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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/h az+v(eh 9cf of 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 induction states tx) q-0dt923 i 18z:4 .icfqc7msvfaw fqafpb phat 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 ( bg.lxj *ivm6emwt;7wire in a coil produces what kind of change on the ind 6xj;l g7itw( v.bem*muced $emf$, 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 te pebq;zexei e9;2.: she magnetic field through a loop of wire produces what kind of es: ei2zq.bp;;9 x eeechange 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 a((kkn5qs)i a kind of change on the induces 5i nk(a)kqa(d $emf$, 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 magnep(2sx: jj srd drvh) 4.w1 hada:w.ws(tic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductndxmryr/s1 8f 1v(8llbn +d7uor will be that1 8rlunnbv8sl 1md( f+yrd7/x 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 hzbpl)zm8owxnkhf 4n ,/ 3g5wd7bq9+t orizontal table. A bar magnet is held above its center with its north pole pointing down. The stationogwknw47+b d qf5zxn,z8l/) b9mp3 thary 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 aefqbsx fd+56ay-fz+n* +a4ko horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magne +ae5*fna f6zx+by kqsf+-4odt 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 ta-w9fvvnul 53 pcwog) (ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of cnv9vlo35(fw u g)p-wthe 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 tableruexox0hp2h2 , /:l li top in a region where the magnetic field vector points straight up. The magnetic field suddenly gro 0 illhph2u2o/rxe,x:ws 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 fi03pb*g wy ug1zeld points straig30g zbp* wyg1uht down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tab/f2*i )hgcl)*9 +hfmyt4 djadq 5gcy zle and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either iydjt9ghgqh2f4)m /f* *c ) yld az+c5side 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 74.q f,. qpb0v5qci 2hlvjxzrwith the north pole entering first. As the north pole enters the wire, the induced current will be (as viewediq5v 4q r0vl2,q.zbcf x.p7hj 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 ap zqw/n7 bxa :ueqzd5)h9 3f:kbout an axis whose direction can be varied. In a region where a uniform magnetic field points str9x:)nz :b3fkqw5q ed z7 /auhpaight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular sr2vzfymc09tswig i b(wg*9/ gf:2,xz peed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight downgzzs*,ygiiv(xr:299/ wgftm 2 bfc0w, 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.9 o*j x9(sneiv5 fu1sz2ww,pf
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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 tu/cfxik f / imar5k+:)v,qk2bhat 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 fieiv.nq r06z z6tld. 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 ,w, qz:x,tqgu northward at constant velocity through a magnetic field that points straight down. Make a statement concerni: xq,t,qgzuw,ng 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 rota1j q l ;g4wv6dvl.eh:dtes 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 tranbw4s 71cz cj*psforms

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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 second. n-n-3 v4 0zvt dlmfjt3The frequency of thnnl t3j0 tz-3v4d-fvm 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 dl5 69av va7bguevice 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 thatv tm zi e)6t3o)0egp+d

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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 szrt1 rg1iup/0 econdary coil contains more loops than the primary coil then itpg1 irt1uz /r0 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 primaq kjz 4 ym(l(ylwtbzk5(l0 +,nry coil contains more loops than the secondary coil then it is +5 ,kb(ql0l zlytyjn((zmk4wa

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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 possbr;4rta 8/*amo ex3wer 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 circuit,wdyzb p 73+b8b

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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 arr :okm*t(mm u6e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, trkmmm*o6: (uthe 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 batter qr qcw pmwyz0;0u9)ek.k)b:pej :(ko y of constant terminal voltage. At the mpp r.) qkk muk:wwz0qe(j)9ec0:;boy oment 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 connectgje-d q k1ml)jyrs.w ;dm.56x ed 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 g3c7nmevf*f+hpdm-.w3m:vkr:vn7 z inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ts b)ce(e;q tw v.)i5ugime constant for the circuit represents the time required for the current iugev;.c ))qet(b5ws 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 connexhe0a bf1+ ,cbcted in series to a battery. The battery is suddenly removed from the circuit. The time ,+cbxa 1 hef0bconstant 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 have the same d u wg84no6ah8units 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 7m9ev ixy0g r )gq9a1u;j6vss an AC power 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 wzwykc d u.a4)jv1igby8(7o )an AC power supply. In this circuit, the curreno z)i4)vdu.1 ab7 j(yg8ywwkc t

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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 wh x/cp8a ai6cnb.lx;7 qat factor when the frequency is t 6;8.a q/alcnpc7 xxibripled?

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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 doubl94 v 6kefank;ded, the inductive reactance oa9n vk46fke d;f that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approa9 0syr 0o7 gbocm(ir;v* uqo4oches zero, the inductive reactance of0g*irbv(oo04 qmr oy ;su9co7 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 pouc8 1as(cg: qou2yk um 2oee46wer supply. In this circuit, the curreg8q:22ku(amy4 ue6 cou co es1nt

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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 f. b6zbbzpty -g(e9ky0actor when the frequency is triple e9 . kz(bp-gzyy6bb0td?

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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 approaches zero, the capacyzy;pp./ 2wz xmz tju oc90s,.itip.0 jpuy9cyz2tz;o m/,xws.z ve reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages x)2ui7 vd59* p*nplykas plq5of the inductor and capacitor in a RLC serp5xll*s dnavqui5*p7 y)p 92kies 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 yrokp5d y3 t a5 y) sw/8d/fa.x ih0g;u)-kgusis 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 t.o+u6m.zexd mbe63kdan **s/ h tg7jfhe circuit increases if R increases. When is thia+ sj*uh m*.kgbomf6d. xe/dz en763ts statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of theu 0 wsfo05g.:vume4tq 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 increasu ;q8n ybxvq2h (+rk0kes 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 cauc;900 lpznlza sc+) qpacitance both double in an LRC series circuit, the resonant frequency of thz0pl; nc0 sal q9)zu+cat 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 drive8rl bjh.w; cqj +la- rod(c:a ;7s ,ksck/+slen 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 wv)od1z ye3(9kkt )8kpv v wd*lpkk6*phen

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field :o tc3*5;qbshu:sushof 0.20 T. Find the magnetis: h3 obu*sts5 qu:;hcc 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 un.6p be tbmxf*(iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plxbft*6 .pe(mbane of the loop 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 0.10 m0 ;awd.3hrdc t9kxpr 2t8j-9) glmmzk 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 f8l.gt ;kamx90 m 9h3j2wzp crd-rtd)k ield 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 lyg +*zkuv j40an 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 co ) 95.nzyt p:2t*vmiyps2x brwil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire-*jqvt lx 7pi( on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane otj l7i* p-qv(xf the coil. 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 with 15 tur)r fa1o5 xpqtl81xg-b ns 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 b24- ds z6qeqjr,ni(fand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where h7;ka: rvv1t6cro +jj epve.,the downward component of the Earthpeeatvrjh:k71 v 6ro.v,c j ;+'s magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a cientlcjyxvwf 6,n zzo.3- +;2onstant angular velocity of 2.0 rad/s about a vertical axis tcel,+zo.nxwfz ty 32 ;6inv j-hrough 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 6so ka ;;hr5b-ca( 9-nnxozurhas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tunulx+k8hc5 ; c 5kur1orns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on itsqv66bzjt2:f i8h)k 0+u nrvhj .vah ;i armature. Each loop is 12 cm lov6h )iiv zj. k2q b;uj80:v r+6hanthfng 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 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 arew .znp)/hz i,ga $0.090 \; m^{2}$ 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 Avib w4-3xwv0 fC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is ava 4iw3w xfv-v0bilable. 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 with a man5j 3:uwytty y6bfik-, p (4+puhk /wwximum $emf$ 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 e.2(nddmntx; 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 motoa(ynn2ap.m . jr have a resistance of 6.00 W. The motor operates on 120 V AC, and when runpj2a.na n( .ymning 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 su4p n;3z1l aycvpply. The operating current is 1.0 A. What is the start-up currenv4zl;13y apc nt?

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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 supply.qma9 */ixubc9vu m(:mvscaech.mtf *124 dh4 The operating current is 1.0 A at full speed. What is theu*qbdmi:*(h49vta xcfma/ chv9s.2m meuc 4 1 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 powddq .m/(bq )dy. d iyumd1fb;1a5d2swer supply. The operating current i2/1qds )i1wb5dmda.fy uby q(m d;dd.s 1.0 A at 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 transformere9(jw c :q8khsp,pt6nr;ehe+ 9(pkaq 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 tnpkfe:w, 4zr-k-d*n;;7iskp r nt ;v, kxc .qxransformer causes 14 A to flow in the secondary. How many turns are in the ;:, kpn -f 4-swtc rrxd;nq ;xn.kzp7,kkevi*secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V +;0m2 dbf2) vywy fxffsecondaryydybffvx0 f; 2m2)+fw 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 primary coil and7rylab+49 tej a 2000-turn secondary coil. If + t7ae94ylbjrthe 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% efi2ii8)ubgnoh il n. i52z g2-k(lvp8pficiency, how many amps at 24 V can flow in the secondary82 gl(h8 n 5 i 2-lii.vppnbuiki2z)go?

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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 y jx *1hp)eeg82;voqh sign transformer provides 7500 V at 10.0 mA. The primary coil operates onej*y)v peghxh 81q; o2 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 tfb )grdqkgu/*;tu i(+urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is t( ig;+ kdgbqfruu */)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 tuw*sne6jz8 9xk rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pres*6w xnejkz8 9sent 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 transform 6 gjr 7xej542lt3jqtupjq jsm)61;geer has 100 turns and its secondary has 200 turns. If the imr 2uejjje163 js qqg5jt xt)647gp;lnput current at the primary 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 sz c2isuq3 w6ag wtt73cv9(j .secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seconda2 6uvtgwcs aswt.73jci( 39q zry 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 gq gk3dq n3sb2 )jh/d:has 200 turns. If the pkb3qndh :g/2 3sj)qgd ower input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 5oltj 8c9sa ogt*q1u1120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in 11g uqo 98c ojt*ast5lthe 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 )8xwztk,bm : vof current 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 p m,z )vwk8b:txower 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 2y4ime3ya6/lsvf hg:rt.;z g A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lie2 yl6ygatfr; v.gi /hmsz3:4 ne of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A m*q8mb8mdpk m ;+2cl4pq1bwh generator produces 100 V at 70 A. In order to reduceql12qbm+4mpd8 c8wk mpm ;h b* 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 if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance on- ;;xmlqfd.b f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due tf;.q d;-l bnxmo 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 10eeus25 xn- r(8ugk1d b00 V. How much less power would be lost if the power were transmitted at kgxrbsuu1 8n- (d2ee 53000 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 20 A. It is to be transmitted on a li2vem3l p.2.c*z r;ntw 1 hgkfsck v.2mhsu7y4ne with resistance of 0.60 W. To whafvh3g ts1w2krc.*em4;n7p2 szm2 .y. hlcuk vt 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 5.0ro7;u,sw 2gl fu98cox A. How much energy is stored in the coil's magnetic fi u8c7rxu2o fs9o;g ,lweld?

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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 indt.j17rngr sg:uctor. What is this circuit' :7nr.gjg rts1s 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 (/.ep0h.yx0tvx guia:fbuc 9 rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cu+gy c05z qxpwn;-cz,drrent?

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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 ilw ,2di) . g +xeb s8pzb*bh 1jzwwj5710xrsiis the resistance of the lamp7,d8is5*ix)0 ewlsjbxw.hrz1 +w bpg1jbi z2?

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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 s n+2eym u6/aa5hlo 4ndupply. What is the peak current througho4 52nmdye/+ hau6 aln the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is conne ;*3l/ggsexu k0xkxl,cted to a 120-V ac power supply. What is the power dissipated in thegk3lex0, u*sx;x l/ kg 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 ik24ljuwh41)f p,c ay1mbllh )s $I = 0.80 \sin (240 t)$. 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-Wke6 td5m3 5tz-7bpjb v 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-Wu ;zwhq vj2xr;hk) s93 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 z wuhy(q 7l lhghp,*)2of 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 coi e)sm ywh.i b4oy9.yx7l 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 14.07xrf k 127kciw-mH coil 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 of inductyeu , o4/6rjqd*8s6xl xf :esyho xd38ive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of qk6;:ua fof7fkj7rt1, ft o /i20 kHz is applied t fq61: ,fa tkfko/ r7;7foiujto 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 q ( dncoyc85a plw4nyi85+w4 vcoil 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-mF capacitor at7ya g,b1t8rff,:u3p gnul3wg to 7xo6 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive rehlc9u:yhcp o o6j0bf5;xh 81p actance 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.m*(p 7eoybywe9rw) d 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 capaciti()tvaf3 6yeiw9zssz- ve reactance of a 0.010-mF capacitor be 100 W6s9swz af-(i v)yzt e3?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5pcga s+8o(ykyo *ne1-.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 resisu2 4(w0z1htmh6 t :z ly8ltkrp, ojm*vtance, 15.0 W inductive reactance, and 10.0 W capaciti r kz(t0vhpl*tmz6j h,:4m 8ylu2wto1ve 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 v.,x js*fdt 8c100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ss,* fx8jtc v.deries?

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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, 3dnhj nj-px* 2-sdd -vand 1.0-mF cap vpxj- -nnds3*d d2-jhacitor are connected 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-mHg 24xb3*xnkln inductor, what is the impedance at 1000 Hzg*bxk xn 4ln23?

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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 induckz 5n 6-arjb+wc8mh x0tor, what is the phase angle at 1000 Hz?mzaxck8+nw0r b 6hj-5

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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 ccd-: .khfo2x99 jvj8z 4 votaxoil and 1.0-mF capacitor for a total impedac9-j a2.tf vo8v:hzox9 kj xd4nce 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 series with a 100-W resiivei ma eea0l 64h/1g9stor and 15-mH coil to get a total impedance of 1viehi9ae6 el g4am1/0 10 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 for abaw7 v2evn2b)tmcc* , total imp wmaet2vc*b2, v7c)b nedance 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 /)1gfal q(c q-b6zuriin series with a 100-kW resistor at 1.0-MHz for a total i6z /fcu )rqla(1-gqi bmpedance 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 serieswd xmb8-+ h*y7 lny(krx/a 5fb with a 20-mF capacitor. What is the impedancey8x7khabd*+ /br ynm -f x(w5l 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 series with a 10-m,lo rngm m wewyj)47.(F capacitor at 1.0 kHz for a total impedance of 45 yjg4o,rm m7.(wlnew)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 n .s)d+ td.mo(aq:pbajor u 9y8na7,omvq b9g-eeded in series with a 10-mF capacitor at 1.0 kHz for a phase anglsodna9qb7. oao(qj :r9bv+u8)p ,y m.tgmd- ae 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 30av (r2jrbt0qjs ojc zg8+2jj; z:n3/s-W resistor at 1.0 kHz for a total impedance o80;v jjjnz(qg2+zsjb rtc:/or3 s j 2af 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 Hz. What is the phab94m)hvvw)(c zep wk +se angle?kw)v(c 9whepb 4mz)v +

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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 apf9y/-ui - ru1 viqmj 2/cz6rznd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conneczi ym/-9 p6fjcq1rri vu/-uz2ted 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 consist js4v cz/rt(h2s of a 100-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. v(st4hj cz2r/What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an induceozu5q ;qfm )cjpc5 5/tor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows ic/55)5 zmf cpeq qju;on this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistzbf), s.pxgpnm u l51:or, a 10-mF capacitor, and a 0.45-H inductor, when conne, 1:5) x zm.npslgfubpcted 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 rfph;gi;tt.1 a 500-W resistor for a phase angle otp;;.itg1fhr 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 jt y+.i2(do b; mthk;ga3gfb3= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven hfkagy;mo.it+( gjd 3;b2t b3in order to have 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 )./j1jytoezn 2q-t gz12.0 W resistance, 15.0 W inductive reactance, anz12znoqe.j-jg /)tyt d 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 circuit i s0qw0t 1p2kpos $63^{\circ}$. 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 any7vz,jbtnnm:i ,8/ magx+n9t impedance of 60 W and a resistance of 30 W. What is the pow ,btamnt+i79:jxvn g8mn,z y /er 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 circum4+bb qu2yi7 oit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz m27 4buiy+qobpower supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in zkv/8qh+iimbh: oaur. 3keo2j-,9ocseries? -moihv+az8buq,ce3kr. o2 iok9/ :hj

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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 capc;* jrunsx1ko *, 1*mljjb 3nhacitor for a resonant frequency of 3*hb x *sou*rnl1 ;nm,1 kjcjj10 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 indf3bsr936ja e f1dy po:a7usl)uctor for a resonant frequency l936jasf ye df71u3rpos) ab: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 mut)bqtmo4 s wd b(+53kqst be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 H )b (td5mw+qkoqt s43bz?

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