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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 fcambi7op+0oe/xyjxa r3m+x,1 ( 4ond lux 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 o++ht1 ;7u:et nvplrm/+ lio*pz vbj+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 op+e; *kk 8mimwire in a coil produces what kind of change on the inm ek* 8km;o+piduced $emf$, 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 lo- h4-2sjsyy snkwis1*op of wire produces what kind of cha 2*i4j kssyy wsn-h1-snge 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 wirgr;h) yqesjf.1diemd5q k7(:e produces what kind of change on the induceddg)ei5: s1jyfqd(.;qh7e rkm $emf$, 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 magnetic fsotvp/ 90n:w ln 6vhh1ield 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 curregyy-jwe sk+ ,4nt in a conductor will be that which tends to produce which of the folge-,+4wjk syy lowing 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 magn kd4g9,d;b6j0oc*i2va h hyjiet is held above its center with its north pole pointing down. The stationary magnet induces (6v;,j2*o9d0a ydbic gkhjhi4when 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 t4 wekq+y ommn 2x-g:z(able. A bar magnet is held above its center with its north pole pointing down, and released. As it any:4o mxw-( e+gzmk2qpproaches 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 wherq:4h1 0k-ql edt 1ddhne the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,-dhk qd1h 4tq0 nd:le1 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 fie a:bvtu2 om1)eld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what 12vo et b:um)ais 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 table top in a w. pd0u7p t5l2svfzs8region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whpt8wvf0sdpuzs 7 25 l.at 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 ever-in57 nv5iryacp/creasing current northwav5a57ir nypc/rd. 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 zpj6b4 ivj4xp5xt9w p noy9 jz5j6*+.k)ni mywith the north pole entering first. As the north pole enters the wire, the induced current will be*5 z9v mj94niixjkbnyw5py.+6 tppo jjx46 )z (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 rot8) xasiez+.o) fgqa;o ated 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 oqexo f z)i s.a+8);agorientation 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 q( v )wv.2fduedrl55 econstant angular speed about an axis whose direction can be varied. 5vvuqde f ) dew5r2.(lIn 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 $emf$ 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.h pdr8r e -0y2az/hbb4
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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 that ana,d8* ,oh:ul)zc un im $emf$ 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 magnexud3v,5 z96nc3cdr hu tic 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 direx40 hh642jkk a: jabty 0byjw;ction) is moved northward at constant velocity through a magnetic field that poi42tjah 0yakkjy;x4hj 0bb6w:nts 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 constbwywy16g xr+ /ant 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 transformsxor(y.8ma29 o che yox,).x yw

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency l3gx 8go/fu(9 k+ 1s ee2plebus*w-df of the189u*+23/gb-k w effdosue lgepxl(s $emf$ 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 tg1n h( +p 2ffrdamp85h)(fzzjo

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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 th .,o9zh:rx5bp kds6qfat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prim8-)g *l mlfgbdary coil then it is a-8*lgb f)m gld

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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 contau rrh 78 qz5kk*we)a k0hh;me/q6jfq(ins more loops than the secondary coil then it h k 8(; h7u*0ze6rkw5me k/qfqarjhq) 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, theizqnk i2-y , 34 )/sz8jimbrrx power 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 resonantmg1ov/+3 egc* ( bhcslu) suj. circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of csn )nen -;.mt/p /azzeonstant terminal voltagemazp z/t- /e;.nns)ne. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor arebcp)o/pq*xnbxv: */p-y 7qoe 1pl 0gb connected in series to an ideal battery of constant terminal voltag*p0 l:bxp -b*ox p)7qy/bve oc1gpqn/e. At the moment contact is made 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 R/vv a.c4faku. 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 isz3*x :v owgfl* 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 battery. The timexvthgage ny(5lg,:7c: kql-d *3 . g uctvcq/+ constant for the circuit represents the time required.vdct n:ak ue q:c+ t3gl/7yg(h,5cgv*- glqx 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 battery. The battery iecjua j551gu0v/ /zy it)2u hfs suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to deyfi u/g5ejzvuj2)105h /tac ucrease 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 thvx 7du;hnc f6vui 6/4gh* xt:se same 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 supp55nxjn bu;eg0uf+s o9w a11k kly. 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 civwu - vo1: zwvf9f*y5kstzb at7+2ts 3ua0-bprcuit, the currenp s3-tb1z 7: t +tvfwvu20ozwvyk*f5 au- asb9t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance 3g(sv+ pq (cc8ccq nt05akw5a in an ac circuit changes by what factor when the frequency iska0nqcc(5v85wgq3+as ct( p c 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, theq )g dfw /:1c,twhpma9hjx*,m inductive reactance of that inductor)pam w9jwhf qht,gx cm :*,d1/

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, th9(l.(/r:csxd,*yriukqectt y; 1*u h xof 8qc e inductive reactance of that y; c,y ohr* 1e*/qf.tsuicl:qxrx(kc(t d89 ucoil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the cur;/ c6qe :fchkprenth/6e;cfq:k p c

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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 cha:;n6efzrg*69k,e lg4f-:n r fd;v vlm c dtbr9nges by what factor when the frequency g6 t-;nv9 efk dm*zevndr6c:f4 ,bl;:grlf 9 ris tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC hxbs,o uma*t yk5m+t 7/ 5cxle0l 7m*pvoltage across a capacitor approaches zero, the capacitive reactance of that capacitor5p+ctb ox7ls05t / mxka ,*7emml huy*

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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 th *b0v) d/mc 7ut57oy5f x uvrkws aylyoz453q(e inductor and capacitor in a RLC series (m uv5qdv4loucay f kso )3/xz 75 yw75yr*0tbcircuit?

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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 Rw( izng2(6)ye t/wfljLC 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/rkekox:t iq1t,37ur3 es 3hfa7l- sh increases. When is this stateme73,qs1st 7kelio -/x3h ru ahfe:kt3rnt 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 increasi4riabu xam qfa3i0m:i8f49 m)l4 i5wes 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 increasesu3nvdhya 7v2wra7/ q8 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 b/hnfp/p4u2c*z 4fq tloth double in an LRC series circuit, the resonant frequency of that cn/4*/t lfqfp2hu zp c4ircuit 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 vonm k w6;mkhybxa6l5+ 4ltage. 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 cirfo 9lw i p;2bl3dnoo0;cuit 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 *ul abe0r t:o :nje/do1yfx.aj/jb0 2a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane j:j oe0 1 lj b2e0axb*truynd:a//f.o 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 umu. e +zuyt50magnetic field of 0.20 T. Find the magnetic flux throzmu+.eyut0u 5ugh the loop when the plane 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 radius 0.10 m is rotating in a5q9 jt69lsa+tx9i nrc2rnge ,ienp . 5 uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of theci i rgp+te5nxl5er 2 s9n q6n,j9t9a. 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 reduced 6 /q) d5pan6rwicwn/e/:. bxtad9ul q 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 c5gb0 ,v f9dpatu w1fk/oil changes 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 turn)+zcohhfjqs 2 8xgb// s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, fi8qfx j +bso2/h hz/cg)nd the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area ii/v3ymh z ;i-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 aare. (w f2q+clrea $0.20 \; m^{2}$ 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 i8zb6h)fnc 7 lhorizontally at a location where the downward component of the E7b8nc 6h fi)zlarth'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 g1z)mohoc (x;is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis thm(o;cz) xog1 hrough 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 generato vnyoe+v60*fd4fwxe;r has 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 turns of wire of area 3kp6ynb )w5sljgre gte(61 i1$0.090 \; m^{2}$ 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 iszqa1r u,d b64b1u0ies 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 magnetic1z1u b6s4 udeba,q0ri field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of 9o 19;9nzmsx*hf pa rsza8cp3 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 c 0cc d4b;xmt-gonstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If th -mc0bxcgdt 4;e 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 generato :k eif)9. .)li a4vmgpw6nblor 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 opera7pyy*/xuo(l umcj03 c * s( ;cvvs8ttmtes 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 res,7v38n,rr2 m(hh ock ypw q42eih /ngoistance of 6.00 W. The motor operates on 120 V AC, and when running at full speeg 7om8ony /h ,khq2 cnw2(vrp4 3i,herd 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 powv t itp . 7eds6, csmzxmjf1;418g4detfx20oh er supply. The72pmh0e1 ejvdis.f , 86 ;c4gx1ozmf stdt 4tx 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 to a rp8a;.z+vhm5tuw6u b24-V power supply. The operatiwpu6 8+z; mavu.b 5hrtng current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V hzrxbjl/km 5 lzgb4ut1 40z +ml. nq,6l9jtw) power supply. The om jh15,rn9llz4q)kb/g+z4mtl ux 6 wbj. l0ztperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage 5syp- f*q( ph4 65yfahe1b6itqsc6m sof $120 \; V$ 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 causesebj2m4/f/f zgh :l-xd5h .hlr 14 A to flow in the secondary. How manlrf 5zjxmb:l.-2hh e4h /gf /dy turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V),7jhxg fko/l fiosal3u,hk7u (c(7o primary if the 24-V secon (,)/xkl 7jo73c(gfi7oh,lasho ufuk dary 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-turer qf+o7: dv:zn primary coil and a 2000-turn secondary coil. If the current in the se:7 z +eqordf:vcondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Aszxk, g2-rer /rsuming 100% efficiency, how many amps at 24 V can flow in the seck,er-x z2r/r gondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The p2dkj3utt7(t z at,fb w2fa:7krimary k7t,t2taa3j k:7 uf2d(fw zbtcoil 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 primary coijqyp/ a(l g*ert5sqd+6+sd/dl and 300 turns on its secondary coil. If 120 V at 2.0 y 5d*gd+ 6ld+(qa/tpe j/ sqsrA is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer h/eky: ,ll( 19qz earblas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curl,1 rz:le a 9eq(kl/byrent is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tukr e10-9qu/ok9kg yo16ui zqyrns. If the inpuku9ygy/kz que9016o1ori qk -t current at the 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 its secondary has 200 turnoj29lx .nrbkvi1bs-+, ykzj8 s. If the input vob.ij zn1yo9l,x8s+b vk2k j-rltage 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 transformea4j,yo+ m1zq8v3:.wju nszb kr has 100 turns and its secondary has 200 turns. If the power input t,+vj.8:q j4o wnu bz z1y3askmo the primary is 100 W, we can expect the power output 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 60w7p6.y sok ;lpmlm4 )1jgbd8h A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmittekg8m4pjs.l 6 )ohwdb7 ypl; 1md 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 6c+ ,xulfxxh600 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the phx6x,l u+fcx 0ercentage 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 volc0k 5ob,c)8o 9q,2qn1-nysbvt kfhv vtage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lk v8cqk2h o9,bcvb1n5vsfto, qn-)0y ine 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 2ah nxc3t+: i 6zp1ly j*r8b6h:gsplmof 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy::mrn6 y +6sxlhzjtch li *3b 281gapp 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 rj90an coe3 .rnar1cdb3/m+ sy esistance 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, t1 .0 dj+ n3comrerasbnc y/a39he 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 les w75cry7wm6g qs power would be lost if the power were transmitted at 3000 Vmgw7c5 y6r q7w 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. jo rq*bw z2g*qrkzdio r/719)It is to be transmitted on a line with resistance of * biw*rr9r1/q gzdj ozo7k q2)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 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. H*ht*r;k . sg:p upnt;gow much energy is stored in the coil's magnetic field?un; ktg. htsrpg; p**:

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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 and an 1 8d sjd+v21lkr8xbil98-H inductor. What is this circuit's time coxjldrslk881dbi+9 2 vnstant?

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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 is 1m:ufox s7gj u;hs.x.+.vb-c p 20 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. Whwku) l.fnjyp:c 5o)k :at 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 12i7ghxele1q8th; 0u 1 j0-V AC outlet. What is the resistance of the lam hgl0h7 8u1xei 1jt;eqp?

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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 peak curreej e4r4 e+c,f0kasau 5nt through the ,s akfeeu +04e4jrac5 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 connect z fu(n--/2thypo k6uued to a 120-V ac power supply. What is the power dissipated in the resistorh-nutof /6uup (zyk-2 ?

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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 is0 xfafc)jw6 +l1xiop- $I = 0.80 \sin (240 t)$. 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 *schba qp4v(- t5h( mmresistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isi)sc:w1z nvh ) $I = 0.80 \sin (240 t)$. 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 1.5. h.h/trl aqi0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at zmqov.6qkqt -owj 5 341000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil 4- pgvqa50g wihave 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 nec1l2d7b- lsgvu+v/r5rme hd t+0k5yeressary 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 i1k i2 ynutcp8.n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied.tn8 ykcp ui21 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 bc5 vch+ a1/cx2vvtdfj*+ 5wg.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cbld 7t4-wnb+8 enrjr .apacitor 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 capacil zcxs4b)3 t ozzj2;*ttive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor hpadu0eny0 v4t e023.k 2qovujave 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 capacito1(fv4ape 2pi wr be 100 W?fi14p(2ewv a p

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF ca2kuqaw3*ea:d o 6 eay)pacitor 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 resistan42 8w2 z tycnifvr7pf2ce, 15.0 W inductive reactance, and 10.0 W cap8ctr yfnp2fw 2z2i74vacitive 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 impetwxq39fdda9 q 5;wi6 ldance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connewq;5 di3w6lftd9 qx9acted 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 coil, and 8fm,d94qt3r shypbh ; 1.0-mF capacitor are connected in ymq3,hfh 84r;d 9spbtseries?

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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 ta80q4zdus;gith a 20-mH inductor, what is the impedat80udsa4;g qz nce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is tk*x2 l xiw;yrra1l 4e/he phase angle at 100r ;k1xariyelw4xl2 /*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 series1iz6 /n0m aokk9to + oflgcb-7 circuit with a 20-mH coil and 1.0-mF capacitor for a total i- bi6otl07k cogk+amn1z9 f/ompedance 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 ;a,z -8fxj ) x.sdcesycapacitances is needed in series with a 100-W resistor an f zj-xx.)acdse;s8,yd 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put y1kgh5m9 cl ;yp3zk;fin series with a 450-mH inductor at 5000 Hz for a total impedance of 4p;g1l y;m9k3khfy5zc 0000 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 resistor at 1.0yimmuz*e /ox86h/ 9k5tz l9 ck-MHz for a total impedanc9m/tl ok m8i/yhek zx*5zc6 9ue 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 2aorb40+n q/z ep:ly.o0-mF capacitor. What is the impedance noeb z+lr0yqa o4p: ./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 +ay)*n hct )q urd7:hwtotal idry7)*cw a)+:hhqn tumpedance 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 capacits5f5t 5 dx/jx8i6)qof( q wndjor at 1.0 kHz for a phase angl5x5sqj5xi6 /tff)wod8qj nd ( e of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is need7ndakv; a9 -aqfv7 4u /m,gfxhed in series with a 30-W resistor at 1.0 kHz for a total imgv 7 v m;xhnaf7ud -fa,k4/aq9pedance 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 capag9 qc8-a6p7slacqq -c;dpj3 b d ods.3citor at 120 Hz. What is the phase anglesbsoca q-8a 7d q c9jcd6g;-d .3l3pqp?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-e2+ , mod.hyeng,k nzpo/ 1t*l8juxu3W resistor, 20-mH coil, and 1.0-mF capacitnhu+l , u,t k3 n8ezj 1.d*opomyg/ex2or are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0v;(z:o v.h ubc3i9y0 arr5toq.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is tbai. v0oyrzc:9h5 (;uo3vr qthe 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 reacta8xa)0;lxc ujz45-djf a9bzxi nce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current j) x;iz8bl uxc40jaax 5fz-d 9flows 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 cm56d no4ki( ctircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po o5 6knc(4midtwer 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 resistorqmew4a i76p,( :rzeg z for a phase angle opi,z(6 w ga rz:meq47ef $40^{\circ}$ 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, j0 hgd30i*yfoC = 10.0 mF. At what frequency should tojyfd g03i* h0he circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuits h71t7:zw )h4pzrwo tz3k/oc with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V po tkz/ :4ho 3w )7z7opzsh1crwtwer 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 xv(o li6rlr6*k ;ux,bAC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 u s5mb ; cx;w;:br-n-urtei.sW. What is the power fact;nwbbr.;mrs; eti-ux c s5:u-or?

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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 serie0t ,9yj pyree6s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powe9j0y6e,re yp tr 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 odil)(et.n8j 6w) deo /usdd1hf a 1.0-mF capacitor and a 15-mH coil in series?ie6e1d) )(jonsw du/dt.8hd l

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonantjjgc(7x)8 e* , 2cqf/t :b0rab5c cfyibvor4x frequency of 100yebc4 5a8,c 2 :qb7jbr oi(vx cft*c g)/fxrj 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 fretbe )i3g jau;vh2 o2b5quency of 1 ubhvi);ea3 o2b2tjg5 000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH cia3b 0l6sk.,eurb6 bt*4t, xmz/jxnroil if the resonant frequency of the circuit izet*n4mx. u/6i l, abbr6r03st,jbx ks to be 1000 Hz?

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