x1//ufa+ c l1qhrc du4s9r m?

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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 even)a.+xe/aejggbngr0zvx21+ r-increasing current northward. Two coils of wire lie flat o azeg+anjx.n1xvg/0be+ )r2 gn 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 ofkr+dm fq:f jhurcmi65 2 (+b(c wire with the north pole entering first. As the north pole enters the wire, the infkm+2j5bfi uc6 + (qmdc:h(rrduced 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 9 8rlj8+(whe8 h,n szto mo23mlvspn0angular speed about an axis whose direction can be varied. In a region where a uniform m tl 8,v2 e oshn3m(+wmr0j9lshop8 zn8agnetic 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 constant angular 504 4wq ctyjx,r6v q:z3a n5dwjy2w erspeed about an axis whose direction can be varied. In a region whe e,:ntqj63545zrrjw wayw yxv4 q0dc2re 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.k e(xh9bl de95lk*e m9
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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 8fe/z 3 9*ook(tqhpxdthat 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 magnetici/wni s noq) ao lt:+i6)nq-4p field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved no(wv1swys ok+bt+r* w,rthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrv+ yw,(kw*brt1o ss+w oss 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 confnhx9pf21)ex4)yp;n*rxe e ;la-q ah stant 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 g.jt7ctv/ dzh2p7w/5hr*ee au3:bjgo g+c ) utransforms

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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 tkuh p 428xzl( dd*kr18sb1kpthrough 60 revolutions each second. The frequency of t2p1db8 1h sl*r k(8tdxk4p zkuhe $emf$ 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 useot 7 sfv2zju qp+3*(pod to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device twhr.zl wj:eg +5-lcm4hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than th ;zi9 j/pa;jcm ty ct2..ww8pwe primary coilcz. ;i/jmt2 t9aj.wpcy;w w p8 then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the sec l2e s,h 8xn,d1i3m cwvdl3*taondary coil thmixv21n,dt 3la* h ,el3s8dc wen 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, theqq. )j)xetd8*wd4,echf 4 wzd 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 resonant circuit+cqz ov,f*ghp)c:n v(,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected iz3 3oq(si2gran series to an ideal battery of constant terminal voltage. At the mome33z iro(gq2asnt contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal baw02i j gzcb38jttery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the ind g80 cz2j3jwibuctor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected 8rw)znn*; a ikewj1) mto 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 ai.+un 4ky3df k;a;w1b tzscb;0izc k 8nd 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 serite 4i5 .):fp -dr+znmmdkfg/nes to a battery. The time constant for the circuit reprn4gd:mt k)mr.p fd fe/+n5z- iesents 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 battery i,;grf q2 q2dw59rzwmks suddenly removed from the circuit. The time constant for of the circuit represents the time required for th,k2wf2dr zrq95; gwq me 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 excepl 9m/5l7vxl+fy)dej o t:

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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 .nj s5g; fay7k+i*ig fthis 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 circuitghfw0ls577n 8t *vrac , the currenth7n80slcv5f *twga7 r

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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 czr iq:eyj z,pza59 -7xhanges by what factor when the frequency is triplz :z5yi,xjaz97 pq re-ed?

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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 inductor isdcxay/05 a- jf/zowd1t 5zf9ki asl )- doubled, the inductive reactance of that inductok-) fd a5a t9ji wzlxz5/fyscd/ao01-r

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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 byvt/zmd5o r gy-499 facross an inductor approaches zero, the induct4bdy-5trfoyzm v 9g9/ive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the ci/r5 forf xp86urrento/ irxrpf5 6f8

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when tskqa*dxr 9mz)jgc 3,o 6 aeh/*he frequency ixoha* q sea/g)*j93dr ck6m,zs 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 a wk 1y84jjum0zero, the capacitive reactanc10wmjaj k4yu8e 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 volta40.lqw0 y krgph+d 4d5-eyydwges of the inductor and capacitor in a RLC-pk4.ydd0h ld4eqw yr 50wg+y series 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 RL j rfsa37;,sul* ss1:e ed+guuC 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 the circuit increak+jsu 2v1 lvx3ses if R increases. When is this statexs juk32v+ 1vlment 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. z)ic5y69vee,(8 mmada w 7ny qThe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the6w2dftp6 8 qkb-*pcg s 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 c (li *nfu j:83kzetzy/apacitance both double in an LRC series circuit, the resonant frequency(zlkj/z:u 38nite* fy 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 an AC applied vol u agtqoc 6(gd v3:kvvr;s1,7ytage. 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 rui(i)wuzy ,l/bmf+ .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 .z.c x i: ir(b6gtc/dafield of 0.20 T. Find the magnetic flux through the loop whe/c :rt..gaxi 6zbcdi (n 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 0.10 m is rotating in a uni7iv z yduez23u(-n i4xform magnetic field of 0.20 T. Find the magnetic flux throughvued2( zii 4y-3xun z7 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 fieb0++4a ka/xsipkuki0rb76w+r f491gdaz a ydld of 0.20 T. Find the magnetic flux through the loop when the dk1g4 r0kykau+47 i6b0a d+fixa9rw/szpba+ 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 adjuf8hj- +pm(idu stable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil c+/-hzaa06meuhy *tk thanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. A c m0l/4b:+ab 5ilucfduniform magnetic field is applied perpeu0d +lbac c/f4mli:b5ndicular 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 wivfh. e+cff5u8 t 8zs9wl 5k7lwth 15 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 and/f0qjha ld e86 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 span of 60 m flies horzwb/ iflq(:yak x:6-f izontally at a location where the downx(-kq/l6:yfz fbwa: iward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar thato0u0vs zw /cxf ;h*s9cju ,-kko6num6 is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cos ofuh0cz j6vo*/mnx 0u, -9;kkcuw6 snstant 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 generator8tx d, mr7ax 5t3a54oj qod3im 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 consistqlp/txtj 09tb e8ar8q7wqw 72s 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 $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. gea4j323hy+o9s ojm sEach 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 3g+m3 s 9eyhjoo2sja 4of 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 od/ a/: 9phe1lsj wjw ihq2n6*wf 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 o88 kcnxdigi9u zqv0+dv 7vx,v:*m0vi f 12 V maximum when rotated at 60 98i,d0 z8d+vnvg:vi70x i*uv k qcmvxHz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxe pwp)//m c f nvjp/m1-gt3q,0usz26 r-eucpiimum $emf$ 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 o 5i4nt 8pf da,snu(p2zf 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 hav.g mwar))z ez3.u id;fe a resistance of 6.00 W. The motor operates on 120 V AC, and when running wami.3g)ef rz.) ;duzat 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 9 lbz9z1k0s+ fpt7y ks6.0 W is connected to a 24-V power supply. The operating c 0sz1l+kkt99y fb7 pszurrent 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 resistadjw1ca / m.r0vrq5u :wnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bur5:q 0.djvwma1/ rw cack $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pm ( vgccf6-a1g zlxz0*ower supply. The operating current is 1.0 A at full speed. What is*zgz -v c6mfcl(1x ag0 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 resb(zz eh88nh6cx6 1v wduce 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 transformer causes 14 A toec i:4wu,.wew9kr-vp flow in the secondary. How many turn pu.w4e:-9cv, wri ekws 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 110-V primaqoesr kx:g2.gjf +-m 8ry if the 24-V secondary has 100 turns?sxq8-k:g efj .rgo2+m

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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 50tb8 :/wpn2 ajf:bw d1x0-turn primary coil and a 2000-turn secondary coil. If the cua :w tn/xjbw1d: pb2f8rrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformers)kom h72tzfr6:t1sg . Assuming 100% efficiency, how many amps at 24 V can flo16hrots:k2)gms ztf 7 w 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. Th , qz*)(bx1h5wwjfxl8r6- v er4ppmhy 6po fo/e primary coil operates on 120 V. What does j*1r z5 pehfm,w4yr6vq/f-h8x opwx obpl )(6the 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 prim,n:(fwdxu,x p vp0i+ ;xzeg (zary coil and 300 turns on its secondary coil. If 120 V at 2.d:nu( wi0g+ e, zv ;(xfzxp,xp0 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 an :+ 1whr(su jd(2tgppor8 y/ubd 300 turns on its secondary coil. If 120 V at 2.0 (wo(u2pb+r hsd1 8 pjryu: tg/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 tra xmpy g0by r9xl5u243y6 uzd(znsformer has 100 turns and its secondary has 200 turns. If the input current at the pr 25 xgzu z4y(x6dmp09ylrbyu 3imary 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 turndcnt 7w:j5xf x:9xi6hs and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the h7nt:wxj xid96fc5x: 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 secon1n:v1qal )p11 z3pi5 buhlofuyoh/ x6dary has 200 turns. If the poweru uvh )1o/6flo1 3n:la zpib5xpqhy 11 input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u a(w+p, x6kntup to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary t,pa6 wxk(n u+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 voltage is f5 idpdjelu i03n1.c 7usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find5c30 1pdiel7uijfdn. the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually ste hk87bk/vtnmk ;+pc1x pped up to 4500 V bvkhmx7cb;k+t/18 kn py a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not 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. A gene*qwk7zjr-y f ;rator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line,y-rqw;f 7 kz*j the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 dxf16eya-: ii W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy x6 ide-a y1f:iis 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. Hs/n cfjzl,)1 vo0yt 2yow much less power would be lost if the power we)vftnj0 / z,oys1ly2 cre transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transezs rs6r0; d,imitted on a line with resistance of 0ri0 ,edsrs ;6z.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 energybe:b 3/z +izqi yi1f-obo4 cb d85ca.o is stored in the coil's magbz io/4ecfazo b-qib 5c+ib8 y.: 1d3onetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Whatu pscmsqp uq3 0q1pt+e (f-0b4 is this circuit's time c-qc0btmq0 p 4su+u pp1fe3(sqonstant?

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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 circu * -kd -m6ipyn*jz6twr*vr gkk. :b0hnit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whatw8/y g1 79wl flfhz1/3juvyb-h-nkj g 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. What is the resis wjil3) +wh,oitance of the lamp?o)wjhl3+ , wii

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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 suppe35v(be 5ce3 xa*ar)yxls i)xly. What is the peak current thr5 xv) ea yxs3)ecxle*53b ia(rough 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 supply. What is the peycnhh /vw y7p;;x dnsqu03hl(+6wk 5ower dissipated in 5/;c (0h nek+yq3ynwud hp7 lx wh;6vsthe 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 r,sc qpiqspo3pb tn7n8-n 7v8 *esistor 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-W8 3; ogmhel8rddmh g9* resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through p/7 g/rncj v7va 50-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 1.0-mH inductor at 60 h z0zehglc6on:x(q..c5bu m wf +9fr 1Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1006mq;cdc1sk+h 0 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 have 14.0 W of inductive reactanclw*a1gd1n;x q mbp/a1q-nxn ;e?

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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 1dsr1 ;k b:oq8y+aitru4 3 *dis000 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 induc jkjjk))25bfh tor when 120 V AC at a frequency of 20 kHz is 5bk 2kfjh) jj)applied 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 11e1m (wrcik kt9d s511g0-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 reactancey,bu rwrek5 l1*sv g:f/(6eyl 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 5f n jh,x9:t:d m(e7eu2siu+.f bvi 9jy0 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 doeswh4z c)tld, s) a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactan0 pjs9t4vi z1+seb45vki jn;tce of a 0.010-mF capacitor be 100 W?bpjs09 k5v 4t+jneit1 z;iv4s

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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 anur i4wfokn,;/6o ietag azt 7ox, :,p9d 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 bd+h14( yxl2dor scxmbg c( z ;k)*)lr12.0 W resistance, 15.0 W inductive reactance, andml krxc 1loygdr4xs*2bbd(zc);)+(h 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 11i23kopurrqr 9r f o0;500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connqkfr3r ;u1roo0 i2p r9ected 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 aqk6rw3g-68r u fv1bkb 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conne3rkvk wrq6gf-168bu b cted 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 inq-tg sk9 p.8vaductor, what is the impedant.spgq v 8a-k9ce 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 corpe9n(e mya83ds r7w2nnected in series with a 20-mH inductor, what is the phase angle at 10007r2wms ede8p rna39y( 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 need2 kp oaz+irv7*hook6i/4mrx+ ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedancerm /ixro*+a+6 izhokk 27opv 4 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 resinocsrq 71. i) 7i3g9wimi ;quzstor and 15-mH coil to get a totai;iw z3c.iqnsgimo7) 9 7r1qul impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with 2gjxwow1;s9pa 450-mH inductor at 5000 Hz for a total impedance o;wg2p9 xs1 ojwf 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 rege0)9ar5 oy hpsistor at 1.0-MHz for a total impedance of 15y o5ge 09r)aph0 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 the impemnbc1 ycz1 : gr7pu84g.p-nd edanc .ccun 81p-z:nd1b 7gygmrpe 4e 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 capacit fln)1cpj tz/ty6q;7 qor at 1.0 kHz for a total impedance of 45 W?yp/qnzj;qcft7)1t 6l

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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 kHz for a ph2mtun,v kn 8.oase angle kom,.t2nu 8n vof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nqn1fvvao65b9d)mdlryd*wl /m6 u.y-eeded in series with a 30-W resistor at 1.0 kHz for a total imped69o.ldm y v*ryvuql- )wd ab 16/mf5dnance 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 capacitor at 120 Hz. What is 2 -w32uwk3j2qog ltsch8lat s:tf6t7 the phase ag33s 7 t8t6osklhww-2cauqf l2:t 2tjngle?

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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 a9hx,i5s9ql y r 12bbt100-W resistor, 20-mH coil, and 1.0-mF capacito xsbaqy5,92rhti1bl 9 r 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, and a ll5 c6gtyq w.g8 .sdg(0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is t .gwqs5g6ty dllg. (8che 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 ca.t pk*3 a yvto/t8 nwn l+u3s6h0ytuk(pacitive 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 flows in kwypkt t +*ut0n oyvlut h833/an.6(sthis 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 cir l/h 2ocd3qw535pd9 1 xxcrwtxcuit containing a 50-W resistor, a 10-mF capacir5p1/dxt5 2odw9xx3 wlc3cqhtor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-m5r6;gw,/vw khq yhe1W resistor for a phase angle of;m/ wrv6kh hge,wq15 y $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C x:9ps3* zb nvd= 10.0 mF. At what frequency should the circuit be driven in order to zp:xdbnv39*s have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series c2;o y8bx,/v3tpgf5ol+s e;( biyu ntp ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive rea+8 ;, /x5o3suyigvp tt(opb fb;ly2enctance, 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 anc+usmt9p fsg9hs+0 ic6/z sl0 AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a re1( par cqb+/bfnhn(8osistance of 30 W. What is the power factorc1/bh(n nb (oa+rfq 8p?

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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 contfosm;tg)(cpp7 d-5 zraining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz d;(7rz scfg5p otp-m)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 cap-(ysi: v x-cgbgvx d1;acitor and a 15-mH coil in series?v :g gcb x;d1s-vxy-(i

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a0s*d 1r) srl)z q;bi vjea7x7)zyk1k p resonant frequency o ldvjzka)*71iez;ssb1)qrykp 07x )r f 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 al*9i v.8nnx2pm x,cd for a resonant frequencam2pci9 d8l .vx*,n nxy 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 40-mH co5xxqo+ 4rdtv( il if the resonant frequency of the circuit is tox+o trqd v(x54 be 1000 Hz?

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