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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exszgg p: alnf6b6 gg78(l 1.wiycept

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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 s*/ ls3ul3l ux:no5ln 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 ,ommuuc-g;.a change on tgm .-ao,u c;umhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire 6upb 1d)ptj a8produces what kind of change on the inducet8p6u) abjp1 dd $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kinda)sid)o 1r3+p+vv ix2ger )uu of change on the induce)e2+3x+rv 1 o sivdu u)i)gaprd $emf$, 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 fromomo z7x4 xxff:42kk;s a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law,0 xri;z2agow1:om5t d gle 36z the direction of an induced current in a conductor will be that which tends to produce which of the followmr3 a 5ztd;:gwog1 exiz2o6l0ing 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 horizontk1eq0jj80b nhrr 4 zb.al table. A bar magnet is held above its center with its north pole pointing down. The stationary maghb rk1jbq0e8.zr n0 4jnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magn122v ufl9l sd3 .np9eyzwdv- met is held above its center with its north pole po3dfsv9d9- 1zem pyl2v2 l.uwn inting 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 magneti.opauvfl2y/ 9kr xdy.8 e,cg;c field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, w;ya r v.e,fdo2.x pcuk/ 89ylghat 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 kkfn 2vet+ji/gi + 6 mk*yc.6utable top in a region where the magnetic field vectork i6v+c kgk6iu/*j 2mnfety.+ points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as 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 horizof .pv41sd )4 7nn/ ifok,9ph9oi sjvykntal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When vie, kd )4v7kn49vp. i f/n1oiopjh9f ysswed 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 on a srlizu + oox7;7)52 hucnp(w kmj6r(thorizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of o7uklwzsx6rrn (2tpm)u o5;+j(7ih c 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 throu6 80a*qtxlsjkgh a loop of wire with the north pole entering first. As the north pole enters the wire, the indjq06ts8 *akxluced 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 constant angular speed about an axis wao6mcvnxefw6 7r: n: /hose direct6 ec nmr:v:wx/67fnoaion can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ 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(fgjc l6j 2.yt an axis whose direction can be varied. In a region wcy2j g.fj(t6l here 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.v wu:p j9efrf 0nwz x5.z*/qp,
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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 t ho4m(5qf1mjo hat 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 magnetic field.1* vtqhy8wq v, 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 easw* 7jhzh8dxurq8f c(g7+5n rgt-west direction) is moved northward at constant velocity through a magnetic field that points straightgcg5j+qnh 78 (uz8rh7*rx dfw 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 constant axn o2w lj(qz1+ cv3en+ngular 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 transform9r22.yoe czqze psv;s7rln;/ 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 revdt + 36i kp2yx(o*6;t( jdpweyvwy 8mzolutions each second. The frequency of the 6pij2p t(wvo(*;tz ym3 8dx d +eywy6k$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used to+(h) khg vzw834cl 3jq3qivmf

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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 devt/ks/ qd nx+h,dk+r) fdv:8ye ice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops thanfqq4e/av; d mg4a:i4m3 ic87jg-eivqxhh+/ m the primary coil4;qmmh/-vac/h4f qgjeexdg 43qi8 +7: aviim then 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 lrrzx 6ehzvr)0,3 zre /oops than the secondary coil thzzrrrx/v) hze,3 er60en 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, the0y ezm :0vcgb/ 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 resonant cir )oqegesdogrn91ebb rmwt2;189 y0u .cuit,

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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 serv vw8gcdj24f0 p+ cnbi2ml5u6lp *d 1cies to an ideal battery of constant terminal vol cfp4ipu+ 621m*n0ddl82 vv5lcbc gjwtage. 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 are connected +mdfn1suta431do k/ s in series to an ideal battery of constant terminal voltage. At the mo/ +3d4unm1 d staf1skoment 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 withmojex9.f0gh .de 78u n inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 wit:g jrr *2hpyft hhaor*b+ /6d(h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in serj:hko 5g4dhc t37*c lpies to a battery. The time constant for the circuit represents the time required for the curreh7pd3lc c j 5h4:go*ktnt 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 a bgw3 0agkg*( uo/9xbxre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit rebwggg/ukx0 39o (bx*apresents 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 ttk-i7nmxy)wdxk.v(m w q 72x-he 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 supply. On this circuit, the12ctbv to lt- -*q+f nwan-c1p 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 anhj7 v1a 2pdlw93ejns8 AC power supply. In this circuit, the curren1ave9pj jdl2 387snhwt

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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;wp jkdoq9. rvx.yd ;0 an ac circuit changes by what factor when the frequency iwxk0jpqr.vd. o 9dy;; s 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 isn wx6 zbp8e,9nj 6zn.s doubled, the inductive reactance of that inductor6pw bnxnj8 ,ez.s 96nz

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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 8u k 1cg9(vbdrtelv713pfwq0 inductor approaches zero, the inductive reactance of thaev1wk7dfv8(gplcb1ru 0 t9 3qt coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, t2uqh9 oa, 1 bxl-u.:zm g6pidfhe currenthouqdp29-b:af6 i ,uz xg.lm1

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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 ch(, t0yiod-.hpqn kiz4 anges by what factor when the frequency is i .,0td-q4(izhpyonk 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 voltage across a capacitor *+ngimfm2 gs 3approaches zero, the capacitive reactance of thatnm+ *g2 fsgmi3 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 tjvf6a3s/qwa q k.n8 m)he voltages of the inductor and capacitor in a RLC seriej snq/ kva86q3f )wm.as 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 circlrebrpv0alcd 6 t9*7lwiht 32a6 9 7kxuit 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 hj5cp u f wsyxho/; --six44of4 hl3q6the circuit increases if R increases. When is this statement true?h3;4/6lhw-o f 4yiqh j5 xscpu4-fxo s

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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.eob+zh+ /dl * 6n2vxxi The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuad*ug.9zb8q o it 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 bothq:tz-o gbuw)d8a0 kxd )et2s +0tnqv( double in an LRC series circuit, the resonant frequency of that circuit wil: oz8kd )+tx0qbw0n2eqatv)tgs (u -d l

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuite +y8ac.n: tbzh *ag6g that is 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 Rh84gfpu c57zp4 yku5de3bkv: 0 4lykbLC circuit 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 of 04n l h,dn ewt1e4+0zfa.20 T. Find the magnetic flux thro1fatn+ hz d,0lee4wn4 ugh 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 mqnr0wf2 u,f -nevw8+5dy, zjjb5h. v0xvt a9 is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thv0 qy,jx-ftrw e8nadh jvb2n09,+w mzv55u f.e 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 e)4in .zuqmy8 a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the8qy m i4ne.zu) plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singl jlny 9tg.;br7e 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 coix,vd- lw0skggk sl (/7l 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 with6v;i5u cy4 )p1rxkbxi 200 turns 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, find the average value ou4y5c;6 1 b kpxirxvi)f 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 a) , iw5uvhk*gynd 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 c4tn(ch* ur ;a, ivpm7and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m i* kc /9vgw,zjflies horizontally at a location where the downward component of the Earkg *wci9jz/,vth'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 angula 4qrx/5ky e4x4ar4fy fr velocity of 2.0 rad/s about a vertical axis through one ofxaye5q/4xr y44r ff4 k 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 generatdors6 )hrsm q 9r/*1aaor 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 consi x hwg0fu0 c)rw ng.*s4,ljv:zsts of 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 $emf$.

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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. hvr jz6:dj54 wvgs+w-Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm sh4dz:jr 5-vjvwg w+6about 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 of 100 turnq*/-v cel5 ere0,tkduu9hu ( ks of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of ,w/btkr cw/f4*som7l12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 s,kcw4obfw lt7 *m//rT 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 gedmn 9f.rtzu2 3nerator 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 6h3-m nvfl dvf;a)d0(6fm8bd a.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 ogu ts8hqnx-:7l u0,gvy4.yecf 6.00 W. The motor operates on 120 V AC, andg:gtc4u, v0y -xq7snyuhe l .8 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 resii hg)m9l.1nse*j gk; pstance 6.0 W is connected to a 24-V power supply. The operating current is lpkij1 g9h) e;ns*g.m1.0 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 rb.)m:l g z7bh;2hoaois connected to a 24-V power supply. The ophg:bab7o2;zrl. hmo)erating 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 cona d4msnw80p* ynected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac0 sy*mdn 48pawk $emf$ 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 s8rrb56c da/ok 7ywca;gv9e :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 transformehh*8yp 4rird5sq)y 3w u8mu,hr causes 14 A to flow in the secondary. How many turns yuq,wh5h ris8y)h rmp8*u4d3 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 -bb8;dmzk;s/0tt3kffp n l:t a 110-V primary if the 24-V secondary has 100 turn;mtl3nzf0ptb d;- ks/:k8 fb ts?

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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-tus-z y3qrmnd-;rn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.r;mq-3 snzd -y0 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 pr., hgg; a(n5n+vs ) ejksyn*kiimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow *j a.nsn,yen+(s5ihg;g )kkv 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 neona)4rpumwxqem 8n476e sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prau4mr8x pwe n qm)4e67imary 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 coil and 300 tur g: -8tqc oiq/.qv 7w)fjbu/qka7*nwxns on its secondary coil. If 120 V at 2.0 A is applied to the primary, k8xajwitfgu oqv7./7n- b)*qq c:q /wwhat voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tl5*s p3d 2j6upb:im mav0bo,zurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the seco06:d5bbjpz 23s maupi,*lmo v ndary?

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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 turn(fcey0i+ /q4w q*dv/-r (hlk(ekfqn qs. If the input current at the primary is4qi(/ec(ff/0 q - lw yvd(ekn+hr qqk* 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 trantldp: w 4j7rg(sformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the(47 wlt jpdg:r 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 sec lel obzqw7+q)+9;9go hl sg9ivih*j*ondary has 200 turns. If the power input to the primary is 100 W,+iji v*wgq9+llo9) e 9b*;hsqlz 7gh o 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 60 A of current at 120 V. The voltage is usually st,narzvg ,yb,2vs9q zxu.e gcn e0j9 +ph(n y6-epped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary-yue ( , vn+c2rz,9h.z,bgs9qannj6x vpgy0e 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. The voltagk1 0t3 fprocz)e is usually stepped up to 4500 V by a transformer and tctp1k z3o)0fr ransmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currv :prde+ pq) g uj6-2pxvcz h5e3e)l9xent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 16rjupz)ghx :-c+xe v59 vqde2plep3) .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 v kl/(d4x2wm3 d)kco t50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, thcvt)/lkx(w k dmd342o e 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 resistanc8663;pnsu,hy/n 3 lm epbdlite of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss 3p6 3esnhinbpll,8 m/6tdy;u due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. mp:l-wnq k 1-wHow much less power would be loq-wlkmnw 1:p- st if the power were transmitted 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 genera7gnh,:dv tii5:wrj x.tor is 440 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 tra,i5 7.dhn irgwj: tvx:nsformer 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 w )auly1s, 3hv omn*7cA. How much energy is stored in the coil's magnetic3 ,w ychl1*u7m)snao v 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. What igig( 6;fie kp)acf, 8ie.y 9wgs this 6(fe9i, ifyp8 iggg. cwek; )acircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit do* u 3 42 k*t7c5yebvgxre.k-bh(rqn 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 ko(zna18+ ,y6uigdg+4n(mdra uts 0qa 120-V AC outlet. 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 iljay6 g:xx9i2 4 +qyois the resistance of the lam qj+y9xii:xlgy62 4ao p?

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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 pe hj jl g8/kro-bep/)-eak current through the resistorge -hj jleork-//)8pb?

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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 power supply. What is the pd m)t,b;ob/ 7.jn lutdower dissipated in the resiso, /jbl)u7t;bdmdt n. tor?

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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 nlrl.y7au, s;/p-j 0qbenm )l $I = 0.80 \sin (240 t)$. 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 5pll ufk-.4q1dxa2 b)a0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resip0j1 si q*i*fistor 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 inductoujs2hf 18 1krkwn wgry o-59-5yu- aiyr 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 1000 Hvd l.2,yt(b. ul;n . r(ecbganz?

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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 have 14.0 W of inductruw(mem e s0dx8)5sv4ive 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 forv k*(xzmr0p4q-0m rnj 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz aktux 6ih/:61fffsdi-uh/m2is appliedh/sumfxdfat-uhi /6 f:1k6i 2 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 cob1 ;xgrk0gyp ;il 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-m;/c5l) rmlxcaF 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 neededirgdwjjx02 * b9dyg 9-kle37b to have 50 W of capacitive 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 doeez/ p.8.wcx7nf5 ewxk* 5,qwsghks v+s a 10-mF capacitor 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 capacitiv6yov 0sjmj ebkbbm//m0ff45z y* z a42e reactance of a 0.010-mF capacitor be 100 W yaysm mj2 0bb4o6vff0*/zjm/5ez4 bk ?

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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 capacitor at 100 nvf s-i:n):am0 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 a9h vuk4dft twv3221ngc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacigw1 vhkv9tn d23tu f42tive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz0.ukzcnh5l/ i if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conne50i.knz /luch cted 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, 44dvz z.pp qmwel,)j /20-mH coil, and 1.0-mF capacitor are connected in series)4zl 4,ed.wpz j/ qvmp?

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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 serip657 jbzcq3d*oxh xi /es with a 20-mH inductor, what is the impedance x b6 ihcdpo7q5*jz x3/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)kcffu*yhq. y3no i -* connected in series with a 20-mH inductor, what is the phase angle at 1000 Hc*k)fqh-iouy f n.y*3 z?

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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 circuit with a 20-mH coil and 1.0-mF- sw5 e (1rbhope7oejobi(.*n capacitor for a total impedi s( p5eo7n1we (hb*b.erjoo-ance 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 capacita98cnq09tf xt9az lat +nces is needed in series with a 100-W resistor an0taaqc98t l+nx9z 9ft d 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 in series wi8ayx 5ifo )i6 08acoxdth a 450-mH inductor at 5000 Hz for a totalai y0fx8 d6c5i)x8oa o impedance 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 resistor at2 fxnu70 qk6vq 1.0-MHz for a total impedance of 150 k fqq6k0 xun72vW?

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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 serieso4r-e julfe+;au s*5h with a 20-mF capacitor. What is the impedance at 100 uh-*u rl+asf5eejo 4;0 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 serpi(e0jzd+ k; oies with a 10-mF capacitor at 1.0 kHz for a total impedanceodz ;eik(+j0p 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 i0 p(f tcgj8hw9,di 3ybn series with a 10-mF capacitor at 1.0 kHz for a phase anglw(d9ihgc0btp3 j fy ,8e 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 resisrh e :h7k n)xp+ci8x8)yza( eftor at 1.0 kHz for a total imp8 xc)(: hr)kfi+h xazee y7n8pedance 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 capaca1e b,3ociup;itor at 120 Hz. What is the phase angle;pe3baoc ui ,1?

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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 10 bh6a5y3*kwbp 0-W resistor, 20-mH coil, and 1.0-mF c3by56h*a bp kwapacitor 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 zjxg-+3wup:bik0xxw 8 cdaf+z c5+l2 -mF capacitor, and a 0.350-H inductor. The circuit w++l c az3jg2bxd:p58kicx+ 0uzw-fxis connected to a 120-V, 60-Hz power 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 ckzg rd;q 5q+ovn+j81 xbvua )1apacitor of capacitive reactance 30 W, and an inductor of inducrqjd5 x v; qu1k +)n8zoavbg1+tive reactance 30 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 circuit containing a tfteht,/3wj1 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,th1,twj3 f e/t 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 5:lp-stwq-;(wf t6z jq 00-W resistor for a phase angle of(jzq6 ;t-:t wf-qpls w $40^{\circ}$ 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 = 26jgz h23ky1 xj3ehot,0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dr,txg3ey z2j hk 36oj1hiving 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 afwt78g3t9d 6qirotk ; c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac ;r6t9okgt8q7d 3itwfitive 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 Avd(gaan9ou- 2 u3rv)qC 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 resistancb(b bsu6aajcixij(,0 c k f:37.q s6tke of 30 W. What is the power facbc,7 3jf:k0baa qjst((6x iubi6 .skctor?

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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 containin y9*qwyj7nt6x-wzj sk. x 4+3fgt8qc tg a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60- zytw68qqtsc y3gn4 wx+ jtk7-j9.f* xHz 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 a7p: xia quyz+ lnq16;k 1.0-mF capacitor and a 15-mH coil in series?;auq+pxz7 yn6l: 1i kq

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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 wit*wqoue ; )bb;ven+ meu7j/,kqh a 4.7-mF capacitor for a resonant frequency* eqeowub;ukm ,) jeqb 7;/vn+ 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 inductti v*0esc7efu -c (ym0or for a resonant frequency of 1000 Hz0 7y -(0evuc* mctsife?

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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 resie.6 1h. cn+j4u3xsfkd: ktlm ystor and a 40-mH coil if the resonant frequency of thekxj +4. mdk1l n6.s3yf:tehcu circuit is to be 1000 Hz?

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