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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 u qa0y9+fy-y nkmc (f6x0dp.olnits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction st + uyjiwq1l8 *agk.fw byeg (.(n2mzk8ates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on t4:g2c gs ;loaahe indu4 2ga:glaocs; 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 through6 88pc1s9usmigwms8 bsgep0f2ds z* 9 a loop of wire produces what kind of change on the ind c2 w0pbu8m*meg89 ss8s1p96zssd igfuced $emf$, 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 ow/:jt8/tblz tf a loop of wire produces what kind of change on the induced /wlt: z/jtt8 b$emf$, 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 magnetic4d1nft2e vqi(7pj s 1i 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 condblgcfsl*.t3 t7it3dm .r;g- luctor will be that which tends to produce which of the follow cml .s;t7 l-.3b*3tfd tirggling 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 isx0q+spcuh)w: o3hb2hc6 u 7fq.e8r eu held above its center with its north pole pointing down. The stationary magnet induces (when viewed from 3uu:w eb c0x7hqrf6.8 sh)q 2c+huopeabove)

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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 horizonta p4f8w+ jktwvc,;c. vjnc)nm, l table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fallingt)cnwkc 8,4f,mjv nw p;.cv+j 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 h47jh:(ooz ewijangc9 ydocg;;4: .u in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fidoohoezigy4 n 4;g; 9(j:chw: .uc 7jaeld 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 table6g6 k go,o, dxiq/orpvads556 top in a region where the magnetic field vector points straight up. The magnetic field suddenly ggvk, 5s5gdp6io6o x6a od,/r qrows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tab-lv 2cu1+tv4chmj vs o+srq)wyk .)u3le top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this tu++u1 sm3so)lvq )vj- hw2vkc 4rc.ycoil 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 horizontalj-tlr9fq 9da. 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 viewed from above, the induced d9 a.q rj-lf9tcurrent 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 l3a1nb/dj 3rmfut *d f)7g:i be1en:qyoop of wire with the north pole entering first. As the north pole enters t ab :m/31 nyuejbf)n 7*qr3ddg:fet1i he wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constaj fn o36s3xf0mnt 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 injs03xn6mo f 3fduced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis gy11;ziz20badmn . sb whose direction can be varied. In a region where a uniform magnetic in ; bzds ya0g11z2mb.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.*uj rrao1b 6l rj+5b3nj 1urih2; xm+u
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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 thp d1 . /eadk,mdmal,k3at 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 magbsx0*fx d0/ btm2n5ef fmhzg i2/c:,cnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is,hb ,fgbn x3-y/0 fst2 4cnpwt moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning ht cwfpt ,n bb-4/,yfs23n0xg 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 rotatesya;p0 d x/+ amlq3.cxb at 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 generator transformj:wfok rb8p4 .s

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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 of ax c6yy:,xj qz5io,-xqgtj*i5w5b 0 i the 5*baj6z,5qowit,x5y0i-x i:jgx yqc $emf$ 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 usn0otys7lc2 m/ed 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 dt+5k2;sys sgs95 lomhat

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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 secontxz b0m) c3:-pqfnz(z dary coil contains more loops than the primary coil thefz 0-:q bnx zc)m3p(ztn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the s 3a.15azdrh2knmg4 l rewekb 59, 1gebecondary coil then it 4k e5,5gk2rg1r1 ewzmnh.alb39e ab dis a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power io9(;hc2 jq bo )x )bjmkszecx1g* -k:lnput

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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 cirnt 3*imuc7 efzt0u-6 ecuit,

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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 d0 mt 5w9p0ibqconstant terminal voltage. At theit0dp 9wb5 m0q moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ide8at--mu)br0 8c1 jfwphgk, ta *3utmbal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across tht t8arp0- 3w* jamc,buu1 8kb-fthmg) e 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 v 8x;j nppn5n+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 Rjvey;wp ujx89;:e fh+ 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 battery. The y4l p0 k.7hw,pwt2macu 9, anftime constant for the circuit represents the time required fotc,la. 9ukphwn0 ym a2p,w4f7r 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 i.df nhor.edi b ,p:8;gn series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decref8:eo;,db .rp idghn.ase 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(b qiy vibv q3iv-k*46m9bmb 0 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 this circuit, the cux;f wu4p*7;slwro d+ 1lz vbu11; iqybrrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, t6uy3 pbzv,6ooe w4iyrp c( -c5he currentopc6 or35vwec,y z ( 6piu-yb4

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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 acup3 5jliyv:cis)3ub9 circuit changes by what factor when the frequency isyu)jlb9u :cs5ii3v 3p 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 vo cxu2d-o+cp5nb icvo1 ezk)70ltage across an inductor is doubled, the inductive reacta)onk7xev0 c2pz duc-b5 +oci1nce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductocw v a2hac12i1r approaches zero, the inductive reactance of tw2a2vh1i1 cc ahat 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 7j iqc-dxafjlq.o/mo+e(8 : p power supply. In this circuit, the curren+ i(mdjoe.q fp l/jao7x:q8-c t

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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 factor when the frexjfyx3z4 6oy*quency is trx f4y3* jzy6xoipled?

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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 approaches zero, t cilnb mcm-2q11gc2) cg 7n,axhe capacitive reactance of thatm,) b7 m-1nqigxl12gnc 2c cac capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages ofxewf*7)me-+uuf/t xopd cyr5kf * 4m0 the inductor and capacitor in a RLC seriesup4e mm07k )due +fcf* fy5x/x *wrt-o 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 fv;,ezyki5w3circuit 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 inck 8:dlbum0n/ mreases if R increases. When is this stun:bmm /0l d8katement 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 i +ghj41x 4x( omcbkx;te +oy :3wboj0rncreases 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 impedatrzt2)*y t oi3 zt-jhem8w4 ,vnce 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 capacitancefm 5je pl);yad3/r; rk both double in an LRC series circuit, the resonant frequency of that circ )frapj;y5d le/;3m kruit 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 t xc7 4t/w ic 97xjk.r+y7sdrui4jb,dby 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 circ b78lamc 1n/viuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field h,nvwm 6r2 q(5yg6bjonh)c(n. 7xth b of 0.20 q7,gw chyvh( (j26m.obtbnnxr5)nh6T. Find the 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 rotating 0 4hn+ns0fs+rl a ;eylin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planehsn +;0 a 4ern0sylfl+ 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 a uu o)d a hd;u3ywv8 2ual5v+u7sniform magnetic field of 0.20 T. Find the magnetic flux through the loop wheuauvsud o 53)8 7+ual;y2h dvwn 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 adjustabwlx0(hj,p s9po/ewd(le 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 from gd/34*iyw9i: q tbmjc$4.0 \times 10^{-5} \; Wb$ 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 wir ;-(llksy-jrkj2, 9db)owk.j w z ice5e 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 Tkl( sb jwr w)kj5eo- d;,z.cl9jy-2ki to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area og6 j1sg;:qm9udvkp. rf $0.40 \; m^{2}$ 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 - rs- s ti6k0(v xxqy:fq18syxarea $0.20 \; m^{2}$ 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 atwq o:.6(;de:guz pimr a location where the downward component of the Earth'po.u qgdziw:e;( rm 6: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 ( n; zvwgflp62,-etnrvelocity of 2.0 rad/s about a vertical axis through one of its end 6,(2-rzwnnvgfpte;ls 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(nv5v5xw (f71zxx z aw 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 tu ky*acb.we y9ohv176 brns 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. +- jblbanw xzh l (vf7 u065wn1*eg,tx Each loop is 12 cm long and 8 cm wide. Thex lzh1en,tb0(j+ wl7bxn*6wavg-u f5 armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of 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 ofki5q qxn5, m3; t(lcgu 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish hy l6x4c0p.t/7 9hi tp:g wdkyto construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.6hhy tl k t7gw. 9p0diy/p:xc4050 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 generasycs4.9fue 8xk.7ryh f;ht q4tor 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 operat 1 31iwkc./fkywar*vwes 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 motxdecla;ibf n9qd)8, z:d,1o o or operates on 120 V AC, and when rqx;lb :cz ioe d8fdno ),d19a,unning 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 to a 24-V power supplyw-xs;k pq7; jl. The operating ljk p;w7; qsx-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 24-V pop71p4g,z1w 920ltnezad d krywer supply. The operating current is 1.0 A a0z g1d wypkt142 ldp7ez,9r ant full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply/kv5geqpzfzr:-(s g4j u rzrm1 -6r .n. The operati4g -qzk1g z-.f: nrm6pzur r/(v5erj sng 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 transformt*c,77cjb ucb reqg. qc(s)m 6nh,3y oer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 1+ivf i,ccitxm4o9 *2 b4 A to flow in the secondar fo2tcm9 v +4ibci,*ixy. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are ny8-8dan2bb bt c/ft -mecessary in a 110-V primary if the 24-V secondary has-2ba-8y tmbn ftdcb/8 100 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 amk.2 )tp+ir9y4xr h en 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current2 er npy)+94ti rxk.mh 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. Assumnce/w /eh5ir*ing 100% efficiency, how many amps at 24 V can flow in the secondary?rcn/iw5he *e /

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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 eo:kyt;7o a xu8u7 4dw 1gpr.va neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dra81yxoroa7ed .u 4gwukpv 7;:tw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on i uu izg-u45si++vsv9iht(f/dx,f -ctts secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the second-5fh / 9su(v+-si gx +ftduicvt,u4izary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 399ah bn0 z-cwip(l0*l8sqw lw00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present inw0 nw l*hbpc9(0 8laqzil-9sw 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 veb hu;v1 k *z7rsbxff.m4 s zw/-p5g8has 200 turns. If t 475;zwu f .v-s 1zep8g*hms/kx bvbfrhe input 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 an.n 3r.z k(qkfad its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secorzf (.qn3akk. ndary 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 secondary zsre:a hy3- 3vhas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frira ze3vy-3:hs ctional 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 cu cn.p-7zeknr 4f28 oqnrrent at 120 V. The voltage is usually stepped up to 4500 V4cznkneo8r. nq-72 fp 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. j5f/sq0hms78 ff dl2fThe 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 percentage power lost ins /lh fm5dsfq7jf28f 0 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 k6h/ ym ;daqva,dv vai5j7d/7 r.pw 5ucurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalq/u6dd5,jhiw yva;d m v7 / .7kap5rva 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(7+degh+errq f - fvc3 total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatg+3f fec+7-qdv r(he ring 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. A genera /4,nxape ww8kovf:7htor 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 na/4kh ,:epxo8w vwf7turns 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 w-q 0c3m l(dbnyould be lost if the power were transmitt0ycqm(nl3 -dbed 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 4f;5 s rcsu 72fpywowd 9++-brv40 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if th+-+usf 2vpdrs5rbcy9 wo7; fwe 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. How much energy is b: :zb7:ptp)cl8gllb stored in the coil's mag)bl: zl 8b:tpbpl7gc :netic 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 and an 18-H inductor. nfue i 7z4r y5y1(pv94at rj9dmp:l5d What is this circ9 v1(pyrjrd t7i fez4:mpn5auyl 5 4d9uit'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 Avo lu1iwwr51- hmov8*fc :fb (C circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC ouo(-gheaxnqj6m ce egn 484s4)tlet. 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 resistanc tc6nj a3c :jpb448p7de/v heye of the lamp h j jcyn3c7d8t:bevp44e6p /a?

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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 2gqz ft*t+xfbp,/:d6 z cal6n120-V ac power supply. What is the peak current through the 6*/pzg d,afzbnfl6+c:ttxq2 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 conne;b ga2-v)7osoc *u.zns4i evected to a 120-V ac power supply. What is the power dissipated ig-7.zn)* s 2 uesive4cbo av;on 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 e;/zo p 6a drq(ap1 m1-wjcdl9resistor 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 rk ,(m5kqd wm/fesistor 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 ww3mw4nom ;4oresistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 6vnkj)- c.j(rr 0 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 reacjmp2 ;2w5j yletance of 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 a 14.0-mH coil w-pg 8:wed.cohave 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 aq ,: 9:pgnaa y:*sdcfreactance 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 6y qz j:7nd 4 88lpbfo4-xchh-lrpm:z*0-mH inductor when 120 V AC at a frequency of 20 kHz is ap:n f-8lh:b q8jzd-rx7yo h4lzcpm 4 *pplied 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 tda0;) lhbyf 4phrough a 2.50-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*znme8l345ik .y rho c.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of ca d cn am4,8o(knb45tap/zdnl6:vgo2cpacitive 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 capacigt hlyqx5s,alcrok- x) 467:htor 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 ca+hdqtx4w gi ta19yd/m./ru 2upacitor be 100 W?t1t./i4h +x2waruyddq9u m/g

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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 a5 fc- w /kvq2bsoqw i2q28hbj0 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 circ *ksls5mo:, nfce:nkxkic973 uit with 12.0 W resistance, 15.0 W indusnmk 7 9o 3ex: flnck:*si,5ckctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedpbb + hlbr7 lh7;oal0(ance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?bo pb+ll0 lh7;arb (h7

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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 1 9m1y q9bv g yxyn0tss)j)n s;dcb:j62500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i;1sj6 )xdg:tv m0 c)bb9s yynj9ys qn2n 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 connected6 kua ydv98ncyq9zi r4r+z15m in series with a 20-mH inductor, what is the impedance at 100z9ndy5 +i9v8q6urkrz aycm 41 0 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 i4 q1 g/;maq qui9kyp7cnductor, what is the phase angle at 100097q/iaqcu mg1yq; 4k p 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 sertuo ;lg tuv-gv1do3e5 i --s2dies circuit with a 20-mH coil and 1.0-mF capac t-1div3u2ov;-sloe 5tdu -ggitor for 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 capaciuoe rd7z+84dpe r/7lg)wt1: dtlkr+.q,mo fl tances is needed in series with a 100-W resistor and 15-mH coil to get a total impeda4+:u/mp r7foq)r+et tzlgk 7 .oedwlr8 dl,1dnce 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 4( nxfj*kdegm es-t6/ a 450-mH inductor at 5000 Hz for a total impedance/(g6sk mf4e*x tn-dej 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 puum274a dm+ 8crrhq9 recb -u)ht in series with a 100-kW resistor at 1.0-MHz for a total ihadur28u-bhr+mrmc47 e) c9 qmpedance 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 82e c sawe8i1useries with a 20-mF capacitor. What is the impedance iac8ee2 18 uswat 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 capacito9q(a,h3pv+yttx(lg cr at 1.0 kHz for a total iyq+tga(p3 t l(h, c9xvmpedance 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 withjb7*t b/un 1sqiy+ h/fqv+ f8f a 10-mF capacitor at 1.0 kHz for a phase angle8tfy+b/v+u f7 qfq* ns hi/1jb of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a tv*zxefv o0/0 hotal ie *vzovx/0h 0fmpedance 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 serie jl ul stngn v45k-sc40.22dcns with a 100-mF capacitor at 120 Hz. What is the phase angles 5nnvt2.sc0 42l4lc dnk gj-u?

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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 o 3n;q6 *vsr1 f(ehngfand 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF (gf*qn;13o6re hs fvncapacitor 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 capacy y, z1:lmbbyo21zdp.itor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms curreoyyb2pbl md zy ,11z.:nt 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 iweoyykfk/xp/8n4l 4e0o3 5yan inductor of inductive reactance 30 W are o3ynyip/kew4f 4o5 ek0 xl8y/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 circuit containing a 50zoey o; .wg/q--W resistor, a 10-mF capacitor, and a 0.45-H inductor.wzo/qgy; -eo , 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 inmx1:7r5o4 uqjq f adx0 series with a 500-W resistor for a phase angle of10dq 5x:o m4rafuqj7x $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. )3fcsb /n:llb At what frequency should the circuit be driven in order to have maximum power tcf3:/ )bslnlb ransferred 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 serxkz1o:xv +aq0s mv+p9ies circuit with 12.0 W resistance, 15.0 W inductive reacv++s1a0 p9vkz xoqx:m tance, and 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 circuit is gbx0f2+xjvna4 b (dxaze78 w 5$63^{\circ}$. 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 r9x ;e)tmcco 3of 60 W and a resistance of 30 W. What is the power fac;3)xet9o r ccmtor?

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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 factlmh((08 jyvd :lkpzy7o3lsm 7 fkn q1)or for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connq k j7dzs3 8l)yl(hkm :0( mloynpfv17ected 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 coil in seri cobu fz)zf+7;es?uf) bzcf ;z7+o

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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 w3 e +1pinybxt)ith a 4.7-mF capacitor for a resonant frequency of 10 kH +)xen 1b3pyitz?

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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 fo9my8f tg96 v-9ookoqf r a resonant frequency of 1000 9vomft 8gfkq 9yo- o96Hz?

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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 series3 c.b svc2jw c:vzl;; thn4jxfhp+:)l with a 30-W resistor and a 40-mH coil if the resonant frequencj:j:+x4)vv;cc. 3hphscbl n 2lwtz f; y of the circuit is to be 1000 Hz?

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