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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 du*qg1fwzlxr+. a 6 (yflux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the vek m/zyg0wdana01 c,1 5e*i g$emf$ 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 o+ gsya5 pmi3z3f loops of wire in a coil produces what kind of change on the ind i3p3m 5zyasg+uced $emf$, 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 thi/(e 6a*6fhrcckwt* prough a loop of wire produces what kind of change on r*ep hw6faicc6/(t *kthe 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 wir9af80 swaz5 tde produces what kind of change on the inducedtda5f 9w0sz a8 $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a jd3sxp5wjo -,uxa j 0 qjc---m8ld3bx 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 directee2kv5xi/n av,sz1r 1gv.3 mhion of an induced current in a conductor will be that which tends to produce which of the followingz v5saei.mr1 2h3vv ,1kgx/en 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 tablg7r6ut-b ;c dm3i ez8lt+/o -i zq6fpae. A bar magnet is held above its rumb7fct-z/z tio+agd -6pi8 63elq;center with its north pole pointing 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. xzqm 3: -dz xp0mxvtb ;m)(1ko A bar magnet is held above its centex10;xtompkq (xb3md -)zvmz: r with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectorg78usuz tmmc nk+t2o/s *; kp, ;g-ocr points straight up. The magnetic field zmc-ot +* g;mtk;kr 7scs8n /uogup2,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+6u )(yzccl ap in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from abovc cl+(p uyz)6ae, 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 a horizontal taa;3 qm;rurz)rble top in a region where the magnetic field points stra r; rr)aum3q;zight down. The magnetic field disappears suddenly. 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 lies onxzc-/9t6 5abilka/h n a horizontal table and carries an ever-increasing current northward. Th/ztb-kc x5l/ana9 6iwo 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 popsnn qjp/ rnq,2p,/7ole entering first. As the north polpq/snqp2r po,n,n7/j e 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 rotawrktq a6f *nuc0z(/ ;wted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetiacz*kw6rt f uw(/n;0qc 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 wir(tu8ucp80yj yt1, xvze is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what ,xz0jt ycvput (y8 8u1must 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.ngxm1ko- d k5btl;11t
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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 t6p5(lpl n( s-kxuwz0dhat 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 zssaa:pq1 iz(wd ,2 (tlf 0-hamagnetic 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 (orix+bn: plo,o4tj-rln-vzaz*5m, - x vjented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentiaxljm tr -vnjzv5-,nl* :,z - obxo+4pal 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 a+qgn/cmr( (rv 9x;yiat a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatoyv0j6m z((ki4wo 9s fhr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through fa d;y88s5n cok;7y 3a j-*ou8ud+utf3ftj xk60 revolutions each second. The frequency of the7o kfjxtdu cfd+ 38 aa3j ufy5y8t-8s;;*uok n $emf$ 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 devicef4-i ,pkre zp-dgf9c+ 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 t n,qp +w,zbwa)hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if3y 9v,j(/qo0ceevrn ko4v hg2 the secondary coil contains more loops than the primary coil then it is qh v3gv (9eokeyrn20v4o, / jca

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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 hn-l,87 +geynv ) r5ds. zflokthan the secondary coilfg7z5eynn v+,-.8 oshlr)k dl then 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 pbru69m:9 rvt/akfw p )ower 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 ciy8xgc0tm*ac ,l h; 2o2 hac9fjrcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an id+f3.n 0 vw/pfjjbjx, xeal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the res 3njjf/.,0wx+jfvx b pistor 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 1ab,id9vjr4e s(dg t ,to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across t(1bs4,deav j idtg,9r he 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 *.9ia;un/xf/gbo iaib r.pb 3resistance 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 res opu j83x64coyistance 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 to a batteexunpc:y ,tzg-8* o(t bq+yn-ry. The time constant for the circuit represents the time required for the current to *+z,x yt u(gcpnqoe-nb yt-8: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 connev/ s jm0++boshcted in series to a battery. The battery is suddenly removed from the circuit. mso+h /vb+s 0jThe 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 except:,fq1 ofg07 utw3emjp 8

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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 cm3f x5q t:bk,vircuit, 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 pp,k1 *j wvrxd p5b3u7circuit, the currentb51p3v kx,j7pdw *pur

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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 b r 4g7 knyzvzw+ugyw1v0ktvm5,nq ;:( y what factor when the frequenn,vztk :guwg ; (5ykw07mzv+yv4rnq1cy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the i )h2qn*yjm-/t7+ljszjo.ui inductive reactance of that inducto/oi mq- zhjj2ns 7ly+*)ij.utr

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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 vn*r+o0 la m-oq ctv1 2mou+qh.jy66 b aql4tz2oltage across an inductor approaches zero, the inductive reactance of that coil m b0y-2 r .oalc+om2+ qtnl6za6*ohjutqq41v

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, trlk:ak5jq; d9ii krl7t l 6f00he currend5rr6iaqtkkl:if l; 09jk7l 0t

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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 cd+7i6g v ,ee-bc0 ouluhanges by what factor when the frequency is triplebeiedolv7-+ cu0u 6g ,d?

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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 s9 1/gznjdfao7+a8hm capacitor approaches zero, the capacitive reactance of that capacitof/mag9hsoz n7daj 81+ r

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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 induc5 0vm*epr1 wostor and capacitor in a RLC s0 w5*remv1poseries 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 is0(faey e a/luz)lf 2/d 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 fv4 kge1/)rfbd2twku2p7 :l fimpedance of the circuit increases if R increases. When is this fbf v/ k17pkwde 2)f:ul24gt rstatement 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 circuit increajsyv ewf2/.s l-/ qbue/q8ll:g0n xt 1ses 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 i xhq +9u+rot.ampedance of the circuit 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 an LRC seriesc9451 evvmk yt circuit, the resonant v94t 5yv1ek cmfrequency of that 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 wlvlw/h.uu 66n 9, we;ez2zbvis driven by an AC applied 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 circuit occurs whenie8:vg 5zl)kemn 85th

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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+g0eod8i .w,au2 yamdf pa)/88hdjfm 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the l0 em) a.a8w8gyu+afo,28dpi hdj/ df moop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field ooq f0tnq+j uht*p;utp 0 e7+6sf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector aretuoen;*+q qs70j6tputfp 0+h 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 0.11uo 8v2 ahjo/jy4zrpq- wf m: s,syq/10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux througv 1s1yu,842hzo:ja-qfw pqojmy // sr h 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 adjusta 42vhy 3br7qpqble 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 chan8 bca c2(n/iwtn .l l c)vt;j6/d7cjmiges from $4.0 \times 10^{-5} \; Wb$ 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 5sqg)ovb7)po76xk z3 ylbonk x ;6fr 6on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformoovyf7b rpgk ) nqb;zxk5o 6x 6s36l)7ly 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 wx:tw cofr6mq(( t d5g- ing/)p6)ogwqith 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 and area 4uhcuocp bq+t23*st+ p0m*x-vu di4y $0.20 \; m^{2}$ 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 whered 4x,l e,pjws3yd+ 4sn the downward component of the Eart4ws4, j,y3l pxns +ddeh'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 2.0 m long rotates at a constant angular wmq l txg1,;j8velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fieldt8 jx l,g1m;wq 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 18b f97y kkc5,iwaxljhas 50 loops and a cross-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 turp0 e- o4n5kpowns 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 $emf$.

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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.)-hnv: ljy qyl g+v3x/+ htrs 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, wh s.nrytyl:+v3h)xj-q gvh+ l/ich 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 of ar jp-./vf-d waqea $0.090 \; m^{2}$ 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 a8vc+ g,v fcna8 simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic a8,vcn v8c+gf field of 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 generator with a maximu rmzp0g9)1m qpm $emf$ 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,lk3eyd)ppp4zh v -m09fodn4 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. Thezkc5lq 7wl1z4 motor operates on 120 V AC, al kzcqlw5 z147nd when running 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 resistance 6.0 W is connected t;2bmn w9ha1 ydo a 24-V power supply. Thh9 d y;a2w1bnme operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected z6aan7s-s4 twj1b3 (plm8z eu to a 24-V power supply. The operating current is 1.0 A at1 et 3- pa6(zbwsl a4u7nm8sjz 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/rz0ejjs qcc/h, n vtb+-7dx5.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full sbt - czvcds//q5x0 j7rne+,jhpeed. 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 red ;k) 5d*mvugfmcphm 9a7) bb/puce 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 transfoyywx;g7y h7pr3/0 w/vj cfm/k rmer causes 14 A to flow in the secondary. How many turns are ;/c 0jy/wf wvhk7ymgrp3/7 y xin 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 turns are necessary in a 110-V primary if t( zdwzdsgy;47 he 24-V secondadwzs;g d7zy 4(ry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secon)elu r c0)k:yb4ivi;jdary coil. If the current in the secondary is 3.0 A, what is the current in the u ieb)cl40)r :y; ivkjprimary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effpbdbn7w726 hnr-eqku: e 4g-hiciency, how many amps at 24 V can-nu7r- ehep hnwb6 72 qd4:kgb 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 .my duu+ttg jbyw*: r4e 3q-/2w7giq g7500 V at 10.0 mA. The primary coil operates on 1/ dj2g3yi+w*qt7 4 ube:.g w-tymgqur20 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 qjo -7+aq7x9xyo 0vq )l*jlpnnqg-)a its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primaogaox7 +-j*-0a79)yq l vxjnqqnlq p)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 vcjxm-k4v *2o on its primary coil and 300 turns on its secon 2kojcm-*xv4v dary coil. 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 tra synp mqx96x(3kes::hnsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 10xqk:s ne93 :x6ysh (mp0 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 seconda,9sid5/qtcqq 9z uw.;r. 8 pw(lhanmdry has 200 turns. If the input voltage to the pri/it.hlcd 9w.9 ra,(5zmu 8w;qqnsqdpmary 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 and its secon,kgl u2s2l 4ooyb*; hndary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negleckyh;4*b2 l2olgsun ,oting 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. mqeh6bv:ma 77 The voltage is usually stepped up to 4500 V by a transformer and transmib va67m7qmhe: tted 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 1 j)hx+m -(ls7v-rypm0tbm6 ly 20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thlm xjm7spv+l)0-( r6t -yymb hrough 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 at35gf-l nqc 2r7 weeiy: 120 V. The voltage is usually stepped up to 4500 V bq3i:5e7yrn gf 2w- lecy a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not 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 a total resistance of p . uzyn+ns9h,x,/r ri0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss z syn/i9 +up,.nr,h xrdue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. b v: rm34 v)c.w0r9p:3pw9jylbqdm qw A generator produces 100 V at 70 A. In order to reduce energy3)dc mbj4q3q: vv:b yp9lrww r.w09mp 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 ajp 58 r0+rpqkevu7q h2au5ll;t 1000 V. How much less power would be lost if the power were avrjrhkq7e 55u8;q 0p+ pllu2transmitted 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 qj.f59axn1 ip on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tran n9pfaiqx 1j.5sformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current bic,q38; skxjlc+uya 39r/2i w1fn t kof 5.0 A. How much energy is stored in the coil's magnetiay38cfkt c 31nukbx+ qwjrii l9;s/,2c 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 resistolpy/ iuxf*0x 9r and an 18-H inductor. What is this circuit's time const9xu0 ip/ fy*lxant?

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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 *.t-i jqkg 4 tz,ld9lbeutk3.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.kb iqm 6l z5zwufa+:f6 1qqr/d, bl3r. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the re8(j0tnqg-h m5ct* gp qsistance of the lam5g *npc(-tqtj mgqh 80p?

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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 luvo/8a i.h* uf1 5fpj* xleu-j ,1tnmthe peak current through /au j18unoxv*f mh*.u ,1f- e tjll5ipthe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powerypwt),vx n(8djw +jd) supply. What is the power dissipatedjtw, 8 +yd )jdnv)(wxp in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is n;di19el;y3cq a oh+ c$I = 0.80 \sin (240 t)$. 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 res .02m0tl3aybc ; 0alwyhq q9wgistor 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 resie(8derzm;6 vkbqx//h stor 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 ofogg7(hy cx5 k5 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 2.508s x wt7.b*u((tm kekt-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coiz6 /jlc -u7kgjl have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at xjf+z;nj ;o1l3 sp3uxfv( nbc1 hm2z 21000 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 wh esp m(/fq16evu8oog,en 120 V AC at a frequency of 20 kHz is applgmefusv,(6opq1e o /8ied 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 sou5zgsz(ld 8eq 34 yghl;rce?

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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 a/qgv8 tiox :ha8:4pu yt 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 zmj-: 2d i35r n1udmk 9ttpkh+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 capacitors*-r,0 zga 0wafhnj40 fm s8xx 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 capacit 3bjoo+ jta 1*jaa,.hwor be 100 W? abtjj.o1o+a3h jaw*,

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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 aowe(d,apq,.-1fb us*sb4+ xg ql0fa y 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 circuv(xay: /peok2 it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reack/2:pao y(xvetance?

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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 resisto8/pi ziqm8b*le qd,f1r, 20-mH coil, and 1.0-mF capacitor are conn/q,m*elb1 i8 8zdpiq fected 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 150m r4u*l*u:y es*wf*ed0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacito :syw*du l efmu**4er*r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series *w,oamtay jik9c qj69thg4 3; with a 20-mH inductor, what is the impedance at 1000 H*at4i , tmya 9q6cjhj3w;ogk9z?

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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 3 bvv* ow;/ wn ze6ej/cvzv0n/*qu)tx is the phase anglene)nvjbv/t w 06vo 3* cz/qwz uv/x*e; at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series d44e*v c1tr9psem7u r:jy-o mcircuit with a 20-mH coil and 1.0-mF capacitor for a total impedancsd4c4vy- : 7ump*9me rj1toree 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 yu -wnjo2lx6 k2 xge 4tjw)xaq -,z4x9in series with a 100-W resistor and 15-mH coil to get a total impedaklx tz 9jq-2 -e 4jwyw 2ou),ga4xx6nxnce of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-7xh 6nv;y/s 0dib8biwmH inductor at 5000 Hz for a total impedancex6hsib70 /; dynw8 vib 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 resistorc2rd ufyhh m* e5:4i(0q0ttih at 1.0-MHz for a total impedance of 150 rf*m:4ti05 ue2h(d thhc i qy0kW?

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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 ii vv5wi.tb/ap:(m0d-mF capacitor. What is the impedance at 1000 5i(. t:/dv wpibam0 ivHz?

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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 capa 6 x:;g)9tyu pjfyy(zscitor at 1.0 kHz for a total impedanc y;y6s zfxuj)p(9:y tge 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 1.0 kHz fcwy.oznprvt,:c2he5 zq69 j6ddj: ndf.( r o(or a phase angle o2o9:crcd5p .h6(zwj , or zjnqd6(:f d e.yvntf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needekko .le+;n hi2d in series with a 30-W resistor at 1.0 kHz for a total+ in e;h2.okkl impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. W1a3 /rae5m, c+fxdvwohat is the phasr dmeaa1+/,wfvxco35 e 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 150isa-:y 7)n qpwlgpqnsm7 ;fj:. u69t v5)bxco0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sesl.)qypn c5xqi6 m)fb::7 -jg nvws ut;7po9 aries?

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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 c9l2 wu cgu7nu :lf (pf(f4,yxiapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz pou:uf(f4(ll2f g7,ixc9 wuynpwer 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 reactance 30 W, and an inductottl(av. 7 3odkop:yg(dt k /z9r of inductive reactance 30 o pd.79v:ak dt3oytl/t(z kg(W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cir k2sp)zbn2ocoex (rr4625 jtxcuit containing a 50-W resistor, a 10-mF ce o)zs2(oc j2nt xbp2 4xrr6k5apacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for co .:hpr)+b evksx: *0i7sueeau*l f 1a phase angle op:)u l:k*fheb e 7u.csr as +10ix*voef $40^{\circ}$ 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 = 10k 7tvrava6;gk1zx n) 3.0 mF. At what frequency should the circuit be driven in ) 3gn;r6a xvakvk7z 1torder 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 7fm:: hc+iev g12.0 W resistance, 15.0 W inductive reactance, andim :gv+ef h7:c 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circkj 1bq:a-. mcg7c eoaut7lw. 3uit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W ide;;drfd l4ob x*(( yand a resistance of 30 W. What is thdo*;(yd x(i 4fd;berle power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing .s5t d,a(-gjo vnavq ,a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po(g,. dnavvo s-t,jqa5 wer 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 a-r oh2 a43emyund a 15-mH coil in series?-ay4o mehr u23

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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 a2y(nuew6)ds p(lkmm9fn8e,-mF capacitor for a resonant freque s6m),8m ynpdwe2fk9e (naul(ncy 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 fo3cw:k 8agz om6r a resonant frequenca:gk38cw oz 6my of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W re fmau2fb/g7elws:6chk k7fb/ya -u :) sistor and a 40-mH coil if the resonant frequency of t h)b7/ 6se uag-lfwycb:/k fk :f7uam2he circuit is to be 1000 Hz?

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