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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 magni.e)x n+azo3ij; zia 0etic 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 thys1khfb kx2+ 7;ck:n 2v v(velat 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 what k: hzsw8 3 oeh9xuejnnk vc6)9(ind of change on the i6ve xn8jhuc hs)e (oz39nk9w :nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces whator: b3q comqel;;:hrzv03p j 9s r45mb kin:9 4b hr m03;op 3bmcsze;:r vq5oljrqd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire producesnkv apa;iv;hldd,xq/od3- n+ j j.2l/ what kind of change on the inducnl;3kqahnd dij v;,lx j.pd //-a+2 voed $emf$, 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 j02id mt8pi*s 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 v0t0czp8 vc/-b twfpxcb t)35will be that which tends to produce which of the following effe tv3ftcb 5p wcpzt00cbx8-v/)cts?

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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 :m6u y*virw;b8qss j168lmr pflat on a horizontal table. A bar magnet is held above its center with its north pole pointingjs;m p8ub8 :1r6yil* vws6rmq 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 sox8s95v8 c 8dquninq)d8c,qheld above its center with its north pole pointing down, and rele8sn9dqd8nx v)i8,cu oqs5q8 cased. 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 tabl1 05z:qbcv s76ifyvfpg i3kc6e top in a region where the magnetic field vector points straight up. The maggifvb:0yc6136 v7 fiz5 ksq pcnetic 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 the magnetic field ve a 6gh ll7 i/d6uw9b/8+js83ylhzlaq pctor points straight up. The magnetic field suddenly grows stronger./qll 96 zlispl3w7h ab +6d gh8/a8yju When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on iucay.1 r*,rdcho)9ia horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the id1h.)yaoui r,9rcc* 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 horizrk m7k;3v1icl ontal table and carries an ever-increasing current northward. Two coils mc 1kilk3 v7r;of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first.-l wq0dv6o ;sd Asdlwo-vqd ;s06 the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe4:de7iuzz,h5o5s awyl;8yge1 l hc d*ed about an axis whose direction can be varied. In a region where a unifor4y*h55 igzs7;wco zuylad ,e: 1lhe d8m magnetic field points straight 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 sp gv49u(lx xs2b da0mp,eed about an axis whose direction can be varied. In a region where a uniform magn( 4px, m9xvua2sd glb0etic 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.9f:wa q 8l10*z(fctbo9 hbtrnl:wu *j
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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 tkhr7j-(/ sltws owue2iz173 dhat 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 magnetv.-zlf9pu9* cc 4 dvftic 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 6kjrg0rpi70nm79k* a8rluf):- 2 j bskpvpwnthe east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement cs 20 jlw pn0977r)rfknj :v-prb km6*ipuagk 8oncerning 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 azq -,hi46 bulj constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tr(i 9 f / ,:qhc*jwxfi)c2jyjafansforms

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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. Thal( ccvil)ukxil.d+ u)d /1k*e frequency of thel (kki /a*1v)cicdlld+.)uu x $emf$ 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 dqy4t(dj9 om 0rjj,a: bevice 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 d9w.,p1woslestg8z+ocd k .6that

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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 contains more loops thanah/y, rj pr,(z the primary coirjrzp ,(hya,/ 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 contains more loops1lq l6yhj2jt0 than the secondary coil tht2hy q 0l1l6jjen 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 power qy iztw( y+xr23h(b 3q)a wj-dqig;x9 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 resona-sglv52mgax2 nt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are cond de 63s n tor5pv4m)6d:o7lppnected in series to an ideal battery of constant terminal vn)p6ddovt6p 3pr7m5:4 l es dooltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery r487giqn61 ntsni p os)q cy5)of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor or5pis7nn6 ycng)s4qi t8)q 1is

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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 inductanctn1(+ ykv 5 ;+btkt:d9yb bhyxe 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 connecterc z -1p8bngz;d 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 ah17ujhrrw)hz 84zbzf: pr 53in series to a battery. The time constant for the circuit represents the7fhh8w : 1zz3pazrb5j h4ur)r time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected .nqa k/8bcny-in series to a battery. The battery is suddenly removed from th nyk/a.8bqnc -e circuit. 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 the same units exax cm +) cbcu-*5 0lf-coxmy6ocept:

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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 circuitrva99s3gy s;p, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC powf4-)8dtpkwb7sk mn ,dje usz8ro q7 i53u-j/ ter supply. In this circuit, the curren,tp7deo/-7 5j8zrjk4dktsw s iqu m-bnf83 )ut

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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 cha84;7q gig- pi2oxuakzph4 lz;nges by what factor when the frequency is th;qig-oazig 8p;kpx24 lu47 zripled?

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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, , 4rvbovlv 0sb4 quc8.the inductive reactance of tha0l.bsbc4vr vq 8o4uv,t 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, 9eo:gfv uti 0jz 3*yk566mmjr the inductive reactance of that co 9yjzvf6u i*g0m e6tkmj5 r:3oil

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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. 8: 0zgreg*-)saabp ap In this circuit, the currer:a) gb g*-epza0 8sapnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in3kkse 7; i: 48yl nyfe4zy/ihs an ac circuit changes by what factor when the frequek;4 s7i /ezhlfe43:yiksny 8y ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approachmpii wl-28zg6 es zero, the capacitive rii2z -p 8w6mlgeactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the induc t(+ bp1iv46:zhivnut fr*6tz tor and capacitor in a RLC series cuib41 vi6h:f p*6 zn(rt z+tvtircuit?

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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 a yqd5e .n;+ *ij 8h7wyi(sbeaxn RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impek .tgg 2+auqw qgi s)90b)iua)dance of the circuit increases if R increases. When is th 2)+bki )t0aausgq).9igug wqis 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 /sxbqd4yyi,(nrfmg b/.(q *1)b y ah qimpedance 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 inc qa gp927a00l-ee saqyreases 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 y/4aiq3 8: qxp.vrqcidouble in an LRC series circuit, the resonant frequency of that ci vi 3pqa4iq8c/:.qyr xrcuit 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 applietw:vlv6ylv /5+ls7 ded 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,a dlmtp2e 1miyb 0o(( 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 rotating in a uniform magnetic field of 0.29+g jfm3:gopsi 17va/ 6f mdq;oimw,n0 T. Find the magnetic flux through the loop when the p7/i,f v+9gq;1 6nom3psmoja mifd w :glane 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 maer (8zjbm-+g.yj, 6of a3en ebgnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo+38ajo rmbgz by,e(6f.- jeenp and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a un8q.i8 fmcpfq .wa; yi;iform magnetic field of 0.20 T. Find the magnetic fluf;ciwy;.88 q.if pam qx through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable s1-mwu bi(a 3 hjfxl0diqi+v,w4+g :xrf)m ir, ingle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes frhf**0bw u(jylom $4.0 \times 10^{-5} \; Wb$ 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 2* : 4tbi3g6z 0kp bqb.sbqjyh:00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifo*q:gzhb4b6i:ys0bpb3. k j t qrmly 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 b-,+xvq)9c1/dmglhkgocp q ; turns 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 and a4q8a0p9kn tr nrea $0.20 \; m^{2}$ 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 wherexlh)eh+4nn-t ff d:2 sv8jgc3 the downward component of the Earth's magnetic field is -fdgx3js th2:4c +en8vnl hf) $6.0 \times 10^{-5} \; T$. 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 bhovq t7,4q1 oyar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while q14tvyoo, h7qin 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-sectionayj dp56 f4 ol,d64/yxrczzwm)l 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 w4 xdotcb7* o7mire 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 loopsgt p. wpg:12au3 j(jy tfkwr;) on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel t ugtkjwrpwp2) a;.3 jfg1:(yto the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire gkt )a y*g/g4fof 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 cons53s,i33rykcwxk 9sdtal hr:+7 3ggxg truct 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 ar:d75x9ri3ghgy+ clk3t 3a,gs rw s xk3ea 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 generator/09j*e9m jh8eh xrlha 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,,.jffldcmr*zha z) +6:azqcl a m:.h 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 resistance of 6.00 W. The qo:p/kltfrl1: (a l .wmotor operates on 120 V AC, and when running f1l roaptk wl:q l:.(/at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resin+ hvz6h qbc.0p lli)2stance 6.0 W is connected to a 24-V power supply. The operating curzhnlq)b6hi2plc +. v0 rent 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 connectedws:mne7, b;,(wpysjra)0m j p to a 24-V power supply. The operating current is :pa0 ;je(s,7p,wjb) smrywmn1.0 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 supplsx3+u f24nzwl k9 zzc+y. The operating cuwufc+z +xn9z4zls23k rrent 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 er;apr*:fq as 5c:,cx 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 the secondsmx ++m2x9e92ywhxw g. ya8meary. s8y+mw+gm.xx92 x 29ahwymee How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many mlq4 k c,*clx)dkfs*+turns are necessary in a 110-V primary if the 24-V secondary has 100 tuc *+sdkl*c )fm,klxq 4rns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn d.mg od) 0ka+gsecondary coil. If the current in the secondary is 3.0 A, what is+0 ad gdk.o)gm 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. 5/;k),x ebhw 5kowmle6xn l.t Assuming 100% efficiency, how many amps at 24 b, ).l wxemh55l /wx6tok en;kV can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformek k +eb*p0a-7u;ip *yvwvom4ko/ 5rgar provides 7500 V at 10.0 mA. The primary coil operoe/iou*kbwp my;arp*4+7 0v5 vagk-kates 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 30x ,dw ba:cyg 2h/*hj8u- )xezn7ruau a+ k;8tb0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the sexx+ct 7ebj;da yhuu, z-ga a2b:8*wruhk/)8 ncondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 30op-1x(vv uy+h 0 turns on its secondary coph o(vxy1vu-+il. If 120 V at 2.0 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 turn8rcafvvb(lvb;l9. y2 s. If the input current at the primav ylbavb rf(.c 8;2lv9ry 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 its secondary has n:.- g ru/fb1k udwmhgmv6 d),200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary6 guubr: ,gmd1d - m/f.wk)vhn 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 turnszvi35h)e mflq,9p8x-kp m g 5y and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (nemfq,)ypez -5v 3 lpg5x mkih98glecting 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 steppx6nqf7rxy (ek )u0lz-9q 6cum ed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the p u0yqxun6qm7z-k c9l fx)e6(rrimary 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 7a 60obz 6-kp)ul ijopj5*dgtstepped 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 lazo) -ou kjib6lt5g0 p*7 dp6jine.

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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 .d 8:a389rnwg9rcf* fcs5;byduu ra aof 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 t5c9*3uaadr8adfgy nf w u:s 9brc8; r.he 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 linet3+nagbe - hvsa4s 3(o 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission3a (oe+v4 an3gshstb- 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 resistanc5a) icjhd 0;jfe of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energ j d5h;ac0)jify loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be l; c ( f/0 okoctbc1iqvam1sbe*mx22)cost if the power w v2xcbc 2(km;1atf* ob0 so1cce)m /iqere 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 transmitted on a lirn31hl1j9w (1sd qwugne 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 w uqsrd1wjlh 1g9n13( 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 the ;89xz1nt0u- f d;jb.tsuzyggcoil's mftnb8sy1g0u;z jg; - z.xtu d9agnetic 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 go -je:/o(vtcand an 18-H inductor. What is this cirj/(tv: ocg-eocuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltav96,rd)qe19 amjtloc ge 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 12lj5ogb 67c g6xlyd9dnv54 a e*0-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. What5ai/ ryk2/amx-nkr f 7 is the resistance of the lamp?f/r2ak -m/nry5aix7k

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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. c3)6l:uyuqfq ,c k.e tWhat is the peak current through the refec 6q ul,cy :qtku.3)sistor?

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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+t q65mt shpg+ 120-V ac power supply. What is the power dissipated in the resh6g tpstm +q5+istor?

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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 50o *rt 9-uk;kx1xg rb-.z ngfb7z+bwz6-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 5u ,yvi6gq smwm,zt/2ixs2:w37v 9tu t0-W 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 ygj h(cr.en u/2g *dy 38pcb+presistor 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 )vg2si,dvz.0tl r p. a ikx:9wof 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 100m55 -pr tndn xp4hr*x)kg2q)k0 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)nwg5z6,-qyiexszp he q:2o/.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 indx6y hz,zd t-:iuctive 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 0gydqtouagq-a+z1tm4zi50 - 3 sn,lo 120 V AC at a frequency of 20 kHz is ao ,-4 ilqa-sa0 zty5g03qmu1nt o+dgzpplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110- w,(l1u:)ii-s0onk3nkh obk q6rx jg6V, 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 reacpyyu) :dp t)r6tance 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( s:zna h6+7llzc3g 2cg9g,szdkqq8k capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200sx0i+mnnf79sn 9/fm 4 xa p0n+h u**hyq.fvad 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. :ebjvjrgqmpr5rpne1p2 sk. f 1u00- 4010-mF capacitor be 100 W?1prp2ep n 0g14bsjj.mf-eur05kr v:q

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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-b j/ua rf5f9l 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 series circuit with 12.0 W rrfy p5 )lfo-t.3da5d :dcout uu /a3:eesistance, 15.0 W inductive react:a5o.puddoff3c- :uuae3)yr t/lt5d ance, and 10.0 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 im p2ro*konf 93k6m 5plopedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c9o3kro 6np 5mof *lkp2onnected 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 150-6 g1w; kg,x1bnl ikhm0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i6g1,kwgb kl-h m1;xnin 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 iswjs:xf. z*vim1;6dhbgt r ) q: connected in series with a 20-mH inductor, what is the impedance at 1000 Hz?vz:x q;:f bh.jgwt sm* rd6i1)

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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, mf5)lqc9rn /jwhat is the phase angle at 1qn9 f5r)m/cjl000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit witmhbag b2x//k 8h a 20-mH coil and 1.0-mF capacitor for a total imb/ h8ag /m2bxkpedance 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 re(g, )5suyujmm) 9pmuqsistor and 15-mH coil to get a total impedanceqj)9g )m pm,m5(suuuy 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 gc3z84 bt1sq zin series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?bgs 8q3z4t1 cz

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW* i5ig ynr44jpj-bz4i 2gbd w/ resistor at 1.0-MHz for a total impedance of 1-bi4z/g 4d5 *i 2wjjbiy rpn4g50 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 wiy9 k. cnq:zeh7th a 20-mF capacitor. What is the impedance at 10hn 97k.c zye:q00 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 witd(c(0wnzy j94 g zbyc3h a 10-mF capacitor at 1.0 kHz for a total impeda wcng490d (bz( yzy3cjnce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10gtopvt (9jw y,( l 1l)pxrawpr56**mv-mF capacitor at 1.0 kHz for a phaser)mlr*9*xtv w5jppo (pl1yw, g(v 6ta angle 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 seri(u8lo/jz yu8+o5jec(3tjy w ves with a 30-W resistor at 1.0 kHz for a total impedance of 4e +yj( jw( zjl5o8vuoc8ty3/u5 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. What is the p(dhhh, / r d:e:ntl-lzhase dhdlhhe,/ltn r:: (z -angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 2d*k0v+8t f;wx xv:fkhxvq13o 0-mH coil, and 1.0kf8h d of:+xxk ;v1qtvw*x03v-mF 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 2a ;5tna3ko zy7tzg j3i: i5enof a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit i7tkn5ieynj2za:33ato ; z 5ig s 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 reactanceiyc)hr0b vy2f82.b0c4f d siy 30 W, and an inductor of induc2 bf80dby.42 rycicysh0i) f vtive reactance 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 se ,xmgnsw, 9j1vuecs h ym+ih59 82zmq:ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe5mum1ihs,9 2jvznhy x+cwe:qs9, g 8mn 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 ne aliq :howuud/,o ;2-jcessary in series with a 500-W resistor for a phase angle of /, :laj2hw qou-;duoi $40^{\circ}$ 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-mH, C = 10.0 mF. At whatrfa ;8dps)y;+ wzix/uwg 9 -wo8ayyd, frequency shoul8 /p)x+y;rwg89;yszwa yofdu -w dai, d 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 in an ac series circuit with 12.0 W2mi/zo s.k(c:ved + hn resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancv/:ze hn+(o k2ms cd.ie, 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 circuiy07j a.jxvynt n75 y3yt 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 ab jkv973iy yvvf7 puo ie3,l)1n impedance of 60 W and a resistance of 30 W. What is the power factor1l ykvupbj937v 3)f7i eiy ov,?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rescjnnvd*,l2o 1eh7lg j84e kh8istor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pn1 o8h7jge 4dkv 2lehj*cn8,l ower 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 f 99, smib0/3vlp f efohtyi:yz*3 6byk6g:un1.0-mF capacitor and a 15-mH coil in series?9 pylfsuebg 6toif m/6 vb3y: *k30y, fnh9i:z

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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 a -e0yil3;kb -lj97e9 b fcbdxeresonant frequi9b0ede3bf-7b- elkjlxyc ;9ency 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 yk0cpv d;t+2uy3(:jmv y,h mk with a 3.7-mH inductor for a resonant frequency of 10 ymyvjuvtc:p,+myk(h d302 k; 00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor a rv5qk 9qj961sonhgw(nd a 40-mH coil if the resonant frequency of the cir gjw 9sr956o1qqkv(nhcuit is to be 1000 Hz?

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