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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 y7mwh 6jvcp;3bgt ;ddn xh7 cn.9* *olexcept

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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 inductionsv:xng9; x 4lk m 5wvj+d4ahdan( u;y8 states 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 produces what k rjtoz9(a+1j wind of change on the (z9+ watrojj1 induced $emf$, 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 strengthvo6qexzpkl + vz 57+:y of the magnetic field through a loop of wire produces what kind of change onk ovv+5epy7:6z+q zlx 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 c dkpy.0kfki25hange on the induced pf5 ykk0dik2. $emf$, 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 j36anw6*+(.9kqq m /y lxj vq-epnixsmagnetic 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 ayybl , u;k8 ggoj5w jd 0v;-e/qq69/kjg o;xein induced current in a conductor will be that which tends to produce which of the following efxo5;wvg/9jy 6 ike 0k go 8j;beqd,;l gujy-q/fects?

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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 abov+ gyxux7jb0v pr7g)t.e its center with its north p. xpxg7r7ujg tby0v )+ole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a ho*:njbxnp pl5r2 or :f0rizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fallinj*nro 5l:0pfpn2 xb:rg 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 the magnetiua ybgc-1s+x ykp:.y5c field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducedy :.uxya5 k-s ypc+gb1 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 n,s *f3:th- pqzl3a njfield vector points straight up. The magnetic field suddenly-phnj*t:lqfs az ,3 n3 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 magnetic field ,)saak0+(t a zextg84h nm/dl/a cjr8points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in thisx+s0g 8c 4 ,n/etkaj)zaad( h8/rmlat 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 ever-incr/-8wbc)b olg tpe h39reasing current northward. Two coils of wire lie flat on the table, one on either twh )c eb l3p89r/bg-oside of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enteri caed-,s; nf;lg3ukmuz 4xn7 0ng first. As the north pole enters the wire, the induced current will be (as viewed from abov0e3 sa, 7fcu xd4l;mk ug-nzn;e)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axs 5tq u m-li7c3jtcidg 079nc+is whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loo0i d c mq5clnc-9j37tstgi +u7p'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 3khi o9tas;) gqe*a2m is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fha3oa 2se*mi9qtkg );ield points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.,nf/5nv3 pigu vlw1k .
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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 t3ii:(mfed4tt5ggk . lbck a: 4hat 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 4 3dm)s k7wzhc:f+mo-az vt(h magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) 9g 40rgqy+v3r zieamdc;c2+ wis moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential 9m+rd+gwzg4ayvqcir23 0;ec 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 rof1 )kqbw 7g5lop)rgj6tates 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 generatordw.b c9c-.npc (dxu77r8anc:j6b xx w 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 4ip6-o xevq1 grevolutions each second. The frequency of thev6 oie4x 1p-qg $emf$ 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 uf)/e8v xnj-mr 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 o4-6*etplxs ht:o-kj /2bo fp 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 contawm:yo(i t6vzk+b2f;tfb/ 9 x uins more loops than the primary coil theitfyb w 6+/zt;bmoku9 :vfx( 2n 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 coxfxr +n4ffr3rz,0 xa *il contains more loops than the secondary coil the4n3a0r*r fxxf+xf z,r n 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 pofehfh s9om; 94) ,mprwwer 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 circ4,1p+g wpcq lh(wyzpbeep 0.+ uit,

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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 indbb2) g1,l fdkuk 46yg z58xuoyuctor are connected in series to an ideal battery of constant terminal voltage. At the mom ubflx5u,k gdyozk) 16gb24y8ent contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battkatcnz d66 74tery of constant terminal voltage. At the moment contact is made witk 6ztt4c nad67h 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 pjr/,)1+hfkyl9qdc h a)yg jycq+ ; .nwith 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 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 w9a c2re;nlm z:ith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batter bgb/o2olz6)lk;,e uj y. The time constantlg,z je6ulo/b) 2;bok for 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 are connected in series to a battery. They3 jyak55f9 t g/e r*rwe6gb*q battery is suddenly removed from the circu qy96gy3r*g* a 5 r/jeefwkbt5it. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unxm7nkpc2t9ya9, frh,g2s 6tw its except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circui y km9.y.b+vnzq *a(jtt, 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 peby/qv2b 4c3 zower supply. In this circuit, the curren2/qebb vzcy43 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor whgsr )8guy) zph-hhzz f3 4:0kyen the frequency is 4y-)ghur0gp f 8hkzs z:3h )zytripled?

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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 doublo q ewv o6i17)7txc)9sag(ln6 3mzcyoed, the inductive reaco)ms7awc 7te6)cv1oqgyloz n(9i x 36tance 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 zero8,ch e1xombn qxf, e l+2*3jte, the inductive reactance of+q2obh8t,njexx * f13, mc ele 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. Iy l4k*r;jaiq: n this circuit, the currenlk4:jq ir ya;*t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor pmt3s)dsuw 2a11p9k seonvop .6a*5 f* zunu4 when the frequency isa 1u53p*pw sd* ka4ptz1n2m)un.f uosoe96vs 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 capac9 wl 3 9uox+4fg uvc,,(wfqotsitor approaches zero, the capacitive reactflq w+,(939vw,c4o fsug uoxtance 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 0ea pv2n1)iv vom / 9lvqujf6v0k:y;zinductor and capacitor in a vpf)k / :zva1 movnlyvv6;e2uqj090 iRLC 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 hxl 7. 017xf, b 5z ajwgqn;pokjp4cm0circuit 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. 6/mhv8/ bnj k(5mxoefq6a fcv7+mu:o The impedance of the circuit increases if R increases. When is this statement truen mm/:(xev vbq7+8/5auo jk6fmfco6h ?

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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 :();4srin2 +xjsofu ivr3g uh 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 oj+iz reh gz 377vn(x+(n90i8g dxq ydzf 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 series circuit, the1da tkmv dsc90( 0ypw. resonant frequency of tct1 .avkdd90sp( ym0what 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 t8 ,e m+eh/e2mzers mvoe-f4)khat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circhnb rws0d/ hyv. tk)7w6cxz25uit 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 uqq/vm7m et1 fd,u4q8rotating in a uniform magnetic field of 0.20 T. Find the ma,m7t8fqe m/4vuudqq 1gnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rot9s rj7nuj0e5qb e2b eq5q6qd*ating in a uniform magnetic field of 0.20 T.njr edbqqs e9 j5* 5e0b6qu27q 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 i*q3ucpiy 1gn v4u95 q/kq2isi s rotating in a uniform magnetic field of 0.20 T. Find the magii 5*qsq uu4213n y/ipckq9gvnetic 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 arecy/tln .t 9h4ra of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes nc/o* 3euto/2/ pwkag .4qpwdm;z d2tfrom $4.0 \times 10^{-5} \; Wb$ 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 square frame with sides 18 cm a8:tqbd3yaw1. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fielwty:a3daqb1 8d 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 turns and an(f2sr gh/9i1q begxp0 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 ar5 -3o top4imks0b;m waqq.g .oea $0.20 \; m^{2}$ 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 hf nq/gzxg.8-f +c- unsorizontally at a location where the downward compsng8fn /cu -+.g-qzfxonent 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 a39xnk8ic(ul ek2 ft. that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a con.a9 le3 8ixnfuc2tk( kstant 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 and a cross-sectional arear; 7mmn*mksr 8l)dmv0 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 obi67jxzfkm1*2-resi7k1 cp rf 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 lol3q:wq t0 ,uoaop 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 iu l,awoq q0:3tn 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 consi +bbx- o:nhhj+sts 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 geneqh i.p,suyyt x)rv4 53rator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0 r34 vy),h5i.sputx qy.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with riy bx3jwq;;m p06 in7a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.h 303gw4b1(5/ dy pskbqxmkr r 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 operates i42sbcyjqk0jw rw ++i ,rsa3llm*o2w s6u;*z on 120 V AC, and when running at full *zcbwqsj;6,4syiasw3ru +2 2llkj+oi w*0r m 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 (tv0 fji7l jcfpri768jk53jysupply. The operating currentf5 vlkrp8 tj7j f6ci7y 3(i0jj is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanc3-dv(ox j . tksx pnr(8bd,*eye 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wh(83 ts.bx-n*xedyjkp , vodr(at is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to7kr(,8lku2(hwy zwn z a 24-V power supply. The operating current is 1.0 A at full speed. (,zwy8(k7lurw2 znkh 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 neededa-fbmo/ v gktynw yb mr5mc/. 5tk;4*9 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-turf, ;;1 cspnxenl)ewwmg:ra /.n primary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondwxwn.n:;;g ea)m,er fp/c1ls ary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V sewuqr05zlb a+3condary has 100 tuqb5wr+zlua3 0rns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of6gyplshj1 b)1u xsx2* ,4 b wkanjft-4 a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary isbjk6*xxb1 n, h2su4 j)gf4yal1-pwts 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efkh08txw7c-1c2 pmfno ficiency, how many amps at 24 V can flow in the secondfwpcx10o - k h2tn87cmary?

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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 transl- -gme5w ees,rfl(,yp /v 2lcformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. s-5 ,g(/lp ,wmvlefy e2r-l ec What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 30ulfgbg-sz; 9/0 turns on its secondary coil. Iffs 9-;b gzlug/ 120 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 has 60 turns on its primary coil and 300 sq/yy7: c80no- azvmp.oot k-turns on its secondary coil. If 120 V at 2.0 Avo-m y: .s/qopk a0t-7c 8ynzo 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 h/zxpzq6uk6 n gek*u75as 200 turns. If the input current at the primary is 100 A, we can expect the output curxpe7u 5un gz6k *z6/qkrent 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 tra llxp6h8fpvnofi1a nabw;8 2 /k6b0c1nsformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpu f kp6hn1xbi6p8fb1l na8/vl2 w0 ca;ot 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 seconf+ bep)5 ai(7 su0krtgdary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of thebtfr+)i0k57us g ap(e 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 /87 aac- *jclutvi (qczha34 hV. The voltage is usually stepped up to 4500 V by a transformer and trans-/(8cvaaczqtj a 3ihch*u 74l mitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage: fpi 9h.civezs, q*6j is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistanceivfep6:q,* c.s zh ji9 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 usually ge)w(iw3l6m rstepped up to 45(rg6l )wm w3ie00 V by a transformer and transmitted through 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 resistance of 0.60 W. A gene8ny vwk+yw0- srator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission livn0- +kw8s wyyne, 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 u zauz)g6h)huex ;bpym.08m 250 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 when the transforxheybzp az 0.uhg;umu 6)m 82)mer 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 lbw4 5bi0. dnljost if the power were trand j4l05iw n.bbsmitted 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. f)(xl m m a5j4segttau;ga..8It 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 not totagtgx4.8uam a.jem)fsl ; 5( 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.+5ae j cd0-ai; 2xv gz7/dgvo9x +yedg0 A. How much energy is stored in the coil' ixze/vdajeg9 7dgc;ogy0d-x+a2+v5s 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 an 18-H inductor. What is th, 5pbs33icvbj is circuit's time constantb 35v,3bcip sj?

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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 circuits.sepm y;ye- :w98nlp where 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 placed into a 120-V AC 9wu2f+6 re:nrr;xc0 d vy wqms,t o.w5outlet. 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 resistanceow+ iew- ,nphvt40ec f:+ d5ei of the lahn0e5e c: f+i-pwoew+div t4,mp?

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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.7 j .a0,hde/mu)u8g9im aqv;nv ,igc y What is the peak current through the resistaceggj h/u ny 8i vm7iq.v9;ua0),,mdor?

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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-rjc0 b:dnuc::krs37v vm:jm3V ac power supply. What is the power dissipated in the resiston:3m d3 :v:sjcbcu7k0rmr j:vr?

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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-tlk3 yi*c 3q8otza9 y 50-W resistor 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 wow4c *rnex0e9fe(y. w:q.bj 50-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 .gi r7za9jbq m-;q6ibt)n 1i ma 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hz?l, z2u/0d(vko,z-bc /afg q bh

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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 2.5h)(*rx mods5 e0-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;4hcu hcd, cb l--:zh lfpx7m; W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reap-4d/(j ca0l40:fch g/oivape*yzrd ctance 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 frequencj/ 437a srxlcvy of 20 kHz is app j73slvxcar/ 4lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2rp4jyqjhsud7xrv6 /:tv 8 ,b..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 capacit wt6kj13 du e2l(uodtln 2hk*,6tz0onor 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 Wpvbx::l9o50sjd w g5ise.t8 ; h gch;p;zkgb0 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 doet;8pqhkmce ;: s a 10-mF capacitor 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 t.)hmm2wt y*gxj, +ujp6zi *s reactance of a 0.010-mF capacitor be 100 Ws,2*j+*jpgzmhutt6 y wx )i.m?

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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 H-(x8m1whcuq xy r4s.l z 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 wixh2p awko/w )q3 0bl1lth 12.0 W resistance, 15.0 W inductive reactance a0p)wb q2o1xwlkhl3/, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedanc)8av/ 8fypdj)c, ns mre at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i8psvn rymac ,)d fj)/8n series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-.kkjvpz6 kv6e75*j5 3rq u0wr ayqf;wmF capacitor are con 3rfz*7 jq6k5wvk6 50ukwy.e vja;pqrnected 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 /tcv n x1l+74x/ s:l fpw(wsjjconnected in series with a 20-mH inductor, what is the impedance pslx/n/+vlw7jc wj:s14f(xt 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)wopj0 *r x:o gkjsx19 connected in series with a 20-mH inductor, what is the phase angle a)rwk0 9gos xx:jj o*1pt 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 annw kxqv5jw2 8h+a8bidmq 89e9 czb,8 qd 1.0-mF capacito vq8nq8b99mb, z xhj88wdkiqea 5w+2 cr 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 xtjr ;kgz+8 f(zf( q2wcapacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2 g;ktzr2fjz8w+ xf(q(000 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 mil12cg:+6bpom8 mi dc 7dnn:450-mH inductor at 5000 Hz for a total impedance ofm+ic8cdnp1l2dn :6: m7 bgoim 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 z. u )t8ryj9.qd(o zrmseries with a 100-kW resistor at 1.0-MHz for a total impedance of 150 y)d(oq mrzt. 98z.urjkW?

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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 71eeaab3. +e nir q61. jzcwcpop wm.;capacitor. What is the impedance at 1000 Hz qewa 1ozej.pbe.i;m+a1p736r.w cc n?

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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 wtwjne65 x fy6j) ro1,dan+vd*ith a 10-mF capacitor at 1.0 kHz for a total impedance of nf6 )d ojewan y6jxvdr1+*,5t45 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 neededh cut4bilb p 0dwd-g8sl9b8;svj y 915 in series with a 10-mF capacitor at 1.0 kHz for a phase angle ofw blb ;49ud8s0hdjpcg i59 l1v-ybts 8 $40^{\circ}$?

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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 dj:e3:7y jw,zd;ws.zhoi5x o eeded in series with a 30-W resistor at 1.0 kHz for a total impes.zi ;o3 :7d xe,odwy jj:w5hzdance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF zj3(v :u hlurimj:+y3capacitor at 120 Hz. What is the phase z jrj3::my( v hl+u3uiangle?

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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-mHyx)alvirox d 0c*2a 8o7s.73ustc lk 3 coil, and 1.0-mF capacitor arevyk2rc7xt)3l. a* i7 3 sx uoosl8d0ac 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 resist++8p b 3t1utcnwb7txp or, a 10.0-mF capacitor, and a 0.350-H inducxputpb++tc1n7 3 8bwttor. 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,o3p n2 sisd5*w /y kewsh;c.g:)ltsi,t /sr o6 a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What c es dcilnwr: t;is/s ys,gh32sp/6oot*.w5)k urrent 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 circuit containing a 50-W res 7cv cqqiq)j,.istor, a 10-mF capacitor, and a 0.45-H inductor, wheq.icvj, )7qcqn 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 seriwxcu3;ae6t v .es with a 500-W resistor for a phase angle o; c 6t.xaweu3vf $40^{\circ}$ 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 = oy55dqb7dv .rsd*qbh6 p(p at um 2i9:20.0 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 driving sourc vyq.i9p*btq 5a( m 7urdd :2pobd65hse?

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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 ) w:q8do6iyxran ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit q6r)yi:o dwx8 is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circ 6b )htx8uhw)euit 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 / ducvz,yrm0noyi35* a resistance of 30 W. What is ,*5i 3/0dv coznyyrumthe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circucd6s9sy8n.2m :q bc tsit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl6m8 dnst9y cs2qbsc.: y?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seriesvzp/hz;x1 anwefsr6 w*)z5m .?;r )zn z51fv*.6sw a/mzhewxp

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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 uya 7 ip3,a/gifor a resonant frequency o/ ua g,37yiipaf 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mihq(z/w:xme1v m9 d 1xd* bd/nH inductor for a resonant frequency of mdw:*m/ / 1xvz1edqb h9xid(n 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be pv-1jd,wu ea a,laced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz- dju1 aw,e,av?

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