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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 unitlb 8/(smwy/ /tgsba2a s of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thekrm4aq 3.ji vl 2tv2i- $emf$ 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 ,/rosp (rpik 2rx4v7ze c6zv):eqw)ewire in a coil produces what kind of change on the , c s4 zqw7e kr6 ee2(:ipr)p/ovxzv)rinduced $emf$, 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 mzdwo9hu 2higab1: 9f 6 z(4icthe magnetic field through a loop of wire produces what kind of change(huz6 ia ghizwm1d9oc 2fb4 :9 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 6:4atd0mzaot/ nfsv;g0nf,m 8 1swy gof a loop of wire produces what kind of change on the indu,w;a6m1ff gny0n s:dt0z ovgm/t 4as8ced $emf$, 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 magnet37+ btr suz+kgic 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) 5(z(5iiiyxlggmc 3v in a conductor will be that which tends to produce which of the followinymi((g5 g5i)z cv3ixlg 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 horizontalnf jp,,yadgd:(wqu6mw; 9ng 2 table. A bar magnet is held above its center with its north pole pointinm( ;:26y9,wg an qdu,wfgnpdj g 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 magnet is helwxtqo1ey rx g(6azj**c9a:b3z;eb5rd above its cerg9e (rj q bcxtx;6y1* 5z*zbe3woa:anter 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 wh-d bza7j /owe.ere the magnetic field vector points straight up. d/7o.-zbe aj w 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 region where 9e(gf3 ibgrz (p;l9- rb0 cbkjthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in thi 0z i(b ;k9j(9-bp crrle3fggbs 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 magneb7g lq ww.-2v 3 bvkb39q*fthu0hg+ hftic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction b f2qbvh .9gwfw-v 0+q3h3 tublkg h*7of 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 horizontal table and carries an eves d oq:)90m gewxr82xgr-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced c2e9g8 x:xgwos0)rdmq urrent 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 heh f6u;o6r;rwire with the north pole entering first. As the north pole enters the wire, the induced current will be 6uh;;ef hr ro6(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 aaox y zp;k.pm1q u;es2i0i h 1)*gbx7dngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straio b*d1hpzms1 y2)pxgu k;x. a;i7i0e qght down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe1 h0 dtz9 ollt-hqfd*-scws+c r2)gg8 ed about an axis whose direction can be varied. In a +dwdf9*2gclozc 0hr-sh ) t1s lq8gt-region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.fk;(n-vyc;wq - 4jvzt eur3) t
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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 an i1(2x vw( 7mpa/smy5fzcd (yf$emf$ 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 magnetimz )78dtkk 6fwc 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-we8fnv/v i al1p;q4(384q /aaw sxfdkr vst direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosaf fq(8iv413s48wd r/ vakapqnx vl/;s 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 aq5 zgfh4.gza xffg th;vd,jq .j w3787t 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 generato,g;8g c kqe-hhr 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 through 60 revolutions each second. The frequ ytj)2noetmp5lux *l o2a+)0c ency of ttx2m ) 2aucyonolj0*le+ pt)5he $emf$ 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 devic( d02tcugrf p4q4 -bqoe used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device that1+d( lvpkh+kfw7 z l-b

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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 conta*) dw2zev 7ng (;qfqsjins more loops than the primary coilnqfs(je w*qz72;dv )g then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondar3s v4 2g nxnpgso2+(vjy coil then it is n gp+v( 3jxogs nv2s42a

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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 powe 2ibcp9kzh o)s59ls/mr 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 ciro4.xwee n4*cbcuit,

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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 inductor8oe5qh8 r:wh (ooj,ut are connected in series to an ideal battery of constant terminal voltage. At the moment contac(otuooj8 ,e h h:5qw8rt 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 connecte.:r4hi; qv bl 88vn*fa:dsuhs d in series to an ideal battery of constant term.:inhh4va*;uqvf8sld8s b :r inal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductancyu7c5u( i.9fcqinv0w e 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 connected tod-5c oj0ir, 4g) gs.u tt6fsvew /k5cm:rb5zv 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 seried6 2 gasrmw ( ahqap5(5g9j:cas to a battery. The time constant for the circuit represents the time required for5((aj w5h2c6gqga r maads :p9 the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a baorzq83jm3 9eox d) s)kttery. The battery is suddenly removed from the circuit. The time constanzk3emj)doxo r )3q 9s8t for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unzx6z oslnq 7 ixdqd):o75b)i:its 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. O/qrtb mi.7el q 27e(tjty3 fe3n 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 connectt+8g(qv)hk47c bzv ob ed to an AC power supply. In this circuit, the currentv8 bhv4gk(bz co+qt7)

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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 circuito85v-:zdim zx h-,ya74jli tg changes by what factor when the frequency is trip7j8mtdvg4-xz-:yl,a h oz5ii led?

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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 doubledha(;zqt5 dp 8pea2r6s , the inductive reactance;6 rpdt2a8zhepa( s q5 of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, ahs.j5qk.wu sjr- /bh1(*jeethe inductive reactance of that coil(s uj/*. .-ehj1rab jeshqk w5

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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 circpkh mx;sqqg ij.;k f9lg7)d1.uit, the curred.m ;gq1ji;7xfpkl ).s qgh9knt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the.v(ly x:viw y( ocs3h0 frequency is h(li: yo. c wxvv0y3(stripled?

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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 cagctv +/3 qp5g0jqn*n hpacitor approaches zero, the capacitive reactance of thatq*jt05npvn g g3c +h/q capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and cbp z/eef0i /-oapacitor in a RLC seriez eb- ipe0//ofs 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 defiy8sg z./(dttwhd j:028t utnfned 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)okpk2ppnum9uzuh bgco9wb1 e h1 0n-c, 78(j . When is thhkcjn ,m9b1hk28npogbzu pu7( u1p9w0e -) cois 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 circz g,u622;z3a9p wqq ulngri s8uit 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 increases i5vuinl8e8c.q 4f,b apg mdb55f $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuk y, bll5ulg7*at ,m9sit, the resonant frequency of thbkagl7tml,, s u ly5*9at 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 voltagew kpy1;rpj cafb/(23u. 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 RLC2j8 1;dg seotyh: 8cqw circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatinps*45wpo7 tkyg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop w*5t7 4psopykwhen the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field :nmckez49sw q/smf 36of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic f3sk4: zfc/e wn96s mmqield 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 fi+goi rx x kj c(rxq3i7,8+yi9oeld of 0.20 T. Find the magnetic flux through the loop when the plaq3o gyc i+rix xok 8ji7,x+9r(ne 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 adjustable single loop f e)2je albi7(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 qouats k)fme+ ,991mbfrom $4.0 \times 10^{-5} \; Wb$ 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. Av rj-yan0 ,;re uniform magnetic field 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 r j ,0-ran;eyvthe 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 turnscpl2hk5l c w* x41 hgbaib,7u- and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns uy7yd fqmwx (.8c*8gm and 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 horizontally at a location wqiih9kpy/:n- b 38v nyhere the downward component of the Earth's magnetic field 9/-nq y:kpv hibn38yiis $6.0 \times 10^{-5} \; T$. 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 24q v; vjentyy7 3uh1ntn*-iz ..0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ez n 3hv; -vejny7u4ityq*n1t.nds 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 cros 1grh3b)u (qses-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 wire ac sjx*)i*0)pmdpp +c 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 l;vtk0ob7cx : .qor72d h-esv toop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an .br okh0-t 27 c:v;sved tq7oxaxis 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 consi7lm1)au5pf)h lgor ,mif tm/-b25 dmn sts 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 constrerw0+-rhl x+ zuct a simple 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 az 0ewhlr-+r +xrea of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a genqm 8+ 9uq/+p0 xas (rpv;r8oq5iiiyqserator 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 mo -+ra (8cacs ex )b)ma gm,an69vjdh2ztor 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 hlvn-gfvj)sid(q 0-; have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bav)jf-vq0g-d (silnh ;ck $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power s*mh,c 5f5pw tzzex :2cupply. The operating current is 1.0 A. Whcpc2mwt5hz :z* fex ,5at 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 6.0qw7ia8 bps )w8,:.ubdhgl v,h W is connected to a 24-V power supply. The operatib.db87wva8,,g wlph)u q:ishng 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 resistance 6.0 W is connecli/)4q8aky/9 brcdr dadr / v4ted to a 24-V power supply. The opera r b//crdd984 kdlyvq/4rai )ating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltcvhxn.qbs1+bt75u8 snyq- 3 h age 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 An p;t8tgbi-7.afm/ * bzqd xm6 to flow in the secondary. How many turns are in the sexp8 n;a6*b 7b /. m-dqtigzftmcondary?

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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 1ug5tiyn5q6p 24-V sey 6g p15n5quticondary 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 aemx-fe,1gl4- y h 2xdytr9(yu nd a 2000-turn secondary coil. If the current in the sec -eye-(yuf mgl4 9hd y2x,xr1tondary 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 ac; 8a1bm6ys xe transformer. Assuming 100% efficiency, how many amps ;ce6m1xa8 bys 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 a6n bawq(wtc my l(8c;0 neon sign transformer provides 7500 V at 10.0 mA. The primary coil operaq06tawc;nb(w8mc (lytes 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 turnsf x1mkyp:79xf/ htq0d 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 present in x7h0q/9dtyx 1kffmp :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 tuspmo8/nz +)ea;qop vmm+ q 5(grns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present io8/ o+mqpn+;zm qa5s(mg ) pevn 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 tur9 rx: t0 sz7lfnq,;asgns. If the input curr xa0gfs7qt r 9,zn;s:lent 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 i hhfe p;d/+kux:9d.otts secondary has 200 turns. If the input voltage to the primary is 100 Ve.; dh9k+po xth :ud/f, 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 secondary has 200 tur 8lstj 6urcpw,q +8z;kns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional lossl8ptc ;ujs+q ,zrwk68es)

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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 usun2+ ovayvumx,.gdznn5(c l89u 1 nls 8ally stepped up to 4500 V by a transfod8v 8n, l +syonuv( xl1c5a n9.2uzgmnrmer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120,*f) xug6b bhk V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lk 6uh b*fbx,)gine of total resistance 1.0 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 steppe22c/x nhwuk -id 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 /n k-u xihc2w2stepped 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 rp*l2*c gt n,6*cfmmuw esistance of 0.60 W. A generator produces 100 V at 70 A*p,6wcm*glt2mf cun *. 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 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 resistanceswqtu*zjl8ko 0,a-g;l ; wj6z 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. What percentage of the original enerl 8jw;6t0,qloz* kazsg- ;ju wgy 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 V. How much less power j/ e25w7sxv7j yk,az igg.-8r u7olcxwould be lost if the powuz7 2s xa.xg7cre8j ,-/o5vkwgylji7 er were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitte k2tc(jln e2o:;s3x onyt,h(d d on a line with resis2 ;ne(lt3hyk (odx2j ,:ncotstance 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 currencbrikv5 ouvim-des 8 j;-ek;)w6we .*t of 5.0 A. How much energy is stored in the coil's magnetic field?-wbrj 8ceuw vkseve)o5.6m;kii-;* d

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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 i-1tb;a 5wadxenductor. What is this circuit's time con; a1detb5axw- stant?

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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 c3 7elthpi0l3o n9z(ccircuit 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-Vedj7yz4(j-6uk s z jac-t60 vb AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of i:6 t9 nqdc/bwthe lamq b:ictd n69w/p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply.cmvp h u )uhfg9l4/36c What is the peak current th uv plh)m/ gu9fc63hc4rough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dissx*h8qdc dk -8eipated* kdq-x cde88h 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 5wogec/ak k908 0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis wq6k:0er qtkh zxn6d 7)w,mbftqy-7 3ol.1dotor 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 mdm+ ;41ku/s*y;3 d( fwt z ltb-lwtlozx,eg+resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 606kc63uvk g g:tpi.l b; 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 reactx bcspt4t+;aku)v59iml7f b;; 3 y vteance 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 indu i /p -ulzg:b.yjskx +vsh--x(ctive 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 indu 4hi(dbjcm4-d (tprn8m3u6i l --kr yqctive 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 at a frequency of 20 kHzd/(n (2ma /.gq zrt01ftffavt is applied to/ f vn .z2tg(0q(aam1tfd t/rf 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 He+p j.ge6mp m .yv al+9qvhh3: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 fzx0y -vc9,r t*9pdupat 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 50 W of capacitive reactance at 19g roa qfx*,*r0 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 reactance ofv-1a 0: 4fbna+auii 7 tu(opuc 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 thfl 2w b7*fa2s gmt2zq5e capacitive reactance of a 0.010-mF capacitor be 100 W? azgfbt5*2s2wmql7 2f

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 :v83qb )ayvv 4j gqev5Hz 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 serie9y9out moj3s.5 3u0f 6c6huiehyo,dhs circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive ryhco 6sm5 ej io3h,9fy.huto3 9u6ud0 eactance?

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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 Hgu j;i-*,pluk0it pd, 7asux6k 2fq q6z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are ci,6f- k6su2q , u;gdi0qpplktx uja* 7onnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH c5j nuwvjd1* d5oil, and 1.0-mF capacitor are covjd5j1d5n uw*nnected 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 isc.zuxu/ -b w bg)io,i( connected in series with a 20-mH inductor, what is the impedan guwuob/),zi -.ibx(cce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor+yfs-r6kbp0fwq j-siy 2;m y; , what is the phase angl kw-sf-;fiy+ypj0m2y6 s ;rqbe 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 seriesjvaznjz2+k*zoi* u i9q+2o2 q 4nh+lx8/ x bxc circuit with a 20-mH coil and 1.0-mF capacitor for a t * vqx9 +o+bzjzc+/h2xjkz 24ixoi an2l8nuq*otal 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 8cno19owkl udy6fea t07 lx51 in series with a 100-W resistor and 15-mH coil to get a total impe95n8oc0f dt kue1y61 xol7lwadance 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 wit z5stok5o di*8xatk pax:64o-h a 450-mH inductor at 5000 Hz for a total impedance of xztio-:8x6k 5satdak5 po* 4o40000 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 inua yrqxes 041hwt8r6 e.wh3 6 ,udxu.o series with a 100-kW resistor at 1.0-MHz for a total impedance o606wq u rr. haowes e 1xt3.ydhxuu48,f 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 serie 13xpax7j0r fj.hp3orh:b tr0s with a 20-mF capacitor. What is the impedance at 1b f1:tr3pxjxhoh0rj7pa .0 3r000 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 nvl,z )roi74w w;np/ ayrbko 8,v/p bp3eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4 3n4wwovrppv pib/),y7;b/z,8o l kra 5 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 az6 w2ypzw+yh(o .qq0 jcne6fix +v4,r 10-mF capacitor at 1.0 kHz for a phase ang +, ejfqzpwn+x0zyi oy(w2 v.h4 q66crle 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 ser0 lz9 yr)9 rf:ev98ahbhiz ov:ies with a 30-W resistor at 1.0 kHz for a total imz9: ir zh9v0f rov:9h) le8ybapedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Wh.7jv:yzjm- y9xr mly 5at is the phase amrj :v-9jy7xym. zly5ngle?

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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 1o;*9s4 v wjs2.mjdbgm500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?b;49 mdjjss*gw .mvo2

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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 consi q: :n*8 anch*erqpa/asts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current*npq:eh / q8aran *a:c 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, wn,l:s7xi dz+ fubp:c g;50cea capacitor of capacitive reactance 30 W, and an inductor of inductive reactancc+; l x0:scpge,b5zwnif7ud: e 30 W are connected in series to a 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 cont1j jo,tb f90warblg)+aining a 50-W resistor, a 10-mF bj a1jf0l,9w tg+b r)ocapacitor, 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 resistodtt9g.4 +fjrav6ck,fr for a phase angle of t4dcgr+6 t f9fak.v, j$40^{\circ}$ 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 qisham4 - lj234ky ps+= 200-mH, C = 10.0 mF. At what frequency sho2 msak+ jlh p-is43y4quld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output 7p n a+s)p3avdin an ac series circuit with 12.0 W resistance, 15.0 W i+7d) npsav ap3nductive reactance, and 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 circuit6vx 16m8mgo5e,ed: ypd8eop m 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 resistance qjv2c ru0prx89a *-gv pj(ff9 of 30 W. What is the power factor?8v q9jgf (uvac r2x9j*-p pr0f

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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 3-o3wwgywl 4aRLC circuit containing a 50-W resistor, a 10-mF capacitora 3g yw43ow-lw, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacie)let m-4s6vx tor and a 15-mH coil in series?el4-m 6)stx ev

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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 iq .s lwvr+v83/bb joc/n series with a 4.7-mF capacitor for a resonant frequeqbwob v3j.sl/8+ /v crncy 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 fo szhf*;w-7- ry ed .tt)zmhw7gr a resonant frequens*7f wz)mezy dw ;hgtt-r-.7hcy 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 placebx l*k-j6r)7fgah k x-d in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the ci*kf- kxh-7)gjr6xlb arcuit is to be 1000 Hz?

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