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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 o 6 tp m6;sbclxa.xy-v 65ba7ezf magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that1/adn/lh lx bvpv 6c,5hjk r:* 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 ,pdiq6a35u ahax26 ebg(rw7w loops of wire in a coil produces what kind of change on th gwx,(7a r56b6p h uqaiad3w2ee 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 4op faghw127 j/r t4*ijc iia8magnetic field through a loop of wire produces what kind of changecr4 pi/o8fj4 7*t1aihg2aw ji on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind oh.x rzcl4jm ti-u9*x )f change on the inducc rm zht-u.x*ix4 )9ljed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field cf5jitu-4(q2 m 1axi+2khhrtan $emf$ 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 ind .,vh rex*z.c efoi6 qkji 61wl.11sfluced current in a conductor will lh.zxw1rsj 1k,cl*v.io6 ie61.ffeqbe that 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 wd: n.0ao e1b;3 +zosspr mart, ps2r18z5 ywgon a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inducess se ,2 m3nspww1zz8 r+byg:o pador0a;15rt. (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is he2zi vm0mkv6u6j (p ckxu(5qh6ld above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces2(quv6 mpu(k6cix hv zmj60 k5 (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 3n72vi wo4o o0gbo dtvts8.3rin a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in0w3tdsvn8r.o 2 ioo47b3 tgov this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the s(pfpx7l6:lq magnetic field vector points straight up. The magnetic field suddenly grows stronger. W7(xp lps :ql6fhen viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regionh:y8w..j x czg where the magnetic field points straight down. The magnetic field disy. z:8wch gj.xappears suddenly. When 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 horizontam55lb9ae7 :7wvz b:oc eg ibk17q,xzcl table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on1mqb97oc: v7be, la kzgzi 5c7w :5exb 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 t3 ti/ n,; 6oqqm73efjw:dht ca loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abojh6 nt3fic/,qqdet t7m; o:w3ve)

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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 k. .zbo bd+3z uqenu;c.zv p1,at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whatu oqv . b1;.u3 pnzb+e.zdzck, must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constdyx:,+n 7 ic uj:s;qcyant 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 rotatio:j,s 7qnxc y:ui+c d;yn 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. hms2apj /)u(dnar7l*v ye;7ylxw47 i
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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 d/qp y /:,cmd(+ar 5uox o4lnmthat 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 fiemt ;6c ddi5. hfqo2/9n uuz0bsld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the x,n*)o j d0bljeast-west direction) is moved northward at constant velocity 0j, l)bnxo* djthrough a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotan5rjpb06v1 . cbfvew54,ho 3zr yhhb4 tes 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 transfojy,fz 18 xyydr i1)kw/9f )-slnyj ,ojrms

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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 c7;3 j z ma+b60 rqk+kjb4ry2wmqn3wseach second. The frequency of t k2jjmn33wwc+bzr +; 6 kqbqmr4as7 0yhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used ; / (8mwd,oknz7otvk hto

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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 th*wnsbvan 63+y-j l-uq at

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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 co..ca emo ua(g72da4y kil then it isga . d.cyome(ku2aa 47 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 mo5dsl8( (cwmcaajbf.a 4/b 2bnre loops than the secondary coil then b(afc s4(a b 8l2 jncab.d/mw5it 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 om2litr9p*2 binput

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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 resonantbr098*eb vbo(deiq*qkj0v(x circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in s7aokt e4;-muh gzd7pida5h+5eries to an ideal battery of constant terminal voltage. At the moment contact is made a54hekad; +o-mt ih7 pz57gduwith 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 seriesz/u*, f7 ss-dqjbai)h to an ideal battery of constant terminal voltage. At the moment contact is ma)sba izs /*jufq 7-d,hde with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with induguyk trm-+cm(p j.sjy//(gl 63kiv+ dctance 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 wit :/qk xu3a v1fx:4uyxdh inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batteyv-rtg60xa,dumxt;)s1e 9q d ry. The time constant for the circuit represents the time required for the current to reygxxv-tuq ra d6 d1t09;s )e,mach

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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 epo b,ezu8kv145,bqfa qua4:connected in series to a battery. The battery is suddenly removed from the circuit. Tkeoe,4zab,v u8qqfa :b5pu 14he 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 units excpdeyis w.kr o3x q)7/6z 1)pgcept:

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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 powqooy5a2xmalnhv9 gbn 00l)9n 3v.e o8er 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 AC power supply. In this cior7 ;nv8hbb.ircuit, the currentbb8; nvohri.7

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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 chanlj c* o )gjm,4bmix7p7ges by what factor when the frequency )7mmpi7,cx g o*jjl4 bis tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductcs;2f85i ;jg/xvoj/yjvb40uv utl 3 cor is doubled, the inductive reactance of that in v j;o8jj0vg bs52clcuv /uf 3t/x4yi;ductor

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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 ind2k54sd6+4fj nw0kt,jzr 7nm( wctvuxuctor approaches zero, the inductive reactanc fr4 nt5ns wju+kw,jk24tz6cvx7d0m(e 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, the c1rcw;kihvx kn81 gf00urre81vn 1wgf0 i;khrxk0cnt

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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-c n5pq-v h/vk an ac circuit changes by what factor when the frequenc -k/-v hcqnvp5y is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acror5tej-7st 3s6 l u lph1*k,ujjss a capacitor approaches zero, the capacitive reactance of that capacik r13t7p*js5te-ljs,uj hul 6tor

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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 lj*vkl l)tm,)in a RLC series circul *mt klj)l,v)it?

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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,2*kn:t j 05syfrvp2ejt m rm) circuit 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 c 6(hp o.cwax dc;n2;bfircuit increases if R increases. fob;p;2cxd . (ahwcn 6 When 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 circuit. The impedance of the circu )oxa:ww +8gwi n4om4yit 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 the circuit iyf-0g x1gu guh75efx bo,: o9zncreases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an L6 bo0k;w 6qkohRC series circuit, the resonant frequency of that circq 6o w0hkb;6okuit 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.d0r0tip/ sft9pghptmu/y ) 2) 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 98l(t( zbskr;3u: )g yyi2tys g;xafh RLC 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 radius 0.10 m is rotating in a uniformk t9 pzye.2j5b magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnk9zyte2b5j. p etic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiekv+e-q 1:gxpsld of 0.20 T. Find the magnek+p gsx-v: 1eqtic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnepx2v( 3 a9o+ctwod/urtic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are atu 2x(r3dw/+top9avoc 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 swsk8nw 1 -qe 33pzdy.x1muhr3ingle 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 chag + ,4piq5pjdtnges 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 oni:r.(* ptw nsoi5ks l8 a square 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, find the averakislo( s *nw irt5.p8:ge 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 ad(d otyfi*xvj;b32e (peq d/9rea 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 and0vc dalmi .fgz:n.t3rev v*( 6 area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontall0uo.p it4y(bs5o2 cn 7g 3otbqz/fu(c y at a location where the downward component of th.0of p/ nocz2g7sbtoi4qu5t(u(bc3ye 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 angul8kh .9(q9 zfe xwrtyww(6yyf/ ar velocity of 2.0 rad/s about a vertica 9xw(ye yr9yw6./( fzqk tfw8hl 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-sectk8nx(v8 qdr)f j sb m/hz-89hjional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 10eg 9ncajsa.gmuu+kas* 3*eg02s, h* x0 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 lo6hu d 0 b-twerig+.m6gops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be +d-t 6ie h ggrwbum.60the 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 consisxx39 vfnsrq. ,ts 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 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 simpvknxb 0ikdl9n 1 ;,4n+0(rva/m zspvq le AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. r(0nx bvmk s09 +,;dp nlv 4ikzna1/vqIf 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 generator8f e2u bs;8pzc with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resisnk/sv*l arq75 fk3e:u tance 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.-;o(yne n(7k gmyh8nc The motor operates on 120 V AC, and when running at ful-nnh(g kyn m7 yec(8;ol 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 resistan74pyhz n ej95y0.kz;r lclqi 1ce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the yjnh0kez.rq;zyl1p 7ic459l 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 connected to a 24-V power s xbybydp- .xa : 9ofx5ti(z;5kupply. The operating current is 1.0 A at full speed. What iozf x5-a:5bxyyt9 kd(.xibp; s the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to 44 ) gp6+ily/ezfqhzaa 24-V power supply. The operating current is 1.0 A at full pqlf4a)z hz6/i 4y +gespeed. 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 reduce8 vj:sjon8xva( -g/m 08lh rhr 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 u;uo7-*3l 9y;so y+natr pic gtransformer causes 14 A to flow in the secondary. How many turn* yiog y;+suop9-c;n tau3r7 ls 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 necessary in a 110-V 0ru:7nrq06-gbbkrug primary if the 24-V secondary has 100 t :grgu0k0 b- rqr6n7buurns?

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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 secondary fjt;nu)q /ie0 omg 9w/coil. If the current in the secondary is 3.0 A, what isn/otf)0 ie;g j /wqm9u 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 az vr ;kpc v7u-jpw mv* t+ 9w+uiyo;y*ovd,,b9 transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secpu+v,k-, rcwyw 9 vt7yi;d* +ozm*jbovpu9 v;ondary?

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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 V at 10.0r u5q. *s:oivw7)adleej2t ;a( uan;k mA. The primary coil operates on 120 V. What does the primary drawsv 2li)qdneok:5j;u awu t(.*7 a rea;?

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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 t6 ;) k5xmn :nzaa/nuruurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vol u n5zmukanr6nax ;:)/tage 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 c:xxn ty wtq(+7oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what currntt xyq+:xw7(ent 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 hago--z-: p ob76f flqtas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secob67-pgq tlo f:afz--ondary 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 apmb*u41zkia rks +15 qnd its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to brma *s151z+kq4k ubpie

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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 andsj4 pl(olq6i b,va67u its secondary has 200 turns. If the power inp(o6u,lvqi74baspj 6l ut to the primary is 100 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 usually steppedpy aw;b 9 lhl*up76(5 2jdnmgk92epzw up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find thdzg;(6w 299uh 5*bm plj n7lkwyp2pe ae number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is v:7kwu2q:iz)sx:mxey 1jnp +usually stepped up to 4500 V by a transformer and transmitted through azi:p+2wjvns: 1ky7:em qxu x) 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 is usualvko: r 3fgsuq 4yd148m-a8xhi ly stepped up to 4500 V by a transformer and transmittuo dsqv 1-kx8 yfr8m34i4g:a hed 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 x-c p7gc-sb-xt1sh a5km 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 transmhspg1 75-ac-b- tsxxc ission 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 lih rfa+;y6k9uu ne 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 perce+uyak ;r9u f6hntage 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 a: r2a e sf,(,thm*e(aglae4ett 1000 V. How much less power would be losr(aahefe,2 ,ga*tm (4e:etls t if the power were transmitted 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 atghkq 5c*f1(mgz3p 4 :rlfre3t 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 wit33pcqg(5:fer r h*glft1kzm 4h 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 -:rk ln0vl bz)s t0;t3soy8 ykenergy is stored in the coil's magnetic fie k00:bt;o8vyz 3t nsk)-slyr lld?

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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 inducto8.,4o p jvg;rbed*phwr. What is this circuit's tiv og. *wedh;j48bprp,me 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 vol1s6-s *tl-x:n nca vbgtage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. vjzw93bilkndro)t ) ol)p-/8 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. Wxs9xwqbmrt.oh, lb5,s 6j4 7ng;jl z 7hat is the resistance of the lamp?lx b9bmlzw7,hx4 5n ;gt6.sojqj,7r s

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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 p 9khj pz vt(;-ntog.0tqs;a-cower supply. What is the peak current through thnj0;t-st(voa; cghp-qt z.9ke 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 - t4sgt+t-hxse2lcbz /t)6 +pyn wfc -to a 120-V ac power supply. What is the power dissipated intc es ft c)gltsp ty+-4nh-26/bzxw +- the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50- 0dr2yoppw8f,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-/ 5 3vcrld(;n,mvmey zW 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-Wr/j rpwv rzx9e d+1sx2a k5);j 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 a 1.0-mH inductor 57evpgkug36 9 yxo2c bat 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 10 gv/(/kfe svm)mr)8kz00 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 wi ezbm ztc;56+mll a 14.0-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 oml3d5qgyy+ zs// jw:xn *wb 3gf 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 frequency of 20 kHz ismkw9)g pj-6ciybi)v3 applied3iwp v9 i)6mbj)y-kgc to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110p25uza:zvl1 d -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 capac+ s) :mklvzjh/itor 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 capaci9/ ib u6sdq7b yfc7k,rtive 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 f0iii1 z/krnwgi:+ hq z1b;mlqa x8,7have 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 capacitivefrkp229 lz ks)g*n:bv reactance of a 0.010-mF capacitor be 100 W?* sbn:r vzpf29k )k2gl

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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 Hz and 5+bfem5; y(jxc+ka d; e.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 resistanubpy(lwe9.: zce, 15.0 W inductive reactance, and 10.0 W capa:9b(yp.uzlew citive 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 resistor, 20-mH coil6 va0c5t+yitua ;sa q/, and 1.0-mF capacq;yta 5sac6 ua i+vt0/itor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH ssg86ut (h6t (4dygyc coil, and 1.0-mF capacitor are connected 6 ds8t(h6(gcy4gts yuin 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 inductor, what )kzx 5by.rkd(z: 7onz is the impedan(.7d5 z ykbz :)xroknzce at 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 serieguy e-aiqa;rq2;5* ngs with a 20-mH inductor, what is the phase angle at 1000 Hz;a5*qg2n g- q ea;riyu?

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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 omq+75 e8vvqb a 20-mH coil and 1.0-mF capacitor for a total +8m o57eqvvq bimpedance 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 res 0 v +gxxczdlq(y.4ok+istor and 15-mH coil to get a total impedance of 110 W at 2o vdx+yg ql(. xzc04k+000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mnaayg8/twls +;u 9xd. i(bpz .5m a3tzH inductor at 5000 Hz for a total impedance of 400n5sdipl z 8 at3gxbwz( t/.9;u.aam+ y00 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 a 100-kW resistor at 7e q0a5)p .l wgbiw/wr6mhfb1 1.0-MHz for a total impedance of 150 5 l.rb/76pef0)gmwa qhww i1bkW?

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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 2tp/yvm csz82 .qow8z8f;8rhs0-mF capacitor. What is the impedance at 1000tv /8r .8of hm;8q2swpycs8zz 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 )ceica 9y8dd, at 1.0 kHz for a total impeda 8d)iac9y ,dcence 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 ss/iz lvfp *-+jeries with a 10-mF capacitor at 1.0 kHz for a phase anglzj*fi p-+l/sv e 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 resis k+u ia25x-yhe(dn(awtor at 1.0 kHz for a total impedance of 45 W?an-ey(dw2 iau 5h+kx(

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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 ,a10 1tb c;csro2amoc at 120 Hz. What is the phase anocc1;a 1rbmt s2, c0oagle?

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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 xlsim9omm *k(g-u4+6 civw9 e a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seri 4(si lg6cokvxm*9+u-9ime w mes?

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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 resistor, a 10wdb1zp ir+fm5a5 u+,t .0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currentd5im f awt+ zu15+bpr, 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 eq* ay e3j;hk7q49zji of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourceek;aej3z*974 ih qjy q. 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 R2)tk,uu (vsy :6jsbwob q( y+pLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor(uyu(yb :,wv k)oq bssp6+ 2jt, 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 resii6rd7 xojygk-q4: q8 4.qyan cme5 th/stor for a phase angle o 8r4nd.q7x:tck i m j4eq- yg/5haqy6of $40^{\circ}$ 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 = z*x3 7;9ylrih h9 djtc10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dri;ic7 3yh9hx *ld tjrz9ving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.+ n+ksd4ulgmib-js , (0 W inductive reactance, and 10.0 W capacitive reactancensk +l(u,-g j bi+ms4d, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuiishej- eb3p*b1 6w uv 6pm*,pat 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 immff 4 cvt4c rb,a+z*u1m:5ovrpedance of 60 W and a resistance of 30 W. What is thv :1fvr*4aucom ,tb5m4c+ zrfe 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 circ;):*ol( 2s- spol0rahrfg. y3ndfl s kuit containing a 50-W resistor, a 10-mF capacitor, and a 0kan 3*p f( -h2s. ;flso)rlyo0:d rlgs.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a )1rdjj *jnkz7 w2p:ll0s h+ s,ji+sknlp)yo( 15-mH coil in series?0lnj ))h jj +1p+ k( r*zyjkn27s:,idwlp osls

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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 serieslf9 m b8pqode-ge9 z2- with a 4.7-mF capacitor for a resonant frequency of bq 2pg-8oez-m 9f9dle10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in seriesliqe w*is71sm+r . u+o with a 3.7-mH inductor for a resonant frequency of 100+ mr1ouslii7s*+. qwe0 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 placj ii/hmt*)qo/c*m 0 lbed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1m/j*cbi lhio/tm* )0 q000 Hz?

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