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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 vt .7hpfjm ;s/hi kjx/-z0z : bo5niw+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 inductg2;xf 7 em(5pgx 4(hjm gs*jsjion 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 kind of chang dkl-t+d.w6j7z- 7rl tkmg ggjl2 iw65e on the inl7k- - 6lgl5w wj di+jgk.mt2zgr76dt duced $emf$, 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 xg b;0vbsi: kgv/-zh8loop of wire produces what kind of changkzbv: bg h-8iv0; /xsge 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 p/ hlzglu+i yw0(pfs,.roduces what kind of change on the inducedug (0lh+pl,fiy /wz .s $emf$, 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 fip2 wqvf ypbjlm(p:(5+eld 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 directyw))n3i pln0lion of an induced current in a conductor will be than3 pl))lw0yi nt which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mag:tm c5w2hma5tu g); h4dd klq(net is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fromh ac 5m4)qdgtlu 5;(wd2thmk: 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 x n;j xe.z7zi3magnet is held above its center with its north pole pointing down, and released. As it approaz.;zeinx3x 7 jches 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 magnetic fiemvgo my;-:a(eld vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fadese myo(m: -vg;a?

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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 mapdpw- 7i4 jpmg y7d9u)gnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fie pyd9 ju7m4i )wd7pgp-ld 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 magnetipp e3gphusw 7v2kw3n2j*snd*1ov ,l0c field points straight down. The magnetic field disappears suddenly. When viewed from above, wh 7032opldn*, ej3vpwp1h 2v* gsuns wkat 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 carriesvt i2quzcr3qv4d ,nafy *k3- )e0 swb* an ever-increasing current nortzt kur0qsd)*3 4v ,i-q*a3cn2 eywvfbhward. 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 wiryfwk-n6m l:43y; fi cwe with the north pole entering first. As the north pole enters the wire, the induced current will-fykc if:w4; ywm6nl3 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 angular speed about an axis whorc9 0r 6.i3ut eql..mwgw hlt 9z lq7y36rg5hese direction can be varied. In a rl t 0g.wq9ew 9gc l 5hzl.rrhmq3uty3i67r6.e egion 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 f4fo :6:3d m g(zw:u.frocfabat constant angular speed about an axis whose direction can be varied. In a3focfb( :.frguf4::doa w z6m 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 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.9kn e9j/96dns vc 35xhfkm by,
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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 thato+* * d7nvvmttcp:i mmn;rz65 an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field5ocb +aesf /8nsb dclb;.4u,p. 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 xr( uiw+6+vp; : d6eoeb,2u vz3wdg rt8ke-kythe east-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 rodp; vux+2v d(ekid+o 6uw wrybze, r-kgt68:e3.

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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 ao3ur wqh1v((pk 3l1 sqt a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformsv kdu8te31i,pl2w/uzrba 63 l

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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 frtfs 1wl/ 6;h307 8xz q podav.fndatn:equency of thezlf1n pn 0h3fxq t 8/.tdv6:wda os7a; $emf$ 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 devicpou; b ardj09*gyx o01e 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 thatz y4wkdzew* ltkb9uck02/8 +u

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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 re-3qr-.ctf emore loops than the primary coil then ie-eqr-rc .3tft 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 coil contains more loops thl4;3 e 8ybm-bsmej)a qan the secondary coil then i8 el ysb )emq3j4;mba-t 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 power input;2nt*-sl 7.pymtb o b.tbw; x8rm: pqg

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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 circuht;p+ t4ju/ etit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an id8*m0ukadz--0w, 7ka 5 i3cj d7gc nccgpcgw:beal battery of consta805g cmjw3ac7dwk nz :c-ckgd,* g- 7b0acpuint terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series ab *dk)3*gm uvi5r/g6uqq.hh to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thq mv. bdr5 /)qi*6ugh3k*uhgae 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 isd8at( ,,ivzgig ( 0r k7*vjlqe 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 insa(pq7jtx,rd6k + d3 oductance 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 7qikfje03;op series to a battery. The time constant for the circuit represents the time required i3kpjo qe;f70for 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 yw.z092kokh--f ko 0z zayx)l to a battery. The battery is suddenly removed from the circ.flz-z)k xkooz0ak0yw2h9y- uit. 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 s sek7 35yfa4vd qfd l6 6,i4y2rqagc/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 connectev:) y rdasqja57x,z3nh wr jbay):5e3d to an AC power supply. 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 connected to an :6hdjdse6 ;k gpk /1flAC power supply. In this circuit, the currenthgd/; 6spljkk d:1 f6e

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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 the freq ewkke / y/s3a h5w*rjkm*/p9xuencykk *wws3herak5/ p/9m*ex/jy 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 acros )d try(aw0xd7a,n*v+pn62rbln j z;gs an inductor is doubled, the inductive reacta,n bd;02rv* z7 gx(lt+ njr an6pydw)ance 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 zer (tp zvb5s7c3q /qqxa8ls,eh *o, the inductive reactan*q c/aplst(7 35qvszx8e h,bqce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, t7*wd koskdyi6nu 2b/: he current i*k b7:2uo/sk 6wdnyd

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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 chang t9e2gp f 85yfsuiehky9q4( 8dp/+ydr es by what factor when the frequency is tripled df e89d r 4t8ykpgiuh(yy2+f5pqs e/9?

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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 voltn0lm oqe m4a0 rgad3,c,ka8k0 u sle.nda87+fage across a capacitor approaches zero, the capacitive reactance of that nlcosaklduaafe0 7 4er0ad3m.+,kn8, g 8q0m capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in dfqi; q 8t9-ae ux-1uea RLC ;8aq 1xdieu9 -q-ufetseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is deg+ +i i-modbr(-e )mvdfined 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 wiz 6aj8+whp*vdh5i6 of the circuit increases if R increases. When is this statemeidw6h5 j6a wph+z8 iv*nt 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. i2*l5gb,5vacpahrr jp+(9z b The impedance of 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 c fue *lxk;c985epa(jxx fdy qcy ).;s7ircuit. The impedance 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 thed svy4w h pe.4v:wg n5avjjcdp1w6*45 capacitance both double in an LRC series circuit, the resw55 jy4v1wp:wvedjs 4dh 4 v 6g.cna*ponant 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 3 rqpto*/ u0(wpcuix 2an 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 circuit occurs w(tg zo(y5 a iuh1 a.oh.-uvsx3hen

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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 mag.g;sym l q)7wbnetic field of 0.20 T. Find the magnetic flux through the loop wheng;syw7l ) .qbm 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 rotatinj vo )n2o,u+ gffkv(7u atda29.s/hcqg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the)2auu cgh 9j a+ d(vf2/fotnqkv7.s o, 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 unifom5+ -3k klw/zasr8x qvk jh6thk;( kx+rm magnetic field of 0.20 T. 6a kh+rjs8mvx tk5+khq/kxlk ;-w3z( Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single1z runsr(gt:3yp 2. odf6l:x 6r2 oirv 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 changeglp5 m6luman4+2m:+c 4uk z*ntqpj 8hs 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 sfq ;)pwb2tus (ides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, f2w;bsuf) p q(tind 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 wirexlk, o w1q+:m9qxm3nq with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area 0dgxvv f19lxu5m 5xe x5:+nny$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location w kfhm kzc+.0g,(xa0swhere the downward component of the Eaawkm.hz0 xgkf(cs, 0 +rth'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 rxjym b;o h4)f7v0bo4fotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of ithvo7)0;b4ofx4b j myfs 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 a(zwp+7;vh d (efu6q l7vrf c-irea 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 x1 mq)d s9ojw5area $0.090 \; m^{2}$ 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 armatur ngghds0o.ko,jo0p knb+hra(* /6y2w e. 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 perpendicularhn.*k2 o,0wn/j(g ro oy0agb6hk p+sd 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 p88*bv,5 fbmk8qdbhmtrt r5z v0v b84 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 constw,fx* 82(dpf lalj6vm2p*bim ruct a simple AC generator with an output of 12 V maximum when rotatefi p(8 2b*lv fj6amdmlw*2p,xd at 60 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 gene)/byg0 p ; *9f)tvxkhsv9 ljigrator 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 motorl//zi2 sj qhcz:ejx: : 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 lt: b2.pey yxz 2)q8iemotor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it 2 8etzpy:l2yi)q. b exgenerates 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. Ts8 g kjd+,duuqa(se9yseh v;7e16i8whe operating current is 1.0 A. What is the7hq ese68d1vdw, aj i;s9g + euysuk(8 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 dz+hdg ;.s5v c6ftvt2 8l dg2f6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed8ftgs.2f t2 +g;hcd56 dvzdlv. 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 res4 mvb4yg2v5unistance 6.0 W is connected to a 24-V power supply. The operating curre5mv ngv2b yu44nt 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 primary voltap;che 7bo x6e8ge 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 tra+7 jf:e igt.d1d 4gkuu0/8hc anf7yftnsformer causes 14 A to flow in the secondary. H7h:kj.i0 a/c4eydu u1tgdf+f7gn 8tfow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessar m29oxuwiyc tr9eh89 +y in a 110-V primary if the 24-V secuh +9 im9y9xt2o8crwe ondary 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-turpgxgb,w0tcq18 um+4x n secondary coil. If the current in the secondary is 3.0 A, what is the curr0xguxt cp q 1b+m,g4w8ent 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% effz 6m4p2.xqudz 2eq3i ficiency, how many amu3pfe 4d zzq6mi22. qxps 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 neon sign transformer provides 7500 - m zlnc5q+zo+w/ip7a z) ;gcvV at 10.0 mA. The primary coil operates c/cmzn)g 5lpq z;v+7owz-+ iaon 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on xv)vou1t1(ce a/mnilq dk+0 6zi;gu )its secondary coil. Ife1uq+o16k)i(a;vm xlv) c0gudi t n/z 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 turnb:7jcs- 56i3ips562cu ynji x dyak-e s on its secondary coil. If 120 V asbne y5:6d5 ji2c x6-ci7payisj ku3-t 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and 94/) 8lyucg fn ld eb4-rgc;yhits secondary has 200 turns. If the input current at the primary is 100 A, we can expec-y 9)hy44ufc8eclb gd;gnr/lt the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tuee6fgi9syy-q; qg+ *sh5fx 7jrns. If the input voltage to the primary is 100 V, we cang-fy5hq+67ss j gxe;y eif* q9 expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turn+ 9m4d *b+/vhohtw amz)jpwd*s and its secondary has 200 turns. If the power input to the primary is 1jvzbmw+o )+ d*h* 4/pwthdma 900 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is z.4 ewphzj m z5w:,ix4x+l ts6usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if theexmil +,w5tzzj4z. p4 x6s:wh 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 ai-l+fp8ao2ogg 9 uld 2t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thr i 2+ -olgol29fagupd8ough 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 at 120 V. The volqyd e0-bo-5ovtage is usually stepped up to 4500 V by a transformer and transmitted throughyb-oq -dv50 oe 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 ofh7fimf5. 0 xyl 8z1dui 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmisz5d1x0m lh .uifyi78fsion 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 liny ih,*r4d8 kpbe 50 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 energ pyd,*48h irbky 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 l 6dhg*wv ge1z+ine at 1000 V. How much less power would be lost if the power were transmitted at 300z*g+1vhd 6w eg0 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is tow mjz uw/93 /zv89akgq be transmitted on a line with resistance of / z/998quvjmwg3w a kz0.60 W. To what voltage must the generator output be stepped up with a transformer 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 a cunh88gxlg ::zc rrent of 5.0 A. How much energy is stored in the coilgg: lz 88n:hcx's magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Whatjggc(ce(*lpv -em2( : n7amsyi4p v:x is this circuit's ve(lm( ivnag2c(x::* jpeg sy4- 7mcptime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage bdz fvq:337amk v7r.klw0 wnzb;92o q 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 A0j klvhr:yf na(;qab 4nn1,9w rpc78krf ;(xr C 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 resi,s am(9+6 fm cz-rshujstance of the lacf u+jms-ha 6z, 9ms(rmp?

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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 j. +xa ;lsq28u5enmr xcurrent through the 28 ja n5ruxm.+e q;xlsresistor?

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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. What is the power d0f/rjo i,j(sl issipated in the resis/j,r i0 lof(jstor?

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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 50ox ns u/l,r;(l z(of2b-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 50-W res/;)tse7fy tc3 rny+ b :7adrhqistor 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 resisxm4dt j as:z-5tor 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 H7t *dwz5ggk/foey0x 9z?

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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 reactance0 s0u mk+3sfj juhw1 *og1z lsn53d;br 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 14maj9vhs fh0h9r ic;.+.0-mH 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 ofc4r jl ,h,potwc0j0(x6*mc lm inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in 7 at-kwnp0(*f amd fs,a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied n 7t-aap,f sw0*kd(f mto 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 2.50a/ yzx yj5v h-12vfc vouc5(2 n3.fpjw-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 capacitor at n,a xc z3*dvjie(f ,j210 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 tr*bsb/ c:yft;o 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 10-mF capacitor hc tu0a;wuue-lg5.ca/ave 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 capacitiven+zeeb+1/,vzx mgmm3 wd u986r: dh*wk8a t fy reactance of a 0.010-mF capacitor be 100 W?/ :mm9e3 w+dmabe*8+tf du8gr,6znkv wzy 1hx

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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 105 z7mnbrcqz 8px 6y/squ7t3j000 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 circu1h)izuf /h/pamu cg8,sn)oh3 it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reac/8ifuusmhphh 31 o)za/)c,gntance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coilz ig;9,e m9nglxuk,,k 5fzgg 7, and 1.0-mF capacitor are con,n7lg ufkex mz,;g g9igz,9k 5nected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-m,3r4 wm hzq,seF capacitor are connected in serihe,qw m,rzs43 es?

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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 s bqyu, 6c bjm8j.q8zo5eries with a 20-mH inductor, what is the impedance at 1000 H8j6uo8 y .qm5 jbzbqc,z?

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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 x2 v rztl2ri/q,ywlv-3.h f* ais connected in series with a 20-mH inductor, what is the phase angle at 10lzx3,q2. f wtiv-/vlr*y h 2ar00 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 and 1.0fungx26t; p)r4x ek 8f-mF capacitor for a total impedance o epun4f26fxtk8 g)r; xf 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 capov qv *o5fiz1wx6k 2/facitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedanqi5/1 *offzx v26okwv ce 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 seri.oz3j y,zq(hx2 k wxp3 a/hi1nes with a 450-mH inductor at 5000 Hz for a total impedance of 4qhapwj ,(3xki2 o .h x31/nyzz0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with 6biw0wby/.jk+liw9s ra)-9cm z5mdx a 100-kW resistor at 1.0-MHz for a tot.-z6wwmr) b+ yjl5ia0kc9i/b9 wmxsd al impedance 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 serie(qx:0vbl jb2 t; /v;lkt ts,xxs with a 20-mF capacitor. What is the impedanv:; lv(;bt,20xkj/txq sl tbxce 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 kHz fok *lmczi y;q37r a total impedance omzi;k3 cy7ql*f 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 19c6s9uu3z b3 +xnnonj3ap9 w g.0 kHz for a phase angle ofz+9ja c9wo u3 6 3u3gsxnn9pbn $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is newkm ,)a-jvkjxabehj1 1 3ttzrw7// 2keded in series with a 30-W resistor at 1.0 kHz for a total impedancehbm )k1/a/wx1-,jt73ve jk tzrw ja2k 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 capacitor at 120 Hz. What is the phof gyz uth2(wk9ue8mf,1 z3(ga(2ko(1 tz 8g u,zyfh9uwmgef3se 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 7ob fyvkt-228zk6 qjx.+krx p100-W resistor, 20-mH coil, and 1.0-mF v+k7kt y8xq oxp6z.r2kf 2b -jcapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resis ib pq4pm0m wn/7qo/5itor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supplii nmqb54qw p/m/p7 0oy. 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 W, and a,bzcwijo (kr9sv2. )s ;6rn3 t4otjpkn inductor of inductive reactance 30 W are cin3br k; jotjs4v,9cwp z6s)rt .2(ko onnected 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, 5evb*-i7ks khs-skrm j:fk02 d*) yina 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p5ssbkfk:-vj0i k*r2eis)7d-kn *hm y ower 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 ne3.f vmoh luiy9 rj87px 8nf4,scessary in series with a 500-W resistor for a phase angle of hi9,3o7jy4 v8x8r smflfp.un $40^{\circ}$ 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 freq6,febeli oxb3 uo, 0wh,mre,2-6 xkovl+ e l(cuency should 03lr 6keex -, mbv olbehi ewou,ocx,f(+l,26the circuit be driven in 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 witispfmtl, t(- ;+ci3coaxn -6 ur+z a*ph 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power suutsf(,rca3i6io p- x-c ;tn l+mpa+*zpply?

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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 ctb 2 ,o3umoxqepfk,, y:sb8(circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an imc4tk-rj559deus pb p /pedance of 60 W and a resistance of 30 W. What isk5 /d94e-j 5cpptsbur the 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 a 50-W)7s51 zhb .e htggm7 ;hwt,vgy resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected toght. wytzhg5m7 7bv;g 1hes,) 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 capacitor and a 15-mH coil in serio8ue.0jc gthfi2zr) + es?8h0gj)io uzr e2c+tf .

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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 av:qmam ; d(up jjp-+1a 4.7-mF capacitor for a resonant frequency of 10 p;mdm (uq:a+ jjva1-p 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 need vkb)uyy*m, 2 fz lq6qm;p3ep/ed in series with a 3.7-mH inductor for a resonant frequenc uk;,p y vml)*qfp32zbeqm6/ yy 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 be placed in series k s)fd4c 1/y+i.r.b1wt f fikgwith a 30-W resistor and a 40-mH coil )4. f.is gr1bc+kfwtyidk f/1 if the resonant frequency of the circuit is to be 1000 Hz?

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