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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 following2),5nsnf)k g y3tlf ct are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that , (o(o9d4 nnvjfyiodx,m (yk +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 ingaua sa4;2d f- a coil produces what kind of change on the a-ada2gfsu4; 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 magnetic field through a loop of wire proopvxgn,0 yxps+/79 yqduces what kindpp7y n/qog+x vys90 ,x of change 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 it.z6b(m)o v lwhat kind of change on the inducedz . (m)6oiltbv $emf$, 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 frnss/d)cy0hgy q 8( 2hhom 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 direction of an induced current in a conducto(:axgzds ::xsntk vd k1z,)5an n/5 zzr will be that which tends to przdz / dnk: 5k()n:gxsa:5zv tan,s1xzoduce 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 taqpib8 s,m1 *og*jq vrz0*kar1 ble. A bar magnet is held above its center with its north po0k jr*,8*s pi 1 z1mrqbvg*qoale 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 horizontal table. A bar mage*us ib :oh*pe m4;)dmm6sul+net is held above its center with its north pole pointing down, and released. As it umh*+sm;le4 6um p*sd oie)b: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 hgi)ow*gcgd8 -n3 9s ain a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inda)iggsg d 8*-on 9h3cwuced 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 fieke 7b(/7 cjs2ucppk( dovh(0g ld vector points straight upd(ec uvg(op7 0/khc7jbsp(2k . 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 horizontal table top i61 le7-ohikzad:imv ,ze sp 3:n a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewisa-1,:37i:m zo dvzpeek h6led from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and ca su1i90yyw82w hboflwa g0hf,db+- / frries an ever-increasing current northward.0yl, 1hof0bys awhb 9/f2w8-fi dg+uw 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 nw *o9 qp2*7sl5 xvydeoorth pole entering first. As the north pole entl9y7 qx d*sv5ewp*2o oers the wire, 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 rotated at constant angul7553o6 6dyirjuz 2mz-rhml glar 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 the loop's axlh 256yi36omld 5zzrr7j -mguis 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 consta -naq u6ur6fok)fg+-b nt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what+f )u af-ron-6qug k6b 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.vmfzy0m ;7(h8hl2ys d
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that a.l 5 z8kb;*or l:orpzan $emf$ 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 magne4;wpff)ah e- otic 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 yiy1*z 8u 56j+vzlq*bax i zf9east-west direction) is moved northward at constant velocity through a z +y*fjaizli 8*qvzy xb5961umagnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular v;2 c0zb3suwc-lokd)i elocity $\omega$ 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 ts / :jmahe5;zmn t,h8hransforms

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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 60i-v+eho ywd0 *ge*4zew )4udu revolutions each second. The frequency of they04hdzevwe w- *4 g iu)udeo+* $emf$ 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 3hf3i9xw ctl(x*jr3 3xg)l ee used 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 that) 8frw8b tiqcy sw;(4 eb+rft6

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the pr;x47pew8d.3;+hjvw.fndu k fvpsbu5imary coil then it is avu. h+3pb fs;vw4 ;w.nd 8jpdu57f kxe

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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 contail3;g izyo l47.nyy *ezns more loops than the secondary coil then it is ;74nz3 yog ie*y.zl yla

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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 inpjn4*8gi uji) uut

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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 cwn7wovv: ./3zj4yipc ircuit,

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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 5o m4; n*qygy2ri,bdu connected in series to an ideal battery of constant terminal voltage. Ao*b yrin u4,qm gdy;52t 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 s2 9pbivxsy :;aeries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inx;2 yi9pavb:s ductor 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 inductann 87qn 1wj*vgmbt :/bwce 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 with inductance L and resistancephw2tmz;r-nf f * -b. el/b-qa 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 induc x(xn0/ki8abpq. . 7t((dt o frvz9ptrtor are connected in series to a battery. The time constant for the circuit represents the t./p9xqtdxn 8kzfa (0i (t(r. vptrb7oime 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 inducxyb1x, :z hr zgi-th:-ctctu-:ga 22m tor are connected in series to a battery. The battery is suddenly removed from the circuit. T2m2 tabi yu:g- z1: hhccx:gr,-z-t txhe 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 )q(qc31f s ayv;l6qmlthe same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. f 8bw96cigj*f On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connec)c3f 2w8gtnqnpqryqd(: ;m y0 ted to an AC power supply. In this circuit, the currencq: fn;qg w)yymd q32ptrn (80t

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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 wha6mj(kazwm79p t factor when the frequency (zkmaw76m9jp is 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, the inductivhs+k*7kb feb,o1(fo xe reactance1e7bhk(fo o, +k*bsx f 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 Aaz;8b.lv,:fcbslem9jx8el:) ( w v d bC voltage across an inductor approaches zero, the inductive reactancesdjl e b.) bl: ;xm8:8wzc,e vlva9(fb of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power suppb- lekxrc.l.+ly. In this circuit, the current + .e.klb-xrcl

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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 when the fol lf;in0 0t+crequency isi tllo 00n+cf; 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 voltzdka:ht ji03n 5 kg;5s-; zlqaage across a capacitor approaches zero, the capacitive g:tla5d5 q kn-z k;j3s; hzi0areactance 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 vo+ -xe9uv sww/wltages of the inductor and capacitor in a RLC ser wx /w9u+v-eswies 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 circct d9v6xi0 l0kuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit ic f5adsg; -u d7ma9h:zgld)j8ncreases if R increases. When is this stj-)5fah 7 zdddlsg gm;u:a8c 9atement 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 oxbuu)8:jc - juf the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The imp (ef:oeb9m)j 9n)tn7qvdli 8f edance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circu*1pv4u )xahn uit, the rhxp)4*ua 1 nvuesonant 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 applied voltage. At resonancegv3 gfy.7cq. e,

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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 w h ac 4hbqq1*6tvu::qjhen

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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 rotating in a uniform magnetic field of 0.20--qcbe(fm qjfcu0c70 T. Find the magnetic flux through the loop when the plane of the loop and the magne -cfm-7b(ccq0 j0 qfeutic 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 ib m/,t;5q mfxbegl5s jly84t3n a uniform magnetic field of 0.20 T. Find the magnetijmsyl g ;bt3,54qemlf 5x/tb 8c flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0oxkni0/i 0n/fqy1w6 nu) fdkx;0- z ip.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an ai0n f xx -f1ziqkniwo )y;/dn06u0/pkngle 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 areaz+l z2cryb1,sotbc +. 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 coi/ v b.inmsvilwcjh,.;81or0l l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wireb2h8kb4woxr;zl; 0 qpq/xlu; on a square frame with sides 18 cm. A uniform magnetic field i;lxw/q2;;ruxzl8op0 4 bkb hqs 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 wn5 x/tpp /0gw)urx9b 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns ( ;e;2 pzgvcw2 ikg6suand 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 f y7 g.zvky-x2elies horizontally at a location where the downward component of the Earth gv7- z.kye2yx'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 anghh0 zgwp vk 3d6)lw 9.ip6fax/ular velocity of 2.0 rad/s about a vertical axis k0 d.f whix)/wp a6zph6v3 lg9through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has qacpxt ;cey ,(9*revizg4- c- 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 turns of wire of wtxec/ -z ;k-62n i4i/iv0fg 0izp5zioqy,tbarea $0.090 \; m^{2}$ 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 or -/q ,ek:not54e r 2krvsec2ln 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. r:r/lknec2erqk,s 4t5o-ve 2 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 of 100 turns 8. adme)) ,etc:nk xzaof 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 sggtu)s6anb4p f,(;n +zp: wzpimple AC generator with an output of 12 V maximum when rotated at 66;t p,pau: z(+4sgznn)gfp wb0 Hz. A magnetic field of 0.050 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 gen.e re/zo xc o+t 0rvq0.88:1jz qqma lvr0ak8lerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor o5cncn q v83onw) rz3;pc8mep+perates 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 res0w77vc8 f ac7o*syn edistance of 6.00 W. The motor operates on 120 V AC, and when running at fu7 a08vesfydco7 wc n7*ll 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 connect- 03 bm( rcasb4pi5 fowt11qlged to a 24-V power supply. The operating current is 1.0 A. What is the b 3frg(wbo5p0t i a1s-lcmq14 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 6.0 W is( 94flwq 3p6cbd0 1ar w(0t7+a8 nqirie ffqlx connected to a 24-V power supply. The operating current is 1.0 (i(arqit+cabwf0r0wf9f4 6qx 1 qp lndl8 e73A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppln p;9 f;orf 7/o1+k.yy ziuwecy. The operating current is 1.0 zf o+/nu97yrk1;co. ief ;wypA 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 redr(eq)x vy.lh 9uce 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 to flow in the seco(b17q x v2y2i7 *s)cqyg byaq0npec,lndary. How many turns are i7c1*( cx ,ilgyevqy asy2pn)0b7q q2bn the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a+g kp*m+ 7 2v1ryrzcu29 cwoly1 5ctaa 110-V primary if the 24-V secondary 2v 1a lkaou7y1cgy+zcc5p9 rw rm2*t+has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondafob m;o g.5y.wry coil. If the current in the secondary is 3.0 A, what isf.g5o o;mywb. 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 prima ; p/ig;(tqv.r0v1qkif 1j hoiry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the qh.o;p q1 j (1fi/;ikrivt0v gsecondary?

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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 sigu04+9oora8 zsorc *zk n transformer provides 7500 V at 10.0 mA. The primary coil operates on+o0r c s8oro*4a9zzku 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 turnewm2bn*j (b4c 6jo)nps on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltj*2mbe nc onw6)p b4(jage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on it00yhydcis4+ c s secondary coil. If 120 V at 2.0 A is applied to the primary, wh0i0scy +4hycd at 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 transformero4p:83j1ejd b at /xog has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curoj4t3b/:a8dgp o 1xj erent 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 secondar+9v5 spo:;pyc:4s eim zt ;tzty has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the5tp9:4c+ ;sm;tzv yoes:zpi t 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 turns. a rlt g,w2cz53If the power input to the primary is 100 W, we can expect the poczal,r3 wg 25twer 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 uhrlmd ((3fir+p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the (rrdmihf+( l3number 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. l3h57df/ cm)sq r oox3The voltage is usually stepped up to 4500 V by a trahl ocqmx7 s)3r/fo35dnsformer and transmitted through 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 current atx0d;b sqv52 h/es*h) go 1j0wfw 0oqds 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost j ewh5dsq ;1do* g)xv/0s0bs qh 0f2woin 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 g 8/lom j 3(uarss z1c:t7cj,bgenerator 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:gtc 7: asz8ujo13rcj bl/,(ms1. 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 ho optqcu/.4lpx si o(31v/qy) as 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 vytc lo)p1.4q / xvq i3so(pou/oltage 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 legt 25)omrh*gs+ ,x. jp ba*qhjss power would be lost if the power were transmiq a)h j,tm*h+ sgrp*o5g.b2x jtted 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 2 t(-eu*j5qhogftj77fde2 y)y0 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a o 7(qj )fytjy fh5gdte e2*-u7transformer if the 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 (qu zj v0ymxa93f, e.yu4zs3 sa current of 5.0 A. How much energy is stored in the coil'ss,.xm93 (qzsu z3jyv04a eyfu 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 ind7iurqr lr4f *j2k8d. tuctor. What is this circuit's rqri 84u7kjf*r2t. dl 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 buo 0rs8, u9decircuit 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 a7d((o y(l+tgmlf ylp*9hu4tinto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the c1)f5gq ;5 tlnqas9ibum )bz ,la9 aqzib lf1)5 ,bmt)sun;gq5c 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. What is the peak curr.xu-h s;n)svrent througuvx.-sr) shn;h 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 120-V ac power supply. Whatxrcm 8biqt 5jtl oyps7::24s u-(pfg7 is the power dissj5tpo7:l b: x4 ciu8mstg7fpy2r-q(sipated in the 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 resis7cyyb6au nt1 /tor 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 5k o s.5ro25wmn)6 ufmsn/t (e-dhtrs/0-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 re3om mp/ex*n9e u kl8q(c3o; j+2s *xwpq vfw8tsistor 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 nz;q cemh5gb93 /xm 4r1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 6x)y 17miw2jhz9 m7 aoz1j 9ruigf(ohHz?

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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 ha1tz+:m1s1 fy9we s arbve 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 reac i+no(9su aemym;*/i qtance 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 inducty p )y,9tuzhm 3va+cryl n5/y:or when 120 V AC at a frequency of 20 kHz is applied to it,ahmy):9y5yv y z+l3n crtu/p?

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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 *8*a wp1q .jh-j kxmb( ui9g3l:jypica 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 capacitor tq;tz2y vy+whmdom.f+, )yh+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,idvq p92 yuw- have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 1099) nruc p)lu7dipe3zwco( 18o h t;hm-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 reactance of a 0.010-mF capgq.b1/ 2jrlk fc;.etg1 tbu8y7jok6p acitor be 100 W7et6 kjkc.8 blrq12gyu1/ j;opt bg .f?

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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 1000t;( l 6wf 0shnuqjjf:5 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 indr7aa6 * kzk7ydagh9 4aw-svx*.+c zmfuctive reacta va+.hc k9xyd7az6s kz a -*rf47wmga*nce, 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 Hz10v+rlw;omrq .q- f ly if a 100-W resistor, 20-mH coil, and 1.0-mF capaci qw0r 1vrm-;qf+ll. yotor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at gc d qs88/ o,iiy;h1tm1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conqhi ;1o,i/8stmdy8g cnected 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 connected36c.f7lzi omb in series with a 20-mH inductor, what is the impedance at 1000 Hz?mcb7 .iof6z 3l

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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 serin6x1lkx;g:rhwob 7 -oes with a 20-mH inductor, what is the phlwo:g-n1 h; 6bx7koxrase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH ctx h;j0d+ bdk, ly/j 9mcnqr;-oil and 1.0-mF capacitor for a total impedance of kqb/ +9j n lydj-r;htx,cm;0d100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W regu95q0l x(qpdz(yq q)ffe; a2 sistor and 15-mH coil to get a t)apzfyedf( uq x2g (q 09q5l;qotal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series w9bpc03qkl /3ry7k t qvith a 450-mH inductor at 5000 Hz for a total3ykc7q0v 3q bl/k9p rt 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 ia x-5kkb 0)u5tnmk3osn series with a 100-kW resistor at 1.0-MHz for a total impedance of 15b055nxu-sk mtk)3a ko0 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 wit edcv*z f*-9s fclmn;9h a 20-mF capacitor. What is the impedanc-ce*9f msl df vz;c9n*e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHzkllh3ze0kx 3da ih :,/ for a totalihze:0h /3alk, ldk3x impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neededhg8ua j1sta*s73zp a0 in series with a 10-mF capacitor at 1.0 kHz for a phase az0spga*1atuj8 3 ha s7ngle 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 1.0 kHr87q-h qa aa,zz for a total impedance of 45 ,8-qzar ha7aq W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is therf+x) l6qnct 2 phas +6 lxnfcqr)t2e 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 and 1500 Hz if a 100-W resistor, 20-mH coil, and l u6vz(l dbc)-1.0-mF capacitor are connected in series?cdb ( )lu6vzl-

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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 coi. rymu)uh7-u)pqrv5 nsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected tih)r u5-7).mu rup vqyo 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 reactance,+xq;dy u6 dkn05k dcegi: it1 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. k;6y,i5xdq:id k ug+10ne cd tWhat 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, a zppv;k5i.-u av;n;w a10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po;paz5 vniw;u k.-av p;wer 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 n:n-0wso s)hk-x4 vt puecessary in series with a 500-W resistor for a phase angle of -t-kunvp4 hs: )wxos0$40^{\circ}$ 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 what frequenc/ogl r.vy/ pv+y should the circuit be driven in.rvygo// l+pv order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15kki,;n2 k pb7t.0 W inductive reac7bpknk t;k i2,tance, 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 AC circoi4k3ej97a:w bd p+ eluit 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. Whap eby ,l6.htq5t is tqy b 5p6.eh,lthe 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 circuit containing v.q b,r8d d.r4ru*kf yekx.1oa 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when ky qe.uk x4frv r,obd .*8r1.dconnected 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 cqzfw3t/ plnbyo*jb.1r ys0(8apacitor and a 15-mH coil in series?3ynoql p (bwy tjb*/sz1fr0.8

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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 *hb6ou2 c(mxx4.7-mF capacitor for a resonant frequency o6xu*x h2b( cmof 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-mH inductor for a ;hyb1h rh22mu resonant frequency or2b1uhh; myh2f 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 placed in series with a 30-W gfy l53)lc)3nled7knresistor and a 40-mH coil if the resonant frequency of the circuit is to bflcgel)5nk33 dn yl )7e 1000 Hz?

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