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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excvj1vnp a xn9g*xy+2 2cept

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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 th4 )5em-xtmby bz:cupr ,2 )srrat 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 loopsx q7w)yw;b bc:-og gu1q*bi)m of wire in a coil produces what kind of change on th * wcq71-qm)o;)ibbgwx: gb yue induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of ozvk6qpyxz8xg 3y)1ra/g1 e; +(eqihwire produces what kikx6pgx)3+rvg azeoq18(yqh;ye/i 1znd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what 7,3 ibm-vn* m7yqfo4bskhq w 8kind of change on the induc s wbm*k4-vo8h f3,qbq7im ny7ed $emf$, 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 fief7s 0l s, qf5mfhe4fe3jw59t ild 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 d:gzro7 rft. ud.(ld/iirection of an induced current in a conductor will be that which tends to produce which of the following effects:dz gu ( ir7olt..rdf/?

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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. 7ez 6 -9nq . ndl*qqd4xmyjur( A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces6 n qzqyq4*xl-nd7 ejd9ru( .m (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is helc::c 3pqq,ne1f t.am4 djbo0g d above its centegj:coatf1e,m.03 c:4 nbqpq dr with its north pole pointing down, and released. 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 region where the magnetic field vector poiv: tj j,0lug8kp t1ud9nts lvu ut09dj,p 81t: kgjstraight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a :9hxe :aw4bq udy,q 5.kz1x3tmo .vxlregion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewedmqek x15xoz ql4xwday3 bh,u .9t :v.: 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 whe s/; e7-18yqyrpim0-xq ci ygos:l)sjre the magnetic field points straight down. The magnetic field disappears suddenly. Wrp1;sxlsgyq0iy y eoq -j) c8s/:7-imhen viewed from above, what is the direction 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 a9wmyn;0 ej wzo q5 xaky ac,tr2)*bc(9 horizontal table and carries an ever-increasing current northward. Two co y x(9 ckjw2tm*r0 ow,;5bzayn9ac)q eils 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 of wire with the north pole entering fa. jbg5wbg)syk+g/,girst. As the north pole enters the wire, the induced current will be 5+j/gg. bggsyabk) ,w (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 speed about an axis whosr;:ibav*a,v d6 wf zo3e 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 ofrv, z wf:;ov biad*3a6 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 wi5d 6wec(lmgz5 9 ujta*7u 8qtnre is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the q7(6nguj tzed5a58mtl9w *c u 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.iy b:4:ca(hbq.w )sxd
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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 t-op lex. .q;ydg,tjhj/d g e8(yha0h- hat 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 m0/wtli-l1ngg uy2tzb 4 d*+lgagnetic 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 dix2d1f,bbx j.q4va8 zirection) is moved northward at constant velocity through a magnetic field that points straight down. Majv2qf abx b.iz 4x8,d1ke 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 ao ivqt/gc/99dt 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 transforvg4- ncwz67ca ms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates th9ezh98md id) mrough 60 revolutions each second. The frequency of the zd9 m)9m ied8h$emf$ 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 usq5xa,) m k :mmlil -6eaiyij9;ed 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 devic. xodlz89*jat(+ stv x+ybo0j e 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 mmu4b guk2bu-1gcch1u9; fx 31uurm; secondary coil contains more loops than the primary coil then it gxcmg1-uum;f12h3 ;bmrcku 19buu4 u 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 0h1h7r.l/w.az zir tl8y4a;w qb*rjbcoil contains more loops than the secondary coil t8a w 1.ajy0rlq .rbzzi7 rh bhwlt/4*;hen 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, theqy aan5qp-o z1i::on6 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,w9:9,u )uqept0 z6qq)ugpvga

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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 g bx( ttxuwqe s5-6qc exb:0,+connected in series to an ideal battery of constant terminal voltage. At the mgtu+ tbe5 q6s0w(-,eqx xcb:x oment 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 ohb 2yr1avs 2-m uvd85vs2.b qff constant terminal voltage. At the moment contact is made with the battery, th . sq2r vvub2-8sybdavf1hm52e 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 connectettc;2ufyl z;5d 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 so36f y(nn4fv-gnjf gy3 5rk)and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery.mh:*q h wnvv16l st1w.2skf;w The time constant for the circuit represents the time required for the current to reach;m:kl6vtsv11whq w fw2n*hs.

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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 i : )p2ucza-shfm vphfw61.l g4n series to a battery. The battery is suddenly removed from the circuit. The time consta ha46-2v:uhlwcf z p.g)sf1pmnt 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 sam3cgzjyjw 4.4*nex4:b0m gfq fe 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 Ajr -odtu65 irhhsh;293b nn r6C power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuib.18zdgd5ib 0gnyw k 2g/* skntca8p3t, the currenttyz/ akw* 8sdg 3 051b knc2diggn.pb8

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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 factuaq51 8gpl re4or when the frequency is tri154rpaeqlu8 g pled?

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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 inductivetk *m- aq2ka4uuoavb (l2) 7dv reactance of that induavq u7dv u4-m bat*l o2ak)k2(ctor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches ze4/ (.hnmy m 4)yq4ch-uak bnavro, the inductive reactance of that coil(ca h4/bhnvyq my4.km4 )nau-

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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 tf cc dyngj-u 5ddil ;9)t 5/p5fyw*(aeo an AC power supply. In this circuit, the currentg f9 cd / u;(d*i5we5tfdcnalpyj5-y)

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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 change,zy vsrb 6ac98f 5lzy91l9enos by what factor when the frequency is tripledzlly81ye 5 6of,9c9arzvs9 bn?

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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+ bawyv7x ;)7kqe tje+ zero, the capacyvjke7);7+tbqe+ wax itive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betir*yn28mx3td ween the voltages of the inductor and capacitor in a RLC sd n32i8yt*rm xeries 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 circuie w8cc fo48jo+t 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 circuitzpu n ok,k6-d: increases if R increases. When is 6d-nz,:oupk k 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 impedance of the gqwg+4pqb+ c0 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 incr3y-.bk cijfq97vaa j,eases 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 andc( farfz9l+c 3d5uc2q the capacitance both double in an LRC series circuit, the resonant freqzafu lccd (2f5 39+qcruency 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 iw,e 5fnieb r8hnh:2q j 1s+p5yq2e*v AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit ,wbs2ax. hy c/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 fieldoxhk 9 6:s0ipi of 0.20 T. Find the m9 hs6oipk0ix :agnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rh 8j:pc:. g2kar4jp uor.8w wbotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop an j a uw2or:hr:j.wbp8k8 gp4.cd 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 field ov :irly hg4 x.c3yf)5zf 0.20 T. Find the magnetic flux through the loop g4vhizy3.) yxrf5l c: when the 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 adjusto2e8-p,qg* s kard 9edable 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 coix 1zkyk b7l6w.l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. Af/ ym jg8pza8: uniform magnetic field is applied perpendicular to the plane /:azpm88fgjy of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns anvcg. r.x9f82hdn)ormhocf( 8 d 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 area xay3u(w-q:kn*g.hbgmdn+ 44fjo jd * $0.20 \; m^{2}$ 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 spdx(kr;lx(/g q an of 60 m flies horizontally at a location where the downward component of the Earth's magnetic fiel(rxd;g/xkl ( qd 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 lonmqd3crmxu*te- n eq;;:9o0z r g rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throughc0und* eemtmx3 zqq :;-o9rr; one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a ce gqp5v5bk :,nross-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 tu.oa)6) qy)ijxvh c2k9p3ra oa rns 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. Each loop is 12 cm lo kv :nw;hq4r j2 /y.h9qj-qftvb;hy p1ng 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:2-j; fw hr4qq 9yvqkp/bhvt ;yj .n1h, 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 ou:lpe y/y(0jdf 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 of 12 Vk0;:mu4pipm z maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotati :iupkpz;mm 40ng 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 m-2casmv3c6xu2-0v oxlptn u4 aximum $emf$ 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 motor o 5q cqf zszl7q))f1.u.a2ev sur+p.glke8 / gyperates 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 h0st) gtn7zl:mave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gnm70 st)tlz :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 c.pj-mh oi0- +o3ymu dgonnected to a 24-V power supply. The operating current is 1.g-.3d0 poumyh- o j+mi0 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 connected to a jh(,w8der yluqx+5e -1ws: wp24-V power supply. Thhxujy+-eew1p5 d 8:r lws q,(we operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistan0x,i u 8ic08xyos4tzwf ( k4q19e ypazce 6.0 W is connected to a 24-V power supply. The operating curyxau, x8ts0 y 1k9ez o8ficwz0i4p(4qrent 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 a pxw620ky2k, 2)xjhkmxw.mnv r rimary 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 theg,xw gisaw 45j7l/4 ri seconda iar5w7 ij4,ws /lx4ggry. How 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 necessary in a 110-V primary if the or48fbff/ c x(/8o: kfrthjz)24-V secondxr 8f/k)j8b4fo:/f(trofh cz ary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondy 1fgaaqh 54xrpe*v8rp s3-db29 c0yfary coil. If the current in the sh0a8rg1e3ya 2 pb-d v* y4qpffxc59srecondary 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 transfoad1r8rds6l v3k27ptx rmer. Assuming 100% efficiency, how many amps at l6xrpva2r8kd7t1d 3s24 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 og )2x5k:-pg9+/pkig dsn k ,quy+oi ucf a neon sign transformer provides 7500 V at 10.0 mA. The pris2,g-/y 5u)kqnx++k9i ug dk:gpp oi cmary coil operates 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 turns on its primary coil f-d+ xh m:6pxland 300 turns on its secondary coil. If 1phx-fld6: +mx 20 V at 2.0 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 and*o2,db;bewen vtjz-ji l/ b+9 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prim - e2eiw o9bjdvnt+ ;z*l,bj/bary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turne30 ppz*i 4ckxstbbsq4/14)g3 f4znbk6 evers and its secondary has 200 turns. If the*nv4p kbebeszip 1q bfxks 34 44erc)gzt 3/60 input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itripqtr851e b3dd 3.x zs secondary has 200 turns. If the input voltage to the primary is 100 V, we can expeczrd i3 3dpex51. trqb8t the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer 5sg t5.j 9qlvx1wm r3yhas 100 turns and its secondary has 200 turns. If the power input to the primarj vlyrqs.559tgm w13 xy 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 Vudzbn4yq*rqhh+);, r . 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 number of turns in z4n ) *by uh;r,hrq+dqthe 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 a ez:rn4: 3 2yigpxu)u9lz02 pwia 2mrgt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.lpui:u)2 r g2imr :y43p9nex2g z0zaw0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped)t 7cx 7rq.z9xaia ff5 up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not sfx.5xi97 rzaa7f t) cqtepped 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 li,i77zw) ccxib 8 2 igk/oo3viine 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 ratio of 100:1. Whv/ii3)x,iczo 28c ioikb7w 7 gat 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 hasj5lvl9d1ap765e5j s p qdoou 4 a total resistance of 0.60 W. A generator produces 100 V atdlpjdjqs5e9 uv5 7p 6o4oa l51 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 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 line at 1000 V4 v /v3*-oj)ecxedlt v. How much less power would be lost if the power were traj*)dc4l vvee/t-xov3 nsmitted 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 transmitted on a lioni vv s)-;4u;f6r rq;udd2ea ne with rei q4 ;;ev;)nov - sruf2d6raudsistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to 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 energy is stored ine/upa6 d8 *dtnu0lt3r the coil's nurda*lp t6u8td /30emagnetic 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 d: 8rd nirdggp97u0 lvy.wp 9kw p2s90contains a 6.0-W resistor and an 18-H inductor. What is this circui.w9rpir:0ldp2gn u 0879ywk gs9vd pd t'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 tl8rp h7whjy 2;zq cnos 8ob/-9he rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the m +(oa1pp13d1n9qrvb8p7u7f,fy d ry pszw; ypeak 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 resistance omky mo70*g9 cnf the lam*nk 9gyc0mm o7p?

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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 t4df(k 9ys4gt,k byb(120-V ac power supply. What is the peak current through the resisb bkf4tg4yd(s,t9 yk (tor?

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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 powk,it z7h l2e :z)tycb:er dissipatet , z)cb7ti2:y:e zkhld in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is t t5l5*wpjq,s $I = 0.80 \sin (240 t)$. 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 resisto*)1n4g v vrxrhr 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 resistor u zyuc;- +z n vf(+qvtukw: x,u6y/-ciis $I = 0.80 \sin (240 t)$. 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 1u.xmfu4e-:n8 crg(7e99q j yaxq .e fl.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 hx a ;ewmykw,6/q 2,bpreactance of 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 inegt-nmz,4 ryq)5 x:reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of qu9em(t0 g4 lpinductive 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 mv.6 ky-hrqg .when 120 V AC at a frequency of 20 kHz is apqh ykr .-mg6v.plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz so(u)is(9 rf qxiurce?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitigw75d3e(m47yn.f )se 4l hf+ ies blusve reactance 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 ok*ig4mzztp6 50 3 bqee6k1 csneeded 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 capacitor have a r :+j/yfvmy :ooeactance 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 0.01,p/kx wob) g5oz vkd(70-mF capacitor be 100 W?wo kzpv,/dx7 ok5gb)(

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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 0.001:e 7o0oo81+t0icfwls2irhqp 0-mF capacitor 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 ser ,90gik.ccsdz ies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancc.,9sidk0 g cze?

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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 r(2293 9vsgxxdsbnz ny esistor, 20-mH coil, and 1.0-mF capacitor are connected in series?9vd 2 ns3xxz9ybs(n g2

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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 resistbj1b/)xzq 3t hor, 20-mH coil, and 1.0-mF capacitor arejhbbq /x1 z3)t connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whatkb3/ mczt6 bf4 l/en,,lq9qaf is the impedance at 1000 Hz?ntb4 /bqmlqzc9e,f/f 3 l,6ka

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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 connecte/9vb( af7/fa t pm r iti;yb9kgk(0z8bd in series with a 20-mH inductor, what is the ph7 bgvpy9b/i 0zifa; tk tf9k(ra(m8/base angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circ4waod7zt rhp 7zsq*h7(qpb2 0uit with a 20-mH coil and 1.0-mF capacitor for a total impedadpq7hh(*tsrq paz0z2wb4o 77 nce 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 resistou*dlbg04)ks 7h7 cqr6 mx3hyar and 15-mH coil to get a total impedance of 110 W 7kdh3m) *ug6hra74bcqlyxs 0 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 i dgtp/q eqck0 y.5b-l(n series with a 450-mH inductor at 5000 Hz for a total impedance of 4000qt( g. q05beckdylp-/0 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz forlbar 5x57e czzl/ie- r v3y+v7 a total impedance of 7lv-zbx/l3cvzi + yar e75er5150 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. ,3gn *a/m;vb t/x8q+* :b/lvp in:pjcbbyndd What is the impedance at 1000bd n q*tp b/xi, p/bd8 g3:v/l:njmny *cvb+a; 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* r1m 2 k:slkt;akah1j a 10-mF capacitor at 1.0 kHz for a total impedanc2; aa:m k1kstlrk1jh *e 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 41w-q 5zlj7qj tp s3l u;wjor4in series with a 10-mF capacitor at 1.0 kHz for a phase angwowt4j s3qjulrqpz 57j;- l1 4le of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in v , ug4e ;+fk8ohh3msmseries with a 30-W resistor at 1.0 kHz for a total impedancv;uf4 , mkhes8mo+ h3ge 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 in6. jm8mvz m;zjx nh0a8xj0 zc) series with a 100-mF capacitor at 120 Hz. What is the phase angl vzxx8nz jjajhmm)0mc8 6.z;0e?

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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 ifj 9v5dwty*(ygnh8p6q;jnw 1c a 100-W resistor, 20-mH coil, and 1.0-mF capjyj d1n hgnv*wc; 6 5tpqwy(89acitor 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 1009g2ej5 ayu*ns prx. qb,//bb z-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circ .ujas5g*z/y pbqne bx/,2rb9uit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and aylzqa n-eaql4. 6f*m1y/ 5yqon inductor of inductive reactance 30 W are connected in series to aqf -15 zlo. q6m4aaq/yneyy* l 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-( ylu.uz gyf5d3c6t b2s a9y2lW resistor, a 10-mF capacitor, and a 0.45-H inductor, when g(9duf5la bt2 ycuzsy .62l y3connected 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-W r(6w2d. sz4r g ;rqk3hzepng3wesistor for a phase angle o wq(3 rzz.gs rdeh;nkp26w4g3f $40^{\circ}$ 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 dod2vr xw4hc6um9a7pngr:f w.jg 9+ 7-mH, C = 10.0 mF. At what frequency should the circ7n 4mdgdvxo +prw: wafgr h9.279c6j uuit 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 cfh-g pp-l,)kpuw7s5 t4ynb/ series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivepfy7sh p-lgb- k4 /pc)n,5u tw reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an Assn+03 l:awja C 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 circuitqmrh4)csr skzx6q b m18:h,;-gls ps / has an impedance of 60 W and a resistance of 30 W. What is the po h 8p:m6sslgqs )r-;szchk 4qmbr x/,1wer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rm wrc8kovv3w.g )t 49uesistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow)4cvwt8 r vm wgk3.9ouer 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 coil3pawn9 mnars5hv7f48ii i9 .e in series? avfpi7 rn .95e48nwhai3m s9i

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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 sjkt9 9 7yodj10 l4svpsbh0k1for a resonant frequency vh4pjtosbk 07110s jly9 ds9k of 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 for a resonf j;ghv+ k;z8qant frequenc;g8; hvjq +fkzy 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 40cve0te q r 2h1fk-/1cg-mH coil if the rese2tq-c/k 0g1c1herf vonant frequency of the circuit is to be 1000 Hz?

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