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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: 游客未登录  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.s6zh qs+8w6xp qce9k except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thaqa j)as17q/c rt 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 lodtmjc8 iifwvi+. k0- 3ops of wire in a coil produces what kind of change on thec.i vmkf w03d8ii+-tj 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 strength of the magnetterl.izf)9 6 tic field through a loop of wire produces what kind of change 9.f6tiltz e)r on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces wha tw8 oodewgb6 3b3pev, bjg+h/bu* q 2q(*cig7t kind of change on the induced*qi2tg vw h/ 7ggjw eocpqb(b*b3 b3o,d6e+8u $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field 3gfryd: 7 :)xu dfm2cdan $emf$ 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 ooakaa-paf, 7y6j1 v;tf an induced current in a conductor will be that which tends to proa1-;,a7a pfv6a jo kytduce 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 barp :bgp;ucv5*i v(avh9 magnet is held above its center with its north pole pointing down. The ;: vvcv5hpa i9*(u pbgstationary 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 ) ju3- r2k7a 6mawmin99ptmizmagnet is held above its center with its north pole 97rw2-ij6 mi3ptka a 9 )nmumzpointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the maq-xsp6 r pk /cs8v05.av*bobwgnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensabc0 5xvv/ -r6*8bpqss.op kwe 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 fielw8so .akbt* (5sj3.lfdhx /xo d vector points sl*8(s3 k jhsfoxa/.5od.tx wbtraight up. The magnetic 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 hoswf ;o+u8y v.brizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of theo .wsu;+yfv8b 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 ugimn. zg(d:vd9+ij4 on a horizontal table and carries an ever-increasing current northward. dvd9n 4z+guigi :jm(. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. m;4.r3a0ucnzczwe bpz7( sn2wt j2-b As the north pole enters the wire,m.nsbrjnc7;w t2 cpu-4b3wz0z(a2 ze the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatey9l6v6 h hkws9d at constant angular speed about an axis whose direction can be 69yl6hsh9 vwk 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 consu.x w+4p82*ztd*p usde4od y9 eauks b :b)qo1tant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of tb4e 9* e)du d zp8p21u.tqxy* +uboo:ds4akswhe 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.ewl*cq9b0d b/fjf+j ;
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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 ty 8-cyc: fbf.ghat 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 ma;b 29kyohl 5vfgnetic 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 ecc 4(7tru y9;8 ky)wm tve,oerast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the 9 ,4u)7c;yvr wt8k rcto(ee myrod.

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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 constantzkp9-dg*kquye, * xw k2jk17c 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 transformsy x9lwcww8( z4+4efdl

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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 frequc4j / c.stpj3lency of thl/j j3scp.ct 4e $emf$ 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 to 032qfhnybeg49qa g:bit m-k6

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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 devi 2w l92 -gsfx+zhv3whvce 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 conth-8m3) odnnda ains more loops than the primary coil then it isadn h8-omd) n3 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 sw0v aa/-7pkocoil contains more loops than the secondary coil then it is o0v/ka7-a swp a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power 3pgqmmb2ul7vdl51+ k 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 j5a6aj 20g .5w+vue6r bov jaosl6oy*circuit,

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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 l) 62whegbzz,in series to an ideal battery of constant terminal voltage. Awez)2bg,z hl6 t the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batterd8 jxcv(s14 .z0dj bkoy of constant terminal voltage. At the moment contact is m1jbd0.ocsdv(j84 k zxade 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 connec1uj /nacdy (q9v1ogw(ted 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 w7z+ u28ojdqckv;(s3ctwx ) z yith 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 serb8 me/zn :3cpfies to a battery. The time constant for the circuit represents the tnf3bm: /cp8z eime 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. The batz/u.q5ytjdm-dgpy*d ou8; nz (g* fci ( eat0,tery is suddenly removed from the circuit. ( 8cdy putz./y5qj-0 ;zeggmftdn(*iao* du,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 unitb.py /*zlt/ka 8s9t :8gamtlus except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cuhu:z4cn8ic :dbpzd/ 9q7/y gc rrent

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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 z8mv7q mn8h hoe7 sb;h2-(aassupply. In this circuit, the currenvmb 7smhzso2 7 8aqae;h h-n8(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 when the18/mf.mzl hd o-z (bncn7i:wglur )d- frequency is)h/. ul f17 b8l-:(rwm n mniz-odgcdz tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, +.g9 fzu8s dpty 9b hfyl,5jck/b;a l)the inductive reactan/, db yflucty;s89.)bfgz+h pk9lj a5ce 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 inda vcdse bas0p5h0: 6c2uctive reactance of that c0shc2dpv0:ebas ca5 6oil

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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 supplaweb/7hue ql nue1 9fwh65 g5/y. In this circuit, the currenthe1 9wfehw q5ub g 6/5le/nau7

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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 wh;7apse a+ q e4- ahcap0t162etoqff0cen the frequency ish1tspfat0cpq6 ea 02+c eaoef4;q-a7 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,jc+ b.vvcgn8 voltage across a capacitor approaches zero, the capacitive reactance vjc+8gnc.v b, 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 betwe*-64hwarfw:r epr v;ren the voltages of the inductor and capacitor in a RLC series circuir:w a-h pfr*w ;6rvr4et?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined agczr, -0)tah-bj8dv ms $\cos M = R/Z$, 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 i8o )z)beb2 mslagd+6dncreases. When is this sed)b6 mz8ba gds2+ol)tatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit in86+qahe xwm :tcreases 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 circx6y, hl05disluit 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 dovvk9+d7ok y g8l3.u jsids)v 8uble in an LRC series circuit, the resonant fyg3+dv7 98vksu.8ovl) s dkijrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied vok h hj*bulr3vxs2v5-(ltage. 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 occurs w4t5vw3ppj24gr) u ci 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 ey-n.lv1g m0)vd*ec rm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux gle.y)-c vd 1re*vnm 0through 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 rotating in a uniform magnetic fie9d)odrv0)t hj m.as8kld of 0.20 T. Find the magnetic fl9ts)8hdoj)d0vk arm. ux 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 zl:vm*+e-esy rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vect -yzl:e*+mse vor 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 okwrt t2cztmrf,eoe310 e.q1 s/s /ac(f 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 ;xip*-o atq y4changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. 9/gh7bib6e5hbgp s -wA unifbh-ip ge5 7 69/gbswbhorm magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average 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 15j7s13mggb6ufff )mats c,6 ) y 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 ,q hzwe6woj3i8d 2o0ojwz,u:gmuty v b .4:8 kand 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 6 ob 7vy(+h5w)m/bynqn0 m flies horizontally at a location where the downward7vmyyhb q)(b5ow nn/+ component 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 angular v-,cu9 fnvi*d94xx4e7 tlrj qselocity of 2.0 rad/s about a vertical axis through one of it f,*ixvd ur9e j 44-cnt97qlxss 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 and a cross-sectional asa1(qit:x0s6p/pz ) g rz7j jurea 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 o i8weh6toj)3uez.6fr f 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 loops ovse9ks f(si 0e,wu..b n 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 voltage of this generatos. s0bws 9ee,f u.i(kvr?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 1 /r546 cbusw4xj6kg nd00 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 okt j)r,y ksx+5f 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of thrt5+ )kyx jks,e 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 gen49 iyke3cfp:jc 9 uc 5bm-(ggqerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC ))jz.61 hmv ne povao;u7(jzumotor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a res m7g/h, 5rzdoeistance of 6.00 W. The motor operates on 120 V AC, and when running atme rhoz5/7gd , full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. qhb6g09jxm: v Them9x:v 6qb0hg j operating current 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 resistance nmrd4gvh1;hf y )w((.pid e 2d6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spee .dhepgm;nh)1(d4(vi dy fwr2d. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Thfdh xog xcva+ 5/46y3j.s *jsoe operao3.5c ojgyhds*v/ j6a fsx+4xting 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 reduce a u4 fm0 /rc8:r vad8rfq/bvc8y lnz --nprimary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flo ,gy3pa:qw+qow in the secondary. How many turns are:aoyp q,+wq3 g 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 3ui27ec1cgkr fou 8n.turns are necessary in a 110-V primary if the 24-V se.kn u1io2fgru e c7c38condary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-tu85zh tedrvfs-3ob. 9l rn primary coil and a 2000-turn secondary coil. If the cur9hsef bv o -3tdl8z5.rrent in the secondary is 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 u 5;f-dgq useb8 p;tro8il011zr wt*otransformer. Assuming 100% efficiency,10ot-fr1p ;szt do88*5;e u lqgb wrui how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a 8o9sv af;5ca m( tzb(s/8jcnb neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prim;8v(oa c fj8(9mtcs/bn a zsb5ary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tu n32f(kf bld+tys t80vrns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in b s+f d80ly(ttvn32fk 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 haavtem 77zw9rn. v, q+as 60 turns on its primary coil and 300 turns on its secondary coil. If 1277zqav tne aw+.9m,vr 0 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 8 tlhs)p1k*onand its secondary has 200 turns. If the input current at the primary is 100 A, we can expkshp*t n)lo81 ect 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 seconda75 onlmhuzwv 9agc; yf.2)p 6nry has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the 7n6)c2lp uzogv 5;mywf.h an9secondary 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 hasp5sbq0t- y)ext9cz; s 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expe;s xqp9 z0)-y ctbte5sct 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 stepped :h1fibo2 wc +-s9luiiup to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fbiw1+o9h2-s cifl :iu ind 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 v4d+3gko x5kb3aqb4qfkpis/ ml5ps, 9oltage is usually stepped up to 4500 V by a transformer and transmitted thskpqxs,iokmd3gbl/f p95 a 5+34 k4qbrough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of if3 zfh,o+swj) ht bw/1t vx;8current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a13;fxvhotb)tw,z8 jfs / +iwh 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 lon wea8s k49jv7c,kp s(ug has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy losuvakc 8,4p7 e(9s skjws 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 would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a tot.i/v ym lb*nw)al resistance of 0.60 W. A generator produces 100 Vvi/wylnb.* )m 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 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 wn; ur(3if0nec8x p4mless power would be lost if the power were transmitted at 3000 V instead of wmueinx4;rc8n( f0 p3at 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 transm3ji0/nyd gug ,itted 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 g30nj y,u/idg 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 currsg c1, ,mem1rgent of 5.0 A. How much energy is stored in the coil's magnetic fiel m1 gscrm1ge,,d?

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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 181ai ww9 utry22,iddv0 -H inductor. What is this circuit's timwai vw29iu y0r td,21de 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 volta0x +xo89s kxexge in an AC circuit 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 outleteq5mum0 *tp4 p. 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 outlena0g1x9fc j* qo,l p. ks3w+yct. What is the resistance of the lamg9.x1s lcnjf y3w,k c0ap* +qop?

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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 t/otlad1.2h7pvr4 do41 vdbrf o a 120-V ac power supply. What is the peak currerfvard7v1 4od./ tpbo lh241dnt through the 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 12n (:asnxqyu0p: 2t nu;0-V ac power supply. What is the power dissipated in the resi(a:ntx2ns :p;uq y0 nustor?

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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 renvw s)ez)lfe ejw0- ,-sistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto5mysj5)g ebuzh+: 8k 36fuqny r 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 resistor ;rs uvqsj32sx3ai; 7r 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 1.0c81ermu51dmcvgf 1 p( ba)jq: -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 reacty8t 5( fdui5umj*n)gyance 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/klk) brft nx u+9*i9b coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hz; )ap u-chw-dkrt 3v-j(oe:qi?

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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 frequency of 20 kHz is*8 cec), pgusu ucct(, appl)c,p8cs,c(g tuc ueu*ied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-xl.bcj,yitbo 11b sih,6;8u vV, 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 r6z,xq cku3nh :qik/y-f2l 9wreactance 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 50t 12(ltsumcpu 04lun *-d n/uj W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactanj 7jq)li* bebs u2s23 vl7/v0e c3ucvr, s;rhdce 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 wil ;d8cvhk bpg;2l the capacitive reactance of a 0.010-mF capacitor be 100 Wbp2gh 8v; kdc;?

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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 cah3utwg)e fs 5/pacitor 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 tg 92h 61rucjuW resistance, 15.0 W inductive reacthutug216r c j9ance, 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 impedance at 1500 Hzrw .el n;v3+5k9 oudfx if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri5k.+o v n 9uwfexd;lr3es?

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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-mF cx9( k/fhmdvvqr.v;w56 sdc lb5 i 9g.rapacitor are connected in se svi;5w .bvqr.(9 x/cfvm5lhd kr6d g9ries?

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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 in f 9na(te*x.rlductor, what is the impedance at 1000 Hfl(e 9* a.txnrz?

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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-m gay plpbt09f:,akdvv 72q+g2H inductor, what is the phase angle at 10pfk+ 2:a q,vg9l yt0agd2b7pv00 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 coik- uwcnw5ds)pymcgmu-1 w5 *- l and 1.0-mF capacitor for a total impedance of 100 Wwk-)ngm dcpu-5-5w *myc 1wu s 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 capacit 3/irccno;ov*ances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 rc* o; i3v/ocnW 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 5000 Hz for a tov d 1fju6q7rbnp*gu, 7tal,d76f7u1u q *rgjvnp b impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series wi h+u-yk mn7t3oth a 100-kW resistor at 1.0-MHz for a total -7 + myntkou3himpedance 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. What01 - akfjtsom5 is the impeda-5atfm0 j 1skonce 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 inu nmy5t3w oiyd +7roh)6ap; 81ktuq8 e series with a 10-mF capacitor at 1.0 kHz for a total impedance of ;ka +t8 qd r7t pywu6ym)o83 u5nho1ei45 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 witvnl dyf,t.g*)a(g*9srknz mv se k2o7i (+ ,zjh a 10-mF capacitor at 1.0 kHz for a phase angm* f7dn ksze+ i)2. vzn(j,9 *aolg,(skvrtgyle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1tzadpui hl4 l9x-;t* *.0 kHz for a totalzx9 u*-ail;dp *l4tht impedance 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 ;z5q8) fn2 w fryss95dzj-v uqcapacitor at 120 Hz. What is the phase sqfv5;8njf s y- uzzq259)rwdangle?

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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, ar jjrslkq04 vbbff 83k7d silu .t9,75nd 1.0-mF capacitor aret,r3 4bd5sjjuf9s 8 lbfi 0v7 kkq.l7r 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 x:,1d2jecboxz/ h 5inof a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power s 2,o1/h cn5bdj izxe:xupply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 z1wel uw-)r4o W, and an inductor of inductive reactance 30 W ar4ruwoz-e 1w l)e 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 circuit containing a 50-W resistor, achgav;h *lk ,a)b wak/h.8mzkq , b0j5 10-mF capacitor, and a 0.45-H in)/agb.h5lh;a,0,kj kv qwcham *kb 8zductor, 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 resisp *cb+(h hc5d)1m ,r(e8d h kb:gtrbfjtor for a phase angle of h(dfb1 c:(b)e5 hgmph8k d* rt,cbjr+ $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At whc i.pf5jn z-b3at frequency should the circuit be driven in order to have maximum power c ji zb.np3f-5transferred 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 seriel,0jfv1r8, vbqcf r1 ms circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 11jcbr 0,lm8vrqvff,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 AC cibixvm/7l/y; 9ks xvx6rcuit 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 resistance of 30 W. Whjf cqp)uj 5.nk(8/v: qtxr l1vat is the power /j qvpju5x8(1vkf:ct .q) lrn 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 circ (5asla y :0 t.ll/xgv2b*lvihuit containing a 50-W resistor, a 10-mF capacitor, and a 0/ hitl.(b xv:l*a0vg yl s5la2.45-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 capaci 1p))k lpxuspu *y,cs2c8zn-h) es 1iktor and a 15-mH coil in series?)csk2k lhyis*upnpc1u8)p,z )se 1-x

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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 q/g1 /v xc3nayfrequency of v/qgac/1xy 3 n10 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-mH inductor forpr zs.tlm/1q /4g- ij8lcj xp5 a resonant frequencyil r8m.-s lc5gz14jt/ pqj px/ of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must 1ko.qlvrc vq+2;h6ljbe placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency o+ l;6q1 qrlc2k.hv vjof the circuit is to be 1000 Hz?

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