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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: 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 magnetzu5ey98ss n+.m wi /,gmhy3 bgic 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 the doe g:3k,.+n;uz tkr z$emf$ 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 produ -n1ue46;jq bw.n stapces what kind of change on the induceq-1e4t.a wj; nubs np6d $emf$, 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 throlej vguq9( (wh0: ps+xugh a loop of wire produces what kind of vj( +glsephw:u9x(0qchange 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 of che,psvvj+ 0t;;wab rc9ange on the induce+be0t ;wpr j,c s;avv9d $emf$, 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 majf:g6pi0),v +e lgwdlt2awn 1gnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current vt/*3o - cgvajkf1ni6 in a conductor will be that which tends to produce which ogc6v*va ifj-nt 1o/k3f 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 barv apl+gipd1 -uq zx1,- magnet is held above its center with its north pole pointing down. The stationary magnet induces x1 pvgz+1uq-l-,dp ai(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 y( u8t5dj 1 uo-r o 0caab;mjl5;uyyh9p5b2 rzhorizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it appro l 5oud t1 ( uzbuyya;cr5h;-rp0 9ja2o8b5myjaches 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 vd d6oh55pkim2ector points straight up. The magnetic field vanishes suddenlyki6 o 5p5hmdd2. 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 region where the magn32/khpuk*ne) h x k,xqetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directionxh)x,u2ekp k/* 3nq hk of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magbq i-+t1ddg i hxf j.4ujr3s mqi)5-f1netic field points straight down. The magnetic field disappears suddenly. When viewed from above, whdxbs 3 -)if if tg4h1r-im+qu1q d.jj5at 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 a horizontarat6o y.w +o6q lgk0juqq(;x .l table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on wjt0 r. oqlxoaq.6k guq(6y+ ;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 loo:ob*pzo4 s;sqp of wire with the north pole entering first. As the north pole enters the wire, thes o;*op4sbzq : 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 angular sp37zcs,im *u opeed 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 if the*p sz,moi3 7uc 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 ro(1* y1tx3zgr17snw nfmd mjl1tated 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 loop's axis of rotation if the induced *tmsfjxzr wnnl37 11y11mdg ($emf$ 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.1:1 bjex kl g3(cvk0nl
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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 ana 27 dxyxv.8u:j;qph6q f un5x $emf$ 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 field. The;+ywnb9i u)txh rj9s9 $emf$ 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 directi sp9,,wq 3wy4physnt 7on) is moved northward at constant velocity through a magnetic fieldp7,s9swpy3ty4, w hnq 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 bo)uz4o6am b+c/-t y ea 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 generatornw eqjaf+z;4 * transforms

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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 thrhcc 1jmq l;aitt-hvl pa9,, 0*ough 60 revolutions each second. The frequency of the - l,i0h;, vacqcj 9hmt1t*lpa$emf$ 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 t0ih :)7ss(rixmoywfqg*k a/2tm u *2co

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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/c3cth0ai h9h0ht *nie 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 se4 vaf3bdh4 zx4a9-sxaw sm s4 dev.f8kbh2q11condary coil contains more loops than the primary coif9qbsxw.ksm2e4 v 1aafd h-44d 3z1a8vhxs 4b l 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 contaiks19jy7aw4mcu) 2t qs ns more loops than the secondary coil then i j4c9tuask7qw2 sy )1mt is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inh32/gw:jbr06cp l if-ur jnz *put

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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,swzgumytwhoyi; *8l/-pa13 ,

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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 uaj 3kbhpk1eul(/ xk p+qz1.52eg9i san ideal battery of constant terminal voltage. At the moment contact is made with the battery, th/h 5eukb1sl(9 zapj g1i ue32k .xqk+pe 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 idee(2b;zy auav rt+2 od;al battery of constant terminal voltage. At the moment contact is made with the battery, the voltab+ do az ey(tvrua;2;2ge 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 wite)g2jrdazm2 cok-rvz2b ;lc1;(f:ns h inductance 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 resioy k;og ba37nitw+i):stance 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 bat+ejuquj;(: clecwk c77l6 z3ptery. The time constant for the circuit represents the time required for the :7jcc (7pkw+llecu;z e36q ju current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The g pyapl+ 8z4 03cx9 5tsjgv(osbattery is suddenly removed from the circ5p0(j34 gy 8os 9sx tzcapl+gvuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have r 8r7 xgh7j kv(lhfue8 ehu.81otp 25m8yy*g ythe same 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 this circuit, the of)9o :lr +oopc)6p zvcurrent

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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 circu3mar2ok i.45n3 lx bglss b.-dmm3r;vcq;- gdit, the currentr-s. ;23l ik.xbd54a3 gl3bv d-n; goqsrmm mc

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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 changesc,d6qc3bt(h jhy,x2 v by what factor when the frequency h6b(3 hj,cx,v2 ycqdtis 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 inductive2d dse6zffq+(p b et bo9:fb.; reactance of.:+bf ;2(b zeqpo69dfbs et fd that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor app zydgc*v m6g(*roaches zero, the inductive cyv(zg *d6gm* reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply.pb8w19g jv yfvu.f7/z In this circuit, the current9j 8v.gfpy/u1bvfz7w

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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 zutcwbi- nr4j0efet7)r 2h) s1 x. 5llchanges by what factor when the frequency is tlt4i 2j.lr h estn)7e0w z)-ux 51cbfrripled?

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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 volte0 7phxlx7:phkjiu+p t*i+v-age across a capacitor approaches zero, the capacitive reactance of that capacitor7xe+ xpkuj :0*v -7+hihtippl

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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 betqx6m g(j -; bpgrk7uzwmx0/f1ween the voltages of the inductor and capacitor in a RLC series0m r(u;k1 xpgfbxw7zqmg /6j- 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 circuit is teynu t/ d-: )6xh -kedmzscuy2w:-sg h2gw,, 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 increases if R increases. tditj +o)xmqh .91w7e When is tqj x om9it7htd) 1.+wehis 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. Thz/ -ywko,xzt ;2 jrb2r*1 ocgde impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit*,ahee h5p+rh 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 double injuq(n,cmg+h53o-qy t a8l8oo an LRC series circuit, the resonant fr -qqoc(+myg3 a8jtounol h,5 8equency 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 gj7y /o3jh:utb:(gfhx(y ev 1is driven by an 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 occurs wgwj93 mpte 1diqb.*g6 hen

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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 rot1hnnua59(h(+ q-v6eh:q juxilk wm 4cating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti5a6u v-uqeqjhk4:m lih n+(h1n9xw c(c 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 rad /fkwwsv;bz3et2nk8w.quqy* f5l) /yius 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 fie f/w fw5l 3s*qt)bku/v8q.2zn;yye wk ld 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 q3i) fzl,q/aa0pqj /b)hs h wxkq5q21 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 magnet/whip/q2h3 a)f,z1ql j 0q)aqx 5k bsqic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fr2arpb63q2vavw jq/d; om $1.0 \; m^{2}$ 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 coil3duxl2lzj-o g: 0qi . ,k7vh.a cznxx3 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 njch*sa,e( m h fz-, 8 y2z2zdidg3n-w18 cm. A uniform magnetic fielszyhd-wn* 2mdza,2 (z ,e 3ijhg8n-fc d is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an areyf9m 8gyqe019s xkaj -a 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 anwjj o5*:c*u9q 26vz0:fs lq*oqwkqksd 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 60day w7+pty m59 m flies horizontally at a location where the downward cty+wy9d 5 ap7momponent 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 rotates at a constant angulo/-s wnih/ e5nar velocity of 2.0 rad/s about a vertical axis through one /soeiwn5- h/n of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional t8 tg(o7wfq6rvt* 4d1q p 7gfiarea 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 wire of are: i hoti14uxc,a $0.090 \; m^{2}$ 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 18 )rs0yvmv62g gwvnb5 2 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magneticvg vbm68)2g5snw0vry 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 consists5n. n(8bqyy g beoviz9 (ti2o7 of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simpl. nfsy*:2yvumrt7*)8 o +ghwg xiij+ xe AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil 7 .+ +xir g8jiw2oynfxu:ths)v*m*g y 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 generatocnxgr j w:,93br 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 m051hvq jlpnkc h;7km6 otor 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 operataqyng)lb95 k9 es on 120 V AC, and when running at ful ynkag)qb599 ll 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 resd8.vj (+w( 7oj hnbffhistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. W o njbdv7h8+whj.f( f(hat 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 8ouc) f7hh*uz resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at f8huouz7 f c*)hull 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 resist mr*n2ht;ms/wb / *j ;jwf+xwoance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is t;mbw;/h*2wmjo*n jr w+/x sfthe 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 needa) a6uoe i-d 4noyb5t)ed 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 cpw f/xpn47 shx0u k7c9auses 14 A to flow in the secondary. How manys9hx7/ xkp0 wc7up4fn 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 priw4ddb5 ahl64gx 1o1qtmary if the 24-V secondar5 4 o6h db11xwdlatq4gy 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 ane ruw 7ydt2/n*dthx6/ d a 2000-turn secondary coil. If the current in the secondary is 3.t d2/x*67tueynwr dh /0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumieeldds8(m q )dtd:o),ng 100% efficiency, how many amps at 24 V can flow in the secondaryqd8oles)mdet , (d d):?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. u zkhq5wy)d-no 56*zdThe primary coil operates on 120 V. Whaz)du55n*dw -6 zqhyk ot 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 and 5gr1+ czidzl)zf/lv)rl18x irw *a4t300 turns on its secondary coil. If 120 V at 2.0 A is applied to thet1lgz/8r vr l+d1 )w l4xi*zfzra)ic5 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 6nt* d)ba ukf/90 turns on its primary coil and 300 turns on its secondary coil. If 120 V at t/)a9fbk ud *n2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnso8p:e3 ohb2ys . If the input current at the primary is 100 A, we can expect the output current at the secondary toy :ho 2esp38ob 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 secondb x41rmmk jkqsn3h ;/.g01yjpary has 200 turns. If the input voltage to the .ykhr3pqj1 j0;m/mk4 1 bx nsgprimary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sb8. uwpvp3 3oiecondary has 200 turns. If the power input to the 3pw3pb8vu oi.primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u a oit.i:nd vrit+60. 0 z-xz k-zdw9b1e*dkxpp to 4500 V by a transformer and transmitted through a power lxntvrda.:+ di -6 01i9.e*i dztw-pbko zx0zkine 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 V. The voltage is usually ste4d -h 69mf-hcjd5evdff3 ic*ypped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the d*3-ei dhh5m fj-6c fy4vd 9fcpercentage 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 6 x6ul af:mj6qqt 1 dzg2qj3i*current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisml *dzjaq626 tq3x6jf1qg i u:tance 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 l: bed+ba)5g-.sprrtu l(+ce vong 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+b-+.l:br5rau gvt d(e pcs)e, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60:xvrnh-9w ra /1wnu7w 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 wiuh-an9vx7/ 1wrw nwr:th 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 aekhsdl 7t i8)6t 1000 V. How much less power would be lost if the power were th) 68det li7ksransmitted 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 i (e.jh no,k: 5mwi7eu20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010uio,m j(neike h w5:7.% 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. Howy hxk.k / uy6;ugp-7 xoi-je:hhiv l4r *7ad0g much energy is stored in the coilhak;igpl6.j 7y k -*-eydr:h gu vxxu/oih047's 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 contains a 6.0-W resistor and an 18-H inductor. What irqb4*c3iaa ay 5 ky3efx8:br 9s this circuit'a a8e qirrfk3a : 5b3b*4x9cyys 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 circusa*:cwad/y6yju.uy5 it where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outle)/ ff0 , ska.jfw,7vq/ km73prteo7 ydpyw6ebt. 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 i fps s:c.c0pw5s the resistance of the lam :c5pss 0pcw.fp?

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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 cyu:qh)ciz ,b/onnected to a 120-V ac power supply. What is the peak current throbi: y)q/h,zuc ugh 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 xi.iwk p6nt1g (hch *3gd. +qdq a0y8o120-V ac power supply. What is the power dissipated in to n h+x( idaq8d y*6 pk0c13ihw.tgg.qhe 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-W9ip28+izr ig-4gs s if resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isqbj)qt +vwg+8o o q;m+ $I = 0.80 \sin (240 t)$. 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 w1yq.et qx3zwi 7m*ukzhr; 64 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 avkls1w*2co c* 8equ+d 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 coin 9z*. u4c8iil,8pv.zjly jdal 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 coil8 //ftj xewg e(+u- rexpkb38l have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hz?dom.e4 fmd0x ud3/i /z

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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 1,h0yoe cv8r*b20 V AC at a frequency of 20 kHz is applied vc, oeryb0 *8hto 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 Hfqqr7 ayyw9boa +zt4n/+(/s s z 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 ata1w tozx:l7i /d- cl+e 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 5058ay p c4skbv4,-ge*fhq.ilf 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-mFw aa7:sb v9mrsa;kup4n 1j(t2 capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacbhm8:.1ja, xc yvcnl*db-;q citor be 100 W?n q;dja*bh1 v ,mc clx-ycb.:8

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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.gg.sp*ko5 x9q0010-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 se z42iuybimlgb/-8g w d)u 95elries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reu8i-) wgb e yzb 5ld4i/29mlguactance?

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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 imq/yg(gnsobfi ) :3q d(pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?y ( o/gfdsn(qgb:qi )3

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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 1.0 *vz lbua -x(xi0y(euq j.eq,0-mF capa ilqu0-zbexuaj .e x0vq*((y,citor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor ixf it7.g 3rxc3s connected in series with a 20-mH inductor, what is the impedance at 100t.r g3x3cx if70 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 series with a 20-mH inductor, what is t. jcere l+t)s6he phase angle at 10jl re +t.6e)sc00 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 neede q+ 7s dr;tr v14gyp45dzz9jnvd in a series circuit with a 20-mH coil and 1.0-mF capacitzvtnygrrzj dp+d5v; 4 q79 14sor for a total impedance 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 rekzfdgpjx k30(i0(((-g txcz fsistor and 15-mH coil to get a total impedance of (0iftz g0p c(jx3(zk-d fkx(g110 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 inductob . kg 3n6eepwc/8c-bx 3b(imlr at 5000 Hz for a total impedance of 403meb3 ( x6e/cb8pgk.l bc-nw i000 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 wa98ozd ri0u0 nn1osd/ gp5z-as /x:tvith a 100-kW resistor at 1.0-MHz for a total impedance of 150 n 8s0toau/ 1nvpd 5ia-drx9ogz/s:z0kW?

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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 zbp q8s0l,-l og9ts 9lwith a 20-mF capacitor. What is the impedance a- qp0otls9 llzgs,9 b8t 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacit5lhcr z p0x+0vor at 1.0 kHz for a total impedance 0+l0cpvz 5r hxof 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 serigdabd/o5( . fnes with a 10-mF capacitor at 1.0 kHz for a phase a5fda.n ogb (d/ngle 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 series with a 30-W resistor at 1.0 kHz jfsh+gh+rx x9eb+4/a ne;x7cfor a total impedance of 45 W4bjn;gs+h aex7x r/f +h9 +exc?

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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. Wh.e8w-w3i bjb i 0 95d7wq w:yu80ejvjs9zkmzdat is the phase angle? :kb88jqjd0d9 5bwi e.ey iu 7m0-9w3zwvzjws

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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-mqn9sni kzn7 (1H coil, and 1.0-9(nk1nzn 7isqmF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacy +po g3gg6 zw4o-af-bitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. W-yabgg 4+ogfwo6-p3 z hat 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 c2txw xk:wg rewc;:sbpd 973v2rci:w7apacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 1cb v w7iw w;drp:s 3g:2tc7x9e k2rw:x10-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 circu icpxm.vzrz.fe)) hl;w7:/gpit containing a 50-W resistor, a 10-mF capacit plpzfm.hz/ecwv : .7;gixr)) or, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for r/h4 g0oeqynuf)0,kq a phase angle of 0r)y/nqf0,kuqe gho4$40^{\circ}$ 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-mn4h,rvufnbqh-9s +i9H, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivn,rh 9s-nbhfu v+49 qiing 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 sers 17otgc. 6p-ly qea;bies circuit with 12.0 W resistance, 15.0 W inductive reactance, an1c 6b.oqsa;gy tp-7l ed 10.0 W capacitive 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 AC :q 53ewykn::con8l mtv+cr ; yreu:k1circuit 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 resistanceq, nse+-c *vm)jl*thp of 30 W. What is tjh- m) +vlpc,e*nqs* the 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 a ser226( uej3uhbok25i3obssmhq ies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conneue2k3 h(su 2o6bjhm5qi3o2 bs cted 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 frequenchb/h,6 vsph0 g8s o8bjy of a 1.0-mF capacitor and a 15-mH coil in series?hg6jo0bsh8 8s/bvhp ,

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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+ ox.*pbyieyj)m:ymy; 0t o4r a resonant frequie.yxmt +yo o y; j:04bpym*)rency 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 resonant freym2 ;k18guwy/.mgj)e sxic)pqum i1ju/ s8y;)yem2w x.pgkg)c ency 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 bax tz:7 0iujw8 6zw1vseries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to iu1j60v78xatz wz:w b be 1000 Hz?

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