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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 ofn*ws 6p /njn+d6m u yvazt-v21 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 that- wrfqzb8rc7k 7 er:k8 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 wir0(609x zapx6qjwjd-0or onu i e in a coil produces what kind of change on the inddow-jp0x(z9r0u 6o 6 0xjnaiquced $emf$, 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 ma a.f*z4bqn;f.l zd qkaht +z-2gnetic field through a loop of wire produces what kind of change on the zzf a;dkq .b2. qhtaznl4f* +-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 pr7 tx(m2pwug 5dm k+td(5wh;ddoduces what kind of change on the indu d5wm(dw7t 5(hk;t2x um+dg pdced $emf$, 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 magnet yxvgd6+lsg-y q /76zkic 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 currentg5-hk56f zrja s *sz9.lnid;s in a conductor will be tr .-s9ha l 6djizn*kgz ;s55fshat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bcq/cxd-;7iq lar magnet is held above its center with its north polec/i-7 ;qlqc dx 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 abovz/ukg+ 4j*kj k :j2fws t2 5qq8 tvnk359dfxbue its center with its s5bf+nxfwk:uu9k gqvj2*j5k dt8/ 3 jk4tz q2north 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 region where the magnetic field eo*3jszm ,d v+vector points straight up. The magneteo 3vjms*+z, dic field vanishes 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 tablz974n cwro 0wie top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from ab9zr0w i7o4 cnwove, 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 magnebuh6ro/t;dx5. )f*ugpz.gqb4o:j rntic field points straight dow ;t6uf rg4j5b d*.u g)o/nbhprx.o:zq n. The magnetic field 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-increas/6i m a+qu ar0,n:uwgving current northward. Two coils of wire lie flat on the table, +gq0: ,viarnuau6wm/ one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nor rxwn s5 66b8cbg.;vn*n2t3fesmvce+ th pole entering first. As thcn+bmw3fv6 c*b2r6g; xn8n t .evsse5e north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spl*u0ulb -a mz1eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriu mzua-b1l0 *lentation 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 0gzi+r 5ma 1koabout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation m+aizgr5k o01 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. x+g4bo7h.:( xzxs uti-c: bex feh(7km.f0eg
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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 y9z6p1og )t c- dts-z +xq9q83expmn8un)qiqthat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across kjfpxa):.8g y :i b2kia magnetic 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 direction)csdmk7) t99lg- /lvle is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across thedlms/ etcv)9gk79 ll - 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 anguq 7o0*fx7in-v;o/vk i efs,shlar 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 t cj-tww) pr3qy2*ok )vransforms

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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 nj/h2igf w sz,/ no1p9second. The frequency of the p /ni1f29gjzsn,/o wh$emf$ 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 usedzdv k2hk, 4k a*acs2k k o2hx3ad54/ro 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 devikfdqcg4;:lq s8*4cb2b ab,rpqm /sj.ce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops2v e3+xas 68srtk 6yyo;tno;w than the primary coilok8vs6two+ en rt6 ysy;;x2a 3 then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more looppm(txr-0es lna z891fb cx04ms than the secondary coil then it 4m0-9map(ec xntsl 081fxrzbis a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powe fdan :gjx*kn+*+zej/ r input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circ/cba4iuj ty6q/l( uo .uit,

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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 icq7- zqocrz23h2 fx;m0+5ppqvz5bl xn series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acro 75;zlz2o5rf+-hvxcq p30mcpxb2zq q ss 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 connecte 6hj29zajtw5 id in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the z it26jhwj95ainductor 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 lw8j * lani+p 57kf.iwwith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with ind7arxliq b);y9uctance 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 connecteen8dqtd b6pj q, 2zo3cei*b0+ d in series to a battery. The time constant for the circuit represents thi0 zt2+eb, pdjbd no6qc* 3qe8e 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 seriep i/f4y.uh9)wofp ( dns to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit repoyfu ip(n)./9h4 pfdwresents 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 unitsi;dzz knbkb:((73 qj o 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 sup(+w w)xjaql/k ply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is co6n(iv n6cc ) m8e1op.sm.bmjennected to an AC power supply. In this circuit, the currenpb6c6)noec nims1 e mv j(8m..t

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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 circuitv;3x wc yox 6g8p,b*/2l;s d/ ysmfqjo changes by what factor when the frequency is tripf2;8s vos coqyjx/6bdxwl ;p3gm */,yled?

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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 anjps 4w e*by)*8 sp5rhkc6rp z4 inductor is doubled, the inductive reactance of that induw4k*ys68z 4e bc)phrj p5spr*ctor

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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 ind(du g4 tkfa2 pow.;mf(s//d jcuctor approaches zero, the inductive reactance o.kf2 gp d/tuj fo ws(a4md/;(cf 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 kc.k,n**w :uw0 v9.pdtktcrs supply. In this circuit, the curreds.v*tcw *ktn.9 :up,w0kr kc nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanc4.uimy3t,plu 4 alwuytf /.g)e in an ac circuit changes by what factor when the frequency is triple.t ltipw)4yu3u.u /l ,4mgyafd?

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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 acrob- 23j*) ) vepnrj l,owomby6q(d r)gtss a capacitor approaches zero, the capacitive reactance wy,e 2-qd *t))o6njjv)3b r(rlpo mgbof 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 betwe2tagkyz8 1iz*h5arv8 en the voltages of the inductor and capacitor in a RLC series8vy g1atz8z*hk air25 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 de eu .cw)s0pl. s)tn3//bs lzscfined 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 impenj /m pu h+qd*(zldov5lnv o,a*7 g6*zdance of the circuit increases if R increases. When is thiz6,z5 v7ga*pl*(vou/+ jl qnm ddhn*os 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. Th9uzka5zgn*t( 2)h* akp on5b se 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. The impedance of the circuit increases iqn)kmj,(o *-hwiyi3pf $X_C$ 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 nn1,y8wq6 nmklacji6q,) s*lcircuit, the resonant frequen*y8j6 lnsk,,ncnl q)6aiw m q1cy 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 f q*hjz29l) b.hfik:bby 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 serie6mxww(1;sn* o7 c ui0yk8zmpa s RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uni8 6asy4zlh)gfuz/s / iform magnetic field of 0.20 T. Find the magnetic flux through the loopa s8lz /z )fhug4iy6/s 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 ma:c+2c hg2ds wygnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of +y:cd2ghcs2 wthe loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fuder v-2w1 t8:ps2xy hield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thwd-:e 1ut82prvy 2sx he magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduj5ht-r,1 cts 1t2dwx7t /ru-ii yy4usced 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 ch0ct ( y)9pokbe.5j droil 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 s gb4.m g.0nuo200 turns of wire 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 4. ubnm.sog0g the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and aha70 4bh:gig/vf o6c cn 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 aem sc3 uz;a- ot7l8e)vnd 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.ku(q 35 pntni flies horizontally at a location where the downwani(p5kqut n3. rd 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 a consta7smox1zqpzt zge0w nw 3: dpo242yx4g(ef .m1nt angular velocity of 2.0 rad/s about a vertical axis thro:gozsw2 2qz dpx4zm.fexe og1 y 7m0t3p4n(1wugh one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 y)7sla ;q8uxs jqt( jiim41i0 loops and a cross-sectional 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 i w gq:uj ,c8(gz7eq*q100 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 armature. Each loop is 12 cm rcwxmm86;:heg2xq; q k9f a/os*yaf6long 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 9 k/g;cfaq6*s8y eq:ax2o hmfmwx6;rof 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 turh 5nu, 6u8ev7y5i5 *trk5zgw1 w nkdyqns 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 mn h(-a5t-xhtsimple AC generator with an output of 12 V maximt-xa(mtn -5hhum when rotated at 60 Hz. 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 generatozlzo+64tk k( sr with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.avq1d bq y57s*1mbu /gee dn1,00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Ttea90cz:xb5x+mmb n - fe7h+jhe motor operates on 12+xj7z xa509mcb n ebemht: -f+0 V AC, 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 resistance 6.0 W is connected to a 24-V power supg 9zj(m, 3vu+4eyyxbhply. The operating current is 1.0 A. Whathzbv+ j, x(my9u 34yeg is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2 edh y(kuw g*g*ms;9j94-V power supply. The operating current is 1.0 A at full speed. What je;guw9*ds9*kmghy( 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 sa.zsrc x )kz/g*32sqj:yw8j supply. The operatins:zg r)q * zx3cws2.8j/ysajkg 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 612rv8pxnvsfto 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 rx0ur qjas5 2)(o g:f xgmvye+c6 d69fthe secondary. H+yor u d ex:5mg6jvqxf0 ag9()srcf2 6ow 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 turng)pa:8,9 u)sa3 mbfizuk : lews are necessary in a 110-V primary if the 24-V secondary has b m )lg3:)pf8u9asei:a,wzuk 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 6x;2vkyh+un6p7 qggxcoil and a 2000-turn secondary coil. If the currenk7vg2uhp6y+x n6q ;gxt in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in thenn-x7 x1hl7fw primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondl fnw1h7x7 nx-ary?

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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 trayp 5t -jmj2br;nsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?jtpjb ;m52 y-r

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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 primayu r n f)t3 12cn/uzw5s4ocur1ry coil and 300 turns on its second1rcz 3 /ut42yu1nnu r)owscf 5ary coil. If 120 V at 2.0 A is 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 tu 2o3k1ll oid0fq ryt6 /f:pc7xrns on its secondary coil. If 120 V at pikf2t /ylo xq0cldo:f31r7 6 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 turn), c1uv ic)fcus and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at tuvu1 c, )cc)ifhe 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 fv7xg dshrtq bd1./+*s9.:g5wftq v;eits +o and its secondary has 200 turns. If the input voltage to the h5g its*evg w . qs/;vtt97r1dfbo+fq x+s. d: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 tranh qbldu;j:tbd/1 s0pnz1w0+ usformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the sbh 1/sddplnj;+:0u t uzw1bq0econdary 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. Th6lj9cv/42krqufu0,y uj1 type 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 the secondary ,4/pqfujjkyc u6 2rl09y1tv uif 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 ae;vut j3jv* or,,y*g ssdbnvsb9+6 4zt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmiss;*vo,,jsb+jt*gv3nduy6b s z v4e9rsion 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 usuall 4mz+wwv 1pk 3/nmgj0iy stepped up to 4500 V by a transformer and tranw v4z01+ /kmmijpgn3wsmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total revkby62ees5rvju/2 j6x 3wt e8o63 zkzsistance 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 the original energy would be lost if the transformer were not usejuzwe 2ej/6skk 63br 28ve5xz t6vo y3d?

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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 lon1) ys1 d txt0xsce.hz(g 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 ocs1y(d htsxe)0 x.1tz f 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 atsnji7lab4h 0tj* shk ir933k. 1000 V. How much less power would be lost if the power were transmitted at 30i3hj ka 4b.slhn0 *39jks i7rt00 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. zdu /b1yja e,3 It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepa3ze ,j/ 1ybudped 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. How much energy is stored inc-4 a(dtsb )rifl ;vq(,rt 5un the coil's magnetrqt,n)f(;( b 5ic- rvlstua4d ic 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 6.0-W resistor and an 18-H induc+u+ny;hz a:dx3f j,gy tor. What is this circuit' h ,zj:+na;dx+ ygy3ufs 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 circu- z deths7(1kgit 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 1bt9)a7. ikvg )blq 4llm*zs x/20-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 120-V AC outlet. Whaw1a8mx je: q -t 4dv2h:hhy7l ncz*o:5,ogehyt is the resistance of the lamj:7h ny2zh: y*t5e 1 v-olm8ea c,hd4howx q:gp?

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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. lk+2etw2 *cisr ;np f2 What is the peak current through t+f *;tklei2pw rcsn22he 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 the power duyd s6acu zw1-/u4g j-issipated in thesu 61jc/uz u4y dgw-a- 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 ge3m. 6yawvbx j0/t/fresistor 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 res0+vgvz8ffiyb7f1 y;oistor 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 wbz /)io d26)7 ratz.zs4yurgresistor 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 a c2anbv +)awq76 srn08 j3jhwwt 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 reac1;wxe: kzm ;j8sy7s/luez ct (tance 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 14.0g(qv :g+f 8ks y6pt 4yjwmc4k 04q+iek-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neceibq;e( i6tfe8x3la.fh2 k0 t jssary for 157 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 60- :1,vu* abdj.c9slj wymH inductor when 120 V AC at a frequency of 20 kHz is aa:v jl1c*9.u bjdy,swpplied 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, 60b65xs l * lw(++t) thngc)bk grgkx:u6.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor l wc u;pz8c mv188p(miou)e,oat 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 5vrj :7bj1hglzz 6,j: c0 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 have a reactance of 120 y (k.o:zi2cxo,-dayeyt oj 9)0 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 wil0bl6f 4 aapr op4ei8.;)m-a v1hakjx tl the capacitive reactance of a 0.010-mF capacitor be 100 W-vpa0p )aj4.fblm4ot ar a k8x6h;1ie ?

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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 thq0d 2z:.fgsx: f6zw vorough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an aek -/9qtit-+v*jk exgc series circuit with 12.0 W resistance, 15.0 W inductive re+9tg-kqex * t/- vekjiactance, 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 r pz7;mgat+do1esistor, 20-mH coil, and 1.0-mF capacitor are connecz7;1 mtag o+pdted 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-Whu -vuf ry+i/l93(stv resistor, 20-mH coil, and 1.0-mF capacitor are conn+u f9 v(yu/- rstilhv3ected 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 co 6kpn-x8hh* ; l+y ooc4v/amqxnnected in series with a 20-mH inductor, what is the ih npohxc*maq /8k v y4l-;o+6xmpedance 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 20-mH inductor, w2,rvd v eciflz5n7 iyu .n)x14hat is the phase angle at 100z4fv.1,l5 7xdy ervnu 2 nc)ii0 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 coil9;6 x ymicfrm4hl 5r8v and 1.0-mF capacitor for a total impx8 rfrlhm;6 imy495vc edance 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 seri)u rpqpq -.d3nes with a 100-W resistor and 15-mH coil to get a total impedance of 110)qrd-npu 3 q.p 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 Hz y5x3bik )rpkwoi( )soqq 1* ;ifor a totk*s i qoykq ip1wxb)r()3;i5 oal impedance 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 mustdofwf z97d *g-fa( ry, be put in series with a 100-kW resistor at 1.0-MHz for a total if7w d(*rya9gfz,-f odmpedance 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-mF capacitor. What is tzwbuk6bjo 3*(ty8p x 8he impedancew *b8( x o36yj8zbukpt 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 capacitormewscke 3 ;,3t at 1.0 kHz for a total i 3ces k;tm3ew,mpedance 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 capaciw/ompc-md /q09 dg k5gtor at 1.0 kHz for a phase angle of c md0m qdg-g op/9w/k5$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needapr- gece7 n9pot4 ;nls+2rc3ed in series with a 30-W resistor at 1.0 kHz for a total impedance pltnn3rgpr c ;e +ac4e9-os27of 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 at 120 Hz. What is the 6yg-4x a e3 bs7s7 o5jmdbqd:ephasxg: db-omj d643eea bss5q 77ye angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows atq4mr5m5ak*m i q(bu:a 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie*:bma kamq m uq5ri(54s?

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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 resis+ku 84qs;meexx4 vh,qtor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in thqhxk48,ve m;x4seq +ue 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 66zw/nbj g +.3spykx hv5jm,a an inductor o g+jnm3.,w hxb5jyz/s 6k6vp af inductive reactance 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 for a series RLC circuitb/7jt ; bm.xcbbh u1+n containing a 50-W resistor, a 10-mF capacitor, and a 0.45-Hb1nx. 7/hctbj+bb um ; 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 serem xg1gkqpjq a2;n; ),w7d2p dies with a 500-W resistor for a phase angle of ,; q);g jd1ppk 2m27wxaqndeg$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. A 6kb0(gz th5w n,yc1vst what frequency should the circzn, hwb50t(k16gc svyuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power outpjyb1ua2a. fd m);dj;but in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circ ; fyabmdj1 b.a;duj)2uit 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 is8 y wgqowdbto)t/46z; $63^{\circ}$. 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 (hcfiem4 5 4/2 a8cwhqzzstalr;,t 1 ja resistance of 30 W. What is the power fact/4fj,at8zhqs1i5c rtmw 2;(elaczh4 or?

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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 containin6:s +ks,nh)rvvp ;fmcy*gdyk ibx , (0g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect y0 fs h:v) ;n+6,imdygxkr,*cbvpk(sed 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 capaswlo2tj fv;k(vfa :/: citor and a 15-mH coil in series?j:vvk; :2 a(lft/fow s

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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 nycjto*99r5 ak vm (sm8m)u1ke. b. oxwith a 4.7-mF capacitor for a resonant frequency of 10 kHz? .k mt5oucnek91b.ojv(98 )*ymarxs m

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is t cgp55t-f,q5crs1 zkneeded in series with a 3.7-mH inductor for a resonant frequency z5c 1-kf,prq t 5cstg5of 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 mus,j a/w vtvj:znfn7c9,mis. 3tu ems6+t be placed in series with a 30-W resistor and a 40-mH coil if the resona/nnms ejf9,+uz7tv it, a jcms:6v3. wnt frequency of the circuit is to be 1000 Hz?

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