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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic f (bldg5;o kmxze,7 b1p*kjky w/ 7y1lilux 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 that sxd x6 h78bv;cthe $emf$ 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 /kdq)9k5 f5ysoj q2)mig( xfp wire in a coil produces what kind of change on the in(5/p9)i ykkgf smdq)o q2xjf5duced $emf$, 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 wir9a;w rb ol3uu*e produces what kind of change on the ind;* wub3 aurlo9uced $emf$, 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 poq/ fju.2 q)rq j*n )jsmo76lv-g izbpj 9z6j1roduces what kind of change on the indu *r gnum1l js2pq )fq. j)z-oj7qj/66jvoiz 9bced $emf$, 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 an tsydpg15pwui : jke ee+k- +76$emf$ 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 ind2 2wvs2 0;htzkw flb 1bg4jwd49am6ykuced current in a conductor will be that which tends to produce which of thdb4h2w6b1w 4z fy;9klsjv20kwa g mt2e 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 :41tn0mf,j/:m muyl )fqj llqon a horizontal table. A bar magnet is held above its center with il), l0jn/: qftlm1yfum :jq4mts 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 horizontz8)obk b,jh hk.jg1(val table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling ma g,jbj8okhhv .1kbz ()gnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a rem3d -s xfj1:v .to5piugion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coptdsv jm51 :io -3.xfuil 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 magneti dua6rxosv 44 gjsh3;/h31d vxc field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induce;1jvxg43a6dhvxd/o3 hus sr4 d 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 2ob:nx /ci 1zuregion where the magnetic field points straight down. The magnetic field dis2i n/ obzuc1:xappears 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 table and cak0)z ect )2kts)6hmairries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current ci 2he0i)k)sc zk6tma)trcles

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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 first. Aq*e lo,7tdojmfv -d2 d1z3wi- 3vg(mn s the north pole enters the wire, the induced current will be (as viewed from abwo2 -3t 1nd z,l7mei-(qfovjv3 gdd*move)

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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 wiri qwzru* 1xsw-3e -bo1e is rotated 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 axis of rotation if the induczxe1u3 -w*1sbi- o rwqed $emf$ 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 speed a6wf(ynwkk d2 /bout 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'sky w6f/ k(w2nd 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.dqjq4j p7o3g1
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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 thattwqps- f.n3z + 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 y hl p)(sg,:s85a evgda magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented int z 6w5dp vo9r.j(jg;x *sa5nwlpa(w1 the east-west direction) is moved northward at constant velocity through a m l(gjw zpxaov;apd6(tj51s *w 9nr.5wagnetic 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 cy9 8 ,tctwpk7ionstant 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 transfqrkm w4dd1*1y0 ;jeayorms

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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 6c(mxjm ny -f5me96*ri0 revolutions each second. The frequency of tx9r-( f6m 5*icemymjnhe $emf$ 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 q;:ko4rqv w9x *mzua, 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 devicebak;knkq84mad9 *xdaz) g 069 -ju yyd 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 second (nx36,ya.iuua cc kt:ary coil contains more loops than the primary coil then icay( tuc 3n.ukix6:a,t is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil cob*kzr16fu r ax 3j4j*s)jm1l pntains more loops than the secondary coilju4 x1)*1sj3lkm rfaj *rpz6b then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power innz4 xv/.zl2zd put

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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 cir + 6cu8e3fqeraz)pd q*cuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal ba2v sn c715.oh-jj *eriks:chsttery of constanhn 1rhic.* j27sesks jv-c5:ot terminal 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 nx+y 6u5i oo7s :wlc4g 8y8 xdf(tad+tin series to an ideal battery of constant5yu7yo4f:(wt6+ xn i8 d +aoscxgltd8 terminal 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 an z3i u:.zvddg6 qt6g5r $emf$. 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 connectey ,z,l iodks)0d 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 time constv-cz1y ) dp:/ ds)iuipant for the circuit represents the time required for i/- )y)1dvsucidppz :the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The9 f3 ax +znmxms9ur,((v.l3pcxo fdb, battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cuz. + p,l(nrc9va(x ,xm33mfsdoxu9f brrent 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 h qa7jtn*6ysh0 ax4pxfz;/d9 nave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the jjy (8 mamj+/7hif 5 tvruir xs,ip,)8current

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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 ci-mkwmglm 6pquds1 j kzy:9 5o92f0 i9nrcuit, the currentqku:0-6z gmyl5ow s29 nmjikp919dm f

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance im ah))j99ubuy,r 4jz6dvd 9g m,meuk1n an ac circuit changes by what factor when the frequency is trizu yhemd g9r9,)9 1mv4bjm6j,)u uak dpled?

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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, gr;:fu6 +wquid2 v(uxe(nup5 the inductive reu r(2wu (u5+vgep:fqxu; i6dnactance of 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 y 5mz6 (bgn,(xuln5pfs fl63fapproaches zero, the inductive reactance of t xf fl5mnf6ns,p(lg3(bu5y6z hat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the 9o,xawqi8l2/xb8ahweac b:+ currenw,i+aqo2a l b9hexw :/8xac8bt

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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 wj nv66elgs4;qhen the frequency is trinqg6 l;6svj4 epled?

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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 cahntvp13uxfzb+/ ,g/ 5d bh en/pacitor approaches zero, the capacitive h gp /e5nbd+t b1u fhn,x/vz/3reactance 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(;vtz 4r.zym f and capacitor in a RLC s(. vtf4ry z;mzeries 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 f+afn m h(3,o+,ce sulcircuit 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- am+4nack/d(h2z xn s impedance of the circuit increases if R increases. Whenh nada(-4znxcs 2/+km is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedancerflbzq/iun oac2(8 .+ 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 increm8*m mu.xo 5hwases 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 capacya-ofaljr 7g dowm /.5k:os fq-/;8riitance both double in an LRC series circuit, the resfi-.ko a/o:;-rw8fdqr gloa7s 5y/ mjonant 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 appljnv2nn8yq0sc(b- yq 1tc3a /v ied 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 seriekcleect +y y 4k/x/r9:s RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.6h/4w vdsznphc )k5 )e20 T. Find the magnetic flux through the loop when )hc/esv46k5 whpzn) dthe 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 si( .slc /ieigyqe -vkc*b17o69ruz+uniform magnetic field of 0.20 T. Find the magnetic flux through the loog 6i7lies cyo9eivcu1/kq+r*( b zs.-p when the plane 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 moco5 uub(- 3tfol;7l;yrfr* p is rotating in a uniform magnetic field of 0.20 -;fobolfu (o3tr7;rul5 py* cT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single l2ygmtpg6, 7ag) l7awsoop 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 changes from+a(ar7hryv p082 6wc8t hjsupw 3i8p v $4.0 \times 10^{-5} \; Wb$ 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 on a avc-9 o(2mt +yfam 6arsquare 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 average y+9- 2coa(6raf mavmtvalue 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 wit 3clche ub5.xz*+)v mfh 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 arjydqho )r, c3dot f)0q6 pdx-.ea $0.20 \; m^{2}$ 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 1fo-lt knv*es;7o q f1the downward component of the Earth's magnetic field iln 1ok;*fv1o t7esqf-s $6.0 \times 10^{-5} \; T$. 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 constant k0oxze 2(0hgt angular velocity of 2.0 rad/s about a vertical axis through (xkge0h 02oztone 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 lo9xy:av6mql :s7w5/9 hg4ucvvj 3aul jops 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 ttd (/ljjl2iln(lw99 r urns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm loi1(zs2, h7f x4hpe: zh v;ubsul1z 3tlng 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 get1h u izl xu;:4h3bsze71 s(,hvp2fzlnerator?

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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 wire2 fjrq e m/we m.**ql4 26zvwvx yuw.-6tl5clc 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 constructg 7umhla zk0*, a simple AC generator with an output of 12 V maximum 7mz0a ,uk*l hgwhen rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a g hfdto82 *koa:kp8m2g enerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The ) ,hdytcod(y 7motor 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 motawfeka 9.g541m0mnn97f v h xdv yuu55or have a resistance of 6.00 W. The motor operates on 120v9 14um5w fvan75f n0dmkyue5 9a .xhg V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V c 39nh2qd*if01wkj c61q l eah 0(tqcopower supply. The operating current is 1.0 0c*1nf c1th2 h9q3clqk 6ai oqd(0wjeA. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power su (k4ao m2ljii. s.ef+ctlwd*;pply. The operating current is 1.0 A at full io lk;adjcm4*tl..swief2+ ( 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 powak lv(9ggj4n)2.gv dwer supply. The operating current is 1.0 A at full speed. What is the n g2vlgdak9.wj)(gv4back $emf$ 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 needektz, a+m57 gjbxd4s(r d 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 transformer causes 14 A to flow qr((3yiyde7 u i9 d,iw5bh;gc in the secondary. How many tu r,7eg ydw3i cd5y(9b;huq(iirns 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 in a 110-V primary if th wn+o-rwho:5*(kg k fme 24-V secondary has 10kg-nf: 5w(oow*m+hkr0 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 pri z70z lnk4j jr0ys.y8fmary coil and a 2000-turn secondary coil. If the current in the secondary j 7rnkyzl8 0s40yj.fzis 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 tr7,9jan pmu ja:ansformer. Assuming 100% efficiency, how many amps at 24 V can flow jaanp9,:7j umin 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 5a omi(6wo/;jt qr8osjv*m- qsign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V.6m* ov o/5o8m;irawqq sj( t-j What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns oczl9 cj*-1hp1gbrj3 jn its secondary coil. If 120 V at 2.0 A is 3gh lcrj bp j-j1c*z19applied 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 coil a2egs(4mmk :7 cabis/b nd 300 turns on its secondary coil. If 120 V ata:/ic7 4m(e2bskm gbs 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its se nd/97a+hlgtg condary has 200 turns. If the input current at the primary is 100 A, we cana/d tn7lh+9gg 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 transfollij2h5em:/ck pms: ;rmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secol /jm 2esp:;:clkhi5mndary 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 toy o+/p.fgy 7 c2xgqg,urns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power gg7y /,+ fgxyo.qco 2poutput 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 120 V.se2e,kcj- w vs+e48zy The voltage is usually stepped up tcs-wekeev8s +,zj2 4yo 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary 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 :f3l9+ njdc* o zn: zmbcp9d,aj zmm9/stepped up to 4500 V by a t m 9 ,lodfj:*d cac+bnm9zzn:j39mzp/ransformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage i,8oo c3kp5 pqe: qti:jnji;+ds usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the;kijnpj,q5id8oo3q :ec : +p t 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 resic-g.r9isyzk7 :q.l y*y: djqa stance 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 ra .rs i:j9 *q-lgdz:k7.ycyqaytio 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 resix.6z2bz (0niro2bh u ystance 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 tu bnbi.6ozy(r 022uhzxrns 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 dow q/n1sro*boyzc.+8pr 2q zl3 uenj- e2n a 6-W line at 1000 V. How much less power would be lost if the power were z*/-s2rpr2qono n.czeye 8qu+b 1lj3 transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a likm. d .vva0r0qne with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the ori avr0.kd.v qm0ginal 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 t( wz5b,m6rtai he coil's magnetic fz ,m(ar65iw tbield?

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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 contanj*s656ne xzhug 1 i :rcgf:1hins a 6.0-W resistor and an 18-H inductor. What is this ci: gf:6 n*sji1e6xg1hzr5uch nrcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage isz)ot23n)q8zws3da dn n;j+h i 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 thlm znj3k8 m;7im.ywa4e 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 ((24xw:q ikd ywh.zns-V AC outlet. What is the resistance of the lamp?hd4:kz2q xs ww.yi( (n

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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 connect:8ae myag0f 31 n fk;ai0d4tqaed to a 120-V ac power supply. What is the peak current through the; 0any8akaf1qa4:0 dfit mg 3e resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power disux/ep*jf ;ta (yark 1,sipated in the rea* ap1; ,/jktf r(xyuesistor?

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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 reeo2,no vh ixbe:-5i ;csistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisq(s wgg:hy2)4a its0t qk0*mntor 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*eb7cre0d yr udc b(uc22z 8vf,k*y 1k-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 o8,oh(yf78bjq,o30 jj+d r o b/d,qkm1cjccj x f 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 2.50sw+7m;wa,g)azdf tnumdxayi9 u20 4z fu -k0;-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-z.c tmbv26mx h/;x fnb q1t.1wmH 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 inductive rey h p72(ivrj3e lx4xb1actance 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 frequencycpmnv-5 6 ixz3(.binfl3az l9 of 20 kHz is appli9 6cbln .fza m(zlvi 33i5x-nped 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. pz0i1mfc4kvldc * hu+ycc h7w-54 w:k50-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-mF capacitor at 10 kHz? ve :akc6c dur9.xkq0ne h54/a

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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 neede,4dx0wt x gfk41s)a y* mh3lmhd to 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 0y 4pi;d26t/qieooex a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacito ge: .pv,xfhc0:(pvvqr be 100 W?,p(cvp :ehgf vx.q :0v

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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 H0;r.s +nxf waiz 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 o-m- g2vh nvm)9tb/zc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0vo-m9 hnbc )-vm2g/ zt W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, a)qjin(w(+b/-z- 2cjh nsl xdn u)dvz/nd 1.0-mF capacitor are connh+vlqjn)-zu-b s z/( d(jwd ncin)/ x2ected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistz9um ./d4mg a6+ dj5u5ubxlheor, 20-mH coil, and 1.0-mF cape d4 a/5 umjzlh5+umg b6d.ux9acitor 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 serie.lk jvp rd,4s9s with a 20-mH inductor, what is the impedance at 100jlv s4,dpr.k9 0 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 inductor, what isu3:e:)vsgfuzo wd g3 4 the phase angle at 1000 Hz d )uoegz f4wv33:ug:s?

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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 serihg vl74:5j qzhes circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzvgjh7q : lhz45?

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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 wyjkw xhfb 0fd0p5r--1tt 9gy3ith a 100-W resistor and 15-mH coil to get a total impedancft1f ky5jpbdr3thy-9xg0-0w e 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 pkzxl)-+y o4pbnwc( * a 450-mH inductor at 5000 Hz for a toocp4ky+(n -pbzw)xl* tal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistorq5r7u1- opuv k52gpd w at 1.0-MHz for a total impedance of 150dpq kg u51wrou5p2-v7 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 connecu4 :gca*ebva bvd 3x2/l)8luited in series with a 20-mF capacitor. What is the impedance ax3)vc2b u8: /ablda4gu* i evlt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a tow/5;1 f0i u 6ojigkc b1jn8atvtalnwa f;uc8g6i voj bi/1t0j15 k impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.z, (f9g 9-iof-snsanr2n yvz :0 kHz for a phase i(f2 zosrzy ,-9-afgs vnnn:9angle 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 ah: a5o-2 xxumqt 1.0 kHz for a total imxxo5:m2q-a hu pedance 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,z 56q: 5ivtkvu:behl:aafh9 -mF capacitor at 120 Hz. What is the phas:heuvbzt,9a5 l6 a 5:fhq:i kve angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if 2n7ml njq1t;gf0z3e6 awv9h j a 100-W resistor, 20-mH coil, and 1.0-mF capaci wz7el n 3t;jfmvn1j 962qah0gtor 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 consi( chb9qdc-9i o8/dac wsts 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. cid(/w-8hd9q b9c co aWhat 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 ae ic2vd4; a85vhlsbx8oxni7 2n inductor of inductive reactance 30 W are cohox82visv e2i8l 7dcn ba5x4;nnected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cir )fjmg ra7 )a/sac ded97)m7ohcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, rf/)gems79a7 m d7ahdac)j )owhen 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 wi0dfcn4xiq0 -f 2z2yva th a 500-W resistor for a phase angle oyf ca-iq4 n 2v0x2df0zf $40^{\circ}$ 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 9ejx)g 4,(rxojf, g(j*w yzo n4,bytn= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in4ny,,n4 t9g(y,or jex (*fo jzbxwgj) 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 12.0 W resistancee-96obz :y4m, j1iq1 df dqups, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sz14yqdb,9ejmi f1psd-:u oq6 upply?

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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 circuihqlfz- .2 j2) d8d mfj vzz;7bs/r.mkit 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 resistancymw3ti1eq)5 f jy,(e id2stx pwx a9+,e of 30 W. What is the powe )edm,yea(2 +t5 qpjf,y ixww1it xs93r 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 circuik0dn dh,b4zd6u: +wkit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecteiw6 +bkd, :kun hd0zd4d 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 capacitor and a 15-mH coil in serikgn9ab76h)r )ur54h-o mvb ares? hor )-vh6a 4um9rn5akb7)grb

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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 ,f7wqus.j/5awznga;j9n: bs e vd*d. a 4.7-mF capacitor for a resonant frequency of j/ s79,gadwb fuj*vse5n; . zna:dwq .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 3.7.22h fjv 3gb)rwfkna. -mH inductor for a resonant frequ .hk.wr2 b3j v)ng2fafency 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 placed in series wx;*,21 vtobz .xfw .2i-xnq3hvp y gejith a 30-W resistor and a 40-mH cozx3bqvji2p e-1v*ftn 2.x ,o y.;hwxgil if the resonant frequency of the circuit is to be 1000 Hz?

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