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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 w2 u ;s83ee2n*xp.t mm9uqnxzunits of 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 that71 quk uw*lkm( 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 pro1l vierb 5,y4g+ar8rmduces what kind of change on t,l8 m4+yvbe5rra gi1rhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces w y p6shk46 t4+i-yoebf xgsa:5hat kind of change on ths:6fi5oay6 +gxhek b4pt-4y se 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 of change o0*)5pwugd -mpx ps(j8wnb mx2 n the inducew( xp*nj8dxg s 0)5bu mw-pm2pd $emf$, 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 (4ic2*.5io/vq;m vvb tfz czf 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 ops13j:fncns:5fj xu hk. m .m9)cq 4mtf an induced current in a conductor will be that wh j4k :m)np 5x9.csfqsu.hf3:c 1 mjtnmich 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 *x ua:xdnwde4 ,ic69o. A bar magnet is held above its center,69axw4ucexd:o*d i n with its 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. A bar magn uml 1.9n3tzmgt8y u;net is held above its center with its north pole pointing down, and released. As it approachz.nym3n1 tml9u t8;ug es 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 regusgb5( 7 bqqwhoq77; uion where the magnetic field vector points straight up. The magnetic field vbqqbhgquo7 75 swu;7(anishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table tb 9ym4y 2stsv;op in a region where the magnetic field vector points st4; sv bymsy9t2raight up. The 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 the5jve1 k0u lf,t.mm)bn magnetic field points straight down. The magnetic field10 lnm)e b,v.kjm 5utf disappears 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 horizontal table and carries an ever-inc+/0 vmcjfc3dzreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducc+fv0 jzm/3cd ed 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 witojn 2e k8msx( z;s +-v)aoblf)h the north pole entering first. As the north pole enters the wire, the in;mk)oenasz lf o)b +2xs(v 8j-duced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoy t+ng z dkldr1/de/x94:bh n(se direction can be varied. In a region where a uniform magnetic fi(4 ndyex +:/9 k/n lhzg1dtbrdeld points straight down, what 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 constant angular speed about an axis w;p r1j2k ajvrn9t q-wce4mc*x /n b16those direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axcbv /e1r*tjwj 6c14katqn -;29r n xmpis 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./mjq+:fqnax uu.,u6ef x3 6v o
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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 5qfwl6 s5z dk9ys qj;rd:+lz:$emf$ 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 mk d)ae id)n7x(agnetic 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 directiztj - nvm;t84jon) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concernj 84-jt tmvz;ning 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 angular zlfrbs 38 (n5ni.6ax dvelocity $\omega$ 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 tm lz8)9 5zxykqransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The 6j paifmlsm(3j 8x6 -ufrequency of th6jmmxi 3j6f(la8 us -pe $emf$ 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 us5ui8 c)yw vzx)9ew*uz ed 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/( 6a gojh1nlj:pcc 3zt czw)2 that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coi2z:*ajk x*cpk9:akg tl contains more loops than the primary coil then it is ag*zxa2t 9a:kpj*c k :k

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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 prima4qe q64: a,xzgev kb6p u4prl,ry coil contains more loops than the secondary coil then it q, a eq:x,4bg44k6 rluv6zpp eis 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 imk7e b ;s8w)luix,r cq;m:cvr h t+y76vg3v :enput

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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 circ b/0ra h k ;b8bhkmguz+4-opy1uit,

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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 aree7 ta1sb zoxq9aue,p;*md 80 s connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the dstpaqum z 0*a71;bs9 ,oxee8 resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battfjymj /l9u3 m5ery of constant terminal voltage. At the moment contactl9ymfujm/ 5j3 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 indg/0ja gjyuj +4jrs -ua+oge84uctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with n h*84m*7xu/ zey ;p3 gzqdrg,rt4nhy 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 inji4mx 4lhe7+ace 4* pmductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reac7 pchl4 ema*4i4mx ej+h

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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 arz 6iy2eg8m lj,e connected in series to a battery. The battery is suddenly removed from m gzejl 268y,ithe 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 have the same units except:pj9mx4:zk .o;yi-w22f mnqk w

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the k0k11cwf,cjflpo vo+o5 ka4(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 +f ffgvkrboz+*.o ;pq4v ;cfk iq8x/)to an AC power supply. In this circuit, the currentr;ckq4bfqo/+.vfizvg x) f+o*p; 8kf

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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 j6c+uq7 mk 9odan ac circuit changes by what factor when the frequency is tri76doj+c uk9mqpled?

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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 *ifrft aph4-dg :v;;j wl9 /aean inductor is doubled, the inductive rea;4*wp fja9l /f :ghdvai-et r;ctance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of vup +nf1(h tlo8n91lqthe AC voltage across an inductor approaches zero, the inductive reactance f8l u1nq9p1on+ hltv (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 p pu /eu9f3ep:m5g cv 4p2yvw9fower supply. In this circuit, the currenepg my593puv9w4/ff :p u2evct

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what facsu+sp (r 4ye4 qgp4,pmtor when the frequency im4qssy rp,(e4+ppg4 us 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 across a capacitor approaches zero, the8 poq mr:xj: /0y7ojiy capacitive reactance of that imy q8y: /pojor07:xjcapacitor

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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 voltagd)-en0pvh 0qfes of the inductor and capacitor in a RLnv0 )q0dpe f-hC 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 definedw*z26pr k4zsk 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 circui x.zt x*p2nbkp x;(32+awuazkt. The impedance of the circuit increases if R increases. When is this stz.xa k; *pbnt+w zx2kux(3pa2atement 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 txarwm*ci9w eu 6vq65gu4ss7tkn; 0 9the 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 cik 81nd8ie+dta n/s8y krcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series cir 9k2abfwjrwoh. *im- 6cuit, the resonant frequenowhrb .a ifj2w-m* 96kcy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven jmd, g*ocpg;dg :n.f-by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circua4hmut- gi rsa(yjk1z gc*,*1it 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 unif rfpoa -r,;2ycorm magnetic field of 0.20 T. Find the magnetic flux through the lpofr- ;2,c aryoop 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 unifor w)0. lxwmox.rm magnetic field of 0.20 T. Find the magnetic flux through tw) .0woxlrx m.he 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 rogj:;y fncls,2xx .1nrtating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loo,x.nnrlj cx :1;y2gf sp when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adj+ b0yhql 0zh-justable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fb 68zm dh;mpu2rom $4.0 \times 10^{-5} \; Wb$ 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 w*mw)iqbi -mq8t c:1 -vropbt ;9i:igrire on 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 aver- r::q r;gw) bbcivp1mti9it 8i*oqm-age 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 u.45a wgkhe)u. twvu2 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 ar x7ihsw05ip+:qv s.uxea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where thl/h .f 93 blevdd5/qjte d fqvde/9lb/.j3dt5hlownward 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 rotatehdzs7*.,f3p q pm:sjms at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnef p3qd,ss7 *z .mjmph:tic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of9s04 mpo3ir :ud o9gfg $0.25 \; m^{2}$. 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 68f:i qo ,u7xn)xu/ esa6o6udk49cwtqx u kw6 of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Eac(sumpe+84w ,kl.h7jaqz2g hkk +pd 3mr ps 14jh 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 voltage of this genrlkpq8ds +7z ,h4wjgs1k kue ap2mj+ .3h m(p4erator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire olfkrc3 wpxgbw1 ;e*:,f 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 simple AC generatorg.hh it6l- bs7 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 rotats g-7.h lihtb6ing coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxi97mt)6j4h odpvdbhb b br+*i,mum $emf$ 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.bq t*m7ap ,/a5c,frde 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. a)q1z d:n*kw o g0./z/xdurep The motor operates on 120 V :xag.kdp qw/dzzun0/ero ) * 1AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal r0c dro 3jeh+k3esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current? jrc+d ekh0o33

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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 respq,pmo 9w/,ngle xp.2 istance 6.0 W is connected to a 24-V power supply. Thmppo/.len xp ,2gq,w9e operating 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 connect m05kcce io7e/ed to a 24-V power supply. The operating current is 1om/ e70 ceic5k.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 neede aw;*eh/+y,oaal,kk id to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seccwmmdxo2 ,4ay6b:im0)p6 vc hondary. How many turns are in mhm 24 o d60cpb6a)y, ivxmcw: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 primary if the 24-V 1ugr8h9g8 wz9u hqbx0 secondary 8zgh9gw18ur9u0q xb hhas 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 coil and a 2dy86 ,foxue a5/kd2x p000-turn secondary coil. If the current in the secondary is 3.0 A, whau8o y 25pfe d,/a6xxkdt is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficia6 g: *mvghl knl93cb9ency, how man:lal9*gk c vm9g3n6 hby 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 ne xe tz-huk)/.ca* udp;+eukn9 ()rievon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does th ; auu ce+ez9hk*p ()vi)r-n./utkxde e 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 u: s6 4km2v7dbh .bzfyits primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primakh dubv.6z47yb:sfm 2ry, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sefgxub(3.ha3 fcondary coil. If 120 V at 2.0 A is applied to the primary, whatu3xg(af. fb3h 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 ha n 1dyz2y(56a5lz bxais 200 turns. If the input current at the primary is 100 A, we can expect the output currenty5d ynza61(2xl5bi az 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 secon 1q:eh 0up0 gvfey7c6ndary has 200 turns. If the input vol 70pevgehcn 01:q 6fyutage 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 vxany ,m0ic6*ow(mppf tu d.;ihl36-turns and its secondary has 200 turns. If the power input to the primary is 10i;*6yd-xmfci ( uw03l ha 6vto,.ppnm0 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 7;78zwev juam988 l 0e fipljpvoltage 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 the secondam v89uapj;ew70e88i lzfl7j pry 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 cuq)n95f/ t3dqlz-r -*gls6xd a e4 ewjdrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power leet)dw/sr4d-6 a qg xq3d z-*9ljn5fline 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 5pyx0u ezk0*aV. 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 th k*zauy0xp50ee 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 lohkmv(7xcnk5 -)vrgd.ng 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 gh.nx k(k 7mv-) vd5crstepped 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 line.-cf(e4v8ijmc+s ufm ngza;hat 08gut )8 t4 y 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 percentage of)uzc 8 tf 04tuaisca vm8g+g8yn ;tf(4 m.hej- 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 5 .hp z-xdc2yxte0o-kless power would be lost if the power were transm2kypz5-xect -0 ohdx .itted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is(w3n0waqt9*2:u y t4bz d irns to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator outptq(4 ry9zt:ws nwn0iba* ud 23ut 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 cuda76+jusw; at f h(r,trrent of 5.0 A. How much energy is stored in the coil's magnetic fd,arta6h 7j;uw( stf+ield?

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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 cb pb a-w-t-u2-hyfi- jontains a 6.0-W resistor and an 18-H inductor. What is this circuit's time consth w-b-2ti-b-a -jf uypant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 h;/x h ya,4rdot m;cb77oe0nz 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 placexp0303kp v fznd into a 120-V 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 12(h2v-rpds j v2tm((nd 0-V AC outlet. What is the resistance of the lamp jmp vd2snd(-tv (rh(2?

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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. What is the peak cu;a 8e-o )x kc9h+fqomrsie2-yrrent through the resistoq-fo 8r- )9cesx ik 2;ao+emhyr?

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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 b-+c usgzhsot,it wf 4;t8y1. 7a:fzkthe power dissipated in t1h;gasu 8. cttwizz: of 7tb- k4s,f+yhe resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistossq*7awi* 3uk aq0kgb z.on)5 r 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 resiu bnf52t+vwfale+4 q.stor 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 in9i 6whw+ y-aresistor 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 aye6q8g * ioo*+t v5fl7 f1jytt 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 reactanc;6itceaa, 4/i*ls w ome of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil hadjns l2)a 0w48)o2jc ff t9svave 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 157ybhu.;j 8w(bnzkfu cov 4 31.v W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 8f n48uq09hv d9fmnzo60-mH inductor when 120 V AC at a frequency of 20 kHz is appn894 no8uvm9df 0z fhqlied 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, 60.0 Hz sourc:at-so. iinm1e.25muk kc 2swe?

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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 ;;5pq 5r5ntohl) dixo 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 capacitivz n,ob qkfz9be0ie*6 -e 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 have a reactance of 12001svtv.v ui dz a;x;x;* W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF cav bj+0 ijjraz3+*4:uzrys6h h pacitor be 100 Wiaz0vbyjr*j: zju h+36h+4rs?

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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 5.0 ff,4b zvyc9j3V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit w vj.f8obb(nk3y7q vc:c* za :cith 12.0 W resistance, 15.0 W inductive reactan jk.*c(:3zcvfaby q vo:7 nb8cce, 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 4jc 1f7c(- tkfhf4q aj:p:aqfresistor, 20-mH coil, and 1.0-mF capacitor are connected in series:q a1q f:tfkh7ccp(f4 4jf- ja?

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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 coil, ;apustcfok(3xl0c( 4and 1.0-mF capacitor are connected in 4(ct pkoc;lx s3(a0ufseries?

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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 coxfblb6b)*hr d n144zu1v5 f59 wru lbsnnected in series with a 20-mH inductor, what is the impl9*1 vws)znd 5fbrbf ul1u b4 6xh5rb4edance 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 series with a 2qimej.qmpi 9m-, k:;0 nbejw- 3sgg 0b0-mH inductor, what is the phasigs0g-;qwmj,e:kp9bb 0m e. n- m3qije 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 coc d0er39e h,dail and 1.0-mF capacitr 3,e0ddc9ha eor 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 capacitances is needed in series j 55snty79sd 4: spknxwith a 100-W resistor and 15-mH coil to get a total impedancenxd5p5 47 kns yj:sst9 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 inx)3n57 ja fn9w4 i8+oqncv xn*wg xt.v series with a 450-mH inductor at 5000 Hz for a total impedance of *+wan9ntx qvxcw 83 x4 vn7ni)fg5.jo40000 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 1.0-MHz fb y*z+kiwhkj81m 3 w73dx dzf2.tu7ifor a total impedance of .kz+7f*8d27 3bk 1wimwthudzyxifj3150 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 conn3jbs1xp/loe3 w)alf)ected in series with a 20-mF capacitor. What is the impedanps wefx l/1b3)j3al)o ce 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 huux 8wi66tpcf(7d3p /sw 4jyin series with a 10-mF capacitor at 1.0 kHz for a total iuf c/66 478wy( sjpt3wudipx hmpedance 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 capacito 3,aceo ,0jyes agsf2o6hb*/ar at 1.0 kHz for a phasg ojs e,6eo ,0y a/3sahb2a*fce 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 wi t6r)cdmmj;9c4n- aceth a 30-W resistor at 1.0 kHz for a total impedance of 45 W?r 94;-aj) md6mct ncec

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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 se0 g-s o fsc+pxf8ou--jries with a 100-mF capacitor at 120 Hz. What is the phase -o +-sojg0ufsp8c -xfangle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W vq(t n-bp*6m1nyez4s resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriepq4ytbnnz6se(-1 v m*s?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit conslv+ p4 fbb9kw(sj;.bf ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. 9kpf bb; b.sjw+vf(4lThe 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 capacp82mbb 0 vmx9witor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current b0wv mp2xm98b 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 containing a 50-W resi :1fs67yqwjj(zsf/abstor, a 10-mF capacitor, and a 0.45-H inducto ssyjj (fzb:6 1f7aw/qr, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phasek0 dku/hhe7- d angle of k0dek/uh d7 -h$40^{\circ}$ 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 hf78qjl 7rml z7as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dri7qfz 7l m7rl8jving 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 .x r(w w p;dgyb9 a8ga64gghu6with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, w.6b;ggywg ga 48( wp6raux h9dhen 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 is 69qake onty17xzb-::e: heg( vnae(k $63^{\circ}$. 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 am x:)to2 ne:nqmnr: +an impedance of 60 W and a resistance of 30 W. What isnmtx 2nn ar:moq:e):+ the 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 co mwqu4:,+q bmqntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powerq ,q u:+b4qwmm 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 capac7 rim:g vyl*b)pmj18fjb(yo3itor and a 15-mH coil in series?i8 bmyg3 po j:b)v (l17y*rfjm

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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 ser4izja v.lw 7i7,qc4d50pkgrc ies with a 4.7-mF capacitor for a resonant frequenc57 ga wzk4. pcil,qjcdi7vr4 0y of 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 indp,zk46xhl6+mhb s ;t quctor for a resonant frequency of 100h6qs xztkl+h4p;6, mb0 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-mH czn (cnt 0 :a2gwuyl:jw8,y y;toil t 82 l::,a;wywnt u(nzgy0j cyif the resonant frequency of the circuit is to be 1000 Hz?

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