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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 4ui;ogs b6-)tt 3cphjof 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 inductionnuz 4g *ujadc+y o2k5+ states 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 pr- : gs+k 3m0e1xwvk1zvzrt7otoduces what kind of change on the induced-tsogxtmrv3 k7wez z 1:1+vk 0 $emf$, 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 mag+m :idjvfqbvh9 f-/;enetic field through a loop of wire produces what kind of h+9 -vdmjv qb;:f /ifechange 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 produch8t- x(/ wcikjrzmyl-9ykn 5*es what kind of change on the inducedxmji- /y9tckn-zhkry8*w5(l $emf$, 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 fieleh*0ah (sq:owq5r g5q+m 1ixe d 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 vo*) 0-fqe(caiv;uxh an induced current in a conductor will be that which ten v*e-)caf(iv ;xo0qhuds to produce which of the following 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 ckt 8 ivunj5:3l0 -dpibar magnet is held above its centtjkv3nci l5i:0pd -u 8er with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is heldi9mvvoh0+i5b g k8 (wv above its center with its north pole pointing down, and released. As it approaches the coil, the falling8iikb gvwh+(09v5vom magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poin a/n7 uru3su7kd5 ( dp8ei7qltts straight d(i7el3k7/nuds 5rt q u8u7paup. 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 leveg5j12v4 oj4 5aha jihnl table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the dire5n12j4v4a aj h oji5ghction 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+itum;7uh p8jx 2ahs1 top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, wuih+ sxh 2 aj7um;p81that is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increavat407eezp (ksing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the ivz7 0ae etkp4(nduced 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 withd52 9fd79b yu5*pn -eri0-wrjywsbop2f a la 5 the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abo2r ewod0*y- 7yb5-w rbf5psidan2fl9p aju 59ve)

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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 abou1uc 4ai)ji 1z*7lidem2p*ulzk(6x cdt an axis whose direction can be varied. In a region where a uniform magnetic field points straight du6ca*1u e*x21d cj kpm(4 z7li)ilzidown, 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 a41. )xrx -z7cnrsw /ezpg 6gpspeed about an axis whose direction can be varied. In a region where a unip) xs rxn6gwezr g1-/z74ap c.form 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.qq3nyy cauq6v);3 r;l
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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 an(fqy6n2ky ;4yuy *ne d $emf$ 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 magn8vb2pdh hbf x7-/ b7ozetic 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 directg )fwb1,b 9qjqion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemen wfg9,)jbq1qb t 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 ar pv,w-33lbj cc(o z/o 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 transfo1d ;fmof*h1 cvrms

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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 ukkvhn v8g-0*y qa, )j*fkv2gsecond. The frequency of thh 8)vk*fgv 2kkavguqnj y-0, *e $emf$ 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(fr(4t 3 vto*fh. gdhud tr:m3 used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thacpxxy8r(;t 0mco7r t-cvd r9 /t

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary cjqoc uoph;e6+ 784 wep 7o8wruoil cu wrqhe+4u poep7678w8;ojothen 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 mv)iqgbj)a,g 3rs m. f5ore loops than the secondary coil then r ggv)53,)jmsf bqai. 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, thgd6s3qy 9+y f-;pu re/:urro ae 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 cq sb ki(89vlv,/ca 3arircuit,

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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 0z0a fh:l.nrj.e* mjw of constant terminal voltage. At thenja..mzfw00:e *l jhr 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 connect89qz+rk/2 emp,vv j dm7db+lyed in series to an ideal battery of constant terminal voltage. At the moment contact is made with the vr2 dm/8dzjm+ k9ypvb qle,7 +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 5 xw r7ffnq*i;1rvb br*hw6c; l:du i8L 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 with inductance L a3 ub +zdy9zuj7nd 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 series to a battery. The timefulp-0c. hb)0ina m5b constant for the circum up0- b 0a.hc5nf)bliit represents 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 batterytf-bpmu4843j :yiqdb . The battery is suddenly removed from the q 4u3fb-t: j 4bipmd8ycircuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following haxoay; b(ywj 2m4s 2eh tveh2 /o,;d.rvve 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. Oeoz 9 aj6t a)w34 *pcsa. ;pau4dou0neg5sn;q n this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. : w/fc k;rymdc*e:tc. In this circuit, the currentr *: c.ftccm/ewd y:k;

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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 circuit8 icgtrj:oh51 changes by what factor when the frequency o c58i:gj thr1is 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 voltageb d4yy73aoh5 ynvsr) * across an inductor is doubled, the inductive reactance of y3y 4r) *onbah dvy7s5that 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 acrossw ;e*fdm*y ;gm an inductor approaches zero, the inductivewy g**fm;m ;de 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 AC power slc:7 eg6k;oa/bmt;cs ltu9)3a :mp awupply. In this circuit, the currenc)lu:7o3p6s;a:teb ga t9 lk/;a mcwmt

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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 an8cipll*f2o deu2 db- w ,+coq5 ac circuit changes by what factor when the frequendf2 wl-o o8q,2d+l *ic5bupec cy 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 AC voltage across a capacito3if mb)5i- -ie/kb bajr approaches zero, the capacitive reactance ofbmi5f bje)-ai/ -3kbi 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 between the voltages of the inductor and capacitor in vs9 m)4o *4.xb54ncbcdwf 7 e e(bmnbka RL 9m5w7bb n.bb4msd)con4ck*vx( fe4 eC series 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 circuatz*mdzmpp1rji5:o jrq+6 05 nbl):n it 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 increas4y-qk + 5zcgzmes if R increases. When is this staqk m-5+4zgzcytement 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 ogdt+ (i.khp9c h7osx76s j-f(8lh ips f 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 circuit in s7.q jo(0l*n,e 0k zthsejt/ay3o x:jcreases 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 serie yz. yfyqma::u(i1n)5u9tk l ms circuit, the resonant frequ yumi:1lnz yf qau:9yk ()m5t.ency 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 AC applied voltage. At res xx9 .w k05ed:uped3jfonance,

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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 almr2lu6 *,b1 slj6bs 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 fielc 4ut-zq)*nou -ni ym0d of 0.20 T. Find tmc izytu0u*o4 -qn-)nhe 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 in a uniform magnetic field of 0.2+ k v:/qhd*wil0 T. Find the magnetic flux through the loop when the plane of the loop dkv lqh*+i :w/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 ti+ ;hm1nt(je 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the j int(;mt1h e+magnetic flux through 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 singlekmk j(m hhz8l5e2hv,: 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 p-sjgxg7v/+ovxw b*xxq6r46changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on0ib u j h68kl65wkicg: 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 averb j6ilkh 06i:w8gc5kuage 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,)fh2lklvgahb z2f8i5 a g;7x and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areanvi (,/yha6c p $0.20 \; m^{2}$ 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 66;hlu2j8w8 yj9cjwrcvi:b9; ak g1 hs0 m flies horizontally at a location where the downward compo2 ;;6c j wwkailyg8rju ch89vb:js 91hnent 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 th ,q: xogw(ys, rdkwj:wx8tx8 6at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constanx, ok8:t:jxw w6s(gwxy, rdq8t 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 50 loops and a cross-sect9cwmy ;9 l9.z2r1qneq h/xvpgional 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 tu4 b :0*qdombadrns 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 f bey2)bgwl5 rh5pwx/ko )30won its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the ) 20whfpw/o5 bbg5k)lr3e xywaxis 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 consistd0( ul0o qn6r;gmdk 2f,qbaw)t(n: vfs 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 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 Awnxi p 8ie9 cz/789p5ii.jrov C generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avaxn88civizipp 7ew/5oirj 9 . 9ilable. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wif3b9, t-k-pl emij(2 .arfr 1jus)rkuth 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 of7+pp-o5 r-.ra5ohx ywf)v:wk-l8x d0 zfejx x 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 5tt7 wf/orn7n.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bacn/7wo7frt n5tk $emf$ 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 z+u-n(1wds 7rip + jyrresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A.dj(-n+rz uy7p1 is+wr 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 supplybs.ben99zlb , . The operatin9., lbbs9bez ng 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 resi78j y;4.qrlgvrflyg( stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at gyr8fj7y 4v;.grlq(l 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 transformcwvxc+ g n;e78-1y dnter 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 t s)s 4ilep:ncdsdv06 :.ksz;fr2gf;h2h4bharansformer causes 14 A to flow in the secondary. How many turns are in the sel6s)nfc fd;kp 0.g:4hhs ; 2hd2avszbs4ri :econdary?

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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 x(zsj /u:i4 sj b27mkymany turns are necessary in a 110-V primary if the 24-V secondaryi(4jms7su bkyx 2:/zj has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn 1beg6p3 tfq6l primary coil and a 2000-turn secondary coil. fbp 316tgl6q eIf the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effita w1ugrkfk2:wu2 p /:ciency, how many amps at 24 V can flow in thekag2 krw: 1/tpw:ufu2 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 1scbrx1ld92(f q:ew y j i5ke;provides 7500 V at 10.0 mA. The primflesbeq1(j9r;1: i wd25c yk xary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itsrsmoq8 ;9bk:jb s y1/c secondary coil. If 120 V at 2.0 A is applied to thbqjbs/ c:8o mks ;ry91e 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 u0l0pq*api41)dsi yo has 60 turns on its primary coil and 300 turns on its secondary ci0l0ud*)op si qy14a poil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformezoro3xteq9:meh-4 5xr has 100 turns and its secondary has 200 turns. If the input current at the priq4r-ohx eex o 5m9t3z:mary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary sg 9x grk(o8ey /*bym,has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vol g( 89*yor ,bgmseyk/xtage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sbl- -*mx4krxsecondary has 200 turns. If the power input to the primary is 100 W, we can expect the x4* lm--b rxskpower 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 ake 7 wmv(mh;s5t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns h v(k5 me7sm;win 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 currglkch1 s;z skk; p ix4t3r,b leyw v844,o54chent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the tkxg 3r4lptkwzc hychlb 4 ;i,8kes ;,vs415o4ransmission 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 usuallya8r :n7xat6sb.8s rri stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power losa : s.s6b8rrt7ran8i xt 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 lvl6xr5zlw6,x ine 50 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, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost ifz x5w 6x6,lrlv 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 t4odsctawh v:r 2./-fh otal 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, the voltage is stepped up with a transformer with a turns ratio of 100:1. a2.chtwfs dr /:v4-hoWhat 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 d crel(4k870beg)koh s fu5 ;gx,kl.lpower would be lost ik;4x.ob5gkd8e, lcek0fgs hl (7lu r)f 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 generator is 440 V at 62 1;zzykzovqiwx9;z 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must thqvkz; oz1x9z zwy6 i2;e generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current k- u4q/sp))cth, ffn.b yuwv9of 5.0 A. How much energy is stored in the coil's magnetsukc pu/qnfw)f. yv -4b,)9htic 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-Hsdu tzp6r,s1w1 qz) ,i inductor. What is this 6),zquw rz,i 1dps1 stcircuit'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 where the rms voltage is 12mrwc6w t j0.ij9so40 l0 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 i 3ajuh)z r-a*1as1 i - ,hvuylqw0nov5nto a 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 120q 2tvxi .,g,rkvy f9*j(nfdl( -V AC outlet. What is the resistance of the lamp(gvi x,*kfjrtqf9v d2(ny,l.?

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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 supplu8bbva t+57k,j *u hiwy. What is the peak current through the resistw +bj7vauh,*5 iub8tkor?

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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 s2 0.vbsxk +xchupply. What is the power dissipa+xks v x.h0b2cted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W quq 0 eu5nz+xg)1/hic7z ; tudrr*;c yresistor 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-Wty wq68ri)w e4(0hlnh 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 5ut1ox i8g5lw /fum8g +b;-q lv0-W resistor 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 60 s:t pq -u93jnwHz?

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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 i codik-6(v)qt.*h- iqg 0mmjHz?

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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 co c*q+uf/mvc)yil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W oy2:o u 8-02gxta kjhzhf 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-u(2fv 7 j9r s0hzeb+ndmH inductor when 120 V AC at a frequency of 20 kHz is applied bnz7 f(ujv2se0rhd9+ 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 m c.(nv(c dvqy/e9l0na 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 rea68mvfzae( i c.ctance of a 4.7-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 1 bhb4;bnvu 6v )uwrqjqt+,y: 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 does a 10-mF capacitormn-x .ms orpi7tt g857 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 )jls jw4utga) l;m))m-mF capacitor be 100 Wjgmt ))s4)laj;l )mw u?

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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 capacitorl:iy51oqa c ,omlq74h at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W in48ghjow1 et)b ductive reactance, and 10.0 W capacit1)g 8ohte4 bwjive 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 impedm)taf toho90 (ance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?hoo9 0a (tfm)t

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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.n 8gqgi(7:jyw*g0v py0-mF capacitor are connectepy: qv*y7jw gg0(ign8d in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20ef :+py pgeamq7 ) 1w3hjv2y5g-mH inductor, what is the impedance at 1000 Hz? :y 5jghppqae21fe g3v+7)ymw

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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 4r .c n+kmtjgch*l 01ygssk4-inductor, what is the phase angl0gkns+ yc. j4m-*h r4ct1lsg ke at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH c*swyjx t .hh-s v5w8(eoil and 1.0-mF capacitor for a total impedance of 100 W at - y (w.*hhs8vwt e5sjx1500 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 resry:u mk:fo / b7ce):ifistor and 15-mH coil to get a t/eu: f yc:)mo7kifr:botal 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 with a 450-mH inductor at 5000 Hz fokh16 vzc(i6zkr a total ic 66k1i(zzkvhmpedance 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 1008bovry t0* p4.6sk bjvh)o -cr-kW resistor at 1.0-MHz for a total impedance of 150 k r yt6ohj8 v.p4ovk* rbc0)bs-W?

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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 capacitor4w1 -w zma:zacxi*tv u2qg1 )t. What is the impedaz t1mq:-gwa) cw zv24xt1i *uance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series4 vpujck1) ,gp with a 10-mF capacitor at 1.0 kHz for a total iu)vkpj cg,p14mpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.aui3+1ed ay+:pdjbu)cbn+t( 0 kHz for a phase angu3y npbc)tdde+1+ :bui(a+ja le 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 needwnvbvyl u5a1jb-( +h3g ( ;txc9;dk 4trvtdh6ed in series with a 30-W resistor at 1.0 kHz for a total i 5yu(3 hal;tvhv -rwk;ndc+dbtg4( v6t bx91j mpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hai dbgr-xr g)qbsk8 3y6rqed .g: 2(/jz. What is the phase angle?g.(8/ e 3rbad6j:bgi)r 2ygx rs-q kdq

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resishmbpn v c8fp1cj 33x96tor, 20-mH coil, and 1.0-mF capacitor are connected inmxb 9np hc133f c86vpj 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 yah xhj7z2.* lof a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connecteyj. l7a2x zh*hd 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 capacitor of capacitive reactance 30 W,n0ng5s1ya5dp( x4ui3p7ka q9i ,rm qc and an inductor of inductive re ydgsacnpr7 4 1au9q,iq(5n5p kx03imactance 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-m 7dawig 42kh:9naryy a 7ov5 xbu23+pW resistor, a 10-mF capacitor, and a 0.45-H inductor, whh9rpgayv4m2xud koy77a5ib3a n : w2+en connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase -b/;h.dh(sk tg;xozq angle o. (- xtsqb;ohdkzhg;/f $40^{\circ}$ 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. ce2xi6e e o5b,At what frequency should the circuit be driven in order to hac2e xieob65, eve maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.mi n)r ./k ;*ni v5bliu;5seok0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the ci;)*5b lrvn nk iu;ki5e/.msiorcuit 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 t1zk , mq. 0f8m6okiixcircuit 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 andjycp/*.dizmq; v 7-ozx 5 7xpk a resistance of 30 W. What is the power factoqym-7;.i/ok x *z7d5x vc pzjpr?

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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 co: mbcygg+34z hj pxt/:ntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?y:gzx3 bmp4 +:h/gctj

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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 fdd;qlwe2 i+ )daeqd j-)ea.,a 15-mH coil in series?dddaw2qfqe dj +e);i-l .)a,e

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7g-j gk*,xvvjf8g dl5hwl0 mnr7 v m6*7-mF capacitor for a resonant frequency of 10 kHz6,v7gh rn0jl5vlg- 8m *7mjvw dkg* xf?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a rdv f 1oo os-+ayrkm s16tdv565esonant frequency of 1000 1 yar+1o o6 v5-mdskots65f dvHz?

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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 w5, +yijzcprte: 0 f7.sppcm.cith a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?c+5y7i cefj m..tcpzppr0: s,

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