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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 ma( 1jlk;ogqmo+05 ngy (ddo3 h(ijjl.jgnetic 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 vad 0 qe((k jrx/ji83zthe $emf$ 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 mo ida.0l (m7swire in a coil produces what kind of change on the induce (.ad70lm omsid $emf$, 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 sj -f4.v0mfjrd t/2 kg d*i0edd9;cko through a loop of wire produces what kind of change on d0mji/ 9f; -.2f crk*gj kdvs4tedd0 othe 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 wi3 p(f 8/jd7uc hhpxni.re produces what kind of change on the induced jd(u/pnh87pchi 3xf. $emf$, 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 azr 8d:i ofk,/q 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 clcmk02 a.8su jurrent in a conductor will be thatjl0 amsukc.2 8 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 magnet is held abovedhl + 7s5ruselhz+7f 3 its center with its north pole pointing down. The stationary magnet induces (when viewed from5 fe3zs +s lhd7+7hrul 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 horizontalni 6z8msc6 iv16t g5h oxdbfq9fh)-;d table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when n1 do5)h8v6iq fh-;6sc tdgm9 fb iz6xviewed 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 magn 6edvhv* g ;ssuv3+bv,ei /lk*etic field 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;*3kvd */sv vg ,hesb iv+ul6e 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 tabfrm+8omi x2m.:aevb x 5esh296qc q5g le top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is th56c2xe9 o:ir2h.xf eg+amvb58m q s mqe direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in uq 9)q03xy g7(5sfx sv ekqmn6a region where the magnetic field points straight down. The magnetic field disappears suddenly. Whenxexy63sqq)us q7 kgv ( 059nmf viewed 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 carries an e5* y 1 y72ccwaj;mhtkfver-increasing current northward. Two coils of wim5j 7wy*acyk1f;2 hct re 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 tsozm0r sp28+m; y i7wlhrough a loop of wire with the north pole entering first. As the north pole enteymp ssozl m w;2ir+870rs 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 angular speed about an axiyye;kq -jq ;vno;85 aas whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orienta5q8jy-;;o eyk v qana;tion 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 rotath 3b)q/1tgfg jed at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced f)h/ gtgbq 13j$emf$ 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. w/2/aqx4q 3 no(gbutf
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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 lui ze8 r)g i;l9myhaf :su;msl29s60an $emf$ 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. The inwve.eg* n)-;8ckyb $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward06j v ons *o70fwb06w zghocr b.c6+eg at constant velocity through a magnetic field that points straight down. Make a statement concerning the potent6hj0bz nbo 006eo+7s ogc.* rwcwf v6gial 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 71ug* )nvjwwi 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 tranedg5qk )asz6lzvv ,:y+ 2 l;wrsforms

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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 secov2u e; p/ /prriit0+wknd. The frequency of their vr/e pi;uw/k0 p2+t $emf$ 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 v9r,4gn wn ymvj -q- tq/t+r,gused 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 e (yis8:. 8exy.gj,lceyo2b 5u vw-ck 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 loops than the primary cnbfz,r p l/5z9 ( wvy:ge)mng5oilnry/ 5w(z lfeg,bvmg5np)z9: then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than th1(3iq7 cssvyf e secondary coil t( v7ss31fy iqchen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powe)wezrkn ncd)k -,ul4;r input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circu+o wdw,,no3n kit,

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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 ideal battery of f1cm1f*as 8rh constant terminal voltage. At the moment contact is made with the b afc8mf hs*1r1attery, 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 ind y+hu, c3t7cb(xbs 4fmuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor i73+(s,cbcbt4h yfxmu s

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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 wit68tu0uqn ;by1ywa 9ny h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance Rvl9jj7)glys 8gexb zd4;ld 09 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. The time coap u +7gv*hp2anstant for the circuit reprep+vu2g p*haa7sents 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 conneca+p*l neqf7*ojuzj3zlqel 2p1 (+us. ted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required u(n f*ojzq12sz qeel7*ul +3.+a j pplfor 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 saz4hkb bo-5c 9vme 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. O0y 71)jnqzq wqf bn ncz6h8,yl;o s8tshd h-.3n 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 AC power supply. In this circuit, the cufit 0tcr/i21arrent1c0 2f/ tiirat

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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 cha sqt6 hkhxjo.x2 ;4k.wnges by what factor when the frequency is 2. .hhk6t; qxk xj4swotripled?

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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 ind. 2c2cxihky7 pm1eiu+uctive re2 ym+71ik2xu cp.ceihactance 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 aefu)sc()ze 5 tcross an inductor approaches zero, the inductive uez) cfs5t) e(reactance 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 cirmlo5(uwn3;tolics5 :( -avwdcuit, the currenwdo(:m553ul icv tl o -n(as;wt

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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 c6 6 y dslu+s6de47czaan ac circuit changes by what factor when the frequency is tripled?zd4 7 +eucas6ls6yc6d

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches dy9hcsd9.o mrc3 kzv xm6 )f20zero, the capacitive reactance of that c c06.)omdhzdsvr93 29km xfcyapacitor

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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 bgyqrvgs oje-w-*p*r- 0 - w4ubetween the voltages of the inductor and capacitor in a RLC seriq vos*0*jeru-4bg-wr w-g - ypes 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 circg .j4bg t:leho3t-( k.rib.j luit 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 increas07f n)kow mu na +q5704zqgbekes if R increases. )ke gnw kqn7oza7bu+m05q 40fWhen 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 circuitueddzi06 l6i 0. 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 circutg3s.jfgh9b :t .v4c+pm bev 4it. 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 the capacitance both doubo-6)iq o(sseqfs.5tsz . o n)lle in an LRC series circuit, the resonant q -qf ns.l)oz5ss i )o.ot(se6frequency 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 resonanh wolfn64 eu+c,emcqd -+- q,wce,

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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 RLCoxn8 sakd(1q 3wfw* s) circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiuswrd:4z 3g o; xfc(e- mpanf3 6/pzkyg. 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo yc3da z/wg;-p k6 4z3n.fpo:gfxmer(p 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 radxyn ntmz2yotvjidj. ./:,./j z1 k)apius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnet..2in v/ txn1tm/a . :o)kjpz,jyj dyzic 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 vo4yj vt hymngw26+16e32j f cm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic f6j21fhy4vt + mewy6 2goc v3njlux 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 single loop is reduce7u+gautwhcn 40mdx7c y : +)okd 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(nd,s qrk;uw*a6s (qf0: klh rl 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 wire on a squarebu aut2kuqv)7x :zq16 d6z1r6m y)qb r frame with sides 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, fintuarxzuy76qq6v1k rbdz :mq2u )b6)1d 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 area ofuwy:sn)rb 0/o)kw6it $0.40 \; m^{2}$ 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 are sb1 w- -.ywhvu7or00op rst; p.qr7koa $0.20 \; m^{2}$ 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 o6*9g9ziewj uj f 60 m flies horizontally at a location where the downward component of the Earth's magneticu9j zi9e6w*jg 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 ro;7gpp8pyw 6h 5xn7kf e*lfe33:i gvbdzx 0+rxtates at a constant angular velocityxk7;wp8 r:g0fhxedv* +yi3p6xbe g3n fpzl7 5 of 2.0 rad/s about a vertical axis through 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 50 loops and a cross-sectional area of+1zuwh3g6dce $0.25 \; m^{2}$. 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 wid nu*3t)il: 6pldk 8bqre 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 rectanguh :vxsfi l1dfsz5b30 t26:bqular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm aboutud0 l5fs2 hz:6 sbq3vx:ib1tf an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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 wiq 8yz6h,sh5d6d c :eoxre 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 simpn (hokjd5mv73mcd: f 1*rbu;hq+:mslle AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating (h5+: cmdonjrvs:dm *fb 3u1q;l7mhkcoil 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 ub52+o okbu/qp :*vzo 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 d;mt 2c q3y,kta resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ope ygi3n8 48f9bab ahp8,i r.szjrates on 120 V AC, and when running. 8nibb8 a4zfyp8, rsji9gh3a at 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.de9x bpc5b)y supply. The operating current is 1.0 A. What db.e pyc)b 95xis 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 connectem;s: 6erc xdi*q bv)2jja+6 hgd to a 24-V power supply. The operating current h* je gav x:)6m2+ ib;r6cdqjsis 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 internal resistance 6.0 W i*lpo/7:dx99qoofa o0g.zjo p s connected to a 24-V power supply. The operating current is 1.0 A at full*oa z fjgpoo l9do/9x0p.oq:7 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 r *2+ri 7dz4hbh ii 4:x)clf7 pq+jcibleduce 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 toyhcsson9(, un9tp6k6 flow in the secondary. How many turns are n t69,uscs k6ypo9(n hin 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 manum7 k/-msb0u ; vv-jkny turns are necessary in a 110-V primary if the 24-V secondary has 100 turnsn-/bv-v kmu0 ku sm7;j?

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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-turnkr l -s2g7h(dhkf+ x.f primary coil and a 2000-turn secondary coil. If the 7.(-+kfhf klr x2hgsdcurrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumingj6h.9e7a5 mks 2 txqr ru-f5kb 100% efficiency, how many amps at 24 V can flow in the secosh xqr5.u6b2 kk -7feat5mjr9ndary?

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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 trvknfi (3*8jn n;fkw*s ansformer provides 7500 V at 10.0 mA. The primary coil operates on 120f*(k*k j;8n ws3fnivn 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 300c ;gvhwzi86t 5 turns on its secondary coil. If 120 V at 2.0 A is applied to the pr6c;w85g tih zvimary, 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 on8s /ut;4uhc bw its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondbcs /8th u4w;uary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu*usem0h5s3/nqhs* j wrns. If th m0hu/3*s5eqw * sshnje input current at the primary is 100 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 sef 7w nm7xncp(q7tz82 yqz )4tlcondary has 200 turns. If tt7lc87nynpm zz7x q wft24 ()qhe input voltage 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 turns and its secondary has 200 t. :i ljt+q b eray8ss9jf51l8murns. If the power input to the primary is 100 W, we can expe5 ye jfbilj8m qta1+:.9rs8slct 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. vqpibo0w;p 6.The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W..pqobp;06 wvi Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currentzawuh1b*h9gi1i8 tsm. j02uu at 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 2u sjh011iz* 9.hwuugma tib8lost 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. yb ize(lhv65 (The voltage is usually stepped up to 4500 V by a transformer ylbhz5i( ev(6 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 3sx*)j v x0wllgenerator 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 or0xwj *)x3s lvliginal 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. A gew - lkw0mh.2sp)i2ybcnerator produces 100 V at 70 A. In order to reduce h- biwm2 y.lk2swc)0penergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. 56)tcub7(4kl7i kiv *f cl8cpj9nc zvHow much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V?pikj 45ct z 8977un6bckicv(v)l l*cf

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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 id .sr3/83-6hevm.co nqcgiqsd; l+ mos 440 V at 20 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 transformer if the power loss in transmission is not to exceed 0.010% of the oriecc+6m-dl3oshgm . o ;q8/i rv3.sndqginal 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 storef4bs b: poy:o3d in the coil's magnetic b4 o :ypofs:b3field?

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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. +sy jv2.d zdi.cl- *zkc7,e;*tjy yzm What is this circuit's time const+cd2*e* yjiz z,d -.zyk;j7vcy ts.mlant?

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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 anl 2ek0ez(l j(l/ 6lxfs AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-Vdfn1,w9u; myc 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 o vpgi4mbm 1mnx. /u,*(igt r1outlet. What is the resistance of the lamp? mb(4vogrx11*, tpi miunm.g /

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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. a7cbsox2j yng3)/ q, r 8mn/5nton;pg What is the peak current thronc ,y m25oa np8tx;q3n og) /rs/jg7nbugh 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 supply9 sysy l7ve02 a;gop,s. What is the power dissipated in the resisto9sp vs2sg a;eoy, y7l0r?

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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 m 99n8fszhrf750-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 *ea ; vuib,5j,kqai+i50-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-Wx,k 9puqz xu/p+kx 0 pg/n:qt8 resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of tzabe :f)x;)ra 1.0-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,g1g1;wk tqj y Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductivewvz, 8 -g 317eawrepvlv 0o2ce 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 reacta5c. a,6h5hmrecv; th bnce 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 frequency of 20 ld- 53rhq 5 6h*znv3smfqbst .kHz is appliemfb5-n3ts6rl5 h* s.vh3qqdzd to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to ab5e6.m(hcidu 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 capa 7p1)gipflhn 2t5yf- l72.-f bhtrqfv citor 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 ne s)9zdy7.vzc wynq+g.eded to 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 capav61).mxsl q.pxxg6d ncitor 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:hem bx 4xc.8eow-/y /.yipsq a 0.010-mF capacitor be 100 W/ .x e/i:p-omy.8w4cx sb hyqe?

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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 th(3iz2vs ori;erough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W in-8*fjsjt,8 zxlt1 yg* q hi;xnd *x;t*n8yqxtsl z,j h-8fj ig1uctive reactance, 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 Hz if a 100-W resisto5;9gx/x cuux:f tv / oyp,qib79 ivaw0r, 20-mH coil, and 1.0-mF capacitor are connected in seri/abxui:cv;y0x, g9qp9xuo 5vtfi/ w7es?

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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 anr.h fxw4a(7v 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?rx(fhv wn.a4 7

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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 smbuh (f58vrz6n4yk v u; s1lk(3vw,fd eries with a 20-mH inductor, what is the impedance atb5hrs,d48v wm n; v3u (lfzuvfk1yk 6( 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wit;lr1y.2b*uu 14 cfs x*donf glh a 20-mH inductor, what is the phase angle at 1000 buf2c1 ld ol.*1y;4ux*fsngr 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.u- 9ur/gk :ubw lc:ev/0-mF capacitor for a total impedanceu-/ k 9g: uv:u/rlbcwe 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 a 100-W zbqv0(:n fg; pw,. cmmresistor and 15-mH coil to get vp: .wcbqz,(gm; n0f ma 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 dxtoyn-3oj8j9qz3r 2 be put in series with a 450-mH inductor at 5000 Hz for a total imped j398dq- onjoyx23tz rance 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 i6 +a)aoh,xjbv ovamrv wa;102n series with a 100-kW resistor at 1.0-MHz for a total impedance of + xor m h;a 2jvb6w1vaoav,0)a150 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 iny*nxfyo );dhgqc+e+( series with a 20-mF capacitor. What is the impedanccx+n)qo; * dgy(hef+ye 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 b +4dyg ohy30iat 1.0 kHz for a total impedanghyo4d3+i yb0 ce 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 series with a 10-mF capacitor at 1.0 kH26 t8 6uj ej0qv:hwnpcz for a phase anglev6tnwcje:q0 h u 8j6p2 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 repr8h3/ 4gzr jzsistor at 1.0 kHz for a total impedance of 48prghjr/z43 z5 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 capac3k9p2;9an a im3pw tlritor at 120 Hz. What is the phase angl2m wl3;9anktar9 pi3pe?

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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 10 2l: ggen6c7aqxzmx 600-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serin2emzgla c:g 6670xqxes?

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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 consisdglrtu6ot +/l3sz1)f ts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H induc/trllofu +tgz) 3s16d tor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W,akxh-riwcp, u 456u -fruc1b; and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hr; urci65c- 1 fkwxb4 u-hu,paz 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 angd. kpdh) a,ue-le for a series RLC circuit containing a 50-W resistor, a 10-m had k.dupe-,)F capacitor, and a 0.45-H inductor, 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 phase . 0rlwki8eet;angle ot0 wl8;riek e.f $40^{\circ}$ 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 freqrdh23.,w p2yyg.uia c uency should the ciiy32h a.wrdg pc.y2 u,rcuit 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 fg( a:r(m3oqd (c )czzwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit)g f:a(dz ((qz m3corc 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 c7(ve3l ;qxnz0 gea g*yircuit 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. Whkb6-1,zq:qhhdn n,v lo, nr3 ntez*+dat is the power fa:t ,be d n3o ,qrn-hh,*n+zqldzk6vn1 ctor?

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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 contai de,qfj0*h cl/;9u otwv t q,3oehzjhi:+:/yt ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whecf /e*+/; ttdwo 3:qi,yqe hj:v9th zh,u jl0on 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 frequencyh-v;:b8: ra t zkkvj8f of a 1.0-mF capacitor and a 15-mH coil in series?kth8;vb -vr:z kf:j8 a

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant f o8z350m,htbkao7b ph requency of 10 kHz5ho3zpa bkm,0 h8o7bt?

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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 :* t jk*(g/nixjrm* 3os*yko vfor a resonant frequency of *gi o*j k3nvr:syt*xm/*o (kj1000 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 serieu9y*4jo,5dv *2oc)pnwfmr wm.5 peqws with a 30-W resistor and a 40-mH coio.9r *pv)cqdu 5 en,w5y4 fmjm2o*wpwl if the resonant frequency of the circuit is to be 1000 Hz?

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