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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 fm4ckkj-w9 .zf4 t**ntmt y:l 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 induoit: zpry 50es1i3z1oction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces 4/av fub+1vji2ibo 1zwhat kind of change on the inducivou 1 b+i4zf1v2/ajb ed $emf$, 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 56oh: gugtsya8tbj9w 2, : pcxloop of wire produces whatap8xgg yc: sttw:ub9o5h, 2j6 kind 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 o6vsf (5(:tb wcm 2:f g qks:m:ce:nsgwf a loop of wire produces what kind of change on the induced k s(c:5wgfm2m:tvc(:en6sg q bsf :w: $emf$, 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 ai6bz( hnm) k4from a magnetic 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 in a conductor wi5anv * 74pd;c q( ;a1dkqgtrnt. yk-zxll be that which tends to produce which of the folloaqd nk x. p7n-(at4yzv;k r1c5gtqd;*wing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abo-e +kts l6 prdv5/iny1ve its center with its north pole pointing down. The stationary magnet iv+ pes/k6- l yd5r1tninduces (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 ma/fz,klcd :r) cgnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when cfz,)/lkrdc: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 t3 fo-2.b vm rxlmz/v7nfl xl:yh2q+q4he magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as h orl2y2 /:mx-qf.+v4 mlzv37nx flbqthe 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 wh( dc4;vx r tvjsz8(2rda(4cdlere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induc4j2c;c84azt vrx (dds r(l(vded 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 regi0- bo dhb+4osion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction ofs0 oih+4d o-bb 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 jp,iyx mm5z:c 7 6ru0nand carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. x yni pz6:,50mmj ucr7 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 om.6vvsu6u hjfu7s vh au,/ t:)em5q2north pole entering first. As the north pole enters the wire, the induced5 )us ./ 6auv 7:,thjme6uvvhfu os2qm 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 speed about ajh4 r1;ojx6+8l xk1adm jwb6w pky5s+n 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 in lm+ 6 +skwjb5 w1od4;1r8jpxxjy6 hkaduced $emf$ 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 a-quhx-;2it4c prm fp) rdbf)6t constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field4c;rdh)2- t) b- fuf 6mppqrxi 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. mfn54pgege 2;
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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 thaj* 44prnv mqy0t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. k;ivrgd j 5 )q3ql/w8uThe $emf$ 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 (orienitan80n i( 64wz zptbs; 6i(tvted in the east-west direction) is moved northward at constant velocity tn0i i(6 ;b4ntpiz6 tzs (8avwthrough a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anggf5ka8lhu7;-k1o u um ular 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 t,myoomykna ws p+ 2)/)ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequenc y6;xcdv7 lc; ci;sa 3r7et3*,chk/ kgxqv e.ey of the dcc g7ykcveta;s vc7ek,3l;;xq. ei36r / *xh$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de(w.y,u73wx9kwb t k)u:vk aj0 dch c)evice 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 devickgh,lp8c2) hp/s;/i gbo k+w ge 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 secondyz-q( z7ds ui(ary coil contains more loops than the primary coisi z-y(qzd(7ul 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 me;gbnn/ .smq bz,v mp..dh /s6ore loops than the secondary coil then qbh /.;msn..,p6 gvebzsd nm/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, the powerer.so wq3kr.* 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 x/5-3.nlx kktvwrtl9circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal baz,s(0; e /wrgdipxs;r ttery of constantix/w pd es( srz;r;,0g terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seriema u6(g68 lrm0 bdyb,0 ta3mqws to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thd30,8lrtqmab a606 myg ubm(we 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 i,v)+ jgcbcwuw,tgrz23p/ im-yyk b -4nductance 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 resistaxfm+ lcg.: o ve4jz+1ynce 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 c1y7/ t7n w44 ,7+rtxix(ww ixkaj ugdtonnected in series to a battery. The time constant for the circuit represents the time required fnwjx7xt471+ ,x/7gwit k aw utiryd(4or 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 battery. m 3xvp/4w mb9eThe battery is suddenly removed from the circuit. The time co/mmewx 49bpv3 nstant 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 saqe-1 fsool0a c *m.kd9me 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. +h(jftk5jo a2 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 conny 6+lyp7 hpta7ected to an AC power supply. In this circuit, the current77pt6lpy ay h+

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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+9 a0xgf2g vrz an ac circuit changes by what factor when the frequency igfr a9 2vzxg0+s 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 indufsbl y2v14. f4gyc 4dm;u:r/i.di ej wctor is doubled, the inductive reactance of /2 biy4u.dfy44:cegj1 swim.dv rl ;fthat 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 at+i;-dudspk t6 h0+fnpproaches zero, the inductive reactance o+t0-hkd6 p ; uidtsnf+f that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the /7yxw 2it(zrg+sqkk( currenk/x+r(yiszg tw72 (q kt

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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 ai6i m-06dd uto tzg.e*7 -agjan ac circuit changes by what factor when the frequency is triidz6t ediao7ag tm. *-j0-6 gupled?

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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 acry n7n+ag-)e b wdwiz87oss a capacitor approaches zero, the capacitive reactance of that capac +n ed8-ia 7nbygwzw7)itor

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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 angljo , lo8mto)(sltrd9(e between the voltages of the inductor and capacitor in a RLC series cl ool,9o((mtd)tj8 s rircuit?

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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 defined aspg(e7-- ie els $\cos M = R/Z$, 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 indgsd1 ji8i+ ,7qezpyi( d6a;acreases. When is this stateme,jsdp;d a(ei8a 1+i7 6gdqi zynt 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 circ khch -.5x6w-pl gony6uit. The 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 ci kkl 3rxof* *jncmk9(8pr:bp(rcuit 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 bo cbo,9kr ezpc(9uq d6,th double in an LRC series circuit, the resonant frequency of thezuc6br (9 ,qkpco,d9at 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 appl,ut o93 lbdps tnr4ovd4q**h: ied 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 c6hw(k,yarx b0rxhfw q9e* se3a s0i5b- 2 ed-uircuit 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 fieutuhvu+osr 0 6abe 2fp,* 33afld of 0.20 T. Find the magnetic flux through the +ovph fab2r*a3us, 60fuut3 eloop 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 rotating in a unifor *,qtj1hby,,n d* bdzmn;w6p-w )qfjgm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the ma d, n t*phzw,nfjb6d1y*-,q)m;bw j qggnetic 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 (nm/ b2y wd/ .sgs5m0.hohul ein a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop (.wde g.l/o h/y0smh 25mus nbwhen 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 adjustable single lox4 x-ub7k;yaf:n87qw -y wsbp op 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 fro0eac)ql9: 6lltf:sj tm $4.0 \times 10^{-5} \; Wb$ 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 q saxl4nt0kl5q4z.e9 cm. A 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 the average value of the iq l5nk9a x4t4e.0qsl znduced $emf$.

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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 area of j ,lynft 1vr s+-dl6v3$0.40 \; m^{2}$ 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 )cp-y2zs kfild 23ww8 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 op2k r7gow rb2 g0j5s)zf 60 m flies horizontally at a location where the downwg 5gs b0pkroz22rjw)7 ard component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 5t)yieonze y v 0zw2y gi*(00x ;ff*dl2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field ofi(z5yvyl dt ee)gf x0 wyfz;02n0io* * $5.0 \times 10^{-5} \; T$. 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 are;gk p*ddht,2rd *mwao8y * yh aixilc5 cq22-4a 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 w :+fgr-gw4s qhq -6up(ptl/ ucire 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 ar97dfi f sv-+krmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is per- ffrd kvi7s9+pendicular 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;62vfze:ng pqkv to 08 of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 129nuz8go389ez eqhcb7 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rota8ho989 uqeceznz 7gb3 ting 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 maximux ohm5or k9molz;858o.+okowm $emf$ 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 j66kyh:2l hth(h 3.w yh:p hnn6ewaf(have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a rek0hk m*gi/o8g kr29zx sistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed ii8kkhrxzg/ mo20 9*kgt generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pz,,s mycrbirdi,j7m0 5 fm .5sower supply. The operating 07 jr dis. c5,,,s zmmfy5bmricurrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a zq0 47ruv ,xix,4dq2mnfl0ag 24-V power supply. The operatinmx aid,zg0r4 fu4 q,n72x qv0lg 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 connected to a 24-V power supply. Tj ,a7tfv9 7hjd hfcjj25.v 7sche operating current is 1.0 A at full speed. What is the bacv.j7fjchjht7 sfa ,927 d j5cvk $emf$ 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 neededq.b7;n ehki ,x*ak c.f to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in thepi/8wb+)y ahzoid(40emoa.a a83 xse secondary. How many turns are in the secondaeoiy +op wimes8 az4ab(0 aha/.x8)d3ry?

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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 ht0vjx ,u7b -lq8uvt+in a 110-V primary if the 24-V secondb- xhtl7 ,8 tujv+u0vqary 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-turn3(*3ebnan z8-v ekzcz primary coil and a 2000-turn secondary coil. If the current in the seconn-3 cnb e3*(zevkz8zadary 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 transformer. Assuming 100% efficvw;i jhovw+:4iency, how many amps at 24 V can flow hivj ;:w4 +wvoin the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The qmqco3/r-1d81g wg.dx 1u1hwp1d e zjprimary coil o/cogr1 e8qm dgjd 31q1 u1pwzx. w1-dhperates 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 and 300 turns on its roy7:8.o-ys s abs ;cqt6 pw.usecondary coil. If 120 V at 2.0 A is applied .sr qwpts.s :oa ;76-8 oyycbuto 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 r eu9ca5fw/ 9vu2ts /)u gjoa(turns 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 wu5ro2t)99av efa /j s/u u(cgpresent 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 transformekgnfxcha .h0xvd5d) bbm, 9:5r has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currentncb bm5h adg, 5k9:f)h0.vxx d at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnswojar48y me-xp: h p0z 0sn z)we6ju+5. If the input voltage to the primary is 100 V, we can expect the output voy60:)5p-o0e 48rj wanmpxh zjzus+e wltage 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 tur-j8b xexv4f mw; a4x;e91/7xaoeyvhwns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outputxf7xvw v8h;ma4 ;ja91e-e/xo y xewb4 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 steppsmk1c:5 hqqt bil;w 36ed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 kc;sq tb36whimql15: 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 currk7i: l a20qwxo3uhcr 2ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted qoha27 u2k 0rl3xwc:ithrough a power line 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 5 ona29sqh:kif 02n zi d5lv0vof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not sqv5 2ahl2snko005 9i ifn d:zvtepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance o+a1 j:l ozh lrj 0hsu4vgs1,d*f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy g *djlj has+ 01u4 l1:szo,rvhloss 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 tor365oz8wv k m39xhmrztal 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. What percentage of the ozzhm59 v3mxw 8 6ork3rriginal 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 V. How much less esvko h6h8bu0),v/lm power would be lost if the power were tm ,)ksu0o6ev lh8hbv/ransmitted 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 9 w)1ks-mp 3f33q*jryoy mi4er btyd3be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppedry9-)soiqr4 yeywp3*fdmk3t 33jb m 1 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 in g cpfj m:h8a mc2jt)-,x+:i;exdrdi8 the coil's magnetic fi::j)t2m pr8+;ehc8-ix di fdxacgmj ,eld?

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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 :rq+pq8zuku;se o;e2 a 6.0-W resistor and an 18-H inductor. What is this circuit's time sk+:rpuoe;; quz 2q8econstant?

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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 . ize7h *f6nhuthe 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 1 h7w2s) ah:2i*5yos )zguwpd k20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wha(a5gk:+tqc0 lrsp f *r*cz( lut is the resistance of the lamp?us *(r l 0ltc+g:*c fk5r(zpqa

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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. What is mhfol hdzpj*2( ) m *a2a5bm3nthe peak current through the resistorzan ) fp* hoj5*2dbl2 ha3mm(m?

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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 thet ( r46ye7jook power dissiptr476je (oko yated 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 *(n,uir,g h a2ij3kvp 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-W8 tlaqh/6ggtoj ,cft01(2pn o resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is9l dsrx* .1q +v*a4m hd8frems $I = 0.80 \sin (240 t)$. 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 reactancet04u kyz0x5re e 6kl/3dng,lu of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 x5s5pq0ms .l4 m 93y *cqesrioHz?

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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 14.0m ;d,i+t6mu ov-mH coil 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 reactanc9uy,4i2 m/vhroc(w8 **i3xxbm0k sue wu5l jde 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(bv6l38 frp wfzkg 1/m0hb -fs at a frequency of 20 kHz is p 3hfbzl s81/mfgf6v0r(bw-k applied 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 tu -0fysz/l94xgal-nh +hr +ir o a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive rm-q)augd;j b6 7b r;yzeactance 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 needed to have 50 W of capacitive reactance auk--kt7xljsv hl,esj 3 p y250t 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 alpqap u/( ,o-h 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 capacitor be 1tm8 v 61q fniit)7co61x svie(00 W t)7oiesn1v m c66iixf( 8qtv1?

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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 capac 1lwa9*vnf95 slu*xp uitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit withvqjs2t3neuyk4ixxy;,.b4 w0 12.0 W resistance, 15.0 W inductive reactance, and 10.0k yxx y 02vs,qjut.4ni4e3wb; W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if o1zd d e y5x 5)a/tp7icb 9:gvwq5ipu1g)zml(a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte5 i 1xopd1z:uy5p9eilgbg q/z m)(awc) 7t5vdd 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 coi)hz71 ;uzehn2 egntx. l, and 1.0-mF capacitor ar 7e n2xg hzuneh.);1tze 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 sxf*a fy-xqsac2n ym7tt/ qh r.(3 h5d,eries with a 20-mH inductor, what is the imthxtn5h.a*3rfxm / 2q,c7 ydqsaf(-ypedance 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 2ehk:/1(l lwa kk xbb290-mH inductor, what is the phask12 kw9hkbl:e/a (blxe 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 needefs( 9 iy eq0 z5--;j(h2guq49sdq1mxspeai if d in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 i(f5 9 2udqhif4; 9i ya10(jgsm-pseeq-zsqx 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 capacitan;s9-rjyf+yp,an noo81rp xc*ces is needed in series with a 100-W resistor and 15-mH coilc,roo s +-1n r8yp*a ny9;jfpx to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be puu4n32+oc byiunm 5ysqbb.u .ug 9rk) l -k/s0wt in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 Wl5 uu nbg -yk0k.w+2oiubc m4) .u9s3snbq/ry?

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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-kyfx ;ypc5ff5h1db,h; W resistor at 1.0-MHz for a total h 5xfbd y;ycfhp;f ,51impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is tl*l5k 3 -tuhbthe impedance at 1000 u*t b3lhk-tl 5Hz?

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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 withy,ooy(; iz7 fftk:9 8w)euxu t a 10-mF capacitor at 1.0 kHz for a total 9e yuyx8uzkt ;ow f:oti(,7f )impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nd- d0bx)):6.lz br7lats ti eeeeded in series with a 10-mF capacitor at 1.0 kHz for a phase aned .bex ldrz:a )-7 libtt)s60gle 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 kd*gny:1rj -i+azj9m iHz for a total impedance oaji*z9di1n :r g-y+j mf 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.(m z wgeq2 yrh*rk*v:r7udz8 ( What is the phase ez rmvrk:( h*8rwg2y 7du(*z qangle?

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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 nawd9on 7 da ,fig8o+.,*jgno 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in gndg,. * dajfono7w+ia9 ,o 8nseries?

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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 10o7dhx who8-. r7g/ ( 1ogwonvi.0-mF capacitor, and a 0.350-H inductor. The ci/g7n g.oiwo1hv(odh-o87x r w rcuit 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 reac,z/.3ee dwdbt tance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What /deztbw. ,3 decurrent 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 series9o .-3xzrql7 m(dtucv RLC circuit containing a 50-W resistor, a 10-mF capacr (-x39 lumdtz. cqov7itor, 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 i(,esi4/agjph 1ve rle;u cu/0n series with a 500-W resistor for a phase angle ou /1s,0e ;lv eujp(ihr/ac eg4f $40^{\circ}$ 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 R8 hcj q-biz4kbjr 0u;y191qld = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be drivej1qj91zq b8k4 h0 bl-ycrdu i;n 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 serieajnzytys4 .7- s circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V po7y.n sz-jt4a ywer 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 circu0 to2du -h,zrdit 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 r p0nx,of8gb t+ado1 e:esistance of 30 W. What is th, o :pdtfbnoa e81x+g0e 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 series RLC circuit con)f)b13gzp t2zye cg;g taining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedbz tg g;fc1 y)2zg)p3e 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 capacitor and a 15-mH coil in serie ,yser.:, 4m .lunwhdxs?ml,.nyh4se .wrud x,:

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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 atsi7aw8eq0 5a resonant frequency wi5s 7eata8q0 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 *zgnza gr 4 x/t.io b73lob0a1frequency l1zan zob.g0g3*tb /xaro74i 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 pla )1ey/+ wk:5ky 8hse alijiox*ced in series with a 30-W resistor and a 40-mH coil if the reso)o yhliy eikw5 ejxk*/1s 8:a+nant frequency of the circuit is to be 1000 Hz?

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