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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 flux exxn./xb *d nm-vz:keu / v5swt:cept

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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 pqcp38 dp9- u kviyiz .(.ro:vstates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loy m o4hky278coops of wire in a coil produces what kind of change on the i8 h k2ooymy4c7nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces whhjf5+3y k-wm l9a bma,at kind of change m,hkyb9+5afa jm- l3won the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of changema8f rys, 8k-m*g8cfw on the induced,cm8 aw 8*8gk ffrs-ym $emf$, 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 magne pb+d2cc7/gl wdj*g4 qtic 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 curr llo5/f k3doi*ent in a conductor will be that which tends to produce whif/lklo 3 i5d*och 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 helqrh4 q6nw+f o* 6u4fjld above its center with its north pole pointing down. The stationary magnet indu6 f6uo44jqwh*qrnlf+ ces (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 p g )- gdk- pakkk7npxiq0-5l6flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, tk-)56 pd-pkxl 0 kpggki-7 aqnhe 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 wh wn ko;i5jlwlx6;w) n60uv*dp ere 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 coil as the field fd n6u; lnw; 5*vjiwx ko60w)plades?

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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 magnetic fieldkix7.vs4xsi6 dvbo, 9 vector points straight up. The ma47. 96vsb, iodksvxixgnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetao 01g-hoz-biu8xhu3z k- 8slic field b-gz1z - ax0ui3u8olhsh8k-opoints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field 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 carries an ever1nd c9 a6doxo5w jlvkk4ns:) z1i +v+f-increasing current northward. Two coils of wire lie flat on the table, one on vw6+ 5kkn fi9xcz)o4ddos 1+ :n1lavjeither 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 ep.u hk/x. 3u(vc5 xqaof wire with the north pole entering first. As the north pole enters the wire, the induced current will be (ask.qcaxx/ h.p vu e3(5u 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/r qz+4csxi6mga pu 9 oxf)7/x is rotated at constant angular speed about an axis whose direction ca64 qg zmrx+uaf io x)p/x7/9csn 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 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 speedy 0dbkf+e + xixxgbug020;on* about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatiobu*x+0;0 bx f2digyeon0+gkx n 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.a 8kbc-; hc4mg
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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 that av*jzxp;jj 5m8n $emf$ 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 fi x*8gnm7. brfaeld. 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 directcvtmm,i*c8bg et pf3+u i,/d4ion) is moved northward at constant velocity through a magneticmv/ct df*ui mb+,c g,p3i 4t8e 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 rocro4 ulhk3 um8 kk77 :bry.kq8tates 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 tranh4 r829yth9mj:hbrae/v-n cw sforms

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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. The freay ra8*.:viq wq.egt:e:5p qrquency of tqeg.rp: .vqiy:8q5wat ra*:ehe $emf$ 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 ufo/jskj-7mqx ,g76 qv 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 deviceirz,ndfs e5o*w;c 3;x that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains mor+t-n j gxt)-/uzz.owhi0 ouo.ulz)8se loops than the primary coil then it is )nut+-ol ow8z) 0zixoz-uu s t. ./ghja

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary f: jj1/46n,srj.q msv(ygt vgcoil . n vjmgyq j:1sr s6(/4,vfjgtthen 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, tht- /ka*g(s:uykyo nc z ;,wtr+e power 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 ci v;5i 9fnv7qjrrcuit,

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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 battery of consta pybhbbbh9i08 -8p;m int terminal ibbbp byh0hip 8;89-m 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 con ofomj: 1lrrgm lq)9o:gf/,3nnected in series to an ideal battery of constant terminal voltage. gnm1r)ooofml9q / :fl,j: gr3 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 conz.28gjkc :ahh.gowt 7tn,k 2e nected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista+e ).rph e8jaunce 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 ddnc,,lzid54cfm:ghu 9- ;v dbattery. The time constant for the circuit represents the time required fouvgf ,dhnlc,z9d-4 ;m5 :dcidr 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. The batti0xu);6,pive i vi0ejery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease; iivi6je)epi, ux 0v0 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 hav7 scootm97uf2x pea.e,8 3unpe 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 vz89cu,b;x em pb7f 6gthis 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. Inuam.5+.izdu7 .tj icy this circuit, the curren yci57duj+z.mu i..att

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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*vg*pip*9eqs lk* 6ym changes by what factor when the frequency is tripis *vl9g6*qy *mpk *epled?

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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 iwij c82j) luy8nductor is doubled, the inductive reactanceju8j2 liw8c )y 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 approaches zero, the ind ;byk9bs 7)bxxar ,mn.uctive react, y9mx;sb) kb raxb7.nance 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 connected to an AC power supply. In this circuit, the curre3s (wmcfvctb q+lmd; 68j2zl/ *k.noh bct *f2 jw.mmlo/6d3l 8 qv(nksc+hz ;nt

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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 w9-0ym4n)ra t0b5ps fe,ou ydehat factor when the frequency is triple9f4, -5ydob 0pe )y amts0eunrd?

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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 capaci ::qfbjy pd 4x ouo42w/+8gdfytor approaches zero, the capacit8f:4bw:y2+4 ou d /gxy pqofdjive 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 of the inductor and capacito7awn ;2etlx 5sr in a RLC5sle tw2 ;x7na series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circq(3m 6tqrv xrjiau qq;2r7)2 cuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increacwc6r n x(2hl:e*g:v qses. When is thisw::g6hqc(ve*rn lx c2 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 o/m77 k3a)9e2pm lhnc4zq whqkf 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 impedax30dt (:xyezt0so 161xxgj.hkaklm / nce of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC serier fza13 hkfpvcr wds5)e)d2aj*t : k81s circuit, the resonant frequency of that circuit d5k3tr1c2f:)v s1ef)a ahzdk*pr 8wj 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. At resona;3dmy b vwa4x(m9d7 nqprnn ,/nce,

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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 -ni . ctyrq,r(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 rot84t ctl1pip w,ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when t4 c,tplp81i twhe 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 rotatina;d; 5z ki(ae,qf2cdag in a uniform magnetic field of 0.20 T.;5daz ;kqfe,( caai2d Find the magnetic flux through the loop 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 m is roy/ oox -v04iuetating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lo xo4ouy0i v/e-op 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 loop is /* mzl;amcfw:cfd,gp*4j j1 jreduced 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 u1 i ;fdhb6ax:n*6z.m dvkom8 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 vf-y-rezt 5 (4.ab,egnxb(d39 x jpzfturns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendia-9x,(zxgne(pzbte d5 frvj -y.f3b4cular to the plane of 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 1 qc h8eqtu9 n3k5sd2kwith 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 area ,4sada6 bcvts+ lelya d:, x+7gs;g*i$0.20 \; m^{2}$ 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 zuti( j-7j8t3fm0 gf+buhi a4x8g)zpm flies horizontally at a location where the downward comf-j8u3 ip tigz0xfh +(ajtb)umz84g7 ponent 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 long rotates at a constant angula0 pfihper j5j)h r5if(fj1)*wv (r:snr velocity of 2.0 rad/s about a vertip 1r(5h ri5)(fei) jr0nw :fjj*vsphfcal axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops andz p4(ayrfo+ gp,re0a/ wxfv-a*q-m 5u 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 ofj5d;foy+q 8a r 100 turns 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 lohy2; n(pu(ixpops 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 magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output vol2upxyphn;((i tage 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 consbuew06y llsbym9 3 ;soom+l4)ists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12 V) xmwhay1f. y4 bw5)2os3cgf m maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If t3 wfa)2 x. )4oswg yb5hfcymm1he 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 max0xc5oynkp : 14tb/e xximum $emf$ 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.b.i)4w:7hwh6 4r.in bajweo u 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 motorj p- 04r. 2rnzg7vbumb have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed ib2n 7mbrvp ju4g.z0r-t 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 res0bw swqfxn(p 0uzf,) -istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the st pu(qfwwzf0s n0x,)-bart-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 supply.gwpvj18e d )01h2xh(1etnwap The operating current is 1.0 A at p1h (vt1adx8wphgen12wj ) 0efull 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 d4c/ nnrovb+ n ggn(5,qeg:s*is connected to a 24-V power supply. The oper5ng*( dnqrgobs4+c:vnneg /, ating current is 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 transformer is needed to reduregruy;y m4( 5ce 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 1rfha ,ww i,/5t4 A to flow in the secondary. How many turf5w ,/artw,hi ns 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 t,mejdl+v0e7nhx a l 5rt93f4 murns are necessary in a 110-V primary if the 24-V secondary has 100 tur te7+94, l 5ljmem3hvxrfa0dnns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists 68movht x9jp6 of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A 9pv8xtm66 joh, 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 a).li6gepn,o . t c5 qgk*gg kx55p4ik100% efficiency, how many amps at 24 V can flow in the l654)p5 .gxkn* .tpai ,qi5 okgggek csecondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign t ;ccccxb1jcj:yj2 ;( dransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the1 j;j;(dyb:ccc xc2jc 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 anj,kh ury 824l3vezr z9d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present ink h8vzu94, lrr2j 3zey 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 on itzm4 ih/ d6z(h-5j+pagp +trvls secondary coil. If +l6vm 5zg+ 4phrdh zpi(a/-jt 120 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 5+g2qe:uhz7 q,j psc nhas 200 turns. If the input current at the primary is 100 A, we caq5 e +g7:2pqzn,h sujcn 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 secondary oq,0hgzc3p x:q b*k 25o*apfc has 200 turns. If the input voltage to the primary :*qxoo *k c52c z,0qpaphbf3gis 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer ha48ryw8qitb +j+v5 :tmiu* gcm7ka,p rs 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W 7cb+a,j+rim:mg wtt4y8r ikqv5 u8p*, 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 120 V. The voltage is usually steimoc*n:q /pd(izecj 52dt y+wkhd k.906s4st pped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turnsi4 6k q+c:des.dy wm0jds 2hkt9(*o c5nitp/ z 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,9a7 ao9kk7kh f(ep pk stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find tap79 apkef, 79kkho(khe 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 a nlpyo* i+da+-8rm4 rab c*t(zt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the t-+ l4drmyana*( ztpo cri+8 *bransmission 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 cy0n(cz.xs)w0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy .0x)z csn(yw cwould 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 of 0.6cm/an3 msd30hykjq 4- 0 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of thecm 3sna-h4j3d /0 kmqy 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 powek :u9 gww;.cipc:+cjd s sr/6;nyxcy5r would be lost if the power were transmitted at 3000 V instead of at 1wj dp si:y.uyccs;9rccn 5g6 k+w/ ;:x000 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 l3pse) 0t zhci6ine with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if thestpe h)ci60z 3 power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coi f:8-rrp f/w 4o5jx.m i)kxfdcl's maj-5fk wdo f:m)4cr8ix /pxf.rgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. b q qceid1 qvpjz;.i nz;c0m9t:527tf What is this circuit's time cons5bmcq2nt pei9:zd;v.0q qz f;j7 c t1itant?

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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 wheree xra.jttb7-gdg.(d;tu iim88 w 7z0 b the 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 placzju dvpfi a0. ghl1:7.+:k kpfed into a 120-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 1nbqf , f ha11rx(d(u9e20-V AC outlet. What is the resistance of the lamp?ehau(1(1b n dqrxf9,f

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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 conf4 7mhv6o52ahy sm 6dynected to a 120-V ac power supply. What is the peak current through the resistoo5 s4av6y2ymf6hh md7r?

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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 9 do:l)cal7(rcc v, anto a 120-V ac power supply. What is the power dissipated in t da ,noc):7a9( lccrlvhe 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 il95cu 0s(zm;fp2 exscq+g el/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-W resistor-t:hitdd qj:1*( cfhwoxg; - n 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 resis1rnpo3u 8om 6stor 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 reactancmj0v )-9vmnpc6oxc 5e-us(5i jahi 7ie of 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.k2+py*zrs+olnq)t 0b 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 cfcrm; u:t* k +7qt.9 wd1qpvqvoil 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 i7 a8 l:*qc-s5wdg0yxz g zy,z9o/tvcinductive 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 frey a 6 ,hio zf4u4j,vd1w8z;0hpdr- zjdquency of 20 kHz is applie4-vj,z4d68 zd, ur;hd1pyafhoj0 w zid 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 thro3z)np,aghufzu s:* cx2,.k mekfv 7n3ugh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitexi2q md br51ef-s9m2 or at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 ,3wl3j(pxt4 0 4xzjloe4/.)r +wnbq jncxbsrW 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 capacitork)qurf/1e 7fr have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacig y)s4g94l3pw7 y hwiotor be 100 W?p 4)wy3 749yl sghigow

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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 5sd e -*u11bnf aj1yhfn8fy1 w5.0 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, )8uy 16 e)emdrxn 7uxh15.0 W inductive reactance, and 10.0 W capacnd 7ymxe 6u1 e8))rxuhitive 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 100r pgao,:o z1wayy 6l29-W resistor, 20-mH coil, and 1.0-mF capacitor wpoa yz6:1 ,9r2l oygaare 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 ,lgrwnyyb 1/v w: 20jk sed2-hat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriekw0j: b/ dy-yn2 wvhger2 l,1ss?

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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 il )d. )nd5z qnyzgu3v+z(ehhsuq-:;v nductor, what is the impedance atl:q. n(dvzqez u +s)y;n5-dvg)hhu3z 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 inductor, what uos5w) 9; g,,l jcca/ +3mwbjgt,nbkois the phase an5bob, cg o,w j /g nstcwklj);+um9a,3gle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed 2e)jo1bxe 3u5mpsddxl2l:7 r/a 6iiiin a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance)3rs2el6jx21/i i:u d5daxpb moie l7 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 neeb4ow2p4z:gq mded in series with a 100-W resistor and 15-4m :2qpw 4obgzmH 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 in 7 * zevbem*7gxu0ygxdmy hl(ag0 )f9. series with a 450-mH inductor at 5000 Hz for a total impeylx70 9 )g m*exfz*g7.(bv0dghuyaemdance 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 resistor ahf-8b) 5 ul/ow5bg0h dkw;vlct 1.0-MHz for a total impedance wbwhbf g5c5l0o-uh;l dkv/8) of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What a9ei y:qc:za9 is the impedanie:qa:9 z9a cyce 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 capacitor at 1k h9 ,s eq v6hr+g0:yo3qof;kp.0 kHz for a totalq:h0gh3+ k sq;r9pyeo,kf 6o v 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 1ql0v.o3099 kpf6c gg 8k sqzgb0-mF capacitor at 1.0 kHz for a phase angle 9 cggk9p0z0v o.8blqk3 q6fsgof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz f rvtn88wf )mqk(7 b+hfor a total impedance of 45vb tm8(f)n 8+f7qrhkw 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. Whattjfjlu6/c s1j)ojr9fg i; 80e is the phase ajc09)ie fut l jfr81/g6osjj;ngle?

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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 a 100-W resistor, 20-mH coil, an axd)r gnq:+y/d 1.0-mF capacitor are connected in series?rd/q)ay+x n: g

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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 resgstm:8a (ei 2vh(x uwmpa* 6w9istor, a 10.0-mF capacitor, and a 0.350-H inducto9gthi:wp8(ew 6mm 2v(a*s axur. The circuit is connected to a 120-V, 60-Hz power 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 c9n8,iw 49ah n(ugbg ukapacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 9hn(aik w9,8bugu g4n60-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 am5ufnd. 6oa +rxzi 8e;i7*lw n series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suwnadile;5xzr* .6m+n8if7oupply?

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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 resistor cta l,qr+;9v pfor a phase angle o,9plarc ;vt+qf $40^{\circ}$ 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 =oiuxt, 18lw v7ofxbc8n 8i 3hgp3g- 9h 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivibw 8c-xi3n9f io8g vtu8p, lhxgoh713ng source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance,8bxu2ycaz4 b , 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V 8yx a4bc2,zubpower 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 um.nadi- hgmz-:. q;h AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resisth9 z )dzmn*u8 4hyatd-ance of 30 W. What is the power factoh 4zad8my)dn-9zu* thr?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rpw)h4k2jtugfyh 4:6is 5;o hyesistor, a 10y4j f;5ksp oi wh g4yt62)u:hh-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacg4o ahn *,pc6iitor and a 15-mH coil in series? h*ga npoi6c4,

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant frequqz8 :gm0axz/i ency of 10 kHz? mg8 :qxzzai0/

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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-mz:cz c/vihpgy3 : u1w-wvwt,2 H inductor for a resonant frequency of 1000 Hzy-iwc 2g/1u vwzw3 :,pzvct:h?

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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 r,81oh6 upjgp resistor and a 40-mH coil if the resonant frequency of the circuit is to bhpr ,1g6jup8oe 1000 Hz?

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