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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autodiscover.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autodiscover.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magne t5ieb0c v6p 8bw,cxu5tic 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 inductiow f++s4v5h m9,t,h7r c 4iqg-i lqajfen 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 w (2)qceb) xpcyhat kind of change on the induce (ce2cy p)b)xqd $emf$, 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 ofxnstyv3 y57zm;nq :2 b the magnetic field through a loop of wire produces what kind of change o qmvs :x ;n52yn3bzyt7n 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 y6vmhldmp.-mi 7. sj,loop of wire produces what kind of change on the inducedm m h ly-.,visjd6p.7m $emf$, 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)e1fb /iq6n4zzpgl ,vld 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-bb:a2tpw4 3 3vtx jiq induced current in a conductor will be that which tends to produce which of the f vw:b3xqa42p3jtti- bollowing 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 tableld0ea2hq ilm3a q:0p 8s m67ks. A bar magnet is held above its center with its north polsi0aq 3 :dk7a6qemls0pm8h2le 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 magneteai7t syc//7h7;sg ag9kt 0jm is held above its center with its north pole pointing down, and released. As it approaches the coil, the falk7tg g7ca;im/j7thsae 0s9 y/ling 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 magneti/: 7y o mhs6vgf(vwh/tksad 7;qe -p8ic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense ofivhpo/ e:- k;t/7wmasv 8 gqy6s (d7hf the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vectoxbru-c :mve, pgo56.,gyb vu5r points straight up. The magn v.v5, - bu6gbuo5gmrecpy ,x:etic 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 horizontal table top in a regiond,/ oa7.f ergq,kuf4m where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direcfq74amkf, eudg/ r,.o tion of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a hov1: *+;sun7wq tyfsnc rizontal table and carries an ever-increasing current northward. Two coilsqf1t*ncusny+s7w ; v: 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 ofm+3 ef xel*0,jt)qwgz wire with the north pole entering first. As the north pole entez+ )gtxj ,*qw0mee lf3rs the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angularh +a(*db amoi: speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axi a(b+m: o*aidhs 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 constande:/ a1nm,/qzr7 q zxet angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation i:xqea /e17n rzqdz/m,f 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.t o0dd5 t:jc2.d)tg fh
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that ;kzh tlo4oc)r3 5ts(w 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 m(e ysssmytw2 -bi )qzz()w4; aagnetic 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 (orienterzii.)dc5uuwd v )xx/.0iw :fd in the east-west direction) is moved northward at constant velocity through a mag/z:di5wr 0)w uvi .ui.cdxf)xnetic 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 rotat+y ur0bzeqj 09es at a constant 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 twxo;w1 +bobs -ransforms

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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 revolu7ez) hpyvr,cxsb+)y: hw gy/-tions each second. The frequency of th 7 yrh/gv:wcy ) h-,)bspxy+zee $emf$ 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 used 0ku igat4kj14n ;n:t:qc ln r2to

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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 devicaq k,l8ul+5bx oq.o4ve 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 contaimrdcs 0 8.ywi-u(d+ udns more loops than the primary coil then it isd8s umwydc- d i(.0u+r 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 ;-70jbw1a+pzhbko y pthe primary coil contains more loops than the secondary coil thzo pj0+;k- bpybh1aw7en 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 )fl1s iasyycg9inlr,m- - a25je9s9be 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 resonanu l.e4s *q-rsjmy/3 rct 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 connected in series to an ideal battery rnh+mijem -- 439lwub of constant termina3n4mi lure+wj- bm-h 9l voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of con ifz0c.+fz51b/ 2+jc iijyn jfstant terminal voltage. At the moment contact is made with the battery, the voltagebjf.z/iyj5f0zc i2c n+i j1f + 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 indurcyyr4yqj) mxsjycr9l3 f0;7 9m2p;actance 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 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 and resistance R is co . i)z+yhw r;p-;y* +:zryisvv0zsq xmnnected 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 serio--z9ro6/il;tnte :mfshc7u l)w ,v g-e ow *kes to a battery. The time constant for the circuit 6eknguli 9:-/*wvo -e) w,;o-tozhcs7ftlm rrepresents 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 coyp1,tp+z xk. nnnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the n1yp t .pz+,xkcircuit 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 qvz;lg7-g sd4r e(xki(a30n +7ztuag units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thv 18o9)xqyc xyis 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. ox uy ,/bb4wzckle715eh bkf(-t(1kq In this circuit, the currentk4z (b(wf5ye k t1 uk1q,xlcbeh-/o b7

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the .)5g.n2gmy6ke,gfzn ccvx6 u frequency is triplx.6u2ncgnc ) 6.vg5, ekfzmgyed?

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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, thu9b3yop2 du4rsjol at (hb0w w6ne )*.e inductive reactance of tha jh62na.)0uworos94bbwye* tu(d pl3t 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 o-k6p)du6w jk n ,zcf,the AC voltage across an inductor approaches zero, the inductive reactance-o6du6jnf,pk )c,kz w 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, theo ;clevxyr7 u613cbihe8,o .x current x. ;rlh8bc7o1ex oc6y,3eivu

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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 b3nda.ow2 m i94i :zbpppth 48changes by what factor when the frequency o9:4 8nti4w 2mppab idh.pb3zis 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 )ph byxr0e6)g capacitor approaches zero, the capacitive reactance of thayxg )b0h)6 pert 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 ang6rcke qz+qz r.9ag+ *mle between the voltages of the inductor and capacitor in a RLC z+kqgzr rc69+m*a eq.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 RLC chlm96guq 7 mf4ircuit 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 circuit0 hvyg4 m6l ilb.sdp,5 increases if R increases. When is this statemy5bhvpm,6ldl.0gi4 s ent 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 the circuit increom g5cmy18yrg gem 0(l e1/jvc2i4vp8ases 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 cird+nyuxhd* qazl.j dag ;6* i1-nsc 4e+cuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both douguf7y gwc66c.2 w 0jpyble in an LRC series circuit, the r2jc . ygwfg0c66yu7wp esonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied volxtyd4 )6wcpvr5j5qu( tage. 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 RLCue okwbd5-l+vf xf8z 6 qgd61dmc,n/9 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 radis4y6a;nz t m9gus 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 magnetic field ve9mys;zg an4 t6ctor 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 uniform magneti plz7w r6nw*s8c field of 0.20 T. Find the magnetic flux through*wzw pl s7nr86 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 rotat07qy9ulebm aj7ox 4qyh /-a8e ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiee7-47/ heyj89 yxqaam0qb ulold 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 singlebk - 8*pr9tomp 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 changes from tgyjc fu3. (a08he6 ipu uv9o7$4.0 \times 10^{-5} \; Wb$ 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 c bn0(s9 ) zsvv/ve5wmd .hs4jdm. A uniform magnetic field is applied perpendicular to the plane of the coil.sv5 vsbsn(d0w )/d9h evmz 4j. 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 a(cq.( *vfn 9iu f1rgpprea 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 +qlf6 cc hchf+6,iew1and 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 horizontallbu;2q ;: qppyuy at a location where the downwardp 2p bquu:q;y; 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 that is 2.02fxtap34 i7lb ,ppkz, o(l+ned y j4y/ 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 constant madk4l 4+l3ozafj2x/niy p ,tb7,pep(y gnetic 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 50x)/juhoovajzd mrm9 hvtjz:04h)x-j87 + 3qq loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire0ld)j33q+8p+ +nhdycqej yex 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. z1mj40szync x1bip13 Each loop is 12 cm long and 8 m xjc311izb 0nz py1s4cm 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?

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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 tuc vd2r9 /6qgk8jix 0u 7lqzyioa/ 67kzrns 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 ou q -egp3m)lt8kq6)dgvtput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating gd86g )p-mqlk)qte v3 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 generatb *,m9oeh gbh2or with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The 7-ck2nhy6 2dwd)e 3m-gyg4co d7z fza motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates -qvxf )ot9s e0on 120 V AC, and whf0vt o )xsqe-9en 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 connected to a 24- 2jcv;lcgw f m)k l*4bis*(i(v6+hhmxV power supply. The operating current is 1.0 A. What is the stal**xi f+b civwgv)(2lhh k( m6c;jm4srt-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 resistance5wn* 57omr loa 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spee7wn aro5 l*o5md. 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 connected to a 24-V power supply. rifxe59.lty / The operating currentlr9.i /fexyt 5 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 no7ptvu-gt d;*o0 ye c2eeded 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 transformer causes 14 A to flow ine/ g6 e1;*tpzcic3 lei the secondary. How many turns arei/g1c*c ;i p et63ezel 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 primary if ther0q a0g, x .tcz/de4+y wsvh9b 24-V secondar+0v9es y.qdtbgra4wxhz 0/c, y 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 prijz m d:j.5jhfi9/,3a xv,j;vn 0e9ymkh aaba/mary coil and a 2000-turn secondary coil. If the current in ,3j 5h:/n,a0axkh e/9jia f m ;9v vjjda.ybmzthe 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 tg dw8zut: (r lg)n,zx*ransformer. Assuming 100% efficiency, how many g*t r(:z8 w,ux )ndzlgamps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon si; gx7cw 2 82 qpwa/2zdd:cdghwgn transformer provides 7500 V at 10.0 mA. The primary coil operate:zw2chc/ 7;xp ggqdwd a8d2w 2s on 120 V. 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 tfhs)0 y ypj4w7urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pre p0yjsyh)fw74sent 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 turns on if:8bw z 8xb t2s9w2tuvts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present iwsx 9vtb2 zf8u:2 8twbn 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 hasxx 1*os m*a/ft 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we c*1x */ fxmtoasan expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its se5h pzv2kp: tqm;f yul 5)kq)6pyv 8+kzcondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volta qlu yp62kk 5kpmq)) hv: ;v+t8zz5fpyge 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 twld*dyz(,1+ zxra k u9urns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectxwa klz+u9d, 1y(drz*ing 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 isanobib-bdi: m , fraygy5y2t5y 9r; ,- usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tadf55rryiit- , ;ayg-b bybmon ,9y:2urns 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 voltage is x:y5lww 4 epaixo-.9dusually 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 inyi.-aw:x exo 9lp5 dw4 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 voltago+j7jbd l(6w..j mby se is usually stepped up to 4500 V by y d6s.bj (b7+j.jom lwa 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 resistanc08e*eb8m qgsv pjuw+ :e 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 gw q0*m8p8 sbj v:+ueeup 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 cbfp 6y:4 reuy o4y4e :s*9vxva 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, tvv9sy:4*pcb 6e 4:xfeyu4 oryhe voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W lm q/u9f-m sbf7ine at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instb mfq9/f7 m-suead 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 t6ls ,szcq(fa uh q8j:h-jr o/7ransmitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppeju hhqaz lfr (7c6oqjs,s 8:-/d 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 curre 34wp;apjf p((f,b o wgli18kdnt of 5.0 A. How much energy is stored in the coil'spdwf;b3,agjk4 pfo(i18p lw( magnetic 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 ca -bs3;wm2f scyr) u3yontains a 6.0-W resistor and an 18-H inductor. What is this circuit's tiraywyc ;u-s3s 3 )mfb2me 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 a;9oc-vc)6 vxj anw9ulkn7/v 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 i 5122th v42rt atfwxqms 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 resistance6)sdgquorj f wc-r;zm/ bc+;3 of the lamp fwo/mc- r)bd su;r3cz g6q+;j?

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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 aid)j a2-6u+yov fw-thl:-w6uuall 1ac power supply. What is the peak current through the resistorw)-2 j o:ulwlh1uty-6 6 alifa+ u-dva?

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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 12v1qa lu,/( iy9 l)daub z-3w7,tey kzm0-V ac power supply. What is the power dissipated int 3lm e ivudly-bazz,7,)(9 ay/u1qkw 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-W resistor 4zhiwpw.e9/au0r8gn 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 50-1p vf6yg6 5thpW 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 a 50-W r +w/(op8i wl3 s5cxrmwky +np1esistor 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 a q8f e9 g8w(0ojeqcxc.t 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 coil at6 . jpouyj;hi- 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 i3*qcoy cjk;y6 nductive 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 po8zy( :6 drzlsy;f* gfor 157 W of inductive reactance 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 - 0gbbzx74 tpxat a frequency of 20 kHz is applied to itp7tb0z x-bgx4 ?

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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 Hc* c g;89pxmkyi 4-twyz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHzdu)rniwi( e:,el3y rvf: f34r?

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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 needc l0nnglw ,q 0/e71zyith9bod l 7)sb/ed 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-mF capacitort w igd rtp8(nt/ ,2so+cl72xz 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 reactance of a 0.010-mFk4xavxm g t+d+1/z 0m uaubo-x*gtk07 capacitor be 100 Wxbgm*0/ 7d uak t+ox1xz0vm+ kag4u -t?

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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 capacit s-ev;-/w2 inndwq/la or 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 o+ em)4dzcg ;e12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivedeg) 4ec; om+z reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, anzpj/n;q5 hj u. ou9rz4qu5eo2a6d.ldd 1.0-mF capacitor are connected d5.auelou; /n6zr. 459upjqhq oz2j din series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.ha)--x ofte t r8ap7u50-mF capacitor are conntf7ha-8at -x up5 o)erected 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 inductor, wha8u y ih,(ar u.nd;yqz(t is the impedance (d; u.qy,ry ahz8(iunat 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 connecteli -4 ,(naoc:sg7raes d in series with a 20-mH inductor, what is the phase angle at 1000 Hg sose7(na-r cli4, :az?

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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 circua3odck u5wh2g:0 lsbkm*g.t2it with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 2bu. 0tc5ls2ggoak:w*hd m3k1500 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 resistor8gz3 n3(tw9*mh sp1lmb1sve j and 15-mH coil to get a total33* nts 81 l(hgz9vpbm se1jwm 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 a 450-mH inductor atmld h,,7t +/hahhqa*b 5000 Hz for a total impedance of 400ba*7/ml hh,qa h hd,+t00 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 10h3pe s /b3qbx*0-kW resistor at 1.0-MHz for a tota xbsqh e3p*3b/l impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a xnhwz rrdng1r*w:5v/ l;7te-20-mF capacitor. What is the impedance at 1w1r /:n5-ed7 n x;gtwvzrlh *r000 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 wq 64fhp t)bcqr)gfg1 /oe, 0uzith a 10-mF capacitor at 1.0 kHz for a total impedance of 45 q6))4,pqg c0f1/fregbtzo hu 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 capacinbczrwr(v l3n +9f,h(,pwe* btor at 1.0 kHz for a phase angle of w pn3lwc+r(be9v(,fnrz,b* h$40^{\circ}$?

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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 qp s5b s1)aa1fin series with a 30-W resistor at 1.0 kHz for a total impedance of1 asb5pf1 )qas 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-tv (ek5lr:4 t ln.gj0imF capacitor at 120 Hz. What is the phasr4v el0t :n5gkjl( ti.e 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, 20-mH coiiab(3ia+j0 fdc( cy 6nw+ei*sd p07on l, and 1.0-mF ibc6s a(wi+0j *7 ec+dnndyif 3a(op0capacitor 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, andf 28( iac/zmtln7 m:.wvwi(cg a 0.350-H inductor. The circuiti.zavcw ft nm2wcgi l7m8(: (/ 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 9jlh6p hv+gm 7wugr6 l8 e.-aycapacitor 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 currh8vmgl6 +7a- wlhp6j 9ye urg.ent 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 v5l 4vk9sue+6o;ufoo RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power su vo6 u;4oo9f vk5slue+pply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a pfv(wwjxvdl,gx +u,) l -(gn-rhase angle oxgr,, ww(lv)f+d n--v lxu gj(f $40^{\circ}$ 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 z+ray r:/d zn3o hp;d(= 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dr/n:3 zrydz; rpah( +doiving 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 seriesp6y n pl6*.gku:nbyc;u hd :l4d+yv1r on*g1m circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecte.kpp; *1mu:vy*hndy 4o:ycnr1g 6 dnu6+lblgd to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cirvspitlc d31 5yb r7pv:5o3kf( juwb0 i*ib,1z cuit 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 17upkb1nnxb ( and a resistance of 30 W. What is the power facto( b1bx1 nnk7upr?

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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 circuiv1hzlmw: /(3 f pkq) gu0dgh3et containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-3f g3e01v(g w ukm)p:hzh/qldHz 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 coi5tjm0 g 0udkrga49v, fl in series?grv mft0ua9jkg5 ,d04

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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 t0yyf y4 io.( / qova.wc/vky/capacitor for a resonant frequency q fv/oyk.i0/o/ (ay yw4 .vtycof 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 lnoyy ,w +ohurrkm25oza 59+:-mH inductor for a resonant frequency of 1000 : ,u oaomh5o9 k+lwzny+5yrr2Hz?

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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 resistoa0v tzc- 2s fbwh;ri.7;3wzbi r and a 40-mH coil if the resonant frequency of hrwiia7 ;t-3 zsz;.2v wcbf b0the circuit is to be 1000 Hz?

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