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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 exce 6es)f+04 h/agluq ijgi dce58pt

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thyucb*:vzqcvh;9l 89 ne $emf$ 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 producesgd mu- :*x lh w4pu11.3w1udt2 s k+yhtxke6ch what kind of change on tht-duu:hk ms gw3kpyx.hd cw+t14xu6*1hl 2e1 e 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 fiel;iy yy:gycy : +pwrtv;eov 9 d/f,5(ped through a loop of wire produces what ycprtd ;: (:ep/v5e9yg+yifyo, ywv;kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produc7zpr,. ox.zdnes what kind of change on the induced.p,ndo x7.zz r $emf$, 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*un/ n-f ikz 7ty- gnf33yncz; 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 iab/u q+bfxn j3e)xo5j9/w )l, oxu 2xyn a conductor will be that which tends to produce which of the follo yx, x93u)u qfx/l 5+wbo2/njeoabx) jwing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is helm)x 2v)v t5t*rh ctj:sd above its center with its north pole pointing down. The stationary magnet )5ttvxr j2)v :csth*minduces (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 hori6j /e-n yueyi*zontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnety ene-*uij y/6 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 a9 h8 qju1h1h:zgxn o*c region where the magnetic field vector points straight up. x*u g1 nh9h8 1qcjzh:o The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field v wvw(1i q hgww:8jmn.aq,9-szector points straight up. The magnetic field suddenly grows strongemga z-qwn h iv.w9j,w1s( qw:8r. 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 table topz 8vzx*:a .z+.nd /x*ivjkd fp in a region where the magnetic field points straight d ixdf./d8k v+ jv.*nzpx*a :zzown. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies bh ysbug/ r ;whaiw 3a60s+7,kon a horizontal table and carries an ever-increasing current norha0kgbwyb s7us3,;+ w /hri a6thward. 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 wisl(*q a38nf yjtzo *k2th the north pole entering first. Asf*2yn*3lto sj k 8(qaz the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axisalkepb/)9136p bvivtj7ec e : whose direction can be varied. In a region where a uniform magnetic field points straight docb 9eptei7a/6j vb p1:v3)ek lwn, 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 attqx h/m3x6wowjgr)t3f i44g 0 constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points/0 fwo)hw3jgt tg4 i6r 3xxq4m 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.8hm gf gje *.-wo)whf.ls8 iq/
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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 a /8-ia*zd g6i9dx xlson $emf$ 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. mf4yud,cuarbts*1ni3 qp8 qt z)mez2d8f2 78 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 moved northward at conja o-/ f.yi dd:7qo9drstant velocity through a magnetic field that points straight down. Make a statement c:y9ddo ra/qj-.d i o7foncerning 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 b0 qv48 x cwtent2p0ucv/wp1s (ar rotates 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 transfont / 1t*ehs:wfrms

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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 rev.wvs i m1/i-aaolutions each second. The frequency of thesm/-aa1vi i.w $emf$ 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 tt- 8l ks1 5d(k5v9:zgermmda po

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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 thv;jn xteut/+ xc9e h4nu 9(v7ycdha6-at

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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 th)s 91zbsm* c43ecx5a:etxmhn e secondary coil contains more loops than the primary coil then it is4nc5tzmaebcm9 e* :sshx)x13 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 t: /7y5o z)gknx+xlqytq9r l(more loops than the secondary coil then it is yqt9xrk( l/ xlt7n5y):+zoqga

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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 inpyn uiz7 6fg;hq(/)wcput

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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 circuit,5ql qv1t2pp v1.)sjp p

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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 ser ;;czta-xw vmpt00 voax5.3qe ies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the -;vcxe mtpx0q 5zvo t0.a;3aw voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal ba8l)q8m i- :l81npckj ndffb9 uttery of constant termi nq 8k:pfj bmc1f-)i98 nldul8nal voltage. 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 resistao nri;ei1 0n/4el gs4gnce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancyoz 5zjj88; f1r-gc ide R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The timf432 rx abk-ble constant for the circuit x rbf- l4ka32brepresents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bat zajo(5/z) ew9niuge3tery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requine wz35oegu j(9a) /zired 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 )qamc2nnmzw /zt 6-ep7qi.1 f the 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,oo+h;mu c4 o3-l i;sph 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 p(ov x()ylgu. 3 mccy/rower supply. In this circuit, the currentmyr((co/vxg)u3. yl c

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuj; 97qluhsjc .8 lgf9wit changes by what factor when the frequency is tri cqjll8jgs ;. w99h7ufpled?

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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 At+so .dd5b xu)s zfzig- ;:f1tC voltage across an inductor is doubled, the inductive reactance o d +s zotx-.z;t5g:d1 sfifb)uf 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 inductor approaches zero, the indbz3t84 ;i duoziuq -9ib4 -lbductivzqzutlb3bibd - -u 4do98 4ii;e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an ACvxgt:xliv- 21 b2b tyo/ +/pjb power supply. In this circuit, the current/lvg/xt 2 oyi- pb21+j:txbbv

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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 frewb048nsv5nry)s1 i*t h-tyn k que0-hvn)rwb ysi*ynt8k45 sn1t ncy is 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 lv2qle*zo6 zm8xq-8v AC voltage across a capacitor approaches zero, the capacitivlqxl8v6ez*q2 oz m-8ve reactance of that 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 betweeniq)zjw3 )d4v 4 c)ihpy the voltages of the inductor and capacitor in a RLC series ciw)i4qcd ) h3ziy)pjv 4rcuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined xa9)g2kckvq eywit9..e1*v y 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. jn6 ,+wqq h00ita;vj a The impedance of the circuit increases if R increases. Whe;w6qj+ 0naai0jqvh,tn is this statement 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 cilf2 ,v83otjb 5w,sjbl- i4r tqrcuit 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 ofpkaw9dl+js8 iefqn d.q;(;h/ the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circui*.2ok, 78bdxcrquvzd t, the resonant freque,8xord zcd qku* 2v.b7ncy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an ACzyct9 3tyw 3/esc7 dhr v/rv49 applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs when oymfj-vnl,nm4+kvp5 j 8,5yp

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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 nnc01/4nwztoew*at 0 in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop /ea* ow0tw zc0n4n1nt 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 0.14z( , xfnt os.:ps-lub7 r.hd ri ulh-mlh*v/:0 m 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 the magnetic fie4iz- dro*.rh7x nb:m.u hts:lf puh,-l(/slv ld 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 rt51kp 2ic4sx jko6)fdadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux tk1joc6p2dts f)k4 ix5hrough the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single):jfoo(n 68 g2sqtkrl 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 chantvcn14 -5lown9a q-lyk1on wb6:e do+ges 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 )a-q6d+drptt mqy88y x4ffe6g,iq9 n 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 ingqdf)t8 tqneyy8q9p+m-x ,i 6ra6df 4 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 are/i264xn al5v kcjje +da 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 awes,+ wkkn(ltas 8vn;y )-xg/uhr7 z7rea $0.20 \; m^{2}$ 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 6 7kc16 * yq32gi4 (vszrl4zxsjc*bm km0 m flies horizontally at a location where the d6mlcv3 k127k* 4gxiqmysbc4r s jz(*zownward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a c e 0zhlbl.rn 0lc9::iconstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mai9r. nlb z ech0::0cllgnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and) 2 vu1hti +2h 8uo/iodf1tlqq 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 q u +bkxwme..3100 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. Eachkbic3v2. vf b727v eqj loop is 12 cm long and 8 cm wide. The armature rotates at 120 7vq k eb72.v2ifvcbj30 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 of 100 turns of wire of ay1 .wk;ev i7jzrea $0.090 \; m^{2}$ 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 simpleaku )q(khw1i3czim//u;(mf o AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T iiz u(m/ao3m 1)ufkikhw/ q( ;cs 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 g x1 2 g+grkobqnp:c/-penerator 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 havk;55vm+ f stat yq.pw)e a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. )-*p*v htah d:eqm j(yThe motor operates on 120 V AC, and whe(p*e h)-vyqh* :ja tdmn running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6v03cx+ot qaeur ro+7/.0 W is connected to a 24-V power supply. The operatingeo/073 +qvc+ ruorxat 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 power supp,0dkr/1m)f2v 0b-syp0a b bberk e- iyly. The operiv-ka bkrep ey/rfs,-00)bbm 02 ydb1 ating 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 toi k py(pyn1w 8x..n6 qcvzm*t( a 24-V power supply. The operating current is 1.0 A at full speed. What i 8 zx*vnt(.. kn6pmcwy1qpyi (s 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 prima wu7ope *j:;hhry voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secog--oz nfq.l 4npb/n p*sdhxs53ng-s0ndary. 5nxsspf--d.n goq n3 sb4/zgh l0np-* 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 z)6 8v 2frobigturns are necessary in a 110-V primary if the 24-V secondary has 100 t g6o8zf)2birv urns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn second6h;o( 4nt 3uf vu7yhfmary coil. If the current in the secondary is 3.0 A, what is the current in the primam(h yut3of; fvu74h6nry?

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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 lgf /v. o(lwg+of a transformer. Assuming 100% efficiency, how o+.fw v(ggl/l many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at2qux oj 9ba-x0p x5:tti uomlqs*q 5:7 10.0 mA. The primary coil operates o*505 :lxti: xt2u j-mqp7oq9uqobas xn 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 onm7t k:a t9x+gauy8c4 n its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appl:t9t7 48x +umgaykacn ied 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 has 60 turns on its primar.2ndojm b 4ic8y coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pr2dcj bi on.8m4esent 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 lf27j)1jjnmy5jz o5 b5p2 n qhturns and its secondary has 200 turns. If the input current at the primary is 100 A, we can e)fn1z5 p7j5mj q onyl2 j5h2bjxpect 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 20) 422* ;vbcgwhfwkls wtv).v2hsp.ct0 turns. If the input voltage to the primary is 100 V, wesgwvv;tw2tcv ..h )lkf* 2 2p4hsw c)b can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer hasx8 k.x1 qyf2+b2el;zmcue+;vs, mngm(e , mt w 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary tog. ,,y1(fsm xcv e2b+ mlxmeu;nk;2mw+t8ezq 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 12q,l4jentl 2x *b/p/l y. 2hklj0 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 number of turns in the secondary if the primary jyle l .4*q2l kt/xpnbhl/2, jhas 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 3cvj)urpsr q: towz-r+ 7pz5: current at 120 V. The voltage is usually stepped up to 4500 V by a transforw: o+q)c r7vp-uz 3:pzsrt5rj mer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuae.e a1)to+ce ally stepped up to 4500 V by a transformer and transmitted through a power line.e1c +aota) ee of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0z,oiecw** l l 29dlwdzbm*; t-.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tri *o -el ,w;zw*d9*bclzl2mt dansmission 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.nbtw np5wul04: 2x 9oe A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppbt0lxwe :n wo p5nu924ed 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 )aj w55( sqnf9u:ars/oay8nm 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of a5ju ary nnsof a(m5:w9s)8aq/t 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. u70m mxacxvx14c vh( .;cm+c yIt 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 the power loss in transmission is not to exceed 0.010% of the original +um.amccx1vy7h(;v0x ccm x4 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 )dmf4 jov12 xt5.0 A. How much energy is stored in the coil'sv2)xdm4 j otf1 magnetic 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 indujk4-e6idf dq./ d: uuictor. What is this circuit's time c qkfd4 :d-6eudiu/ij. onstant?

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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 (h;dp l2dywf9 is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is th eoy7ohol*mcx tb9e419m znc8m*z34ye 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 resistance ojny +v+i1 gky erdf76 *sild1:5p o3aif the lampp g+yj1i5y6i+aoi 3lrsdedf7nk1: *v?

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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;5w:t w sxv(kq peak current thw;(q wx:k5 tvsrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powyo1*r9y )ub) qd3- ytyys n0cler dissipated in the resis *-l0qr1nc9byy yuy )oy dst3)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 resis nj/lajr2n*p;v ke, tuse-99n tor 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 resistor ijdp2*p m+)n7lvvhu *ks $I = 0.80 \sin (240 t)$. 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 is:0a64;iuxjfdo * q m:nuz ql.f $I = 0.80 \sin (240 t)$. 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 inducsb iv2npp8 9mm;n;f4 rtor 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-z 3kw y-r51jjqxtj)-r2s. bnomH 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 have 14.0 W of inductivilr1*j, ;:an :ruq rhpm;2-rexgvyg , e 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 necet4y3qdwkrb ,gb; d,e; ssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductorqu4xl-bwr1(t: ubl t.imb wy4 z(j0qq p 4w,c3 when 120 V AC at a frequency of 20 kHz is applied to it?w4 l: tyiru3b0x cqww 1ujb,tq-l.pq(4m z4b (

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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 thxz34eu- f*g jk0s ux, :h7utr . 4blo6.avfvbmrough 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 4.7 58cokip837 r+px/ 8axdlcj m lm2aa-f-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 o0t q+ 63avqw57ntuzih f 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 dow:ndnf+ v(,66 xmnoealuc 3s5es 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 capacitivg5mf q5 2i- cr/ cou9yeju,*xv/rjlw)e reactance of a 0.010-mF capacitor be 100 W?jo/g x icm 52uc e,-j*vrlr5)qf9u/y w

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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 1000 Hz aditwv7kpb+be2xf 8nj;)( m o4nd 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 resistance-po0/ 1-yc4pwz,p rm 6xxe nzw, 15.0 W indun4om6x1 zc- pp0wzw,/ epx- ryctive 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 impedance at 1500 Hz if a 100-W resistor, 20-mH coil, af 5-m kvylbj3fz7ay-(nd 1.0-mF capacitor (3bjyk -mza y5lf v-7fare connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFqob:y(abitv)gh njd. a6z6f kx e.56+ capacitor are c 6qa+bj. (kx)y:6f5 tdo6hv.enzigabonnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connb *zoshb5 6k +-+b,sq2amfh y5a+wpokected in series with a 20-mH inductor, what is the impedance at 1000 Hz?5- wp6z+ okba+2 *hs+mksfb5qo,aybh

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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 te8kc a8jr *2q5isd:ns.h jj6s-o yr0 qhe phase angle at 1ydjji 0k5s s qns-ao8 :6jhr82 eqcr*.000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capz4bqrs0 w b0yt0tfn8*acitor for a total impedance of 100 W at 1500 r080qb04 tzftbs w*ny Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistcr5 xhg. kf+8xv)i2g bor and 1)5cfb rxig 82 k+gvh.x5-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 mustr 2q uwxa4wg*xd.1f9v be put in series with a 450-mH inductor at 5000 Hz for a total impedg. 9 4fuxw2qwa* xdr1vance 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 at 1.0n 3n84,cqn pad-MHz for a total impedance of dn3p ,qnn4ac 8150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacita0z fa38mkdri yx 33t/or. What is the impedance z/m03 xatdf3iya8k3rat 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 cy3 d)ij78z6 p-d)ojq jlge4bwapacitor at 1.0 kHz for a total impedance of 45 8e3ojidw-b7 j q jzly64))pgdW?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a pb7krovl1 xj/fy-yv 29 ea)6ughase angle ofyva 27xkv1o-fu ejb /) 6glr9y $40^{\circ}$?

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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 atsn k4nogfeu**;k) xp,o 0(rvjvjx9 j0 1.0 kHz for a total 4(*vn,xjp9r;gk0j * eus 0)jxonkvo fimpedance 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 seri5 (1vrjfo s:i;, zwmcwes with a 100-mF capacitor at 120 Hz. What is the phase angle1(:s vww,f5 ;cj zoimr?

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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 ajzo,g2* ;t)qgwafw ( k 100-W resistor, 20-mH coil, and 1.0-mF f;(a z)gwojkw qtg*2,capacitor 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 1o r*kefgc1;o8 0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz poeor; 8 c1*kofgwer supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an gpcyct/ p47h6e:, x usgs cj1cq7y,5einductor of inductivetgpe c1g:s7,7 yehcc u5q,j64p /ycxs 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 50-W resistobtz .1 k aa*6jtsywp+5r, a 10-mF capacitor, and a 0.45-H inductor, when connected t1 +aakpty.z 5* ws6jbto a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W red pfilfw1mjc*m wp 34br7(;3 l8mgvn( sistor for a phase angle of n*( (ppm clil34g1f7j m;wbdw83 mrfv$40^{\circ}$ 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-mn: sefs: 92satf;am1iH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transfenf : st2a1:sa9 i;mefsrred 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 7,w+.hd0urusji 5namt;3 u5egq q7oqin an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wh.ogdm577 u qntqa hs+iwj5r 3u, 0equ;en 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(vj aa)4xc.as 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 resib+z9dmc ):n73vzp fynstance of 30 W. What is th7pz:vdy zf)nc+ m39nbe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a am 33om+hgrq6h,w blip+)4 dp series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po+,doh+ h63gir lapmb 3 )pqw4mwer 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 coi bz +s)y8c7j; zfyb 8ese1d(znl in series?bs zj8()n+ ze8;7s fb edcy1yz

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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 series5ftnty o +xv) p)ga*7q with a 4.7-mF capacitor for a resonant frequency of 10 kH+gx *7fno5)v ptqt)ayz?

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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 se +0aut /qdq*nw )wt9ltdgczaff*t2375bka6q ries with a 3.7-mH inductor for a resonant frequency t/6 ufak 7d*qq 09lw5db atftz qctw*agn)3+2of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH csx(oo1rmzz3yo:h8o to ,a 4j(oil if the resonant frequesot:ya xo84 zoro3 (jz om(h,1ncy of the circuit is to be 1000 Hz?

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