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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 uzcg ,8r wleei)r:y5ly 5;ky85 g q.hgof 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 sta,b,b4 s) fouc sc5q*qates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil pro0-fafru8ad0uo0aeah2hk. ys;1y g o6 duces what kind of change on the induced asy06uof .euay8-f 1r h2o;adgh0a0 k$emf$, 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 loo( lp6x ,26zcqms:hwfop of wire produces what kind of change pf ,x (hwzcqm66 2:sloon 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 amaz1-3n+sc uv loop of wire produces what kind of change on the inducedv a-su+m31ncz $emf$, 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 removed1n7.6v+wiyvs 6ym(3a0tvaxzunx c8m 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 directi 3/kf8exxmiw4k 2iwcjrswhh 37 w,/ g2on of an induced current in a conductor will bej rihw/ekh 4/s3ki,g27c2w wm3 x8w xf that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is he+ v2 x 2,zxunmppdn.n:ld above its center with its north pole pointing down. The sta2:n.p +xmz 2nup,dnvxtionary 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 magn3; y9 ut)l ztujekvdf(:a-w;l et is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abou elyawt fj:z)(9 ;lktvu-d;3 ve)

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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 the magnetic field vector po0nf jyjz9uut; -fxa3 p ,*nsd6ints straight up. The magnetic field vanishes suddenly. When viewsa ntnj6u,3yd0f u9;*z- xjfped from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fienaqfd4/nd h qaa5e119, 0 xinsld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this qn 01dnnf/a,iaxd4 q e59ah1scoil 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 tc9w1/s * q4ad4q m;sdgx0e oceable top in a region where the magnetic field points qow;*e1gm9ad 0esx4 d4qsc c/ 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 g:hlg .i.r biz6 :qxz+zvf)4y lies on a horizontal table and carries 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 currengr i+g6lzh.f b:ziy)qxz4:. vt circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering fd; +9pn;scvfknc.a 0a 2nyar, irst. As the north pole enters the wire, the induced cucnyf scr+,2kv;.n0p 9 adana; rrent 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 is ro3)jwv+arh4p 7 jvf-pytated at constant angular speed about an axis whose directiojvp74 y-ahvw+)3fjr pn 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 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 a36uwr 0v az5vk;k 4bscn axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of tau b6;5034skz kwrc vvhe 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.u;v8ytfxh/c ov. rj /8
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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 thlt3 w)j 4mf-m g uap4d5hg*w7gat 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 fielsx.gd.b a7z+sb f 4/vbx.d )ybg wl*5cd. 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 thlh /m je8 +yqvve:v43be east-west direction) is moved northward at constant velocity through a magnetic field that po v4mjq:8 eh/vbl 3+yevints 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 re g+d,t)q5gdd4 gk;kconstant 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 jc/p;0z9xdpr0y7hj v 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 revolutions each second. The frequency of0q :w4bysdvr7 the 740d:vbsrwy q $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tos6 9upteo9x,0 yu7 kus

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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 de7 ,jz5y q.85wb:vl an rzsyqe1vice 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 coilm)8buvdlz ,z net s8*2 contains more loops than the primary coil then it is)n8t ,*28 zbdmseulz v 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 secondar.q2hdfzt h ck2b 06*im, slqm4y coil ttq,.ibhs2c 0l* m62kqd m4h fzhen 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 powqw2 fx 7go9+s8tvpz9 oer 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 cireijsc ppk8q,:/xs-zn 6,+ixrcuit,

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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 conbnhb0j io5i0(stant terminal voltage. At the moment contact is made with the battery, the voltage across the 0obn5i( j0ihb resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series2jf,ld 9ga t)w to an ideal battery of constant terminal voltage. At the moment contact is made wt9w, dal f2gj)ith 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(.bo1qr) 6rt7ymy lux and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductant 9;p8*krupm: n( o:eat0 nmvjce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to ak1no/+z0lfb; *3he2xrp mwdtv8 fka 1 battery. The time constant for the circuit represents the time required for the current to reachv*lhxf/zp;d 1t0fok rb83 k1awn em+2

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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 connec x9mrr 46a8, 3o*tosf6je2taaa-/p bcxsmha 0 ted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for a oa s 0 aas3x emr/,xm46629-ctaob*8 hjftprthe current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units e:i-oue hhqxl 4(ca8be ;h 6u3rxcept:

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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 curregnu3o6w+fw 7 bnt

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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 (mp g mo,rywhh*ki:.0j sxu( 4circuit, the currenth .0, *4 jpymsom:uwx(i (kghr

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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 factn3cjcn yai19 sjovv 4)w 2t l5n(k1px4or when the frequency is 1wn )k4 ca3(its5 x4novypjnl2c 1vj9tripled?

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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 in(5mlq*df 6) s+p b(:xo xp nqg2a(ntepductor is doubled, the inductive reactance of that inducp:lb+5)( nxfx(*dgmsa6q(pqntp eo 2tor

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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 indukybu7q yg58p0t ow ,85, qlqmhctor approaches zero, the inductiqq lpgwh,85 qtyouy8b 0km,57ve 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 connected to an AC bkh82sicc; nd 8trv ln*k7kof4,x -r3power supply. In this circuit, the current8, 3 tnsvb2rnkoxcikf;4l - drk ch87*

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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 circuity ,z3q/n.mqsfmtu ua c lod+818(llc- changes by what factor when the frequency is lu/ocl m18+d mzqayc-3q.st 8f,n( lutripled?

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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 voltahvz/,jg 9(9 *axknieyyvo: 3pge across a capacitor approaches zero, the capaci9hop,n x9(3aey yvj/:zgiv k*tive 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 v ov82ar /z;rxkoltages of the inductor and capacitor in a RLC x o/8; kr2azrvseries 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 definedhs/+-cu fa 6nf .p ;)olujh )y/v-tsfb 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 circc/;0zkd+rj.gb f 6dq62 yumtguit increases if R increases. When is this stajdgbd gym06tkrzu. 26/q;f+ c tement 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 c -:dorprwm87*z(.9 pbtt zkibircuit 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 n nmd )pr-(.b(kp5uvi 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 thpj3ujj- . ow-0 z1itine capacitance both double in an LRC series circuit, the pi 3nzio.j1 tw0 -jju-resonant 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 appliedy8:xh jitau4 ) up/h)d voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit ky2t os;7lpl 8pe r xkvpn,o.m03np;.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 0.1nt(*r xn /5nf9 tiks0z0 m is rotating in a uniform magnetic field of 0.20 T. Find the ma0 f /ksi9nn ntzx(*tr5gnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.nle)ui+j4n w 6 / 8ozs0*k1rmd-uzb co10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux tw)/uzn oil0s r -bz8ndemc+1o6 u 4jk*hrough 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 rotating in a uniform *+8ld queh*q,v( wo;s9n kwy1azy e0fmagnetic field of 0.20 * 9*vyfwq+8(zned q 1 ,sak;0hleouywT. 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 adjskk3f8etvff 7:1 z+7*)bc c9t miq cmyustable 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 change0v0qn5d 7qwng84c) gg sg9 mges 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 20(x odgp,txm jf1jeg, -cyh 3.) -osgoso 00xj(0 turns of wire on a square 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 avera(xyjoo s1mx- e3gx cj .,,of)g0hgp-0o s(jtdge 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 turns and an area of ki3fdzho 6ix f)68r 8y$0.40 \; m^{2}$ 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 3hz3h7roj bl4ug2qh+and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a lq, *jpz5sf i,vocation where the downward component of the Earth's ms , qzivj,5f*pagnetic 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 thatp;+znz l. rmklb6l2n 1 is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axi1plzl2bz;n l n.r km+6s 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 has0xpd8lj s+qct :9zam/ 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turnsz/tc* dq 3/ovjk01kft 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 loo / 4gza nau7tzi:xi0:ip is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axag:i/t:ux 70i ia4zz nis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists 9w1 abqyeq mtde6b,:4 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 gen+ pnfti;/p(oi erator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the;nifit/o(+pp 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 maximug6b.gne,uq4 *e6i ,f vzo,plh m $emf$ 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 6.00t1 cm t*hrd0 vh5,ef:i8 b;sjk 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 operat plc(1z 4vh ;ih l3w6ym*, *p,tczsmypes on 120 V AC, a*c,p6cyllt*zp zs,m p3 (h1mv ;w4yhind 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 to5a9594oo v.o4 jvwku(ktmorr a 24-V power supply. The operating current is 1.0 A. What is the 9v vjo(9okkw.aormrto 55u 44start-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 : s k39xn1ecy/ .kyo1,avet kza 24-V power supply. The operating current is 1.0 A at full an 1ky3c,9 t.ek 1ysezv/ox:kspeed. 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 connyy j +b*9.qy8w;t ll oht8vzis6;ov3eected to a 24-V power supply. The ope+ty6 o ;88v lbys.*yeqv3hotjw; zil9rating 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 bht1u: 9jwkk, needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to6,ip.u vt zq/t+. bhqiims r38 flow in the secondary. How many turns are in vqu 3i.8rq/6pm . hts,ziibt+ 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 njh-2)xr-; 8gan,eqttzu e3 :q)l ukllecessary in a 110-V primary if the 24-V secondary has 100 r)euzt 2qa txelj8q: gl -k)nu,l;3h- turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consiotb q**j(fdk ffpo1- 8yym+0z sts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primar8jbpdq* omft*1 ky(0z+o-fyf y?

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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%udv)m7;xw,w jx2mqw7 efficiency, how many amps at 24 V can flow in the727) vxq ;mwjwuxw,dm 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 ah 1kr0tc2tx 3v5n2mrob 4sp67 cmin)w neon sign transformer provides 7500 V at 10.0 mA. The primary m cmbwxntrs 2i04 t56rhkc12o7n3pv)coil operates on 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 co*1i70chdq unicawo8iolq s8(o1 +i :qil and 300 turns on its secondary coil. If 18q7+uo 8i1c(i: ao1 qqhc i0ilw*o snd20 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer hasz 0ho22 wkkly2 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present 2 2yokz2k 0whlin 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 trav5ko cxyt/k19nsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output yk91 co vx5/tkcurrent 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 dxy cq3;rc t;)turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect ttc;;d3q)r x cyhe 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 has 100 turns and its secondary has 200 turns2 w fv.y0q9w+ qekr+rk. If t2qwfq+ y rrv ek+w90.khe power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 6r29tmw7r /vhd 0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throughvht9 /2mw d7rr 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 voltadl owkn359 1kbm75 nekhc;5v.e0du gcs.b-nige is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistakn 5hcb we.nm -dd39gs;uol .b5e0v51 nk k7icnce 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 is usuixmk c9)*9cpcg6 gtze(,dmk; ally stepped up to 4500 V by a transformer and transmitted thzek ;9* mc9mkd)i6 tcg(c,xg prough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistancejhc,i sys.6wz u6n7o* 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 stis* ucw6h.zn7o6 ,yjs epped 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 5mvc/abr ;u/-9q 8 mo9c +hvelq0 km long has a total resistance 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 ratio of 100:1. What percentage of the original energy is lost whe hl; m9om8ecacvb//+q9ur q-v n 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-v2u+yaos 86;rmn*9bne3 qlzq W line at 1000 V. How much less power would be lost if the power were transmitt8n *zbuq9yr; aon623leqv+ msed 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+8ng7s1ueisyd-g(s6k e fo t5 transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if ths81+ssenk(ygd 7- ei o 5ftug6e 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-rpj*8 9 epnf+r)lux/gvxg y0 ka)yx5 in the coil'luyxxk e9 +*gvn)/)xpfrj 05pr8y ag- s magnetic 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 ant1 fvmp .d+wx/ 18-H inductor. What is this circuit's .tpvw1 d/xf+m 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 is 120gc8erc; pt:p7 3nxo mxk7,. qk V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cv1ww m n2umd0:e8a w:iurrent?

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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 intm:plw / 9a3ykvo a 120-V AC outlet. What is the resistance of the lamp /yv:kp9m3lwa ?

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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 pu h jy(dn5 k5ytzt(zrs-6d;q/ower supply. What is the peak current through the/krszn;q5yy(tdj5(uzt -hd 6 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. Wham hjzn6q8w5*, xrx nv)t is the power dissipated in t jnn5*z6mh)q ,xwrv8xhe 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 v+4ntdc)c/m:u ki qh. 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 509- d 2ubk 1tckys)jpzqmhp2 . 4r)tz-i-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W;8 cspg06rvjq*lya 0 c resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of dc +q+ 1qz--qfpf+hdb 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 inductivepu rzyjk4ld9 8*/hiyml7dv dapf) (:/ reactance 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 reac-lj 0gc/w r6edpj9a:vm)ixm s)2s3 n ytance?

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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 reactahc (y +-ixqjt3 xuer4l0 i(ti)16vumonce 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 frequency7)2pk eo9efewk6f ze 7;lysx 8b-p;gn of 20 kHz is applied tfl28;wnb); xek esp -z op 6gey7kf7e9o it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coiltl4vo/x sk6 b) 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 co8c3q0c3 kwl of a 4.7-mF capacitor 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 W of capacitive re( r5 qwy 60o)*iq1zfvywbfs qeo kw)6.is k8d(actance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactz-nqn yi5 /ags1e6x beyjs3w1s;mw* 8 ance 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 c r1 couw(75gljapacitive reactance of a 0.010-mF capacitor be 100 Wg(w7o 1ruc5 lj?

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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 0.001 ,p9 h-fdq16l u7xqhus0-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, 15.0 W i,*fgl4lf w.wg nductive reactance, and 10.0 W capacitive rea.* f,wwlg4g flctance?

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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,se 1h7 xnamc2u6wdv/:jpec + coil, and 1.0-mF capacitor are connec:pm, /j6vn c u 1hae+ds7xw2ected 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 Hzh- yexyq9.i-83tm b qe-mz.qc if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri-.beq qym- zqmieh 8ctx.-9 y3es?

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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 con,na( dd+ty n ,dd us:dz/vsl.k;zw,j3nected in series with a 20-mH inductor, what is the impedance at 1000 Hzd,zuk,ddsd(+d./:s vz; ,3 jn lyawnt ?

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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 inductornq(3n io k14so 2w;stj, what is the phase angle j;2o onsntkq 31(i4w sat 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 in a series circuit with a 20-mH coil a9nj9v n wd0mt4nd 1.0-mF capacitor for a total impedance of 10mnw4 jvd99 nt00 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 1aq,:twl0pl6f ub+ 8sh00-W resistor and 15-mH coil to get a total impedance of 110 8, l:p6u 0saqtfb +lwhW at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at f xp4ny wfmwd03qd0 ,-cyk(3 /tcq-mr 5000 Hz for a total impedanc-qn4(ywwdf,3x d- 3 ry mmf pcc/00kqte 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 resim md,+99z3ov pqknk)estor at 1.0-MHz for a total impedan3mpzo9,mq) 9d k+knevce 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 capaaz j3c .9f,)kfx.xuf ecitor. What is the impedance at 10z fk.e ax.xufc,3f9 j)00 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 totaqxh h9,cj-q9ygv ss86 l imshjqxq8 s6 c vh9y-g9,pedance 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: d kdxu1pci1,d:, xkbq uq,iw;7zn8s with a 10-mF capacitor at 1.0 kHz for a phase angle ofd,d8inw,k;7dqxz: x1c u:iqkupb, s1 $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is n+lqh 6wx j,ar(eeded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45wj+x 6 ,ql(har 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 s9dz:b158a rk4;p okan hdb*g neries with a 100-mF capacitor at 120 Hz. What is the pha4brz89: ngk15ndhpad ko; ba*se 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 anylbn-+k z4ig(ed. p;ld 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacii;(zk dpe.-yn 4+g llbtor 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 resistob9/ad 4 ,.ht(6grujr ng ql g),iunn-l w25ecir, a 10.0-mF capacitor, and a 0.350-H inductor. The, r q.n9gluh, w i2cen arudgl)t6g-5b4jn i(/ 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 capacitor of capacitive rwazlt -7zc/) 9bodm5 +sf 7ofceactance 30 W, and an inductor of 9 oolfbsmat-+7f7 / z)cz5dcw inductive reactance 30 W are connected 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 circ5 qh0t2k6vhp79 lrsze uit containing a 50-W resistor, a 10-mF capacslhk67 2e z5vtqhp09 ritor, 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 resistor for a phase angle . *siohw96)igluudzopz7 t*r*e fq:9 ofeti7l hfdz6:o*wi9gzo9uq * *u.spr) $40^{\circ}$ 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 :dzuhj 0q-*w zegs,-a has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum h0 juza e-,*zwqs :-dgpower 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 with0: 5bt jto f*koeol8.e1bwhow+ hkx(- 12.0 W resistance, 15.0 W inductivk0ot*h wfj+ l8(k: o ehb1wobo- e.5txe reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC9g8oigdsie .w5t g k;) 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 resistmfaw7*q+y4cpkz k ho0n*eq xq6 ,m17tance of 30 W. What is the power fax+7wheczp 0kf6y1k7qaqq ,tnmm4 o ** ctor?

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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 resis .w9ywv1 *n sadtqe03ztor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powez v.q yew0ta3ws*n9 1dr 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 fros -,eidqx10nke/ymkm o32f )copt.(equency of a 1.0-mF capacitor and a 15-mH coil in series?mey cki .0k)s2oopme /x t,(3-d1fnqo

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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 selulrwtf6omm -q mu:8n9xk43* 3-a wpyries with a 4.7-mF capacitor for a resonant frequency of 10 kHzou-fumq9lk*wy- 8xml 6n 4pa3w:rtm3?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needer 4kq/pqaqh4 px33n z5d in series with a 3.7-mH inductor for a resonant frequency of 1000 Hn4 rpq4x33aq k /5qzphz?

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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 bemp:,uxcx c )k2jtngv d1sgwy5:x(5 9x placed in series with a 30-W resistor and a 40-mH coil if thexsp,d:wv:j) 9 2y k551 xcucxgg(mtnx resonant frequency of the circuit is to be 1000 Hz?

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