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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 magnetn:6 .fk/wft feic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stat,q c1*nf..krdtc+p (po ba1zdes 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 o-to1e 0tut vw gxfklv4 hn-597f loops of wire in a coil produces what kind of change on the indt-9gfh vko0n uvx 51 wt4t-le7uced $emf$, 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 prkw z ,e/)p:rwyw- l/oeoduces what kind of change on t,/wre) wyp :zw-eo l/khe 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 loo7jx8; hqc1n g7 mg c5wyk0v3xdp of wire produces what kind of change on the induced g wj58dkc7myn3 x 7c;0vhxq1g$emf$, 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 magneti(;qyr uffsj0srgq j1x ;6:m7w c 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 dirr- q /wm 7hw6nfnft53c1jkl :fection of an induced current in a conductor will be tha5/3-f h r lmnjf7kct1: wnf6wqt which tends 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 bar magnet is hel7e6 se .heo:qed above its center with its nor.7q6ee e o:sehth 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 mjs b)sne1e dr)xb9. 7vagnet is held above its center with its nb9r e)bvxes.s d7j1)north pole pointing 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 kddm bv zlo85 s:-q,l6top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sen:odlvzd,-bs q5k6 l8m se 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 magnec mbw)s;vz6vni ;s7x+bl3dl 9tic field vector points straight up. The magns3n9 l6x md7w;s+ vb;bcz)lvietic 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 horizontal table top in a region where the magnetic fipv3ng8bkcm2r0r 8o:if bpo , 6eld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in bp 3,o:86nm vrf 8p2k0ogbi crthis 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 horizo*+ujp:m +qw stk7lor4ntal table and carries an ever-increasing current northsj qr4w*+m+p:lo7utkward. 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 with the north pole entering w i1);qijq(w wfirst. As the north pole enters the wire, the induced current wil wqiw (;1jiw)ql 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 w1wk b r-g7cm r:yagft. 3ho0 2b*,kcgan axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what muscm b cw tfrgk7yar: *2 kbo-0g13w,.hgt 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 sw3v-zug cy ,4lb,doqi43h wx. peed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what m3 ,lwgu 3zb wcv.q4i-yhod4x ,ust 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. b:qgc(z vp.g3g,c ;x80kesrv
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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 tha9f 4cgb- bwk/vop lz:5 wq-qm9t 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 fqb66bwd5nj 5 v)di gi4ield. 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 nor,rd. 63ou vvkathward at constant velocira3k, d6 u.vovty through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a cond+.fa,*+ nzrrd0 g, 0vmq bjrwstant 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 transb9z 1je b:r2+ij zlo/hforms

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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 throughje sbi3dq8o+6- lif6n 60 revolutions each second. The frequency of the8b+jn3e ds- olfiq66 i $emf$ 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 devdixm;tc- 6g6yg l7ro u/fru) ,ice 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 devi 09ujj+qfc/ r(vv81qa (wmqkhce 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 than the pri 4 0ynz0qtmkz);m( hximary coil then it iih;qm0m 40)yzn( kzxts a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secol4fnk+mnqu.: c9eru8 ndary coil then it i4 cmn. ruek+:9lun8qf s a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power m9,kq9t+)qajvv -r /lz+8dj 8bvxxan 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 circuitwpdyls (vae;w ;u j*an7z i4*0,

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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 sv 1f l o3nb;c7u4; gouxie/4everies to an ideal battery of constant terminal voltage. At the moment contact is made withucevxn f7 34v/e ; b1o4gl;uoi 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 /jhdac77wii /;nc ho5in series to an ideal battery of constant tedi jhha7 n/c/;75 wcoirminal 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 resistance R is connected to anrvf ojhbm ;t;7o ;*wu; $emf$. 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 resibij3 h0aq psg2weyi565i-;t lioz +r3stance 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. T.,njglb hd 8z5he time constant fgl8d. hn ,j5bzor the circuit 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 tol.ho( dpm-9i lroocx/3:.eur a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreasixlodp-eo/hlr.:m3cuo ( 9 r.e to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excep6u 0v)d b)vo: 2offdoht:

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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 poqq7( oau:e+fp wer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. vas meq:7jm.8 In this circuit, the curren m8:v7s qm.eajt

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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 :vb gb7ku)v1 )sxp ,j7wils5zcircuit changes by what factor when the frequency is trv))p,x :lw75b7gk susi1 bzvjipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the infryuq3,, d /w8f wht8kductive reactance of that fu,8wh yq3kw rdf,/t8inductor

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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 approachesur2 /blb,.h-gmuv+2 for dv0 f zero, the inductive reactance of that coill02 +vudbgmr h.b-/2, fouvfr

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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 connec,1vvt6mq o99 xlezr3xted to an AC power supply. In this circuit, the curre 9ox1q9xev m6lvrt3,znt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactazo6 ,c iuea4 js1mvb6z(rsx(. nce in an ac circuit changes by what factor when the frequency is triple(61.es6 (v4bsmz uoir a,xzjcd?

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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 approacheucm* ,gjj(s 0is zero, the capacitive r,* 0 ijsj(gcmueactance 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 between the voltages of the inductor and r2qur:wl 1;ptpr,xz p7t*v r6capacitor in a RLC series circut v1p wr2l *q6z,rp:r xupt7r;it?

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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 circw; c zy*bwx ;86jb8yxeuit 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 in+t9z2w o)vpo/8plemc.ak :f-3 z slsacreases if R increases. When is this wfz8)2z9+-kep o tm3o /:ls.svaclpastatement 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 impeorc qi1o.v )krs6h5z-vc))np xyv.x9 dance 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 circuit incvum)aij27m )q82by e6 iuxp6w reases 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 s*so/cty3h1wl0, 9 mjlbx +gr veries circuit, the resonan3w t*bmsvl0o1 cy gjl9x/, +rht frequency 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 apb -rw0gr3g qsr+ h6+rvplied 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 0*j jhhpeo9bn3nt 8m3when

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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 rad* 2 dfifw9*xwc*urtu1p-l/az zv 9s4cius 0.10 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 field vector aruf 9vdws/*r *9z1 c4zf l-2wxtiu*p ace 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 fieldi rh0q r(1avhckjn+s98pvf(ak 79dr / of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the rrvnka vdsh91ph r9a /(jcq08i+7k(fmagnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fi0i,p5yl ma0gleld of 0.20 T. Find the magnetic flux through the loop when the plane of the loo,0 05ip gmylalp 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 / iiu(j5sza.ynoltt 77j6t/dxtbc,2 jw 7l )s of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil c uk15ar gbktx/eq 3vvx*s+ 9c+hanges 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 onpcl- bf 2l: i1m1my7jg 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 avera:b 2ji p7yl1-1 fgmclmge 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 witfj /*y3fpcay cedb(*3h 15 turns 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 a z,k1 k0qvra9kb:tzd :rea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatickgcm)y/q+e *h,v)hvs9ml w/on where the downward component of the Earth's magvm/kc e q)/*smy,h )v+w9lg hcnetic 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/zrzb th(0l1 0 zq;fmn1bh8 pd that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis thlfbpz8d0z ;m(h0rnb1 1hz /qtrough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area(bjtlfwcjb p 6jg7 -8; of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of 4vreep 2b3 embb1x;i) 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. Each loop is 12 cm lo s;h +ioj0vag 1*cx4ivng 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 axis of rotation, what will be the maximum output voltage of this generato4vajg c+0o iis*1hv;xr?

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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 turnn i**dwguh 5pni :5c8gs 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 simplud.*00mso lcnw *1c xbe AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the ares*m1b lduow *cn0c0 x.a 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 c8r a)lp4zl/bg/+ r +cx-jff nwith 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 mog-cgo04fmt oze, 2b,bwfnk9 o *a,+dotor have 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 s+* yx(r:s io, m(tirva resistance of 6.00 W. The motor operates on 120 V AC, and when runningsi (oi s+ *(vtxry:m,r 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 )g*z ifhep /p57t7twaresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the st7pwf it7pzeh /g)at* 5art-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 t1k/tkkqq 7z7 qvb;p s1o a 24-V power supply. The operating cur;1qkkb7 kq/7pztq s1vrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suaq lu8ij 58w836dta irpply. The operating current is 1.0 A at full speed. What i 3lr 8d q5ij6a8awt8ius the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage gxrf7 ygjb2,1y( lv 7ui0gmw +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 tr/cf(/l2gyc/ptr5 lw zgi o3 ;wansformer causes 14 A to flow in the secondary. How manygco /2lp3w//5g tfrl(y;zc iw turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns a hc 4-ee x5sgfc.:bcz.re necessary in a 110-V primary if the 24-V secondary has 100 turns?gz.cexc-f: 5shc .e b4

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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-turyg w9mh(ud1e7j* 8 sbjn primary coil and a 2000-turn secondary coil. If the current in thebs*wh98(d7g um1y j je 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 primge h0 xvd69zg0;-xjkfcyi mys4-0,l xary of a transformer. Assuming 100% efficiency, how many amps at 24 -g 6xyv00-shi0fyj mgdx4lx z,eck9 ;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 u0scf7a3u 9ly transformer provides 7500 V at 10.0 mA. The primaf0y9acusl7 u 3ry 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 haut by+s) j6 0g-xmh*r*kdvf) ss 60 turns on its primary coil and 300 turns on its secondary coil. If6 *h-yj)t)sr u*k vmb+sgdx0f 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary cot zr9ftx *aq6 9)*.jqwip)ke oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cuierzok.t*t pq99f6 wjqx *)a)rrent is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary ha* 8xyok0cflj 6s 200 turns. If the input current at the primary is 100 A, we can expect the outpucxy0j olf*6 k8t 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 jz. ;( u/iscngturns and its secondary has 200 turns. If the input voltage to the primary i ;j /gin.(cuzss 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and ithdt eh t)0e8c8s secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictht d)h88ee tc0ional 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 voltat )r.vzi e7:(ykxp* wc/c 6gmage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fi/:gr6 t7mzwk)ae yv. *p(ccxind the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currenb d/ss+ ,or7fnt 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 transmission lined / f+b7ro,ssn.

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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. Theyv1icy-o) . xc 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 transmission line if the voltax.cc -o1y)vyige 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 0.60 W. A 11k3rjalzx oh8(e2nd generator produces 100 V at 70 A. In order to reduce energy j r eh1 3x1nald8k(oz2loss 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 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 resistanqyj.m 975j0whfigaz5jbe( q9 ce 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 ja qjhm79bj y 0.f5(5qwi9gze 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 1 p zbwnyc1dl0b8 ;+q,x000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1; ,+nbdc8xp bz wl1yq0000 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. It isj cqs;z/8 ff*4e otmycy0,r) j to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped;qmy,ecyc) rz8f4fj*t0 osj/ up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energwwi*k*mb;axtm8 i :4uy is stored in the coil's magnetic fielwtwkxii um ;*ma4:8 *bd?

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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 is7ik (m /wbz5he this circuit's time consth5( z eibm7/wkant?

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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 1205eli19f4nkt woh+ s 4fe0g 0hy 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 120ikp j mgv48z1;-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 intt:d 82btsrx+zzi(fm*k 8 c)nso a 120-V AC outlet. What is the resistance of the lamp? s:bcn )i*2xdrkzzfs8mt +8t (

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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 to0z6o ;)f,z y9wktqqjr a 120-V ac power supply. What is the peak current through the resistort9qwzkrf,j ) o6z; yq0?

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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 touxsp:l/4 c73q :ikjnn a 120-V ac power supply. What is the power dissipateun4/ck qs7 3 ijnlxp::d 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 50k im,4wwmu(xq/) a/sv)iqtg 9-W resistor 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 f3nuia4o phpsk );4h3a 50-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 resistogv 1 3gwdykv61cn +u)bi9 bs0k p.to2hr 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 gks3 9r.q;xym a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil ;n*nm. gmksta2vnp2 ,-cw0 pxat 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 +7 z 8hmbcbl,oof 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 necess, tpd.2 ti2nq.cduei5 ary 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 inductor when 120 V AC s/v4qh:d/e x.m6 937obpkybtnaa x 8cat a frequency of 20 kHz is apq./havxse: 4378o/9ndcpb k xb 6aty mplied 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 throujs-lof. xoi 17gh 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-phdvtenx; vrys 15c o:4(3b g)f4zjw8mF 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 0d vpe .z8iox.wg;q q1to 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 does a 10-mF capacitor have a rp :+0j5lp/w6bijyv qy eactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor btdj(gczsl t : ).fdxb9a 77wrw 63bfm-e 100 W?tft rj bbwd-7.a(6sf zwm9gl) 3 7dxc:

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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 capg-7 t5 -m3xeturba:luacitor 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 o7 (z93 svgaw-e yh;,ilek cuy/f an ac series circuit with 12.0 W resistance, 15.0 W inductive reactancec y 97v(u,3li;/ eweghsk-yaz, 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-m ihih241w8f/ik1uhw957 szrra(cmsrH coil, and 1.0-mF capacitor are conne1hu4a 9c2f7sh rwhizm8ks/5 i 1i r(rwcted 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 4raxiry2y dlq2db55+ 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c52adx4 rq2ybly 5ir+d onnected 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 20-mH induc1ny 3o*vzip1aihr0ncjd 7,a ; tor, what is the impedance at 1000 Hzv7 ndo, n1*yrj0a3hic; za ip1?

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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 in4z qxa:1jca yh+k6hs8ductor, what is the phase ang s1 ahkjc+haqz:x4y68le 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 201r.x+6u i44nxcwcg y kez, s8u-mH coil and 1.0-mF capacitor for a total8y,wgc1ux4uze.nc6 +ri k4 sx impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in serot v1n(/4zkgs l;jf- :ppiim;ies with a 100-W resistor and 15-mH coil to get a zvf:ni/(p ;l josp1tg 4i; m-ktotal 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-axpmzs8 8(k4 gmH inductor at 5000 Hz for a total impedance of(az mx4 g8sk8p 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 serfm czb889iwj(vapf h2r*p:- yies with a 100-kW resistor at 1.0-MHz for a total* - 8 iwffh9p:vmc b8p2jzya(r impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wi*,otrpe4 h 3uhti6 o(/m8cy pnth a 20-mF capacitor. What is the impedance at 1000 Hyt6(e3rp8o o*th,i 4 p mnch/uz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a totag 9*(we2hpfc qaz+yu: l impedance of 45 zep2 f(wqu*c h9+ya:g 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 senz76tt6w(y1 h 8x puybries with a 10-mF capacitor at 1.0 kHz for a phase any7b tt1z x8u6ynh6w(pgle 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 resist dsivl7 .pf-s )/ b(pm59eoenmor at 1.0 kHz for a total(sbmp 5 e oplvfime9./n)-7ds impedance 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. /0kc38qr.asfddb 5g zny4v y-mF capacitor at 120 Hz. What is the phase an3g/q5 ybasdvzr8 .4.cnkfy0 dgle?

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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 15a wv6c9(qg -vz4 zd ujq-ktz*900 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriuvtqcqj4k*zzdg- 9z - 9aw(v6es?

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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,b 1t q4/auv1aiqfupk0u2t, 2s a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current42 iafqutqbu 2a 1sp1,tu /kv0 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 rq5b-mw) np5u keactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit b5qwk)upm-5 n?

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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- (i 4(*rde1mgp d0wzneW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pd4e nd ie* (w(zrg01mpower 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 sera g 1.y- tckc5-8rodem;stv+b 6mrdr,ies with a 500-W resistor for a phase angle of , cyrrg85;vot-s1b e trkm6d+dcm.-a $40^{\circ}$ 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 hasa;1 wmd o71s dz0yt,it R = 20.0 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 driving sotd0so;11a7 tiyw mdz,urce?

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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 circ*0jhh 8ahz u.z snq0+;y 8cte c5zm)rhuit with 12.0 W resistance, 15.0 W indu;e 0r5)cmzz8 .* tshauhc y0q+hnzjh8 ctive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit57lc6 x,z26km;pciw5pl atg6 kp3 ux t is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 303lttc ti,wnp z;;e/(a W. What is the p t;z3apelit/ cn( w,t;ower 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 series RLC circuit containij * obo2y*l(np.*wfesng a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu*nws2 yo fo(ej*.*pblctor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency a8mnu(vdjn/ ,of a 1.0-mF capacitor and a 15-mH coil in series? ajnvm8/ud (,n

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonanv4,e545i iwrxl-w)x (z mprhp+j44hq+ pzsezt frequencypjv,5zx54sxiz( 4rl +r4em4ip) zh-whw+e p q 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 inductor 7ql j jcp8x80t*6a /bf/ry1uqorup1 qfor a resonant frequr yc8 t1rxp fb*u/la0/quoq7 q16j8jpency of 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 plach5v6tyjl7bj ; 7dby ;ked in series with a 30-W resistor and a 40-mH coil if the resonb;yj75yd;hkj lv7 b6tant frequency of the circuit is to be 1000 Hz?

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