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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 ma3fix h2c+z xa,gnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that(bfg2fn6xa a , 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 w 0tf8ce 9pcc/gb3al /kzee 40tire in a coil produces what kind of change on thecltzaf908 3ee//pctkcg4b e0 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 magnet1nhsyspxw (2 /p2 :ijoic field through a loop of wire produces what kind of ch:ps o/1w 2( pnsx2hijyange 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 vy;l7wo q e,me;(b4 uvm1m.cdof change on the inducew7mcd ob ;.14v(l e;u,vqme myd $emf$, 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 mam5x: *eevutf 4gnetic 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 ojlq))h6aea99 +ibq t direction of an induced current in a conductor will be that which tends to produce whic 9iab o6+t)ea9jqh)l qh 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 magnet is held nok l,3kx,myq5*y3h 1 eh*c xrabove its center with its north pole pointing dowe m*yhy3 okn,kx *1l,5r3ch qxn. 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 liesvc 1b j84e839f s)g2ibiurj hs flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fallingh3c8r fbsi2 jui98) bv1egjs4 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 where the magnetic field vector psfp yk.:2byz( oints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in( byf2 k.py:zs 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 wherees+ 2lncs.xe3.b3bltini75 z the magnetic field vector points straight up. The magneticxi7l53n2eb.t sse. i bnl z+3c field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizoxbaa;+b ( oeqk.1ejmw:y u.q5ntal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil +.:obubk(ye. aq;qe5mwj x1aas the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal8u1* eryj u00no *cilkhk+m:o table and carries an ever-increasing current northward. Two 00e 18ou *riymkcuhk:lj +*o ncoils 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 throub 2ak 4nob42qny 0tta+s,sx )ryg8zw5gh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced curybrw 4nto 2n5+sz42yg aba8,0)qtsx krent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speeu74s 2hgn pc)td 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 )uh p 24gtscn7axis 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 xvla * 5er/cvp(+r ft/angular speed about an axis whose direction can be varied. In a region where a unifo/ /r l+cta *vr5ep(xvfrm 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.up7qxl)r+b /6gsf hx 4
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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 th;j aec3;+q ag3j*qpk/-ns-jz3 gxql pat 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 magnetic fieldvn6o.4nxy k )njhoe(1 . 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 in7ty/g j.:kugl the east-west direction) is moved northward at constant velocity through ag.tlg/j 7ky: u magnetic field that points straight down. 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 velocsy/bhm/gpp;9 bda 1/b f8tkbq( 09dunity $\omega$ 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 lb aoaxpe a f3t- l21d4 :qt969s3zkqitransforms

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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 fr;gy8 3401o hd)rmc azs3hqupmequency of the 8mp10ymha u qz3 4o) shd;crg3$emf$ 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 de cinckm.*sgv0-r aj+ aq0k 3l-vice 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 device thfh lkyzoqt3y37avgq.8 (p(k2 at

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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 secondaryhvt0q3 ;/bezl coil contains more loops than the primary coiq3/lzbv0 ; thel 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 dyy98rr .mt7 xthan the secondary coiltx9y drm 7y8.r 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, th / ju:xyd4rnl.e 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 cijct ;x*sa-h(. ;dwpk ydq7h l,rcuit,

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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 indur8np2+s 2ba kxctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made wi8k2pn sx+bar 2th 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 topgc )q*oxfkh 3::zc z5r3k0yo an ideal battery of constant terminal vzokqzf5*c:3 chg3 0xpo ky:) roltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tklmz9w(d 4kqyc r8.(y-0rx i yo 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 anbjdqjv 9290q*.ej cwqd 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 serum/cb a 1yav 83:tjyemj7vl3 8ies to a battery. The time constant for the circuit represents the time required for the current to reac8vm7jmcvba3u/l 8yj e:13ay t h

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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 is:hw9gm: m q;wnguy t65z,p0n*e4iol i suddenly removed from the circuit. The time consta, u ::wn6wyqni *5zgt9lh 0oemgi4m;pnt 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 unitspoz+ )sc3uls e)m2c l0 except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC rzcgr4z/l*ps 0 c+/za 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 guj(m1x innu7oy:.f6 an AC power supply. In this circuit, the curren f( u6n.ing1oxj:umy 7t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance oh geze2vl3m*:zvi1i i b3)f/in an ac circuit changes by what factor when the frequency ivb3fez)g m/*o3h ziilve 2i:1s tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inpi*d gfub0- 8nductive reactag -b8n*p u0difnce 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 9we: 3zkgea*4 neppy2the AC voltage across an inductor approaches zero, the inductive reactance of that a 4n2ypke:zgw*ee9p3coil

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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 dbcnz )(2 lyd4 wrh39sAC power supply. In this circuit, the currentcdnr9) wzdy4h32( lsb

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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 aci9a. . m.lqsiw circuit changes by what factor when the frequency is trips wli.iq.9 m.aled?

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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 z+9- apd 2,2dnefwax .ga u,zayero, the capacitive reactance of that capg ,+n2wd-aap2zaf,x yu .ae 9dacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor i rp yyg01,cm6in a RLC series circuir0y,i1c gy pm6t?

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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 mlo8 m)ow/sv-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 increkwi,rf*m x4,h lo 2r2mqy* dgosjt/3/ases if R increases./g3, koqw ,x* r h rsjmm2d4/y*2liotf When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The im 0e2h+kj*s-7kwbnid dpedance 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 the circuit increan/zxycwdvxz m3 z;9c3bt9g, z (w z-p;ses if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC p:uwrtggmuzs(9t*(ntm3 )o ayp5((d series circuit, the resonant frequency o3ur(t9) g5m:sgwdu*mtoptyp( n (a( zf 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 6r pm uplurh8860j/nn-bs 04j99tbjj gzk4ygapplied 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 RLCyza4-m:a /kff circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifo/2q 9tprwfi rs*e*. fsrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of ti*f* rsp/ fqrwe92t.s he 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 uniforakb)gnfj3pp1u+ 9g d1 m magnetic field of 0.20 T. Find the magnetic flux through the loop when the planu+p1j dk9) 1n 3bggpafe 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 6) 4cbzk t ahlv,lnc07magnetic field 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 angle ofz)4lc 6h lv0t, 7nakcb $30^{\circ}$.

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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 adjustoaqpyool,; 8 5bewi:78ak8e*x lka1 r able 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 c n3)mzm b.gut7cv9 8eroil 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 squar4mj4j ucg ea9a dksm*6b13 hn8dr/u/te frame with sides 18 cm. A uniform magnetic field is applied perpendicular to thekta/a4 4sm1 g hc8nm9b6uujr 3/de*jd 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 ture.z mgl 21crbyr+ 9 rqa*qpe7)uv7t6cns 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 yevu,f0+7h wa3l ;b g.2,-r xq tebjqnarea $0.20 \; m^{2}$ 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 +0waj0 73 y izwyc5w4ch 3gmfh60 m flies horizontally at a location where the downward compone h 0gjyw0wicy hf343a5+7wmzc nt 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 that is 2.0 m long rotatn(ippqj*qmgubee86(h9 )0 l.z h/ldces at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mage. guc/mlzqepn06 b8l(hi)j q9( d* hpnetic 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-sectional 0qzzg 9q74csz:qps o/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 v/0q- z 1r7ffs y6asttof 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 :o*v7hfnm yt8 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 rotates vtfm8n7o*h: y 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 wire of0qhn4 :,famui 4r)9bty dt+f y 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 tjrm ca2f)o *,qmu43b a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is 3,amm t4coq j*2rubf) 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 jrh0wrz(u q+ /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 resist .kf,t ,mgob 5 e-ydpvly7:ok*ance 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 ha 1:jzjxj 5i(+lu/pmz rve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a b1z j(u5pji/+ xjmrlz :ack $emf$ 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 supplyqt b )sxaum v2:f1l25k. The operatbl2 s5:umf1x2akt) vqing current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connrea:q6clb*p ;qh.a 1 zected to a 24-V power supply. The operating current is p61arq *h;a:zbcqe l.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 resistance 6.0 W is conn z;lwv byd5r+9ected to a 24-V power supply. The opvrw9bdy+5l z;erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce atbn cdc87 fau o:7z0w7 ei+tbh31(oyi 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 1vmnc*s.t pyc92+pnk the secondary. pm *921c. + tkynspcnvHow many turns 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 nesbynhb . oi.0-tns (9wcessary in a 110-V primary if the 24-V secondary has 100 turns?. bosb90ns(niw- th. y

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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 lqu 7t m2m:rqld 9ea;9500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, ltlm;q r2 ma:9qe 7du9what 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% effil l5m92cr ,zxzciency, how many amps at 24 V can flo52 lzm9xcz l,rw 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 transforzf9w.w 1cm q5smer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the. s mzw9f5qc1w 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 transformerr(a/js7;fvs9 (e zw mw has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 Aw7a9mvs(f;(re sj zw/ 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 t am ( :(fglzs5; .d9)qvklxlx5vn,rpyef,*a p urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the ; 5.,)fs5ynavgzvpke(xfl:rl a9*(qx ld ,mp secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sect*k g qj4b8i1n83v3 ai.oaez eondary has 200 turns. If the input current at the primary is 100 A, we can expect t *tizi8qk143b3 jeo e vnag8.ahe 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 turns. If f6vj q( d)yn:uthe input voltage to the primary is 100 V, we can expect the output voltage of the seq df:y )(nu6jvcondary 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 od-j *ptjxj 1.i-k h1fturns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictioj1-1-pjj of id.x kh*tnal 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 l,v 2vya ays9-60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer an 9-ylv2aa,s vyd transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 , fdx8w1(bbkn 0ex;ooV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissionoo wbx d,;8 0(1fxnkbe 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 voltnuwvdex9n +*8tgd1hv-eb9)apvk r +3age is usually stepped u*x ekv-v1r3)p dtvnng98+w9eu hbd a+p 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 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.bx z/8f q8ybt ,ag84vw A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is st8/tv f8z4b,8waxg bq yepped 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 li+ apn/ ir4awh1ne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio4ahiw1 r+/ap n 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 lineg xf4o:lpja 61i 9nvghd; 6rx2 at 1000 V. How much less power would be lost if the power were transmitted at 3000 V d:aghx94n 6o2if rj;vx l1p6g 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 generat1 p:xep f j0ozu(te hb3j92j( 4dnc*aeor is 440 V at 20 A. It is to be transmitted on a line with resistance of(njou(p d j91pj eax34eebh0c t: fz*2 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current amt nzvzra1 ,zd, -qz9z2pc2l l;tu82of 5.0 A. How much energy is stored in the coil's m8tlr z,qz2zu npv l1ma-t92,;zdz 2ac agnetic 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 res. e/rz/xw + yw9rxj;xsistor and an 18-H inductor. What is this circz x+r9sxew w //;rjyx.uit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 12).+dmukki1 y5(dlfrc( (c rt n l)pp2u0 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 plac3w .x+flri;j7+tk h5aap7 erred into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the reslew(top gzxm: 2lz 78l,sth;*s)3u :i t *rwzqistance of the lampz(qr:tgumzt*,e8w t2wsz hls:7 p;)3lo*x il?

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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:xidr aufs n;p2 fu:*z7+yft+ supply. What is the peak currenap:+nfftxy *: idru+ f7z;us2t through 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 n*m3dq (ay2f n120-V ac power supply. What is the power dissipated in ty3qa n2(n *dfmhe 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 4 pq/ mo3te,h:pxvw(ya 50-W 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 rgu,x 7n+ oqwu3esistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W repikw*r kf5vmrblh6nwr u02 5g;0o.a;sistor 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 reactanc ae9yw2 g mq90u)ugf+ce of a 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 vxpd)+vvo / rxc6a8i): drj4nof a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanhq , q.3cgb78tzs)/7 gavhntgce?

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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 arl6- txhx)b ;+vf gg: xj.tan5t 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 e/x.btus 9oy(xsz94le(uqw ( when 120 V AC at a frequency of 20 kHz is applied to 9 4(e sy( ux9et(xs./oquz wlbit?

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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-Vvw i yi7q027l /oho7bw, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of 63)nz1r v ayvt.4ztp ea 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 3 ks n)kp* )vl;sp;e49ay/,lmx i gcpzis needed to 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-me2shy4w.t 5 u,*qmrq qF 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 capacip*k4jwq/ 1 mzrtive reactance of a 0.010-mF capacitor be 100 W qz1 kr/4pwm*j?

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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 Ht.wh ;f; zloc5z 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 W a( kgg8)pn 1e vcd+*rwinductiveng8drv +1a* g()pwkc e reactance, 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 resist r 6l;5 1x1cw8fjetcvvor, 20-mH coil, and 1.0-mF capacitc 1 x1w;lj8fvectr 65vor 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-mH coil, d+cyk;udf:-c tcder( o7f*) fand 1.0-mF capacitor are of( ycckrudd;ft*d +-7f: c )econnected 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 vict,lf f5 (-qcawqvg) , xz0hg u7-/qin series with a 20-mH inductor, what is the impedance avv-c 5ggz-,)xqcq0 7w afu,fq(h/lit t 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in seriesfkxcih2s/th.v1 a 0rc02k /+ tc1bzlw with a 20-mH inductor, what is the phase angle at 102 /t1 krtc2vs+iabk w1 h.cc0zfh/l x000 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 ciel90h (kiy b(;ej n v(e6ud9l(xqp3ibrcuit with a 20-mH coil and 1.0-mF capacitor for a total imp(nbel ;i3x(hjvupyq 6k0(e delb(9i9edance 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 reiz1 :ug;ngmg;m0 )ffryyf(3 esistor and 15-mH coil to get a total impe; 3 u:mimerny 1f)gg0 ;z(ygffdance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at-9x*tt2tus r t 5000 Hz for a total imp*9u srt- x2tttedance 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 resistory29z ll42mdv g9 cpe1c at 1.0-MHz for a total immd 2zcy4l9gvc19le2ppedance 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 conneh 1o(y i-.yvd.tk k-lgcted in series with a 20-mF capacitor. What is the impedance at 1000 Hyt.1(v-o kgyld- h.ik z?

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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 qv rjcbxk.)lh f; 9h+-a totarq-lhv xbh 9+k; j).cfl impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-m3xa e.yj)uq +uF capacitor at 1.0 kHz for a phase angle of eqx 3uju.a)y+$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is ne9 .qlmoox- q(,qh,n8tnnkh 7e eded in series with a 30-W resistor at 1.0 kHz for a total impedxtnq-, m( l9k,.hoqn 8eqnoh 7ance 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. Whuuot8cbmczh:d icx .es/; 186at is the phase amd ;8.8ziucebocsx6hc/t 1:ungle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mHg-06 cxn j 9pyz)h/;sq4oc2disgw a8b coil, and 1.0-mF capacitorwdqh20g6;pa 89j -cxycs 4gnz/iobs) 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 20wcupq 46r qqgps 69o100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rmsc60gr2qpou9 w q4p6q s 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 capac+fm;ra-ovm n+ n,9fi qitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cu9-o +naf mn;mr qf+vi,rrent 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 iwzsy6ohlkxhsd4n:;u4; n+ 8 RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to awd+ nz8;is;l k4uh x46y:onhs 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,+la2owzd( ouu6(ruq in series with a 500-W resistor for a phase angle of r26uw z( o+uaodq,lu( $40^{\circ}$ 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)/ jr1xlee( *gzyisv69ehr9k, L = 200-mH, C = 10.0 mF. At what frequencye y/rvi6xzrjk9l) egs9*eh 1( should the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W aqeyak6.i/ r 34;zphqb06sqz resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powe/ab;haqpq4 e .36zs6k ziq 0yrr 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 ACmxc 26wvfle-vo,+ (wi.r lrm+ 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 resistane+mrf :v,smtqv27j +zo;jg)v ce of 30 W. What is the ++ j7f) gmv zveot;j,q2rsvm: power 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 ak8g8zqjwv z9+4coyhtp3,vhjk)8 dggc 5z7 6f series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 64z8j dy8z f kp,gkchvgo5zq+v8jt3 hgw)7 c9 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency oykbwigwpt :7; a;2sh+ f a 1.0-mF capacitor and a 15-mH coil in series? 2hg;;bwst+y7 p: iakw

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a rel0/z)* 2 : aleowlaicg7vo/ kcsonant frequency of 10lc)/ik o*: va e2az/c0gwol7l kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant frequzoz)+w/9kr -7qtdp3btj:rxsb 9jo p w ;wec 5.ezctpop .woz97:s;5 r3q bw-r) eb+x 9jdtk/wjncy 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 dmn v/4t(ksfc555 pdzmust be placed in series with a 30-W resistor and a 40-mH coil i(c/n4 kfdm55p tvz s5df the resonant frequency of the circuit is to be 1000 Hz?

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