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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux except;lvcxsn/l(p6( n zpptp;k6 *k

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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 thavo6mde.nd s*ws ,0r zb9y*, jtt 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 coilsp88 bytv7-49f1 6khca:co idyk8)cw8c s lme produces what kind of change on the )bc l ecva4p8si :9kk88hf d176ty8c-yoc swm 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 loo(b * g,tt8kqo4 o 56ggy8serdtp of wire produces what kind of change on g6gt8*8ob5dt k ryq,so(g4 te the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind ty (fcb*9sp4bof change on the indu( bcty pf4sb9*ced $emf$, 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 ma1:3.m qzbjz,cg + *ywyy,gk uwgnetic 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 conductoru 3u -ye,+rkgx kwi,4o psr3/m will be that which tends to produce which of the fgr4+ur/puk ,ei 3mw,3o-s kxyollowing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above/+c/ssiocw n 7 its center with its north pole pointing down. The stationary magnet induces (when/sc/cw ins7+o 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 magnet is held an61ze 8,+oe4ye4bqil)sk c3gtl 4iqjw6ly/nbove its centerqn4 8+kqji3ton bzwe gec64l/)se1l6,yi ly 4 with its north pole pointing 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 to4lo/(xb ge3s ap in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viesx(o/34 leg abwed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in aw m,ocje(m -l. region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of thml.mc(, e-wjoe induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regios/j+ ls/*lol(pjab 4miw3, jnn where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of t 3j/sj ja,w (l4n*l+s /poimlbhe 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 carries an ev/nz /ib*zbup:b2gsm;s tuk9 2er-increasing current northward. Two coils of wire lie flat on the table, one on either side of the ukbn ;z2p/s gs9bi2zm/t u:*bwire. 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 w3 ty l0)t)m4h/uhdcayith the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed m) lah30c) th4 /ytduyfrom 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 ab3 1 dagurgr7/uox 3e)g p6*uxpout 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 axis of rotation ifupg)upro/a g u* gexr1 7d3x36 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 cono(k-kh3 r:8x 3wo slhastant angular speed about an axis whose direction can be vsh 8korwl kxh3o(a 3-:aried. 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 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.l tm w133+k the9*hski
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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 t f: eiewh)/es5hat 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 field. The5f;a b4u.c zm*ig87ewnp- g hv $emf$ 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 (oryva4224ai(jaf,g bi wn gf+y:iented in the east-west direction) is moved northward at constant velocity through a magnetic field that points st(gfjfbgiv2,:4aa y nai w y+42raight 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 , m:wem:i r2m/fzbyyn638uxu rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfoat:) *wwb3kjdrms

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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 sec tpjym;fi8epu741b0 yond. The frequency of thppe 4m;b178yift u0 yje $emf$ 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 devic+skq)7km;x7+ixegd v e 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 devicg o4 nh8yvu.4fgh7 :cce 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 contains more l bj+g)qy+ )3c4 6ctq n3eyuu*o t)xgrhoops than the primary coil then ijo 3y4qt+)r6n 3*xeh+g tbqc )gyuc )ut 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 +ru5ylpkrw yuv:,j /pd;2d-g primary coil contains more loops than the secondary coil then it yp-rurl ,/:2puvg5 +kwj y ;ddis 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 inpp iov*t))rka c5:w*n s4fhiy1ut

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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 circub+. tk6jwrr.o 4 vc ohji;rnk5.,yza4it,

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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 c.nm*w e7c86. wxvmznconnected in series to an ideal battery of constant termina7cmzwc.*n 8vnxewm. 6l 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 to an ideal battery of colbaqfo8*()b-p . fskq nstant terminal voltage. At the moment contact is made with the battery, the vpq.-osbqb*()lfkf 8a oltage 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 connected mj6cgh s f1,11bq3eveto 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 indu5-n mtauch,.g ctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. eeolscga4 62v5 bewx.(6rx0g The time constant for the circuv5 l2.exwe4 (6gbg s0ca6xeorit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery.fk x+nl m3w;c.yo5tcm5uw 47 j The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreaoj3y4.;+tkxwmnlw5c 5 mufc7 se to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exceplvj;l ut.; 1eujt jbu0;+ wfw;q2l w-xt:

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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, th rxoyt/f3 2d-ye 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 c8(t7gosksqwua8m1xe ; ,d 0y honnected to an AC power supply. In this circuit, the currentk;d7w m8tues 8xyq,1(s0go ah

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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 ciz4 4p31 rp(ye kj sxi*qolws.4rcuit changes by what factor when the frequency is tripsikz* ye.j4xqs l1p w3p 44o(rled?

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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 thepys25ce0a- w4 :zxoaz faf4s 5 AC voltage across an inductor is doubled, the inductive reactance of that inducx ys:w 5-4azz4opf5s0 aa2fector

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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 induch-1ndnm4 bf4a tor approaches zero, the inductive reactance of that coi 44ad-f1 nbmhnl

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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 thi9sl+nfu h3n7 ts circuit, the currenthf9nsul3 nt7+

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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 4ny.r;1 c2gz*cd kz)bwby;f8 a (fqxgwhat factor when the frequency is triple.ygfbz q*(4;xc8ga fzw2drck)bn y;1 d?

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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.oz5/4ppzhd l voltage across a capacitor approaches zero, the capacitive reactance of tzpz /45lhop.d hat 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 cb 4 73cmktc7mmu;jvw59s5lhqapacitor in a RLC bkqtm;m7hlm4 w73s5v j cu c59series 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 defined s fig5k56w+qi jh(mp9 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 circuitgs sbk2ns b;d03y(l-f8vbs v6 . The impedance of the circuit increases if R increases. Whebbk s0-dvfnss3s(vybg8 l6; 2 n is this statement 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 circuhd 9 vqm52/wcta+u9f -l9 hsujit. 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 circuit. The impedance of)ejf2* 4iuil igr(c2a 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 capac(57hlou*jelh 4hobpe: 5h h e8itance both double in an LRC series circuit, the resonant freqhhh(4obje l: 7el85p* eu5hhouency 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 drivr6d8 /fo*brsp p.mc/t xy.gk0 en by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whenu.-hkp 1fz 2ok

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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 rbk8 r1 lj lodn+39:8t3hjwbwlotating 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 vec38r ll9 1bh+wod :kbl3jn w8jttor 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 fk7b4 a9n.p/0usghj adield of 0.20 T. Find the magnetic flux through the lsa au9d/b 0jh74kgp n.oop 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 0.2./3p qe2xw; smieh6hr 0 T. Find the magnetic flux through the loop when the plane ofh6;h/ew sp qrie3m2 x. 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 1u na2s 0pw8hmadjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fg8 a3wmii,2.jf(*wl and ;i1 jjhw 5kfrom $4.0 \times 10^{-5} \; Wb$ 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 1j0- z/) iu z4rtgdz.ej8 cm. A uniform magnetic fielz j-.)zz40 jd/guteird 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 15 turns and an areauo8q;8.8h 7b w fwoiiq 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 areao9amj i0j umufk :v f8;8gh.(n $0.20 \; m^{2}$ 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 wherexjc0 urm v7t/d t3t5r9m7mt,r the downward compone3dmvrttrx 7cj9 r75tu,0 mtm/ nt 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 angulas5rtjs e w/+0 q+fefys;tb 74fw a0n7kr velocity of 2.0 rad/s about a vertical axis through onew7b0w;tes7ftjk afs rn+y/ef04 5q+ s 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 50 loops and a crosba3 +h ,je-:qzfs4nwzs-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 cons/ ix2bks-b(mc2s; foeists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each ly lt0mq-9ysp 6oop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axi l0m9yqt6- psys parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area lu3+j.ckd82 lfjtxuvr6 8m0l $0.090 \; m^{2}$ 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 of 1 axxiyi6fh ,t rt-827b2 V maximum when rotated at 60 Hz. A magnetic tbhxf26t7i -ri,xa y8field 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 generator with a maxpsd78l: jh mbd (q3ir3imum $emf$ 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 operac3:ta jmh l wer1sj3*70qyz ,dtes on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opgu8( (cf )d0 ehnpar9fd6c( lowi c(i)erates on 120 V AC, and when running af fdr0)gl8nc( 9 d ui)chpe(iw6o((act 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. Thn p bv)omby8gy3j:gbl-pfs1(y53 sd-e operating current is 1.0 A. p(dbgbsbn5 gy:)-j y8fyo mp33 vs1-l 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 6.0 W is coqik(.f sooy.y ;4ve j*nnected to a 24-V power supply. The oper y*koyv;jqos.(f .i 4eating current is 1.0 A 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 interndd/wz +5ugut )al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What)5/ wg+ud dtzu 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 needhk8r;y((k .qr(h f0 /tczqtieed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn prima2sau 0)gm)a zury of a transformer causes 14 A to flow in the secondary. How many turns are in the secondary g))2amuzuas0 ?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-Vsj-5z7tns ;u 8 y-skjk secondary has 100 turnn8tukz s5ky;-jsj 7s- s?

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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 secondb) m1jx/5tbsvary coil. If the current in the sjm)1xb/v t5 bsecondary 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 transformer. Assuming 100% 6fexbuuw ) ;vl d1*)eqefficiency, q; dwv) le)buuf* 6x1ehow 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 j4;nv o(ipm7/wzacf4 neon sign transformer provides 7500 V at 10.0 mA. The primafzjm (nc/o ip44;vwa 7ry coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns je)y0 m, ziv+ 8dktyv4ait5 e,6ias6hon its secondary coil. If 120 V at 2.0 A is applieykt si)5a t 0h6i+e4,yzv jvdamei8, 6d 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 turns on its secok xr6aueu1z+0hcoyt;k -. pc,ndary coil.you eh16;k0uz,pct . kxrac- + If 120 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 andx7 5xuomdhwr/ )zz.8m its secondary has 200 turns. If the input current at the primary is 100 du5xxz8.moh/mwz )r 7 A, we can expect 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 20w4dzasz1)u -h4w:* ps :zo) p 6vdxquj0 turns. If the input volta)pzqw- 6adz)op 4s:vuj*z h4ud1sw: xge to the primary is 100 V, we can 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 turnenbe q6 v04i/vs and its secondary has 200 turns. If the power input to the primary is 100 W, 4 ev0evi/6bqn 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 usually steppedkv a 2cc4o-fl. 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 the primary c k f2-.lo4vachas 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is,fj+chtd2msz-ua4 i-:vt z)w usually stepped up to 4500 V by a transformer and transaw-zd uthf it,4smcj+- 2vz):mitted 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 at 120 V. The voltage i 3q7 o2hvcqew2dn/z. ls usually stepped up to 42w2lh z vd7coeq /.qn3500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A geh0p/c (l/hawq nerator 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 10l wacqh0p/(/ h0:1. 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 total resistance of 0.60 W. d6n: i;n*hykh k0:sss4zelh, sw:.abA generator produces 100 V at 70 A. In order to reduce energy loss due to heating sl n.n4hy,0::ahbi *kw s;s6 :h zeksdof 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 lin/g*fo wqrg(gp4)y rlqe(3-cie at 1000 V. How much less power would be lost if the power were transmq3 f(r) lqwoi/ r(-epgcgy g4*itted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to b.nd )ho -suij.e transmitted on a line with resistance of ji.o unds .-h)0.60 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 current of 5.0 A. How much energy is st+b /*8bmcrc q9gjr 4sgored in the coil's mag* b/9rqgr8cbmgjc 4+ snetic 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 resist tc0fn; trt-y3or and an 18-H inductor. What is this circuit's time; -c3tfrtyn0t 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 voltag91:t;vmdgi wqb5t6tpe 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 outlet. What is the se6t2 +z72,niwjy5l 7d0n qwb d h+kmfpeak 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 thecu7ze ypm un;hn2: t4; lamp?zn 2m4;ypue: ;nch7tu

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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 supplgtq7dq24(r(wx f /n dry. What is the peak current rwqrt/ 7 q4dxf(gn(2 dthrough 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. /+ v) lmx 5tqy+gsypf+ ;eo4yg What is the power dissipated in v ++5;otl+/gxyp) fm4g ysqeythe 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 snm/a v,v1h h8resistor 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 aplzl 9.q*72cetma r (x 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorira; 9 h 8lqw9qk16ucv 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 indu-db9 wdohi+e3iu 5my3ctor 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 2.50rvkx )7bt 7yllrtqo,38 2 kv3e-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have .yiwes z *n pl+*9ardtjn+32v14.0 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 necew 90y y;utch/essary for 157 W of 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 a 60-mH inductor when 120 V AC at a freqm e 4*k05i0g /cha-ze9+eh;pi5 cfthiu 6oaowuency of 20 kHz is applied *p+ m5/oe t4i95ec ; zi aeaw-go0h0ci6hfkuhto 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-;3pb 8lysz+c omH 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 r7 2jt+j8bcve) j uj5ljeactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance a c9z7 cj88cwydt 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 hav)ff7j xr hjpc3r .+ym+e 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 capaci 2gvce.pjv)diiyw) 5/tive reactance of a 0.010-mF capacitor be 100 We ipjy )gwc.v)5vid2 /?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hzz*w4,k1r 9hhcgj 4heiuvo3h6 t 4ps+m 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 w 7u;knf43;moy 3s iwk94yosyeith 12.0 W resistance, 15.0 W inductive 3fkikon y yo74ym3ss; 4uw; 9ereactance, 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 atjfk dp 2*+rxfa8ld -2x 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor araxk d+fx8 jf*r2dl-2pe 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 1500 Hz if a 100-W resistor, 20-mHjd wmufmn5-/ ksxr 12- coil, and 1.0-mF capacitor are /unxjm-m2sf-1drwk 5 connected 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 connected in series with a 20-mH i80ibxyz*zpu) x*0yr rv r()eo+mlqt6nductor, what is the impedance at 1000 Hz?xu(tm*00er8vi *bz ly+zxo)p)6 rqry

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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 invu7zlmqbktzb 7)m/6 8 tpdbo0 +iu7t . series with a 20-mH inductor, what is the phatqbv+zl.to)/ti0 bbum67 z 8ud7p 7k mse 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 ;: l cv- h;wahgamh;6ha 20-mH coil and 1.0-mF capacitor for a total imp am;hclh;hv:;ag- h6wedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with zbpo9xc t6a/ox 2uz1x* i27 wya 100-W resistor and 15aw 69xz7oou2/yxpc2tzb 1xi *-mH coil to get a total 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 s:z r 54qg+d2q:vfew*0rygtj 6; ypy vzeries with a 450-mH inductor at 5000 Hz for a total impedance of 40000 ry;y2v64 :pzq*q+ zg05fj:g devwy rtW?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must beg j8nt51qwbtv cegq.4z w 7m70 put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?nc8twv1.g7q qg ezj m745b0wt

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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. What is toubd,x+z2 mv :he impedmbu+xvod:z, 2 ance 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 aj5 aat; 0uu0zft 1.0 kHz for a total imzaaf;u tj050 upedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in seriesk.57o c g3-; brfwjqgm with a 10-mF capacitor at 1.0 kHz for a phase amrg gf;-5b7c .wk3oj qngle 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 se* pifa*tikl*56g 6 sokrnw;2 uries with a 30-W resistor at 1.0 kHz for a total impedanc*6o2wgs;puf i kt6k alin **5re 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-mFf 4zu2 *i3mpbl0 p7mcl capacitor at 120 Hz. What is the phase anp l2zif30 m47bu*c pmlgle?

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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-mHoafw:2pc6fx;l qvts/a1q4 ;c coil, and 1.0-mF capacitor are connected in series/:1 x cfq6lavfa4pwt;;qo c2 s?

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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 resisto6odoyqniuff2cj06 / fg7u48t/a 0q zcr, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-Vou80j/ fc4fg0d6/y c7qo z2 nqufait6, 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 capacmz6qo 7yyrn-u5xm53 a :vp9guitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Wh35vm97a-ox:urngy qz5 y upm 6at 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 Ryns80q .pv:l*vu p2yhLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indp v p0y.s8yv:ul*q h2nuctor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phpvx:w h6isu, 9p5z qj(ase angle ojzpuv xs :6(5h9wqi ,pf $40^{\circ}$ 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, Lz ; ve3ixpqpu0cd- 3a( = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fpic -vqp 03uaex3;d z(rom 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 circui 3cto36m mccv4v,p7ift with 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 supply?mivcc6t3, p 4omv7cf3

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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 anw6s 5*xz 0pksg AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 ikgt /ex87 ny aev)g34W. What is the power facy4e3gna87 ex)tk gvi/ tor?

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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 resistor,wk 9smi nm4rlok)x 596 a 10-mF capacitor, and a 0.45-H inductor49sk5mo)ir6x m9k lwn , 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 capacitor and;puyh 7 6irddviy ,q(7 a 15-mH coil in series?7,ruh i;p6qd 7yiy(d v

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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 capacitorx/ yy* 1- hbad*zhjgn1 for a resonant frequency of 10 kHznzy*h j gxa1yd*-bh 1/?

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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 seriesnb fk-m c-4 blmi29y2n with a 3.7-mH inductor for a resonant frequenbi-- ky bf9c2nmm4l2n cy 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 p 1mo26q8xatib9xu8s be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be8x1 6 to8b29 pqusimxa 1000 Hz?

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