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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: 游客未登录  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 excezpton z 7*d8ws5 a1:bml woy ,1;br7*ecl 3ujnpt

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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 statey+- )mkmupx3s m5+hufs 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 l5mp 5x 0w/rl/ 7humaxahf0f(coil produces what kind of change on the ( 5u0wm0rx7mh p/ xlaafhl5/f 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 fieldb lyy7*8w75k rcaq (,y iiq5yk through a loop of wire produces what kind of change5cikk7y,a yl*y(iry5 qw b8q7 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 produces what kind of change on the inu.g4*6nrm lkfo *katie. 1p84snm zm+ ducedoza6nm.8ef k1pn 4k ui*s*4+m l.mgtr $emf$, 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 field anl(evhxngi 23r:f r0)nt7k:g f / yq;vk $emf$ 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 inf 9ui (48k:rs2 spy3;cw2 hlmbg2seytduced current in a conductor will be that which tends to produce whic(s 38 w2h9 s2bp4ef i2gsru;ckt m:yylh 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 held abou (nr1dtbq1/ p(1 mxikve its i/pkx (bnq 1t(md11ru center 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 held b36uspy qqb2*zhko 2+above its center witbub z6sk*2 y+ 2q3hqoph its 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 t+j 4 iwdynpf(vm2+pr.op in a region where the magnetic field vector points strai vdf+rmp(+ 4jwyi 2np.ght up. 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 8; h ijulj*s5rmagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field incri 5r*jjsh;ul8eases?

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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 as(d..9ac2k n jp zdp)qa fpq7-r4v3zi region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disap .a.snjzq( d4q2cpvfr-pz) 7p9a di k3pears?

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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 carriesdvvfgea - 9o1,c7chx f ee*r/6 an ever-increasing current northward. Two coils of wire lie flat on the table, ov,9e/ca*hf e6 rxf gdcveo-7 1ne 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 w7 7svyt udj;9loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fd97s jwvytu7; rom 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 er 34 8wzteynktrmm 2uv0(: l4axis whose direction can be varied. In a region where a 40( rm4 unv eew3l2t:zytmrk8uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotat*8ti db*/or1f wo7 nwqhqo4l;2p5urbed at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's uqw7bdnf ; *oolpo*wr528t1/qbhri4axis 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.f)lh/7tw,k:f qrp k (f
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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 that3dw0)uh ayjx+ 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 fie(/w jdj d4f)xzld. 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 cs2 lcq-.z t/zwysb5.o seet ).onstant velocity through a magnetic field that points straight eceqzz2.y-)tws .b .sost5 /ldown. 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 b91e:bgs ad,c zar 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 transf ih0c69*lkl2jx*zmhg orms

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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 revolutions2bac 5eg2z3px each second. The frequency of tcx b32gz2 e5pahe $emf$ 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 wn5zzdchpk v-10tcj 2k21at +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 devilo6nwe7 m :ena1ii fk5ul42d6y:pbb 1ce 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 th7 tl,p zpep*4he primary coil then it is a 4pp 7,ethzl*p

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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 secondary ,h7f 5pfw,b. ;lt:vi o3lqnc gcoil then it is . p,h ;fq7 :lnlovwtbc3ig5,f 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 po tq*qk q.,,* odjz: :qhb2n2jk 7rgsy l0eea/ywer 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 resonanvde4oza z:m /)t circuit,

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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 inductorabfs)symm34own 4blit0- w b6n58v o2 are connected in series to an ideal battery of constant term2svbm y abtso)n o3b0mfliw- 44wn65 8inal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consu ei y-.bes(q7tant termqu7y-(ie es.binal 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 Lxa y yl/8cmw1hr/-t clel9s/abco,0( 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 and resistance R is connected to af nifm 5rv x3-0h,+ec) q;+iv7 +d2sinatj zhdn $emf$. 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 seriepqhy ( jb3hn /4ce) k/pvwhf23s to a battery. The time constan( 4fqy3hkejnhc phvw/ 3 p/)2bt for 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 ci; 0m pqz4yeyg -x*sj8onnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requy jyi gpmeq*;4xz s08-ired 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 the same units excply ,,*m. gz7wze v+zsept:

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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. Onj6if +-qc7tni 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. In this circuit, the curre7 lna1r c wn7xr+*xgd-nt7+g c1ra xr7*ndxw-ln

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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 circuit changes by what factor when )iu.sr/6 ,qi5 l 9 edefs-bwkhthe frequency is tes kbu q6 l9)w5.hierdif,s-/ripled?

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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 vol8iu6xxs;y oh )r+z .ietage across an inductor is doubled, the inductive reactance of tha;xirusxeyi)z 6+. h8ot 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 acro nml/2s9i yut9ob/4kk ss an inductor approaches zero, the inductive reactance of 9nyuml obik 4 2/ts/k9that 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 connecb*pdstr+61 j rted to an AC power supply. In this circuit, the currerbtpd16*+s rjnt

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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 frxt37jh()r;27b;hh sr ajt mnuequency is triplt (brm j;3atrh2s7junxh; h7) ed?

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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 mya88; jo6 o ,cwyn0geapproaches zero, the capacitive reactance of that capacitgwm,yy cja6 ;o88oe n0or

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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 volt o;hjjo z7i c5pg1*ih:ages of the inductor and capacitor in a Rziohj1 7 j5:*;io gphcLC 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 circuit is defitlvl c*4 ezg0,ned 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 u8((xt(s gsyr n,izk9 of the circuit increases if R increases. When is this stat98 t(skz,rni( (xsyguement 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. T*ppzvzt m *l.-)djn f-he impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuxvs(t q;ytte))v3)e) mqcn ;zjop ,j*it increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance ;zr3yhk u8n 5)*zx9v kig7 xlrboth double in an LRC series circuit, the resonant frequency of gk;*zv9l8 yu5z)h3rxnikr 7xthat 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 wgpdb4r*y uz9eh qen 68a,/p) is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs why(ccsl;h3 lv2flp3y 9en

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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 u o: y3v0c fo ,d*nk*zlb8-zycfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field y vbfo l-k dzo0z, nu:*38cc*yvector 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 radi70xtt*f,.p 8 y,g rh yjjch.jpus 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 m8.cjyxpy.7t f ,jhtj* p0r ,ghagnetic 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 u f(-kw 0bs+ xnlljz-s.niform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the szk+wsjnf0l .(- lx -bloop 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 are +uv-a2 gl-4j3t jjn /-y yf3pnihs;baa 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 chang(ly(b7tz -x+lq 1a 3+yaqsg9jh xprs.es 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 of2bf0f4/e7, gvdodk a6 m u/fbp wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. ,d e4dm/o2f7 bufvb6/0akg fp If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire nao pvn:mv2:9with 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 are 0gn.wqb yf mgcnf25:;a $0.20 \; m^{2}$ 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 horizontall.:kzmim4:qfc1csa -8ste7d3z-yv +qve,is m y at a location where the downward componen- vk1dm s,qqyzc ce.:tifim-m3s8v +e:a7 4szt 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 xrafp i .1w1b0j89cc0g 6xu4lzzojn:m long rotates at a constant angular velocity of 2.f.l0 4j1 i 9a6uwzxx1bpj:0z8cnrg oc 0 rad/s about a vertical axis through 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-sectiona;bd/1f )drsghrkbh )v-s* * jxl 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 turns of wire of ar:akx*) w551)kczksatqf+ z cbm ee hr*v01,xuea $0.090 \; m^{2}$ 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 rectangularf,6 we0nayc a65hbv v9 loops on 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 uni, f vncwv65y6ab0he9aform 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 6 4hgzj 5qgnt8odu;4aae0 6rparea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outpuo8 ;oa/y7 cuze l +hb/h7h;uret of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availaby/ h/8;uo ;uzb7heoa+h erlc7 le. 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 genera/n pzb27j1p gmtor 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 mot*sdmb6cv a, x2or 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 a resistance of 6.00 W. The b0 b/m9 i b6w2axcb,ey3u y6 xqzr.l-wmotor operates on 120 V AC, and when runnin -bwqrx eu66ib20 lz xwbc.ya,/y93mbg at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supha wag1;9 nafqxc.26+esic y/0-tfyg ply. The operating current is 1.0 A. What is the stae y6x;/h-+ n f 0ag.wqgfs9icta2a 1ycrt-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*oyyau /v viu3ch 2jf2,;hhs277 d eq jtc-,uf to a 24-V power supply. The opere qy fj;d,2cuv* o23/7 vh,2 syfuuaj-t7 cihhating 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 ref vhvv1/nk4u5y 4y3- *th1jdmwbu b(psistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thev*w1(bu- vh4t/ y3m5 ykb jn4vfdpuh 1 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 r gkh )e1;ni *8ixisq(q gta/v8educe a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 Ab.p64 dbm0nv4g ag1 uj to flow in the secondary. How many tuad4j buvm 10g.6pn4 gbrns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary i ad8(cx-nr22wtl8vk/o ax9izn a 110-V primary if the 24-V secondary has 100 turns2x82/r-8l ai vkxdo9(zatcw n?

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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 2000rbbn) cz)e.7 e-turn secondary coil. If the current in the secb7)eec z nr.b)ondary 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;5 d0q-kpuwkf a transformer. Assuming 100% efficiency, dk50kufwp- q; how 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 at 10.0 mfo9je2v eov --A. The primary coil operates on 120 V. What does the pe-eo92ovv-jf rimary 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 pribhw2tf ,rp y2f/(q vb5mary coil and 300 turns on its secondary coil. If 120 V at btp2f (rwqyb5vh, 2/f2.0 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 primap438atysz7kf7.3zr: o -bv jlai.hr-;mgn q t ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present 7zo. ag3;ysk-jr8n tl3av q iz.r4m-7:thb fpin 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 turnspyq9m;d rzufgps*i(of s , pea,3:2l8 and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output *:, f83ype ru,gml(; sszpi9f2o pdq acurrent 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 s c3z)xz9jgh ;w.:orjf econdary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outcfxjjgwh3;:.zr o9)z put 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 its secondary has 200 turojf3uxte;y 5 -tk()3e 8 rndfans. If the power input to the primary is 100 W, we can expect the power output of5j n3;r 8u(ya3 ek)edfx-ttof the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usrtxl -mjxh /0fjt ny3hsc1 yia2(v,1 1ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number ofin 2tav,( x1/yxfy01jlcj1 mr thsh-3 turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped9fyz+g -kf8sy up to 4500 V by a transformer and transmitted thyk9sf+-8ygfz rough 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 voltag+vvxs 6y7shrl,nv4d +xj2e(re is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisn+e rv, 6d+vr24v(hxxy js7lstance 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 g vn-s3iq:qu:0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating-v :gsnq:i3u q 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 re-fw5 d3nwt-la sistance of 0.60 W. A generator produces5fltdwn--w 3a 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 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 kbku38 i 6fnyyvm4 x*.V. How much less power would be lost if the power were transmitted at 3000 V v8 bykk fy xmu63*.i4ninstead 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 20 A. It is to be transmiumw ;2 5,/,.qjcx/up ii tuvxvtted on a line with resistance of 0.uiq.w utu;jx v /,pmv,/2xic560 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 power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the hft8 0 :r6fdoccoil's magnetic fielt86:r 0ofdhfc d?

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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. Whx7ezx 1 2 an,fws6 ytqanh8x86xbj /q5at is this circuit' qx86z/61 y7 xwqt8 aexx sjfbn25an,hs 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 i7dd9 )tvmc2 ics 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. Whatn.j:0+p 49khq lxmhx6q uiun- is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the lqbh.*qz8y eofny 7dyzt d6 (6*amz 8bq zyy6 dy*7t( h6o.dnefq*p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What g7tml2bwzyzy7vg( -a 5vwrd+f(8g p ,is the peak current through the rew y,pztbdgy (7lrm 725v a+gw-(zvgf 8sistor?

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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 1(fk tj5ut)v y620-V ac power supply. What is the power dissipated inf )tk(u y5vt6j 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 resistor isfisw3 u+n,k9fy( df+ o $I = 0.80 \sin (240 t)$. 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 res5gzg k yybr2 thm/t 25mm2cn71istor 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 akzeu p(o5g8fbb;:s 4j 50-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 wfvho ,dvr57 lm v*-0u rmr54z+dvy)jinductor 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 26 fsu(j2k2f.sz wk1);gkbvcu .50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactal/fziq rhz-bzgev6/kbia 8rw s /(azrg4)498nce?

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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 sa 3trbhflk0 zgckwyp s-(9) *2eelsv ):ve 1)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* wxlm.weozh*3 n*w)w a 60-mH inductor when 120 V AC at a frequency of 20 kHz is apx) .w* lzoeww3* nwmh*plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil duyscf9)tp(h;rt r9 +boe 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-mF capacitor at 10p3j/ l8ce3: 6sif dknzdi4 tn5 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capa*/zvkhj0e h k9citive 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 do,/x b-f;1rxs wqym qt;es 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 capacitive reactiz irib(5c7u)60+ fencu enn9 ance of a 0.010-mF capacitor be 100 Wznei 6cicu( 597ur in)n+eb 0f?

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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 capacitortj5sv.( /ib rjacs, +r 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 seriesby vox tgkx, )*o9mo:; circuit with 12.0 W resistance, 15.0 W inductive reactance,t:o *ox;yb9)mk gxo,v 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 impedance7d)2zm xej tf9 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriedtf) jz2x7e9m s?

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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 g .dnn.)j(ihocs jw** coil, and 1.0-mF capacitor are connec.wdhinno).sg j(**c j ted 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 s*twn 4(n lvqsmgh z/z2) rn4y3eries with a 20-mH inductor, what is the iw4 nyr4(ls/t hq2mn3)vg z n*zmpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indqeg3y r;2:fkbqlf t* s84ptr :uctor, what is the phase angle at ;pqek q8 24 *3tffblrt:ys:gr1000 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 serib z p2jg*f-ri8es circuit with a 20-mH coil and 1.0-mF capacitor for a total fjbi g r*2p-z8impedance 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 m .hncc)hd+y. is needed in series with a 100-W resistor and 15-mH coil to get a total impedance o .c) cyd.+hnhmf 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 serie(lt( 5fvudj:kxwti6 )1v+ vpfs with a 450-mH inductor at 5000 Hz for a total impedance of 40000 Wdiupf +1vv6(vt:)wx (j5f tkl?

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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 1u:upb mkip(a4(2uw1iv zf6 *m 00-kW resistor at 1.0-MHz for a totalzumbk2( *u :u6(mpw4ai1i vfp 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 with a 20-mF capacitor. What is the imp j) ) )2vlgz2zkef.wfcedance at 100klffvg)2jz )) 2cez.w 0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cap7l6.vurg: kx/ c9q-dirz b7fb acitor at 1.0 kHz for a total impedance of 45-dl:/x6 7u7 rkbf bi9 .vqrgcz 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 am 1hqw; xvb0k )x57zfat 1.0 kHz for a phase a1mxv )bhw ;7f5kq zx0angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a totax/m3dqvvk ; ;9 ikr112efm ieil impedakkee 93i1r1qfm vx;i 2i;m/ dvnce 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 1oq;.obezv2rozvh 714 00-mF capacitor at 120 Hz. What is the phase angoe72 b.qzhzov 1rv4 o;le?

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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 15 u*kbu2vg9*a l:bqvq* aa if;/00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF*bai q2l9:kfa*; ag*uvub/qv 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 100p0 gnwoomb 4 e:*fkng,b*g9(m -W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Wg b*4ognmob9 kpe(f,m g0:* nwhat 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 capacit2pv c9x o o4z0mlz7kc0or of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source.mcz7 k cl0o2v0o4xz9 p 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 containibl1 mj,b8-yjq:x bwr+ng a 50-W resistor, a 10-mF capacitor, and ab b 8l:r1w+-y,jbxmqj 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resist(t)in0w 4ijij or for a phase angle of n( itij4)i 0jw$40^{\circ}$ 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, scjoo +cqxbm*/:noh 4s0 /.byl2f-mu C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivio/+foshucc*-4 bb nloys:/m2 q.0 xmjng 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 12.0 W resistance, 1-bnksz; 7 ofy2znr6)g5.0 W inductive reactance, and 10.0 W capacitive reactance, w6ng;2s)f-zyrno bz 7khen 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 an00e xwpn: hf6k AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of00h9axm+lr3wjpkf. x 60 W and a resistance of 30 W. What is the pohp9 falwk0.+j3x x0 rmwer 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 containing a 50-W resib.k kcd- :ib7bstor, a 10-mF capa-bc i7k .b:bdkcitor, and a 0.45-H inductor, 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 of a 1.0-mF capaj szqs)0 u;vgys75v4ncitor and a 15-mH coil in series?nsss )v4;qg75z v0yj u

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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 withvy6mw i(u-/j fjj6u0a a 4.7-mF capacitor for a resonant frequency of 10um-vufy /(jwjai066j 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-mi: u sma-uiv8-H inductor for a resonant frequency of 100s8-:a iiumu-v0 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 wi xxgo85f/ *d3j5km* v kvz(qpfth a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be jg x3kx kv**5z(/v8dfm5oqp f1000 Hz?

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