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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 ex/qejmh1 l)a9we2h f, t4(-av5a 5 a wkftu6rlqcept

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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 tj*hjw-0eg:u y.ruouuy1s63 that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coif6 vl2ab 3 ;xutfjg( t-;vs.4pr *ycgel produces what kind of change on the ind2 -.(* f t4tsfgarvpgju;6y;vl x3 cbeuced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces whatvko: emvqa/ +auo0 y5uz0h(,n kind of change on the induced 0m, u y0n:voe/uaakv +hoz5(q$emf$, 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 produ7, camr2b 8zczv58uzb ces what kind of change on the induce b 7,bzmvca zr2c88u5zd $emf$, 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 fiel5ya gw;nb 56 uxaawo7v8jlg+3d 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 directio:j)2z yd bw57jjbj 4sun of an induced current in a conductor will be that w4dwbsjzjb52jjy :) 7u hich 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 hel9xt/zwu5xbfimg+b(ekh 1 +8j d above its center with itsb/ t z (e+x15iwb8mj9u+gxkfh north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table.yfja 3tpt4n2 ;udv3c7 A bar magnet is held above its cent4p acvyj 3tnfd7;u32 ter 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 ta fw.4uhuxcn8;jm3 n() xugwn )ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is tgn8xn;w3uw)( c) n4mjxu. hfu he 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 lev6ey9a7bu f+: jfepi9.g obq1cel table top in a region where the magnetic field vector points straight up. Th 9o.f :f1a69cqug j e7bpbi+eye magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizxf 1ued(9: nqxontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field dis9:due fn(xx1qappears?

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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 txi+feh3t+pq xbjr,3 d7( ok/ rable and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Whhp 3xb+ rfjod(7,r+3iqt /ex ken viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering0u2yf,h *k( z j2qtwfb first. As the north pole enters the wire, the induced current will be (as viewed from hj,qu0fw bkt 2y z*f(2above)

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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 v07zyo.96jbrl*scrh 7 isn:o rotated 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 orienta ir o7js06:zcrh nly ob7.s9v*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 rotatjp ,nq,u:* srsed at constant angular speed about an axis whose direction can be varied. Ir:j,* un pss,qn 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.sdbbl 6q,0 (+q jgzb
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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 a9sqzd.n3y x r17p6olgn $emf$ 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 ma6s x6: lmrs7.2eill aqgnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directiond e5(9yabv.w hxzh r.7.;fbw n) is moved northward at constant velocity f e;h(rvw7h 5 xwb.9z ny.bd.athrough 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 rotates at a constant angularwt .acszk1g 64 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 trans aqxk2 s p)*r5w- rv2/je9j2ldjuh;tjforms

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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 eachrdt 2nw-u 3h7g second. The frequency of tt-grduw3 n2 7hhe $emf$ 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 c58pijm * sq( :bj-lvqfq-e(i 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 th/ m0shha: y*xd7:2xzaqjcd.j3bwji4 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 cn2 ;s.wjeqo 7zoil then 2.njsz7w;e oq 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 primar1gi/::qba ttuy coil contains more loops than the secondary coil tb1utt q: :/aighen 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 power inpu-6zky(rl+0ioko3.d; f -cqqz p :dh lgt

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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 1lwpns5sr m8)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 i kuphrb+gl whnm5*1 phhn dl,/(963thn series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across (hkrg+639/phm,udl *plh nhn wh b1t5the 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 ar2i7he(yra q 7w lb1 q9ywp 58hypwv;l)e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thh;wp)l7rh5p 1vi(q9la b28ywye7 yw qe 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 witj:o(w. ,oiuz fh.b0lgh 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 wyh(6 9w o*0brh2aisnpith 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 bao;eg,p mln0qa(k* j.httery. The time constant for the c0mp,*o j(gl e;ak. hnqircuit 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.vd9i r)iy5+ t1kj fky series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the tir kyt 1)9j5yv.kfi di+me 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 exceeu+bw 9vv4vm 6pt:

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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 circ+sg.v32ouqmj3vyw hip8, u)auit, 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. Isf6 cknd/br 0t vshh c-/2d2,;kcvi;fn this circuit, the curren 2;/-0sv2sbf/k ;i nr,d6hdcvkcc htft

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factw; cld *a:gktk /;pbi0or when the frequency is triplpd;kwb;lci :tg ak/ 0*ed?

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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 induc9.+i j5f(ph8s wewbg ative reactance of that inductea h8giw.j b 5fpw+(9sor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor apprirgwt: ( 2 sr8u/0we5zqpg1:rbq bqp -oaches zero, the inductive reactancr:pq05 s -ue8z/rwiw bgb t:p(1q2 rgqe 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. Innt v r)v96bi9j this circuit, the currer9jti )96vnv bnt

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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 chan9h.s);:atwas urc b/ jges by what factor when the frequency is triple )ja;ubct rh/9w.:sasd?

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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 q snpyse)sa+kb9r53 +a capacitor approaches zero, the capacitive reactance s5yq sa)39pnkb +sr +eof that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and c( p hii8wqs8 qrt*9g8l br 1gr4m4cdv6apacitor in a RLvrgbp* 4hc 49ir(6q ml s88qr81tdwi gC series 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 defia-w(xk()mqsyqb xm/ ,ned 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 increases if R incl w* 9rfs:yuq3reases. Whluqs9 f3*y w:ren 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 circu +diplac+m5iil 4yoqfu, t463it. 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. The01 rxgzbpv a86 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 w9s ++ow al*wo4h.veethe capacitance both double in an LRC series circuit, the resonant frequency of that circuit wi4laww.eo9ew ov+h s*+ll

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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 apgbbb8 po 7i7i fcgf /tan+*8i5wb(q8eplied 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 (c4x4 u b/rr,bztpzf;0dat5jcircuit 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 uniform magnetic field of 0.2ou8g,h77,b pymh kh5 6vtor w40 T. Find the magnetic flux 7h7bhg myvr oh t,p5,4o8ku 6wthrough the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.r-rgg l9h ;j yv-o(*cz*bukt520 T. Find the magnetic flux through the loop w z **yj9tkl-c5( -rb;hu orggvhen 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 i4x:0 xou vfj3lrqb:4ss rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whulvfxx0 j s:qb:o 434ren 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 areau :li hqq98vs0+13x lyosd-q(vci5ta of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coilwgpmj*o ar846 )h x4lh 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 /g9z)m+v 3h+jk f duteof wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to k)jm + zge+93h udt/fvthe 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 wi(o0xa l 48sshv w h8a-9aaixbbg2 3kwig:4 5qkth 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and a:mp+myjb/e. qjdw+cg) u94 wjrea $0.20 \; m^{2}$ 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+eto/ v+v5dgzk8p2 lv span of 60 m flies horizontally at a location where the downvpv8 v+de5g+2/l ktzoward component 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 6/rsv8sd4 ieaa constant angular velocity of 2.0 rad/s about a vertical axis through one os ae/d i4v68rsf 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-sectip;o1vm q3(xpe 7tcq0sonal area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns q*8yr99gcc5 vxf7zoiof 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 rectangulacc qfp eh2+obqm(v- ynwxu5a341(a3ar loops 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 the maximum output v3a-om b3q (aya eunc 5+pvcw 1qhf42(xoltage 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 rza:n hm ixe5 w:7jr(apn*gs i.n:)8l 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 simpleoqs*hs;q(c e :rzo s,( AC generator with an output of 12 V maximum when rotated at 60 Hz.eqr:s;h( *, zsco(so q A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a ge) 4.y2g o ml3agjzt;l:2 vouhznerator 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)vh* b:gpe3lz have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor3ux6v wfcgzg(6 0e.u- wlixvo7b:y:y have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at gwov(7f3 :ei:x-6. u c 0glwyvux 6ybzfull 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 con2dmgi+w,jrkmc8c 7y 0nected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currentcw8di2c ,m gm07yrk+ j?

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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 resistabxrz lgbqhv /u *nu0n3w1u1j:z:b8)ynce 6.0 W is connected to a 24-V power supply. The operatigw)j l::/ zv 1hu3qzubn8 *1yr0bxnubng 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 internal resistance 6.0 W is n qf*0 yquw* ss-7+ickd/a:r* wag g(bconnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the+ cgwdfwiqg*a :- k*br0qnu7 s(s ya/* back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltnro(lf4.,6 uxjf 0v/mzmee 1zage 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 offgi/6p( - pspy a transformer causes 14 A to flow in the secondary. How many turns are in the sep -g(/ify 6pspcondary?

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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 tur4ialfx7(2 ffxns are necessary in a 110-V primary if the 24-V secondary has 100 turns?a xf(l4f7f i2x

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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 as9n0;1)ep j k ih5 is1azewa1u 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primwhs ;1nei9a 0 1kp)euzjias5 1ary?

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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% efficij 6 :ouo:i0zvw w4yn+jency, how many:oz uwjw nj4:o0vi+6y 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 neon sign transformer provides zxfq ;9b/i,nx7500 V at 10.0 mA. The primary coil operates9b/izqfnx ;, x 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 4a7j z(uekz(rvy3 6 e;,dpeha 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what yuea vea73jep( k hdr,4z;(z6 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 transformer80e7/ekwv q * aqt5jea has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarej5a7q /weeqak0 *t8vy, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Ilr l9z./i* f8v)u zcwjau 8dd(f the input current at the .l(d8j8 ac)ufzri9dwlu z/ *v 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 secondarh6jn b-7gk(oxy has 200 turns. If xb k-(g6jhn o7the 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 turns sif5 jj x(t-v3u6yw:t. If the power input to the primary is 100 W, we can expect the power output 5v6:yw isf3t-jxjtu (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 s/axl;z;u .7lkzagj ;gcfn- ar 2foj: -n;i3bstepped 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.2j zjgfu:;scx - r;a3n o7zg /nilkl-;;fbaa 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 1i2ptpf;6t mi /20 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 po/pmt 2fipti;6 wer 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 61 5 ctmtwl6.n2f5grf8uv n1m -amigk)0 A of current 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 percentau - 6mat1 55trwvkngfgn1l m 8c2)f.mige 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 uqs 6luki) 8i+line 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 transformersk+i lu6qu8 i) 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 line 50 km long has a total resistance of*zj +w , )nwm9v/yg7ij.*slrcf goe8x 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost wz/+y) e*wlsni78mo .c9jw gf v ,r*jxghen 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. Ho -xg(zddcx28v4l cer h(* 4mumw much less power would be lost if the power were transmitted at 3000 V i4-xhmg8xmc( rl4cv(*d d uz 2enstead 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 gener8 9w3 w5 :vwnh xezzn0mw2yxf,ator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. Toy8w 2f5m09hz xze w, wn:x3wvn 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.tnsmgszuycp+s6 zy+yi1 ;(8lsm;a :4 How much energy is stored in the coil's manyc+ y1+plt;zuz6(;sg ayi8sm:4ss mgnetic 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 6.0ri:xmr* :8hrt :6awsirs* ub1-W resistor and an 18-H inductor. What is this circuitis6ri r:ax1**wmtb8 ru rs:h:'s time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wheri ar0vmo7 x7o;e 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. What is the peak n++lv6nc er zfcxt:9ng x *6s8current?

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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 b)dp/ u:ij zaq.3d- gd d)8iksthe lamp b)dd/ gsudqai jzk.i:p- )83d?

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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. g4 e4no+. cqzf What is the peak current through n+fe .z44cog qthe 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. What 55/5 ctp1me*alc ij pkis the power dissipateplt m c55e/ja 1*k5icpd in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through * v*qpvn4vmlj 2na)y 2a 50-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 7 ha gnub:1a;*qm.)s;vjfs;rpz1va m 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 resisto ve cn 6we3k3*n0py: 3xbeg 8e;6xhjpjr is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 6al 7l85:veg5yfkcx7 5z tj5f c 9ah.it0 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-m ed33l p*mg5jyr s6:v57xhn vxzb :ak/H 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 14.0 W of inductive reacha6t0pk cu4z pz3k.8kfn; k2jp; ms4ztance?

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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 reactancegel p*52.e i e)lmfz2b 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 k4. 4-hx7ewrk.uoet vz Hz is r4.ut zee7o.xw hk-v 4applied 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 110-V, 60.v l;ci,bagygv272/hz u -jj t40 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 ml.ot lu1qzs+2,gos 4kHz?

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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 r uzf8 tzql98xyek++y7eactance 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 does6n.c3m qan 6xy a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactanx 2d3zsipa6drd )o;0thpu(n 4ce of a 0.010-mF capacitor be 100 W?)ud 0s4ah( dd6xt 2n;3 ipoprz

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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.y bz n3y-jxv4g4s0i9y 5m gjy;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. k54tf-fs 6ven0 W resistance, 15.0 W inductive react6ktv e-nfsf5 4ance, 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 resistor, 20-mH;g b+nj ,y *ageo6ahj9 coil, and 1.0-mF capahoye+jaa6,9g*n ;bj g citor 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 atvqo:j4u y7bd1 tpz2:k 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are codj2uby:p4 qz1k :ov 7tnnected 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 ilg *- 5cimy9xakvy+ r-n series with a 20-mH inductor, what is the imm -+ k9y x-ary5cvl*igpedance 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 serhb51y+n u 3+pfbd 5e4fjfb j36dtkk y/dv/ h+xies with a 20-mH inductor, what is the phase angle at 1000 Hz?x+efkybf/j+yj3+ 3h dvn 5 bh 4 fd6k1upb5t/d

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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 1.0-mFx*w,cr ;msyqhd)5 923kc8wdmk j xm+ y capacitor for a total imwkymd3r+d ywq sm)h*5c 9;xx, 2mk cj8pedance 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 1olk 5 f6nj;q5q00-W resistor and 15-mH coi oklj 5f65n;qql 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 series with a 450-mH inductor*8 j g8gs.xr44l8* gcdd grbfk at 5000 Hz for a total imped. *48b r*ck xd8dlf4jgg 8ggsrance 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 in series with a 100-kW resit;)is5 a3,ue ejczjj(stor at 1.0-MHz for a total impedance of(cesj3, utzjj;ai5 )e 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What isk k9f.o7g- qmw the impedance at 100m7-wq9ok k. gf0 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 need v - 0u:dhbz3uusb)l7-jxp*fwed in series with a 10-mF capacitor at 1.0 kHz for a total impeda w03* h-)- uvpjfld:7 zbuusbxnce 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 kHz for s( .o*jg/+mp.fprva wa phase angle of ( pafrs.+op*vmg/j w. $40^{\circ}$?

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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 resisyxhu)fbscb f0j4gs+ :s (p3 s(tor at 1.0 kHz for a total 3g0)(sb4 hujs(xpsf: by+csfimpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor 3/-nfo fp;qy jat 120 Hz. What is the phase angle?-y3j/q;f nof p

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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 Hz8xmv. iyy+7 ok czgq., if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor+7ix,ykcqzy.m .g8 ov are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0y2n+4qj6 gxfp ,5le a z:mf;ra.350-H inductor. The circuit is connectedlxfj2eyz far 65a;gnm4 :,+qp 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 W379mkswnfd)f , a capacitor of capacitive reactance 30 W, and an inductor of inductive reak73df s) fw9mnctance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle fo(dx.i fe w6z;d:qzaf. r a series RLC circuit containing a 50-W resistor, a 10-mF e. iq;z(f xdz f:d6.awcapacitor, 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 resistzcmq)vn .5 sga*04p jyor for a phase angle of ncam )z4vpyq0*5jg.s$40^{\circ}$ 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 = 27a 0fdr(92;a (oo odswyt.bdr00-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transfwaa(s0bforr7 odd; 29( od.yterred 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 c80pb/ +r.e v1i c +b6agsifwvwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac epiccb+ vf.a8v+6g 0i1/srwbitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitx:rdgjj rvxw.ygzs m9.;vrn1 p3 s95- 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 fj;2 pst(g(/;y wvmq e30 W. What is the power fe(;(pg/qmsw y2 j fv;tactor?

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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 RLCccww(gp*h hl,mb5ls g jwx9bj5 6 a(sj9c)4s3 circuit containing a 50-W resistor, a 10-mF capacw* 96slb3ghcmwcws,4psa5h j( (j gjxcb )9l5itor, and a 0.45-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 15-mkpresc d6(.4a5)r g;0 xkdylkH coil in series?pc s)d06;k.arged(5 yk 4rlx k

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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 ca2 3xk fz*y) f2jo4j mo6.o ppyyx5n;depacitor for a resonant frequency of 10 yn6 ox25fojp2*x3y4fzmjd k p;.ey )okHz?

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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 inductor1 dcsgxveu.f6ae7i5( for a resonant frequency ae7fg6.sudic(1evx5 of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be plac 9(jfirt:wxm8ed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cirtr8( ixwf 9:jmcuit is to be 1000 Hz?

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