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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 unitsno nz+/5h;sb-9)nj5e:9t ebagnjsyp 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 -q7gtd wvu 2.sthat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what klq4i+rgig ,ecz2s+: kind of change on the induced g+egi czs :2, ql4+kri$emf$, 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 magne 8fde47qg -xofdj b4d:tic field through a loop of wire produces what kind of cfj:e4f8 gbq47-od x ddhange 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 produces31yxl u*oe 02h9f; iydgv8+m ol9ettc what kind of change on the induced hdoi;l1y 0vf3ute9oc*x 8me2gtly 9+ $emf$, 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 *o af hde+ 1bopfjb(fbm4j s6h(8f75j from a magnetic 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 direction4:e xdz(aqa 4h of an induced current in a conductor will be that whiched:4 a(4ahxzq tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above itk.7idy b a5:pgy+9-gacg *e whs center with its north pole pkb*.9wg eg7yd+a- :cypg ahi5ointing 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 lef ; 4nfk:mz2l:n hr1above its n ehlm:f1nfl 4rz:;2kcenter with 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 top in a region where w::ovaxae r 032 hmaaolt8 -w: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 o-a2x l wwa3rhv8maaot :0:: ethis 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 w k mg4m4 od6h+5qbr0dchere the magnetic field vector points straight up. The magnetic fieldmqo44cr dg0h5 6b dk+m suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetgs2uph/ x/52 g4ajf gsic field points straight down. The magnetic field disappears suddenly. When viewed from above, whas g522gfap/hxjg s4u/ t 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 ta/od x7s8u d,slble and carries an ever-increasing current northward. Two coils of wire lie flat on the tabd8lo u s,7ds/xle, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wirev.d4 +, uzaofeh0dsw/ with the north pole entering first. As the north pole enters the w /u.,o40za+ dhvdwefsire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire o( ce5,o u/iwdis 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 th5 de(icwu/oo, e 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 speed about an ahgx m)jb9u:w)) se,31ya43jbt ipq5 :zkn hi sxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thyu)jj3ke15qwtbisg p nh z:4 , bms):9 h)xai3e 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.88cmhb0fw7 y ;c- 0ls aar7d xge.8pxz
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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 that1 s,rs38 rz ;khrhzs3dnjzv le0*j5 c( 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 fieldu on-.y f.by.t. 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 directi2 zu0p i-n,gj3lxj x:,b-hteuon) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning t -,lxi3n zuj0htjpg 2b-eu, :xhe 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 constant angular velo/9y *vb.ga jhzcity $\omega$ 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 generatozjyri.3br o.*p4;ol e r transforms

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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 revolutrhkzad 3nr:58ions each second. The frequency of the 3krnr h:z 8ad5$emf$ 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 uguv* xv ;1qsxo )-r 6*jtcdxb/sed 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 th1esi c7p-1 qfgat

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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 o*h.4y)t s-rda,g ron more loops than the primary coil t.s-ro*)ngat dy4,hr ohen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the s4f+j7lw/ 2ij u8cim qfecondary coil then it2 +87m/fqilwjicf uj4 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 powmoz-a9 m .ncl v;ai4:ber 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 cxzsu: i0pe ; q0p ph..is/.wbxircuit,

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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 (a6 4pqm3yrbbh i -bmenqi:7/are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the re3m(habb q/6:b n 4qiyi7m rp-esistor 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 dprbp-g q*:6eseries to an ideal battery of constant terminal voltage. At the :-rpb6 pqed*gmoment 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 inductanhn i0 7d-x/mwct c4.y4+cqkq pce 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 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 wi3xov bh ,u4vbh5h.dz0th 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 6yp1sn + cgyu9oqm/7hlk k,u3are connected in series to a battery. The time constant q +37gmy lk s,6uuh/c1npk9y ofor 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 gwac*qnc o8f9y7 :)xlare connected in series to a battery. The battery is suddenly removed from the circuit. The time const 9x w8 *ccoy)a7l:fgnqant 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 hav ybd.+,g2 ,rzjhfftal-o0p f hk 9t(y.e 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 . 9bk ssdqdpbz4tkq/1*m 4 4jzAC 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 an AC power supply mzi. 7k,h-(pasa(u.;m yfkdw. In this circuit, the currenty a i,z(da. skpwu;h-(f 7.kmm

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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 facc :vf)t3jv8czr1zr y8tor when the frequency c 8 :rvy)rzf1j8vz c3tis tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, ti,:j s:n ufk6whe inductive reacnu f:kj:,ws i6tance 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 approa,;wypg) go4 w dj19vjsches zero, the inducti)wjw19g4 v;yspogd j,ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connectedvuwl4gw:5* bz* .zs jr to an AC power supply. In this circuit, the curren zv:z*5w.s r*wublgj4t

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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 cha 94,*2e mgjn;aipqdkikyp,w 9nges by what factor when the frequency iwi4 ;2 ,9yngkmppie *d,jaq9k s tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor aggjwl z;;x oqv521,bcs vd;o gk-4yj +pproaches zero, the capacitive reactangocsqg,o2xzvlgdv; + 4 byk5;;jj1w -ce 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 vo0lp(ctg-u: z:mnw8 t hltages of the inductor and capacitor in a RLC g8(n:-0pzuthclt : wmseries 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 defined a0p;h) qd-lxfq93qq ul s $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increase e33wl09a 8,evbfe4i.a mq.svy1x ypxs if R increases. When is this statementb38.x .e py,4slv3 e190qeaiawyvmfx 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 the circuit increases i(g8)r k4hjpr1pgd)ju h2c 0mxf $X_L$ 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 increases ix1f /s.f8o:7c;oxhd p7nlp aef $X_C$ 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 caq i8blnup u..y+ 6dyy:pacitance both double in an LRC series circuit, the resonant frequenyp.y 6 d :.8bq+uulyincy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. Atlo vo 6*+v4qpy 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 ci1 s tnag ch+4 jiga/;+-ul9fvkrcuit 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 rotatinguca;c)w ;9 bnip:(vzj in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne;(p;n)wauvj czb9:ci tic 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 in4iv)dnqmv ,+2ty+x a)pot2 ru a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when theuq42,ro) t id2+x+ytvampv)n 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 radiusw0b tnaui -aj)81b f/5x4fvx h 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magn 4 a8 0b1bxtfuf/xj5ivnwa )h-etic 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 adjustabl-ptpb*y8;dy d5er6 e 27x5l)dhvmob1uxntg5e 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 changesmuaucw+*m9p cb *d u4, 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 on a squ*:rub puc 8pha3 ko,c/f+d2 foare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the f a*bp ,/cc:f+rdu2hf 8ku 3oopield 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 t 6prig2 pa;n*burns 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 ar fs6uzd:o q,8/ gk/mvnea $0.20 \; m^{2}$ 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 y rz0z g*q;tb0horizontally at a location where the downward ;0b yzqgrt0*zcomponent 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 m lo h+l)/i gnymmj(t *wk8ng rotates at a constant angular velocity of 2. mlh j w+(*)8nky/timg0 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 loopsc)m1z5xodpe3u e0t g; 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 turns ofofpq+ v3lxh pcz:( k01 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 loo1exb ,0 e jg4fr9tatg*ps 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 uniform trgx *,gje4 f1t0ab9emagnetic 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 arer5o p:ar p ;bga 8tu+xmjp70l)a $0.090 \; m^{2}$ 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 wis4/a r v0b(vrtpg*ye 9569l9mtxjd.flt pg- bnh to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil itrt 5n*tlb-vv. g09(y rlfem 6p/gj9x9 bd 4pas $100 \; cm^{2}$, 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 genyluom 0s ghu :+90s, yn68u ym4ez4psuerator 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 *ds esom5tf)uj vi-u.z 3jv( /9az(gshave 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 motor ouc9lk3sd lt84 perates on 120 V kdllc3 uts948AC, 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 power suppl( 1yvmhdibi4ouha sx1p 12(-cy. The operating current is 1.0 A. What is the (4(ih a-2 h 1p bu11mxodcsyivstart-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 6.0m .xhqm3qd efjo+wsx2/4wr 23 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is th3e.2wo /xmj fqr3w xd sh42+qme 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 re*3o9 9qr:yb geljjrruq2 ac;hsco)04sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wh2jrjrs;gl3:cq )q ou4 ecoa9b* 9ryh0 at 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 transformer is needed:;q rkf0nkxd3uxlevj0x9 1t5f 4 1h bd 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 of5 v 3j1gbuquplnbqsq+(;:r 0p a transformer causes 14 A to flow in the secondary. How m;p :s0 p5quqlb1jn(+br vg uq3any turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary ./hz(xp7dl bx in a 110-V primary if the 24-V second(bpxhx ldz. /7ary 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 and a 2000-turn secondavttit/u/15n x ry coil. If the current in the secondary is 3.0 A, what is nt/xit1tv5/u 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% efficiwmz h1w bm.sgp36ol07u. 6g moency, howups6hwm lgo 0 mo6mz37w 1.b.g 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 si5h t 9phc;wvn.gn transformer provides 7500 V at 10.0 mA. The primary coil operates 5;w. 9pnv chhton 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coj .m ibk*ne1 k6bum9jsw7+d l5il and 300 turns on its secondary coil. If 120 V at 2.0 A isnkse7+k.d jlim1 *6b wmb5uj9 applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns or6/3lt sym. nv7d ic-zn its secondary coil. If 12 /sr 6-m.i 7tldyznc3v0 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.x; frei :/y4hstgya8 ;ui.ej+ If the input current at the primary is 100 A, we can expect the output current e.+ 4jsy ;ihatg/er8i: xf;uyat 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 s6tmicy.y 5 xh;econdary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the second 5cmht.i6;xyyary 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 turnsdt 2* hke;xv ag44wn;d and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionangk;4;*d4ex hv2aw tdl 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 usuallyt +g; v zmm:gh2cyb,9e stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. F2vethm;z m9 +bg ,g:cyind 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 currew 6p,4 5q67ydws1cssn oq f8abnt 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 percenpfny sd4 wcqs , 8w675s1abo6qtage 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 is irjt :1;inzc-usually stepped up to 4500 V by a transformer and transmitted through a power line of cj-r 1; :nizittotal 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 resistanczxt6egmk ts4 z /28bg6 bf,l+ce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transzg8xk gs,z+f46mb6eltbc t2/ mission 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 kmcnx6rvx/b zwwc:df) y)v3t4 1 long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due tctfv)rvc:b 4xzw13 )ynd x6w/o 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 V. How much less power would be l1 8fgokvh3gl gc1tq i+;pl-o8ost if the power were transmitted at 3000 V instead of a1t o+ i31 g; vp-clflhg8kqog8t 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 generat gk02.optlooh6 h0 p-,c-fahoor is 440 V at 20 A. It is to be transmitted on a line 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 n,.hplacootpf2-ooh0 k-gh 06 ot 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 theu7- rb 9p: ppiq*bn4ng coil's magnetic figpbppb:4 nu7nq9*i-reld?

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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 con1;n2 9ev62kalsh gwmha:o,iv tains a 6.0-W resistor and an 18-H inductor. What is this circuit's t,o i:9;a ghv2ew6 smka2v1hnlime 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 th0gh, lo +n 6g g.:p1qxddbsju3e 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 120txen gp)ia*,4a/z /um-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the .c-,os)c ia ga8,vmpp lamp?sgap, p -.o)8ia,cvmc

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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 is the lgg74c )e-bfi peak current through the resistor?4gl cf i-)7egb

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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 lapl;)6./w, 1*z bjbj njdpwn120-V ac power supply. What is the power dissipated in the resistora jl. b/nj,b*wd 6l) 1npjw;zp?

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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 rju-1lp*geff*f4bi y )esistor 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 resi;irce i ko t* aw2l-8ib39:jqnstor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorde d7g4 zp*t(b 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 1.01i8c)3ic-)cwmp vsawzg.w -u-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 reacdq j9 eo9rng)bhw+c)5tance of a 2.50-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 reactancqr.aa9 xk 7- kt1xf*5dcta4fw e?

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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 reactance at 1000 Hz6 a5v1qcx pls(?

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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 frequecy7 uo.;f9rn :ua15hxw7vzhtww1, so ncy of 20 kHz is applied :nx,r9ou11 .chwt5 ;yw ah7 zfw7suovto 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 ak;z/oz*f0h)s sdr if:i.)p xa 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacito 4avw2gsrw+w ct l/vqb8);hb4r at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is cvssed, ,5-rqneeded 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 havey7/3:ubn;6o0 p b x,q h whm r9n;kbl1ep3njnn 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 w6 l wn7jk1d+qwfe()6rtbkz; zi7dg 6capacitive reactance of a 0.010-mF capacitor be 100 Wnl6fk d +;wqi7b1w g)jk 7zdw6ze(6tr?

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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 0.00h0+b8k2; a yzj /obodt10-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 1bu36kzc -xfztor 84l15.0 W inductive reactance, and 10.0 W ca4 1-fu 8xb63zroltzk cpacitive 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, 1 ,imcwj0 ,*skyygdg620-mH coil, and 1.0-mF capw,16 myj*igd,k gsyc0acitor are connected 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 ifcr/7/i ou-ps)jrbfl xdm*--bg /pwo) a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar l/7fop wur/xgjip-)-bm-/bcos*dr ) e 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-mH inductor, what is the ip b6w :8ur)+tqaxrg3 lmpedr8xl3bq ugw:r)t 6p a+ance 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 inductw3 gq6qrsb98x or, what is the phase angle at 1000 Hx983q s6gbwqrz?

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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 coil and 1.0x3: bn+5zrzb,fvs *q z-mF capacitfbn s b5rv 3*qz+:zz,xor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resisto8(wc hsxlp k;t6rk6 +vr and 1+8c v r66p twsh;xkkl(5-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put inqgi).vzab. 0r hdyl+l1( sgd; series with a 450-mH inductor at 5000 Hz for a total impedance; dra qb+d01gglv).(l yis.hz 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 put839k;onm b5,xsfni7w in io +e in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150w;+5mnn os7 oi9if8kx, nie b3 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. Wzr;ce w*1b:8bpc ) jochat is the impedanowp*b cjceb) z:1;c r8ce 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-mF capacitokqypy(09etz ud1+; z sr at 1.0 kHz for a total impedance of 4kyt;1 z( epd usq9zy+05 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 1.0 kHz fo6p)s+wpz n 2n,5ba 6 gwraikd;r a phas6karw2b n 5wg+szd6;anp ip), e angle 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 neededph2j6/kf (d cd in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W? 6/kd2dhjpf( c

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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. Wha9d- s*q3 m2 ub/4or nvnbnpds3:(fybkt is the phase ddqub3:4-b*yn of3 /v9mnbs p2kn rs( 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.xjxk-vi, 58fv7bb2mojkpo9/jf 7 4 j i0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF j -v kvpi bfkb7oi2/7jj8 xf9m5,4ojx 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 100-W resistor, a 10.0-mF ca,s a t2;dsq ,qjncd,0xpacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz 0 d 2 x;as,jqdn,,tscqpower supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an idc0:hst1 ppz1, *s;ubt crj)znductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cur:j,dzrstpct z c)0bps1h1;*urent 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 aqe* ;wk:s2wp l9m /dk.px thm/ series RLC circuit containing a 50-W resistor, a 10-tske pwx/d/.:wqhpk2l; *9mm mF capacitor, and a 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 resistoraxz*vx0 79rae for a phase angle of aa*ve 0zx 7r9x$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10. z38 5a/mxn;fumocf ld.e3jj.0 mF. At what frequency should the circuit be driven in order to have maximum .x c/.j3un5;mm zfo3da8j lfe 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 wi- 4mga65ebw; i j/v4pjc1r rsqth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to j4v; jemc - bqg1 wrp/4rasi56a 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 circui/v9jx q*6j jagt 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 resi1fuky r ,rg)rjpk4a2( stance of 30 W. What is the power factorg k r)1kra, yu4rfjp2(?

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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 f 84*fw8z0v-kqfh h/ a wgzh 9wor,h: ;ia8jina 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when c nikz grhw8 v:-4z aai0/hww8qf;f8h,jo9 f *honnected 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 freleff .zs :j-e+y )vh8fquency of a 1.0-mF capacitor and a 15-mH coil in series?yjf:s-) 8f.zl v+efhe

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for aqre q)sfys8 , -ak z/(4ltihc3 resonant frequency oe3kls yrcq-tz (i)h s8f, q/a4f 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 seriesfj+mx)6 ; lkba with a 3.7-mH inductor for a resonant frequency of 1000 H)6;l f axbjmk+z?

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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 with a 30-W resistor0 eevlp6-tbt; and a 40-mH coil if the resonant f;ep6tv -0lbet requency of the circuit is to be 1000 Hz?

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