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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: 游客未登录  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 except7/egz d*5xter 8v +trp

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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 tmdmtgeek4 :k+m6oq l9eqkzf: ;0,*s xhat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of b-ns/cslrb 1;ne +b04 otzn +ychange on the inner;l+- 1nt4so/s+b nbc z0byduced $emf$, 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 -f go6y d5q0etproduces what kind of changg0d5 q6oe-fty e 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 kin:x c 20c 0u*uc4ydk g cv;jmebmvt4,-gd of change on the inducc b; vm*vc4,yjmue0kc42g:gxc0 t-ud ed $emf$, 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 magneti bg89 * ,clqiran.ze/oj/5ggec field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current iob1zf 4xp(r/on a conductor will be that which tends to produce which of the following eff o1bp/z4o frx(ects?

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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 on75v*pbk kl7eb y g-8er a horizontal table. A bar magnet is held above its center with its north polekk b y7lv7eg-rp8 *be5 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. A bar magnet is held qe( /fa8d5r fuabove its c/eqr d5u(f 8faenter with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a r.3 vy9mgf j w8znd1l:gegion 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 in jyw :1ldg3n v8. zfm9gthis 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 wh (nl3lq0jxvj8ere the magnetic field vector points straight up. nvq0llj ( x38jThe 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 horizontal table top in a region where the magnetic fiel,4forjs5uhy /9eyra ; d points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currsh frujo,/5a9 ; 4yyerent 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 a*6pr-3oq-z5yr qw(/za4 xgbi.lannm nd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current cmrgy35(xqra q.- zn/l wnoa* 6 4-bizpircles

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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 northkb gr1zwg/ v/xr/(fdcp4jg7z 4 x+5zo pole entering first. As the north pole enters the wire, the ind5/r (zk pzc1gwz drvg/f74 +xo /xb4jguced 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 w )/4f- yaedmq7-of mjangular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, q)y-da m4f j7w -fem/owhat 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 l ;)dch qfxn2(gmfjfdy .8j *3is 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 orientation of the lo;)8 yjdmf3x2fq d(h.g j*cfln op'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. 1meh5/8dgj3 embcb y7
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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 an kq/ukxcc +m1 jw0k4j yg.b32j $emf$ 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. h +56y;sgpba e/g gku3 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 eapfgk-lbie (c255 6rqu st-west direction) is moved northward at constant veu2 pc56rb- li5(gqf kelocity through 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 cojq3rbw5 c ;o:d2+ b oc5temy5bnstant 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 transfr,mtu 31bv2 0jue skmd ;ja -atpz;(e0orms

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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 revolu3+;r.-ish h caiuxu+ztions each second. The frequency of the ci3hz+hiu+;. su rax-$emf$ 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 dep/hr/u9w/ wf xa-ih.cvice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devii(x-yv lj 9,;kxke7n t8nbjo5ce 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 secondgzmi 7p .r86jrkdb/k -ary coil contains more loops than the primary coil then k8rjigp . z67-mbkdr/ 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 cwxfm(:;;vd e- lz;wrbontains more loops than the secondary coil b l;d(mvwr-ew:f; xz; then 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 inb k4ln)1 ocn47q1u*r6wux3gaf wvif1 put

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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 cir 8dqf77srlfo 4cuit,

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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 idvy;h :0rkvr/a eal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage a: r0h;yarkv v/cross 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*pwv(b 3j;oc t series to an ideal battery of constant terminal voltage. At to t(jb*pw3cv ;he moment contact is made 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 inductance L and resistance R is connected tokel 3d:;hz9ppl:0rsxs*g )qs 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 resista z:i4ct1n-ggqnce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time cs5gd- (4)6ss4tjgcfccib z. konstant for the circ4)c6i kgstsg54 s-jcd.bc( zf uit 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 seriea 6+ci +d5jkecf)*8l.)rt+ pg+ x +g augofrmss to a battery. The battery is suddenly remov+k )mcjtdc 8lrgia+o x+*g5r6uff +esg+a p .)ed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following hw66n4k2*hg xv+lawdaave the same 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. On t0:-gnm 0kmf 4hbf0wjahis 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, pav,4p 8q:kz tthe currenpa,4p8t: vk zqt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when th8 n w9)k*sa2s u(ltskc+(7 b(s jjlbape frequency is tripledk2 8ssak cb(( st (pawl7+jbnsjlu*) 9?

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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 indf ;*s9hqf6e efne+0tructor is doubled, the inductive reactance of tha;eefr6fh + et*fs9qn0t inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an ikjiguv pjj ;natxj-4x+w+0+4 nductor approaches zero, the inductinvuxt 0;xjp+wijg j+4 +-j4a kve 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 circuit,b mgg b96vrhkj8w741p the curreg6h 1b8r4gbw 9pjk7v mnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance mfmk t1s+k:qs 8yc0 1rin an ac circuit changes by what factor when the frequencq+ 01 ckkm1sm8tsrfy:y 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 volgg hd/o (iwt,:l eun-+i2fb1ptage across a capacitor approaches zero, the capacitive reactance of that capacitogio2ehu nl1 wt(pg:f-bd+i /, r

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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 oq7frz91n( o4ege4 kt vf the inductor and capacitor in a RLC series circuit?rq4o9vz7 k1enf 4(gte

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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 circuitv :dox08whf0gqr ;yq 2 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. g :5t6o g darvm:5publ2t he(v9 )q+x/x ;pqtsThe impedance of the circuit increases if R increases.ex+ :rb/5pox5q sg tut(dlt;9g a:v2pmh6q)v 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 lk7ys6*ol5a;aq 8s2).-cdyci vys b kthe circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cijaum-lq e0/r5z2 y r fgm k9b/4 k-e4od+gxbq3rcuit 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 double in an LRC series circuit, thee 8wlhtl ;0sb2 resonant frequency of that 80s t;2b ehlwlcircuit 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 resonaoh/t yb qy;0s-s drzy(yjov4+amt1 *k8.;isnnce,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serie.8jt ktnqncyr swp 4f 9ph2+83s 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 rotatinwoe,u qu 3rjdu r72:o.tuo /k8g in a uniform magnetic field of 0.20 T. u,uooq.:reu3r 8 tk2d /7w ujoFind the magnetic flux through 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 uniu,h c . ln*2azjqym/7aform magnetic field of 0.20 nlj* a7yzhqma c.,2u/T. Find the magnetic 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 0wt8vcys 5s-sm xty)1k8-lfw 5.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic ffmk5-yw wy15 xls st8s)8v- ctield 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 cta pkt7l dqmv..- h9 do:13jgsingle 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 changecyzeyot *n0 j 7*m(7w0 ptadw2s 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 q-r(mr) izfb6l(rkd) 7d27me a 3k lydof wire on a square frame with sides 18 cm. A uniform mag m7-rdzlk6yfd3re() 7m r2 b( k)qdlianetic 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 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 witdlq(l5xpm(br. md9 v.zx,g3zh 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 andk ehu,aw(:: dz 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 horizontaligxoc8r,ws22 ly at a location where the downward component of the Earw2 iscorx, g82th'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 angular velocit6e njemb1+(igmtg36ven5cmw h ,t*8m y of 2.0 rad/s about a vertical axis through one of its ee1e 5m3mt(gnh e icwjb mmt,n6+g*v86nds 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-sectionazp clh(3v.p-k l 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 consi,a9l,joha rx:o)x3m v uo62pgsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armn1 ufi/ ot636rz:jsgt h2hgu0ature. 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 axisgi16f u h6t3r20: ngu j/sozht 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 wr1ndiv(2ynk rc/9 5,t 8ttl wjire 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 vv686a 0g*s anzc8kjzconstruct a simple 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 cv zans 8kc66z*j08avgoil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximm4alds /n)td ;*sk gi;um $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motorpr* *i/c 3d-k fdllq*ryb r u4.az6t8c 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. r q g0+:trolbf a*;b;6t1irqr The motor operates on 120 V AC, and when running at full speed it generatebrrfr1t;*tg i6+ l0q aqobr ;:s 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 resista0r pk1vo0pv8 v03jcar nce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is tpjr800v1v ok 3c0vpa rhe 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 20/q2cjap9s xdrev yb7w0 qv:84-V power supply. The operating current is 1.0 A aa8 w9q /00b rqypxcjd:s7 vve2t 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 connected to a 24-V power supply.amh:p0qg.7pzbcj(e . The op0eh:qpagm . p. cj(zb7erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to redua.76u3hgo i)8r y 3 vl5zvpjtf-duwx ,ce 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 transform x4 9r2c ufraqtk9w oxv4)3c,qer causes 14 A to flow in the secondary. xucvq2kr99orq4 ta c34, fwx)How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primaryd:pbl *fjm;iq5aukjaze9 97; if the 24-V secondam99l q5djb7aeu;:j;fza *ikp ry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coiso-1l u5ub xk8sy6mkg ,f9lo*l and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the lfs1k58xyosu l guk*b-m69o ,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. Asl:g y 2xxj,2yvsuming 100% efficiency, how ma, 2:jyxxv2gylny 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 :,o tkw r4aexh axnhk; .;:-qybia-l,neon sign transformer provides 7500 V at 10.0 mA. The primary cox ro ,w:h-:iy . tkh-lqxenab4;ka,;a il operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its se *t7t0yb as)p /ndqj2acondary coil. If 120 V at 2.0 A is ayt/njb7*0d pt )sq2a applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnr gf-3pko9 n8zs on its secondary coilrpngfz-8k o3 9. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Iv7f 5+7pz(yij9j gil,lcms/if the input current at the primary is 100 A, we can si/vl(95l 7 mgcpyijzjf,7i+expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hapn6:qgl+n -c1p c2o khs 200 turns. If the input volql: chkpocnng2+1p- 6tage 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 20 vlo.y qdk,on0cwtf/j1-3t7 c 0 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be1c/o jkqow07.3f, dl tntvc-y (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 l0+-mfy 6b1an*fvrtbk5 pa;l. 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 number of turns in t1af-l5bn+*vrk 6l0fb ma p; ythe 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 5n*-s.qk+eeu/jx ws:b 16 . szcrmlp vat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a po kxj*qwzc .lss e /eb:5s16+m r-pvnu.wer 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 usual nkff cp dh.5t94)psf+/ wkot4ly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 Wk5f.w4t9) +kcofp sfn4d/t ph. 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 um r-y0mnszt7 8cpw.kr21g5ktotal 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 k7 s rzg0tnu2k8.m-rym5cp 1w100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60jmdiwc*2qm2 9 aes00e W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the vo 2msam*0ei9wjd2ec 0qltage 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. How much less power w 3ex tggfgcx76f-5l; bould be lost ;7geglcxf5g3x b -t6f 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 k5y6phd:zmo, a od8vu; g64 fkV at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what vo6dgu: o mpvo,zak8 ;5hdkfy4 6ltage 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 5.0fs *2si3x nlr9 A. How much energy is stored in the coil's magnetic rsn fil2s39*xfield?

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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 ind7tlcc -w 08pry)2w7cg. 0v4 qiuudk vguctor. What is this circuw c-7vvukcgd04 l7c8) g0r2yqt wpi.u it'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 9,tl0nld 9*ky7gnb utcircuit 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-ru6 m0 w*xbkk/v(k5roV 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 ACxlhy-7fp 6w3)b7 6r vied;vyb outlet. What is the resistance of the larhi3776- vx bfb6) ;vy ypwldemp?

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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. dyj asfdx:bw e88 9z7)What is the peak current through thez )b:ds878w9j eaxfyd 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 is t z9fv(sw+ hlcf6/k r0nhe power diss0frn shz+v(kw9cl /f6 ipated 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 a 5ns*xc(rzqkzr5a:w7 .1pcje1 0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 5ob8fxl4 r qx1is $I = 0.80 \sin (240 t)$. 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 re a*g8 jwzznm lb28-2lkbjyr5,sistor 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 reactancep 7 ph-d-u;pvrb fg8:7es.eay of a 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-my+tp, lh(yar1H 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 mu z e0l*sj1 901dbolu14.0 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 of inductive rezuu o 3sn-ub6c,n1v3k/b vft1actance 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 03y0d.qn cyu/ k4ac489fwz*zcdwzhc inductor when 120 V AC at a frequency of 20 kHz is applied to it?y3c9 h adznzw00 zdcw8*cfu4.qck /4 y

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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, 60.0 Hz.fq5/t ( y kmxfcp,5rs 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 capacitqan:+q) cb l s)yth2l5or 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 isbgt1ph/6uc- l-8f6ob+ bj-fgo n kbo- needed 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 capacitor hatwp4ciq b,k /7fi05irve 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+:q g sewwr.1gj:*glf reactance of a 0.010-mF capacitor be 100 Ww*fq.+g:1srl:w ge gj ?

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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 0.2ltsh ulwq+/xdo-lgo 2 504lp0010-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, 15.05:gado6 ik,s .6clyih.ba: ij W inductive reactance, and 10.0 W capacitive reactance :aas6:iyhg,lbkj.iio. 5cd6 ?

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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 impedaun + : wb1:7+pjonfb; pk:lfnbnce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connbbnfn:p b+k wu;nj71+: :fplo ected 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 coil6ys d7f y9bd*cb )yefxfjbo*qc2m )- nt3n,(m, and 1.0-mF capacitor are connecte7ec db t *m(2nx6dm)fyjbq cf n osyf*3b9-y),d in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is *iq1bv+ 9gflb the impedance at 1000*1 +9lbi vfqgb 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 ss6b4v-) l u*guam8ihhfv m3 lb((v,bd eries with a 20-mH inductor, what is the phase 8hi)l*ufhb(l 6 m vbmv,4v-a (ugb3ds angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mFkitkep)9end33 f9wqj+/ w m4l capacitor9wdml33 njp +)ki eefqk9tw/4 for a total impedance 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 capacitksfp:sem+:0vzeq gph55v9lc( g 7zp )ances is needed in series with a 100-W resistor and 15-mH coil to get a total (p)v5elcpgzh5:7 f9zq0gk+smvpe :s 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 at 5000 Hz84da5zpmuj p) for a total impedance of 40000 W)5z p4 pjd8aum?

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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 resi,+ a.jroraw-nstor at 1.0-MHz for a tor,a-aor .w nj+tal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-z s+v71b,kxzd x g8bg7mF capacitor. What is the impedancdx +7sbkgz7bxg, 8 1vze at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for b1d0bu ,*n5ca 2qh2xsvq-b lca totalbbc1a, qv 2bhnxqd*s-5ucl02 impedance 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 /tp t,w5fg)pv.0 kHz for a phast5g /pfp ,wt)ve angle 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 zwma3 +nxgv g2pnfz: z47(-vqd.pe - s30-W resistor at 1.0 kHz for a total impedance ofz z:m7 w-2n 4pqv+egaz(f.p-3dns gvx 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 n5 31 opqp, 9x9sgmieza9v( bp100-mF capacitor at 120 Hz. What is the phase angle?s,va pipn9o 3b5(9xz 1 g9pmeq

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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 a9f);qb(jy q,y4r: jm;ak3r 5- aazwwj slud -v 100-W resistor, 20-mH coil, and 1.0-mF capacitor ;f;yz:a-rmdqr3-(alvkj a ujs9q),yw 5 w jb 4are 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 resisth2u3q k0k/ af,fbai0gor, a 10.0-mF capacitor, and a 0.350-H inductoi u 0f,a0f3gbq 2hk/kar. 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, and ,c.w-k;d m8ua 8ojimman inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. d8u8cmk mwm; ,i.j o-aWhat current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit con5wu*cu m ;d4bktaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplyu54k*c wmdb; u?

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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 phas0p,iv-xje1o k e angle of-oiep1 k jv,0x $40^{\circ}$ 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 = 10.0qyy1 * 2p/zacmxugi 9x0 k7lc8 mF. At what frequency should the circuit be driven in order to have m98 u*k/7 lzx21 qc0ymcayig xpaximum 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 w)ohd 1nw)c2v0e 8l gn aoj/6mcith 12.0 W resistance, 15.0 W 0ew261ndl aov8h)mgo)c /ncj inductive reactance, and 10.0 W capacitive 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 circuit */d qtjl5.k e ;/ikf;t3r i*teow5li yis $63^{\circ}$. 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 rew;)ev;77 c4xf3qz j arz n+pug3v,jsxsistance of 30 W. What is the,vr7 xsvxjn ugw;e;jqz7c4 apf 3 +3z) power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing ao tg lob;;/(eek )l8qp 50-W resistor, a 10-mF capacitor, an 8bpgl(o/)qe;lek;o t d 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-mH coil in sercp96x1q :ibjo zv0s k;ies?;osc: x9qp0zbkj61v i

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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 fo;sk2:vnqknx0 4l 9q)e+vgciklzd *(or a resonant frequency of) xkl kis2 +olnvg0;nq(cq:*d vz94ke 10 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 series with a 3.7-mH inductov7shsroi +5;f r for a resonant frequency of 10005 ssrf+h ;i7vo Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-m.xg i/ p(35vjeie*kkqH coil if the k/qikip.*eej 5 3vxg(resonant frequency of the circuit is to be 1000 Hz?

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