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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fc2halh n z,9;hlux 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 u ;8qii odb 5(txwluagmx88 02states 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 e.4qky(. 1f pucso1 jkin a coil produces what kind of change on theskc14 uy f1.po.k qj(e induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a0rxxie* 6(t 2knxznj 7 loop of wire produces what kind of change ( z07ikn*xe2jnrt 6xx 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 tpuhebjcw; )*n fzbnf-2 -k71s*y9mom 9q*zwwire produces what kind of change on the indunzj z ktbq;*f eo7h- )9b nc2*1mpy9mu ws-fw*ced $emf$, 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 frooj wd i1+az)xpgxc 0w urt;*5c.* nox4m 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 or74qgd5c3pr conductor will be that which tends to produce which of the fo37r g5rp4doc qllowing 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 fwsjj0.1 - e-x lo8z-icbjmok+197 oy qp9ren above its center with its north pole pointing down. The stationary rofei1 x jcs807y--ml9 pk-enzj 9b+j.o1qowmagnet 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 held alrsm. ya x-4a9l.7xk bwfs4,sbove its center with its north pole pointing down, and released. As it approaches the coil, tf9 abkllss4 sr.4x-x,.a7 wymhe falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magg5 zqo:q*l ,w z7q-frnnetic field vector points straight up. The magnetic fielzo :z-rfng, qlwq *q75d 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 fiel pv.ez+yjv8d: d vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in v8 +.yj:vepzdthis 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 t xp(g 6ueoeea7 9 s8xvzz+.q*yop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from 8sezex 9vygo.+q*7z(ap 6eu xabove, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an eve,yo 9plf 94khnr-increasing current northward.loyk4n,hp9 9f Two coils 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 p)*l906;y9 viy bp7rslrf8n;k syjm kxole entering first. As the north yn* 8 fr k;6pkyj ;sviblly9)7m9s0rxpole 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 rot vg,ek,)i/bx xated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation ebv,xigk x /,)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 spdfrepbz-:-( d jk7m8 gn ul-t;eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, e fn-b(tz u7-mpljddrg k:;8- 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.um72n 820toeq 4po ,mvgrbg+s4g eg r3
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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 th7g 4k+e4 jqzdivs2rm5 (aex/ b/oswxktq )z61at 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 magnetieh61sd,t:7jrqoz u9bn + wzj ;c field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is m9*3 t1zl llwne, +7a qf7bpsehoved northward at constant velocity through a magnetic field that points straight down. Make a statement concerninlw*l93,1az7 h n+l 7bpsqf eetg 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 anguq3fc2nh w .oer(3ii d5lar 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 transforbmlrv+x54 w ao6k 7u/xms

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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 secoghvv 2q-fz5-tqr2dyb,: )fdt8fk x(k nd. The frequency of tz df8d2):-tfk,t(5 bq2-qh gkvyfx rv he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used(k tgh50/gkqj 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 devi;lp utsa;b4)v+ .wk r9t gxm0 och(mg1ce 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 secondary coil contains mo th8a8o3qj k;xs t3pd*re loops than the primary coil ka3q*dh x 8tpos8jt;3then 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 secondary coiy9*v(ok/kn5oz )hjl 8w 7bp qwl then itwk wjvqo)8pb7h*5 zno /9yl(k 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 pownwyq+jwp :xjl i1co e:q 918r8er 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 resonantwcy y-coy;u+p e.f 32u -2mxwh 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 indubm0g.la h3 *1td/issm ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contac sgda 3*t0m1.ibs/h mlt 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 inducx75l iszw54 olod3q q1tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, 4 o3z 1i5qsd o7qlxlw5the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and rb g0t;azo0pj*b zg4ptp5e d,/esistance 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 conne, 0 qkx :,iexsjt g+ 8vt.ep:iwq95jobcted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time c r.rcm.xp(y93(gu 8x 4mbf(xi* rfckuonstant for the circuit represents thym(4*bgfp.m(83frcik .9 u x( xrucxre 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 coxx 5/ye x: c-/mwl k(6m2lsbthnnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit rse/lbwl2-hxx5ktc: xm/ym6( epresents 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 excy)oz v- -f7oozept:

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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 supplq*d6ycjw9a f yb+k2we4gj(ge f s1 /s7y. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, i/wfof2f nj owgz ev:-c qa*1ie (h4:3the currenojzg/iac1w(e2fqife4o* v3f n- :h :wt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when thbj5p3*emfa mnp 3 v arl7-+lctl77ac0e frequency is triplev3tj7l0nmmf7c -c*ape+ba 7l3pa l r5d?

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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 bw1kojy 1mmk4 5yf3b0rv i:-ris doubled, the inductive ob:rb-3rmjy0yk45f1 m w vk1ireactance 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 z)7 .np 2+r agi, jcess(ebb8fkero, the inductive reactance of tha .is e 2+jcb spa8b7,rk)eg(fnt 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 cirb7w+b: j5f y (lt;(z sveeq:lq*h 0hsdm/tme 8cuit, the current( : s(lj8 bzvhe075t/h;w b*:meqqy+ flts dem

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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 ahg;73) pefo;lmoo qywzb;i8sz* bk 99n ac circuit changes by what factor when the frequency is tripledq y)esohik; po; bz8m;gf9 w9z*l3 ob7?

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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 voltaoo88nt e 8ow;ege across a capacitor approaches zero, the capacitive reactance of that ca t8neeo ow8o8;pacitor

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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 capacitor +ui-fgfip5kzqt;a m*jn 0 by 6i2bad:g9oh59in a RLC stbh- ib*io5z 2+u9mfaj ;dqp i6agnk:y059gferies 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 def,lvl bsqrs6,di( g ;rbo/p9a-ined 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 thi1f26 m 2tl znmx++nono8nk)w e circuit increases if R increases. When k6+ fm)t+wox m1 2n2io lznn8nis this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The im 0j *s6m ()pjmnryd1x(wej5s vpedance 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 circoqptzc6v g )2/9khslr. :(dy nuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in anx hnmj4e,e,7fiwn + r3g orl2*2cbh;e LRC series circuit, the resonant frequency of t xh n2 rr,w+*3me4eneo,hclij;72bg fhat 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 voltage.bm/ 4p v4*edqjo59gnl 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 cubd 7h- 9iv2nef1g 9nfircuit 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 fiec5quc6uhs55zz +si h 7.r8 fhmld of 0.20 T. Find the magnetic flux through the loop w5c6s8qhrc suzu h 7 fhi.m+5z5hen 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 mage )ogkbudrpa b-7-zun -la:6 .netic field of 0.20 T. Find the magnetic flux through the loop when the plane oru e n7o-6-. :baklga)zbdu- pf the loop 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 i k:ka26qxi fgf en,;.1;g+hakizoep+ s rotating in a uniform magnetic field of 0.20 T. aikq+ih ,6f1og:kxn ;g e;ef 2.kzpa+Find the magnetic flux 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 single loop is 1l,* fj(p vy atlc5tli3.;dat 5yoty)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 fromr; s5seb0 .da2b *zsjj $4.0 \times 10^{-5} \; Wb$ 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 n2:j1j) nwblayxa 37t. 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 in n 1t2a3y:)anxbwlj j7duced $emf$.

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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 turn ma8wou t nw s)0dnb:1(i9qp3ws 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 anddd3a ;j.bwj3v 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 whw*q8rey(6ex.hyv g 5r /un22ifad- oeere the downward component of the Earth's magnetiyq2ge/o fw(-2h*u xa8vr6r.d5 ee ynic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular veloci()mj6fx k+wh sty of 2.0 rad/s abou6 +hfj s)m(xwkt a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectiom+. muav0h6*j9tbw lm nal 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 ov 3aoa4 n)7xx lcevw*/+p+w anf area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 ca in4 s 4km-rl8du95ynr.4 lxoqgz0vqp+ ;2f 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 perpendicular to the axis of rota.;l-qr9v+4mryuxpk58 42z4 q sn0oad cf nigltion, 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 y p1 cm gp.:j/+ci6wga100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC genew8o17d jlci(eu n4u+qrator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area o1jiuw8n4dl+( 7 e ocquf 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 with a maxrbzcub*3:x9rh lg,5k imum $emf$ 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 mot)z l 4howi b(6:idyvq-or 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 resistance8gb)wgsgr5m,t 4 r: ds of 6.00 W. The motor operates on 120 V AC, and when running at full :4rt 5mrw,g)8dsgb gsspeed 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 resistance 6.0 W is connected to a 24-V power sui)mgq*mkq ohfu 3x/)6pply. The operating current is 1.0 A. What is the start-up curren h/)guo mif3k)qxq6* mt?

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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 24-V power supyaws:czdda(*s ry .* 2ply. The operating current is 1.0 A at full spe(:r**s.za2caydsyd wed. 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 pcw(3w cvh( 3ojower supply. The operating current is 3(w( j3ccwoh v1.0 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 hd;4m , ia;8oaxduig;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 wbfq l3r*x: gylo4le q1 h;w,+to flow in the secondary. How many tuqo3xr ;e*1,+ h: q bl4wywflglrns 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 j 8),enhe5jj mmany turns are necessary in a 110-V primary if the 24-V se5hmj)n ,ej 8ejcondary 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 pr2c vic15adu1z is:.(lzfa 6 uvimary coil and a 2000-turn secondary coil. If the current in thcl 1d1f(s a:.uvzzvc ai u5i62e secondary 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 b*f. b eid41k 8iegw hl,pmt12the primary of a transformer. Assuming 100% efficiency, how manfw2eip,lg db4he8mkb . *ti1 1y amps 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 a neon sign transformer provides 7500 V at 10.0 mfg-hhr 77po fy ydwkt-z)e +*(A. The primary coil operates on 120 V. What does the primaryhd-grzy+p ye(to)-7fk 7w* hf 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 coiaace f )2;.mqwltmf70z )3mqfl and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primam2q0 )m;am7 zf f3a.e wfltcq)ry, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary ooyyzh:2d:r8(pad f-coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presdf2d8z-or( :: ha poyyent 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 transfo j w 8iau576yfu/ayk;irmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the ou5i 6u/87a yay jkfui;wtput 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 second5u)vhxtg32c kjsw9m* ary has 200 turns. If the input voltage to the primary is 100 V, we cam 29)u3hkwg 5 *sxvctjn 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 secondq+j-r hmb0zo9cz8 2qkary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional -kjo+bmh089qrzzqc 2losses)

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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 volt s98kqnz- :yjiage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns zq:8yki snj9- in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. r b5-0hi m.tns,0 oehdnbz17pThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fb is75h0od bpn nh.rz-,1m0t eind 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 st8ins* zid *x+3bwhlq*epped up to 4500 V by ai3h** i+dxwq8s nb zl* 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 stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line k oxf;m;8)sfm 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a traofsxmf;k;)m8 nsformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ge**n.mo vp c(2-ai fhqanerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stavf qoa(p cm.i2 h-n**epped 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-W6g d/h+psrhc) r:of: vtl+h (p line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V?:/h:ftlp6 h+os+dvcrp )h g(r

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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 br6 a..:t qj ;m;zxkzeze transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the originaj6az;m: .x .rqzet ;kzl 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 h7;i; dh3zhh renergy is stored in the coil's magnetic f7hhzh;; 3r dhiield?

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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 resi hll7-:rbe0n jwaey .b/iht0- stor and an 18-H inductor. What is thisb0n /7- ehb eti -yhrja:l.w0l circuit'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 voltagy(9prgg n06l xylkw* 2s 7a4ije in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whatxs/g l1hhup / m26e,ya 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 ozj+gkq *r cd*4f the lamp?cgjz q+*d4*rk

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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 cop9x0 vqfp:/y 1* tqhk7:w arwonnected to a 120-V ac power supply. What is the peak current through twoq p1h/0f qyt9kwr:7: *vapx he 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-ugm75coo6 635viva*xi k m uu7v*tbo(V ac power supply. What is the power dissipated inct67vu(a7mxgouoi5 63 * uv*bm 5vkoi the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 8uooc) j ffp fh (*r7x,n zqda4)r:*sxis $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i*ldurt ncnczp) ;y(.ih:pdi20yp 4 2is $I = 0.80 \sin (240 t)$. 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 50ohuxpo zi )74;-W 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 60 Hzi .rm tfki ,;dxv 2t90/gfyt:h5fgt c/?

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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 coir72*orojt9mfop p. 8h(h l0jm3f2x m hl 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 co )t7nw2 ;dy/ td t5:+ocpr p6la m-rb9bj3wgrwil 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 fb/ b)9alqmrm/ or 157 W of inductive 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 az1 ;ophx w/za-js:fq7 60-mH inductor when 120 V AC at a frequency of 20 kHz is applie-qs/ pz;w71o fa:xz hjd to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source?,w7ti;- qofuj

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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 ag h .+nzcde, hz59b.nht 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 10:sjqz0o ,i9kr n:5 us )ki3okr 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 reaj7 :6, w,y is6vv er6ocvyncr8ctance 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 czc1 ,ue8i utjzv-ax;6 apacitive reactance of a 0.010-mF capacitor be 100 W?ajz; e8t1vuzu -6ci ,x

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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 a46aciaft6 asn / ,zouha: 1g3l 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W ruosn iy:,5mu* h+g l*inductive reactan:5groi u u*hymsl+,n*ce, 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 impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-2tjz9x o jyqlg9 3m7tubb /kuqb)ph) jqh1)+-mF capacitor are connected yj t 2gzq1bxbj9 o3b) qqj7pu -/mh9h)tlu+ k)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((s lj+i3bm.tp6b0q:qw hrhsm )*n sycl3b a 2 coil, and 1.0-mF capacitor are connected ri32 ) jabcphs.0(q6smlw+l(b q by* tm:h3snin series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductorskhdfhqmz.fk;6r1 c-u pj th3j4l(4 :, what is the impedance at 106u cq.mhdhr;( js 44k1l-kt jfz:f3p h00 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what u,iyi)zfg4th 2 h)go- is the phase angle at 100u)yi-ghotifz 2,g4h) 0 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 .ti* vox7/ 8ukzyc.(kf8kv wwcircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 10kfzyi.tw7k w (. kcu/vov*8x8 0 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 res (0ojk u3hlje/istor and 15-mH coil to get a total impedance of 110 W at 200(k/hjl o3 j0eu0 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz fo up5c397xldacg o63u gr a total imgug6xpaoc l9c3 75u d3pedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resist8 b3s:-hyo n1wiyjv -jor at 1.0-MHz for a total v3yso ij1 wj-:-hn8by impedance 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 tlf z-+ks9 jg-qhe impedans-lg 9zj f+-qkce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a t .cu:b46whzk hotal impedance of 44:cw kz6h hbu.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 nee26kfs+s dh75r) xadcsded in series with a 10-mF capacitor at 1.0 kHz for a phase angle ofs26s)ca x 5rd+s7hfk d $40^{\circ}$?

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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 serlbo+ ), h2ecomau h12wies with a 30-W resistor at 1.0 kHz for a total impeda2+)wc oh1auh 2elm ob,nce 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 dy;cd d).1:(bz b mbjn100-mF capacitor at 120 Hz. What is the phasmd;: )d 1jcnbbzdb(.ye 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 1z5-8fz1 b duga00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serbgf -azzu8 15dies?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a qd4s(ftod5k 8lr+ c 6irpn; r*0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current ink6c(*; rdpr+o flt48dr5 sinq the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and z2ow fcza 5*-kan inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows k2 zo5zwcfa*-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 ang88kbx/x 2pl*aqoeap 9 le for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to298 /8oxab*xl ppeq ka 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 -xsr0 vyziah)2h9v 8tseries with a 500-W resistor for a phase angle of 29h)iyvs8rx-h zvat 0 $40^{\circ}$ 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) j35s+9jr* j phh;khae7 b,dkhbkf( i.0 W, L = 200-mH, C = 10.0 mF. At what frequencyjs;(j3j 5h hfk)k+hh db ki*er ,p9ba7 should 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;bs5.mk.tux:3dsj(k ax ub 8a an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cir k;.sjmt3b5u:k( bx.sxaau 8dcuit 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 circuit isa;hh;-p o tq )ynf a bq7h(o+4lid11yf $63^{\circ}$. 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 of 30 W. What i*6ca1qzx d qg-s the power6azg1q* d-xc q 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 RLCy3v-p ywb- l3 8apm/hnmca2y) circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu-m-yl3yh) np2wp3m /cy av8abctor, 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 frequenehq *:hvt2*gxb dsb6.cy of a 1.0-mF capacitor and a 15-mH coil in series?b v6g*xh. q t*b:hse2d

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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 fm 49gbg-ci, ubsqw60bor a resonant frequency ofgbmsw q4 6biub9c-0, g 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 seriewyytxpsj +z uqu(u/x*/e( /5zs with a 3.7-mH inductor for a resonant frequency oxwp (/y/xys/*q 5(utue+uz j zf 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resist1hxy nme(+u)ky- lry :irv,3 yor and a 40-mH coil if the resonant frequencyimkryx+1l),h : une(yyr3-y v of the circuit is to be 1000 Hz?

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