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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 flux thn; wk8 g73dfexcept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that z4z 7 tixh1s3-fbrwh.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 p(j: 3tpcm8lwt1m1fh zugh - *kroduces what kind of change on the indupt: 1hw zkuh jlct-fm813g*m( ced $emf$, 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 ov yqj * ks+*.n alg*hz1g/dk0wf wire produces what kik*snk/g.v aqy*zlh*1+0gjdw nd 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 produces what kind of chanhz l 9) l/5kols,nwb,kge on the indul9)wk lh ,n,kbsl 5z/oced $emf$, 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 *v85yh tiutzzfdsge .ii*5 0; from 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 wiluh6t/9yy rl 5ygy(l4z))kb*apr h,a xl be that which tends to produce which of the fo*/xy b gtl)4rly k(9,pua6 5r)yhzyhallowing 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 rcbmh2ai6ffx-,5tu ; above its center with its north pole pointing down. m,ha 26-f;5 bcr xiftu 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 held above itsnoe0vbp oit17h 8ak,) center with its north pole pointing down, and released. As it approaches the coil, the falling magnet hto1na7 p 0,i o)v8ekbinduces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field d f4ek0s1p,1 brno1vuvector points straight up. The magnetic field vanishes suddp1 dkvor e1,ub014nfsenly. 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 vivu b 7.jl+a;o5jtqc6 ector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as thea lqic7tj o 5b.6j+u;v 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 tjf9 ecfe/uz5.m 0qhn3op in a region where the magnetic field points straight down. The magnetic field disappears sudde.3hz05em cn juf/qe f9nly. When viewed from above, 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 ljfo o /h2h*pc mlmv uhpxv)69 .:n1ot)ies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewedo2opc )hjxfp)thl* 6m .1vhvm:o9n / u 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 enterinfjyg*q5pi1: c/edzf 6zmek7;3k f. ong first. As the north pole enters the wire, the induced current willpcf ynezf:5ioeq*6f;/j dk 1k g 37.zm 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 rotcdc vg- ph(xa4pg cpoc:j2; 9/ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight do(/ ajcx- g;pc 24hdgpvc9co: pwn, 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 constantmjy ,x*e0 e-mt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced *x -e ymj0mt,e$emf$ 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. ypkpc 7fo,.opo-w+s )
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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 thhy6p02 nugs r(( wts8exop: 6uat 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 ofao s8-cwz z3+ry61da magnetic 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 directt iyy)6.efq2psyk-5kfqs/ 9wion) is moved northward at constant velocity through a magnetic field thaqsys) w- y 26fq9.eytkf/kip5t 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 il02.p 7ep3d0vt sf bxconstant 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 trry.84* yg4 odgms c.mqansforms

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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 thrbj vyko8gg f(0p r9(n/ough 60 revolutions each second. The frequency of t/b y0fr8 k(( vp9nojgghe $emf$ 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 to:l8bj;/(sja r t2apwe

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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 dewbcbaj 9)bt ) troib 9/.ccmxll8j4- 2vice 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 more loop; zfb m1 2sb7ttjfk5p1s than the primary coil thenzk t711b sm t5pjb2f;f 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 contav)s*yq ab.tyd )06ipcins more loops than the secondary coil then cyy6)qp)d0b. viat s* 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 powewj 2nof+, y obgzv04z0r 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 c*vu v-n) :oehyircuit,

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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 r;49j j. utdbpare connected in series to an ideal battery of constant terminal voltage. At the momb r4j; tp.ud9jent 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 czszs r;-eyl3vjqo(va +3 78jof constant terminal voltage. At the moment contact is m j+za e(scvjysvr;l8q o3-z 37ade with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance Rxs9e /fc1uh*e tu5ek( 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 inductanceq0.nv4m j:5+vcw k hcw 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 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 dt6,8ho .2jec) eke9f1rb nbato a battery. The time constant for the circuit represents the tim6jtace8fd9e b,o)n.h eb k 21re 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 in series to a +.qo ;2xsmuba)d1 3qsahjo5lbattery. The battery is suddenly removed from the cixsla5 .a1s) 2;+ 3dum bohqojqrcuit. 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 2m+0pad-1m5l olerr a units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On t6)ies0 wqp2omhe y 1n6w08ng whis 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 supplyypae3 5;izl-(ce6t q2 .trb fh. In this circuit, the curren3 ft2hyzbc i6p 5.(;eqer-tla t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanatu8z /y :a63y,cj(ltjg 0 hmhce in an ac circuit changes by what factor when the frequency is tmt:ah,yjj6u/ 0h38 l(zat ycgripled?

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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, ;4 m,jk salz5ed8.nwathe inductive reactance of that ind85aze.nmdws k ;la4,juctor

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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 +*.9;8 wa-twfcc*qbtl rnm (pc*ki cgacross an inductor approaches zero, the inductive r tr ;lq w-*8*a( c. mkcip9tnb+ccg*fweactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In thioirn16 -b)vlazaqu.) s circuit, the currentl ua .)vqzbai16-r)o n

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factoy2o-i mcul; b1r when the frequency is tri bcyu ml12o;i-pled?

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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 approaci s,b3p9onw6s cgpz 1pl a65u0hes zero, the capacitive reactance of nwpczoupa bs96slp,1i306g 5that 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 b4 x4cncudu0 s)jma9*getween the voltages of the inductor and capacitor in a RLC serxgs0jd4a9c)u* u4c n mies 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 RLqqd -).5tu ot 2mgm;f7xkv c4g7ect+sC 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 impedance of the circuit increases if R in6g:qo3 mf v,mzcreases. When is this sta mz3o:6m vfgq,tement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the c2 qq,7fr. yvgbwmt:e) ircuit 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 incre3/ 9ztsqlay(gwf* vi:ases 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 d + iyqi 9wq2sw5(1hougouble in an LRC series circuit, the resonant frequency of that circuit wg1qw+hs5uo9qy2 i (i 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 volt*abl .,tiia+7ej ir0 rage. 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 ng1 2-.m0jf0kvub z hrcircuit 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 r+lga d )urn0.b n01t7b p*ujedadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the0ub1pnl7b0 ddnr tu + j.*gae) magnetic flux through the loop 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 :vgx e2d:te9w1x/ob nwo9i2 trotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planwxd99 ot v eo/te:2wx:bgn i21e of 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 radiu.qa5rd4p ;*vh/tz4nd 0iowv ns 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when5ti; wnv/p.nd * 4rvhq40za do 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 adjustablelqq; :r1 n ozbmx1com/)ac 63e single 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 fromls.8dx(48:w vd mitk/1 xpvir $4.0 \times 10^{-5} \; Wb$ 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.s 1fhr :b. lqy wd2//7uc+ph;bo+dujb A uniform magnetic field is appl :b l./ yh; dds +bq+oh2ub1fpjw/7rcuied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with (sl* u+g.yxv k) ya:he1wnps7 xk/kx:15 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 an:q a u+)o.9rc,nil wfud 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 horizontal.nw +q1s-t frwly at a location where the downwar+wwftq 1.- srnd 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 0oy ide*:au- d2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through oa*i-du 0deo :yne 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 n1pu(al j57 elcross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ar sd qo)vv,, mas(uh39bea $0.090 \; m^{2}$ 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 arma,7agk7jjx5h f,4 jw heture. 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 pehk 45j xej ,gwhj7,fa7rpendicular 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 of arij)c a86sv. j0gm2fukea $0.090 \; m^{2}$ 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 simpletu9k8j.z j5p8ca7ik*:bobc u AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field k 7: pzu8otu j5bja*8.kc9cbiof 0.050 T is available. If the area 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 generatxhnu(lq230/gsb fc1p or with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor oabk8td.col k2w88lu1perates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates onm um3qid (- pz5t pg64w+ov/zf 120 V AC, and when /zqmtv-5g df( wu3zm 4+ppi6orunning 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 md*8; -fxrurk* i8hl uresistance 6.0 W is connected to a 24-V power supply. The operating curri rhr-mx* kd8*ufu8 ;lent 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 conne2fz)6 mov09xx ku r7ii ;1bleucted to a 24-V power supply. The operating currentfo u2bvzml9k0ieuxr xi7) ;16 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 pdh6 3m(b*6f ;wx uzlriower supply. The operating current is 1.0 A at ful r 6fb* u(dizxl;6m3hwl 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 tos-iq6v9chn7de 5ze; /u.elr j 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 the seconcl+cu umpdxw na213 c, p2vx/2 o8-emrdary. How many turns are in the secondv 1dxn+lcu 2-8/2xwrop2,p cmucma3e ary?

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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 ma,0kmcxvo*dn 0+ zm 5rq/w5udu ny turns are necessary in a 110-V primary if the 24-V secondary has 100 turnsq5d c xvk w0 n5m/uurd+*0mz,o?

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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-tu z+83)vn; (/dief 0dh-uoyg v-iojmf prn primary coil and a 2000-turn secondary coil. Iffp vfv+ dy 0oi;8z3d-e hm(/u)ingoj- the current in the 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 the primary of a tranmn 2jb-ln883 hqb5ug:c1 jujpsformer. Assuming 100% efficiency, how many am8nqb1bcm5u2jhn- u j:glpj 83ps 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 transf6qsv *kv)m-r uormer provides 7500 V at 10.0 mA. The prim)kqsrm6u v *-vary coil operates 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 primz0,ne jy tm: +mdbf:v(ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pmd+ (nj ::zvb fmey,t0resent 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 tjow24w z ,j/ruurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in 2wor,w4/jjzu 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 turns. ye fwg )fzu0s hmo0)89 If the input current at them0)zwu8ge y hf 0fs)9o primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and i-tym0jayc2b 4 ts secondary has 200 turns. If the input y-mabyt 4jc 20voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns amxjtei d y3 3sm33m67 m)bbas2upbs9/nd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outps63 mbs 3tm7)jbeubpiad3 9ms 2 3xm/yut 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 iy) 8fci6c*dpwqc /vg9f6 8gx4h eu4 hstepped up to 450uh4i6 8i)*cfp89q/c4h vc6egy f gwx d0 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 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. Th4p5 ;iw ) (xcazre*4pb lnjk;xe voltage is usually stepped up to 4500 V by a transformer and trip wabxl 5zejnx4p(4;r; c)* kansmitted through 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 of current at 120 V. The voltage is usuall12wtd3 ehw5pnq q,ls7y 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 vn7pl5 ww hedqq2 ,1s3toltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has r*h hv76 del5q)wxb2ya 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 lineve2xry w6b) 5qd*hh7 l, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generfv865foc:e knd+ fjb* 7,k5yzom mt.x ator prd m75f k,nzf6j5. f+koyt8b: vec*omxoduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original 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 woul1podef c 78j73hn7s;tloqb.sp yw 9 4ud be lost if the power were transmitted at 3000 V instead of at 1000y778pch b3e;4dofs9.s 7qlnoj wpt 1u 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 b9*7ycgtc8 if86dbk a ss+ob4me 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 in9ykt 6bd scsf4+ 7o8m*icbg8a 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 storeakjv7 m43-xyt d in the coil's v-mjxt4k3 a7ymagnetic 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 gq-9k hq+tcwne;c2c is.b 5n+and an 18-H inductor. What is thi5+2gs k; cqn e9tcnchbwq.i-+s 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 voltage in an AC circuit where the rms voltage isw5xi63*ip po o8oc6s ( xr 12vlx6yeqo 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. What is rjm9s2)scq-f2a 0 qq8 aoyzli (n4+-cbfy/ fothe 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 outvfykq8 8b8sety pw0 g59kp9;7ncw ep/ let. What is the resistance of the lamp5nkyvgwty9 8c0w ;8 spbp97pe f/qek8?

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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 the pvl/:eebdh; f1 eak current through the resistor?f;1lh/e db e:v

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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 connecte*l ew )p(l3ucxd to a 120-V ac power supply. What is the power dissipac3)ewx(l lp u*ted 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 zxg0 y3 9f*hoj7ktse+a 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W,*u4 tc(z. i ix6afkm/exj x2e 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 r 1 q aj4by)hmyw+).g3e lho9egesistor 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 inducto:cw6t d;nar;yja *wo:r 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 o+(khf bg(u4igac uews+/ x:z0f a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a2i/z5a )q q gl7:l-w(ip8xa /wm lgfzs 14.0-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 necessar8s0s4 l,xs vvvckepb 4h97k.py for 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 a 6fu-t m349lr2wz czyb+x4 gr/0pvc6 ze0-mH inductor when 120 V AC at a frequency of 20 kHz is apwx 2 zzmucr -byr6lpv4fz g0ct394e+/plied 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 lir3,tz 4(9hr cxe g4/wbg3hi source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacito+ o+rpwdz- tms5z)btx+v33n yr 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 reafnsj fk kgcg2)9g) .t;ctance 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 capaci+cun22xiz g ;1wiqgrffs/ *y0tor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF cajqrvyy o .6.ixqwo,i8 v )drb54k, o3bpd(+oz pacitor be 100 W o3j(d.5kryqwrv ,64d o+o.ip ) biqz,vy8box?

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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 thropf 7udd5gz2qcsw+bv i/ ( 5qz* tvc-q/ugh a 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 wi59h av;pljkp5uj 5t o*th 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W5tlo5 5jp u javp*9h;k 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 17kk/ y9.lksyc94crvp ,r *p kh500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac kh yrccp/,sy 7*.9rl 4kkvp9kitor are connected 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 w ;birf 7n5tf7es3m0t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connew0teb ;f73 isrf7 t5nmcted 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 seriep4 )7v nzn)gm n4un.fvs with a 20-mH inductor, what is the impedance at 1000 Hp4fm g unvnn4.n))7 zvz?

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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 with2y9fhq-nnv 2pr +8nc k a 20-mH inductor, what is the phase angle at fh2knv2+ryn 89 qcn-p 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a seriea 2ra e1yl6z8,m*hdfd s circuit with a 20-mH coil and 1.0-mF capacitor for,zdh r dfeay2*a6l8m 1 a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed inz-e 3m; 1p.l5otl dgns ccf12x series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000-3. 12sl comlptcx5 zf ;gd1en 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 bekqet5f44ss6 f0 +lyew26yh t p put in series with a 450-mH inductor at 5000 Hz for a total 6ttlfyf +45shsp2y0ke46 q ewimpedance 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 putghrl 8 niw/r357ce su:vcd5n* in series with a 100-kW resistor at 1.0-MHz for a total impe8rvu *nnd 3 hsc:7rcg 5iew5/ldance 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-m k *wha9;)m/f rk6*vqpgf yhw1F capacitor. What is the impedance atm 9fyprvfg* *h )w hq1/k6awk; 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 withm)zf230n bfdvk e:n6 v a 10-mF capacitor at 1.0 kHz for a total imb 6mv:0zf k3)n2dn evfpedance 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 10-mF capacitor at o 7sw9ti eu)/m1.0 kHz for a phase angle oui/wm9e) t s7of $40^{\circ}$?

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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 sezt7 lo) o v.;k)h+wmhqries with a 30-W resistor at 1.0 kHz for a total impedanc); .vmh7l) hokz+q owte 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 inrlv u8u0o3ls2vk 52 rh series with a 100-mF capacitor at 120 Hz. What is the phase angle?hu3 lros8krl0 225v uv

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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 15l/d1)awok* 3ach)zmk00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec)1dmk/a * w)3kcozla hted in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and ae;xiwlh0 g0eks 6a,*;uzgls0( v (6 tiibwwq) 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Wh; g whgz(ibvk0xsw)i q 06l(e eual ;t0,i6s*wat 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, -mt*r/ rhmequ - x.up.a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What c-.qr p m/x.ut -r*uhmeurrent flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit kq/xqislb-b ;. .6/doeksl 3pnb j1i3 containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powplqkq3 6bkb i x.l.o/ s1ndie j-bs3;/er supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W bdnf764 ;qepkresistor for a phase angle of pb4e6d 7knq;f$40^{\circ}$ 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 jwa6ycv (acl*x- p1f; = 200-mH, C = 10.0 mF. At what frequency should the circuit be driva* lcj1pf -yx6;aw(vcen 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 W resist* y/cncc.i an7r9yuoa6ck5 o;ance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120- uoncr6*5iank 9 ccy. ao7c;/yV 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 8sw)+km i t3rjis $63^{\circ}$. 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 orl( v*t,7 t*jzp mxb41 gjzy4ef 60 W and a resistance of 30 W. What is tl,x4g41mj*ept7bj( tz ry zv *he 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 foro,era*q(,m6 n3bew gg a series RLC circuit containing a 50-W resistor, a 10-mF capacitgm,(g, ba3q n6o erew*or, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coia;zh-n ;d.3kf llgy)h l in series?h3;;h.dlgfk ny l-z a)

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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 4wov j rz +a9*wv3gtx27.7-mF capacitor for a resonant frequenc a*3vrgwzt92w xjov+7y 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 fr5z:8z xalev/ 1kmzh n;equency of 1000 /5:x;8lnzz evkz 1mhaHz?

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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 resisto 3 xkgft n) 97nw:r7n*gv+wdgor and a 40-mH coil if the resonant frequency of the circuit is to be 100n7ngvtwg)3gdk97nxo w f :*r+ 0 Hz?

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