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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of m2;u /ke4jnsywagnetic 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 thete-r hp6jd jpj92(*pe $emf$ 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 3dj4usc(h zex ()*fy iof wire in a coil produces what kind of change on th) du3s (*cej4fzhxy(ie 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 produce4k2g8i-gni 16 z ruhmwfv+2pd s what kind of change on the inn14drg-vum2iz gkp w i8 fh+26duced $emf$, 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 aqsd++lcv fe:6-iwa4of change on the induda+4qewvslf6-c: +i aced $emf$, 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 a3,pph)rkud1iy9v m z6( 9,r)r s hrchfield 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 in a conductor i g-o3jo9g1d 6g w/0hzue4fauwill be that which tends to produce which of the followohg09u wj6 3zfedo/gi1 agu4-ing 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 h+b4 n :b3.0 5mutp 8nhviyiyrmorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet indu8nbyn5m3 yib:urmvtph 0+ i. 4ces (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 4a*yqn - ;otynheld above its center with its north pole pointing down, and released. y;ano4tn-* y qAs 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 4mwvsmtn)u-oe)/u ;n a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, whan usmmw )-;to4/vnue )t 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 top in a region where the mam g7 +o.el v2zcf7t8jzgnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the f7olfjt+ec7 m g28vz .zield 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 horizontad0p zqu xrrr+e *oj49d7to4 q)l table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the ind7d e4t*qp drj r0qozrxo)+94 uuced 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 horizju juti0u)o 2y+46 eor3;e xzsontal table and carries an ever-increasing current northward. Two corx2o6i)04ezoutjjy u3e + su;ils of wire lie flat on the table, 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 wit /1g,wk6 ,6l22gvb6mrk5ifuawbqf dih the north pole entering first. As the north pole enters the wire, the induced cu/df22 6u 6b,ka, viw6mw1brlqf5i gkgrrent 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 rotx**p ddmv0j-eated at constant angular speed about an axis whose direction canm* j0pdvex -d* be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 spk3fq63k )vbf5 5t hholc 6iw-seed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the iq)lot5sb3wc5i- 66 fkfk v hh3nduced $emf$ 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.. 9ocpuoj-9mwy/q (gt
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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 u* raaw1n5zp(:lyfk ;*9 ncixthat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetzb 4; 84yaptk1ply m)fic 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 eastbxie0 59ebres;h6(t7 i/x dgb -west direction) is moved northward at constant velocity through a magnetic field that points straighbbg ;e5tx e0e9/sidr 7x6(ibht down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloc*7 dxk2+l7 4k m:xo6cre9gq mjuz;utz ity $\omega$ 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 generatold; v+uuuuv4 y9-4zvnr transforms

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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 myxsac0y 3/h-vf3/ f vrevolutions each second. The frequency of thhf 3 /yvf-cxs30y mva/e $emf$ 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 usz e7+ t a0wicv0xwdi.7ltv5( jed 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 tjxp4x;g lrk3ho31(2zhs +c* ffj eff6 hat

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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 morevue,e/5 sp0u rww6olq ;j;7ea (zpc 9a loops than the primary coiauw6pu e0pj oeq;l,7/ve 5s(cz w9a;rl 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 coc;zsui s(5/si geh*c9il contains more loops than the secondary coil then it is agis c ;czuhe9 (si*s/5

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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 powqmd y8tk(mk 26er 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 (fysx4/kpk6j circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery i zy426o egsw.ld-iuc*(fd2 mof constant terminal voltage. At the moment contact is made with the ba22ise (6wiugm.*d yo -lz cd4fttery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectedz-,mnhlm 9 gw* in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thg,zmh* lm n9w-e 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 to jd 0+coo*xg3vfzv2 4 jan $emf$. 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 inductan47 izcjmm *s/xce 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 inducnsx (4(wn kgh2tor are connected in series to a battery. The time constant for the circuit represents the time requirwgn (hs2 n4(xked 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 arm0 jxzqrx6ge f00v*ioxg- n1 8e connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the c v1zgiegr 0n0 6x8-mxq*xjof0 urrent 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 sc96z+ w;h;az+aj h4pd)b*jg 6n iwvuunits 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 xr6blol 6f 0,gq ;7oyjpower supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power suppy tg)hf +7y0qply. In this circuit, the current +)p gfyy0q7ht

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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 facto; mcpq; ijil(4r when the frequency is triplel; mq;i j(cp4id?

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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 vo(ued6mufmg7 (ltage across an inductor is doubled, the inductive reactance of that u(gm(udfe6m 7 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 ah/ 5ns*tf/ed ln inductor approaches zero, the inductive reaceshd/ /5l tfn*tance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the curreme g54t1fttriu;z ,n1n ,1ttt u 51e4zgri;mfnt

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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 q6d94 uv01rx r:jrot pwhat factor when the frequenc6o0v4 u:rr q1tr9xdpjy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, tkn6 (x0nhk9 d +q3u2v gc-ks, hhnqca)he capacitive reactance of that capaci chnks,c+nn6k9d)aq30 u x kv2 g-h(qhtor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and ca 8;6cwobq/mqn pacitor in a RLC ser; wq mcnb6qo8/ies 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 circe h708 soseus9x1 a,ycuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuir:,*kitpiqo (:di on9 sz;- hk5ymlf /t increases if R increases.(k,hmi*5z: prt;i:n dloo-s9/qfik y 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 vil ;8ry5vmo *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.tt-foy/:qh kd)ryb:t k22 70vr 1mbsd 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 se6i4y 5le ,j nkvlihi +8vkd/i9chv :a6ries circuit, the resonanth:i5,v6l diykhic va+kilenj/86 9 4v frequency 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 i 6m0y. 6mhup, -zrbihxs driven 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 circu n6(ixfskn*d 4up3 ((2z hlwijit 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 rotatingpytohm o 6,,zyi:oddpzy( kv:,tl4.( in a uniform magnetic field of 0.20 T. Find thez(op.yky, t4hpyio t mov ,,d:d(l:6 z 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 radiu-wfw6ac388aoa b4nqxbx6c. x s 0.10 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 field vector a4xb-.a3cxna8bq6xo ac6fww 8 re 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 rn8. mnzup.ln,otating 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 field vector are at an angle o.p8lu n, mnnz.f $30^{\circ}$.

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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 reduce9l0 ib5ddq b7ud 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 hu p +w6f uv2jl3w9m)fchanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with side 6c0riy na4d:zs 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly froy:6n z4a ci0rdm 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 0aok+6otapmgd vw 9ug+73c /f with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and are wtyg57l3 n4 nyil6j5ua $0.20 \; m^{2}$ 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 fliewp2 f z(ku0f0 0:93xyxwy-fawoog-w ss horizontally at a location where the downward com u0w9fp(-:2-yks wwzo0 xofwfy 0xg3aponent 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 ba kfv6,vr0t 3xrr that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends wt ,vkr f3v6xr0hile 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 cr/5/f(im zkx owoss-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 1plop:c)gw2mhi.vu:ao3k07ljgqt 7 000 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 loopsx w4yv.z4t4tg on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotationtxgz4 wt .4y4v, 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 ofr6;ae g3lwj4 l 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simps/ yl y.0+ 0lmqt 58jth1pvxkfle AC generator with an output of 12 V maximum whty l/ +8s5px0k.fmtj1lqy 0h ven 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 genevxc6zefg fo cp5od:+k w 04d5)rator 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 6.00 W. The motor operates on )jy)39zyfuueh k (ck7 kxp9 9t$120 \; V$ 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 hav). r:1o lq,q ctc:e.xcrm0 qjde a resistance of 6.00 W. The motor operates on 120 V AC, an,q.m:o:e tc qx1 l)jcdqc r0.rd 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 res5- 5fuei (hpxzistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the ihf5u -p5e(z xstart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplygm*h* .ndg s jiku,3-k. The operating curr3j,-khs gig kmndu. **ent 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 intern towlz.1 z:j2/4+ xw2fwnd1lqm5wfspal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.w jf2n wl/4ldo pt1 wwxz51fm2:zs q+.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 t k/qpi7x 7uag( tn5epccm:q8 )o 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 transforccb odl*+ 4lcnr:3. demer causes 14 A to flow in the secondary. How many turns ad o:clr.lb4 n*3ccd+e re 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 primary if the:u4 z:o6 y-v +r f4lgsqwra0ok 24-V secondary has 1a o f:0y4quwl kzrg-r4v+6 os:00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consist;pwvc .vv)q/k1nyx /ts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the pktx n y1c).qpvvw//v;rimary?

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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 -de7xut*o r pm7* ust-100% efficiency, how many amps at 24 V can flow in the seconda*d p*rtomx77st ue- u-ry?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer prov9 4( b4juuax4tjwjlb )ides 7500 V at 10.0 mA. The primary coil operates on 120 V. )bwbjlxa44jt4(ju 9 uWhat 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 an8c:wg zm:i c7rw68eog2fe v7t xo4)edd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?e8zwx8 od:g2: o crwmcgf7)ie 47t6e v

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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 c7xi8ds yd7gh 5oil and 300 turns on its secondary coil.hg7x8 iy7d5ds 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 le8 ko r 8 /a37osx4a;-cygj i(if8uudits secondary has 200 turns. If the input current at the primary is 100 A, we can expect tlxougji 8d c/4(sea -8r7af8uo3iky;he 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 andkp sbppbko- - -myy.gioc3023fgs. / v its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sgbfg y-0m is-ks2pp /y.ovboc-.k33pecondary 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* -d;obon)ih h 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 secondard hbi*-o)hno; y 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 curren0fd +tb:wn -be +.nor5nitkj (t at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 bew0n.+(rbd+ - t5n fjo: ntikW. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thchg-g*g 6 j 2tt+f vuok-0a(moe voltage is usually stepped up to 4500 V by a transformer and transmitted through a powerg-v (o2+hfm g-g 6juo*tta0k c 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 u-- n fjj8l1:szqzsx 9(ete3ilsually 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 transmission line if th(x1q:9e-lifjsl e s8ztnj3z- e 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 sals*vz at)r2 .uvk62has 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 zk)vr2. us6 lts*aa2vwith 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 50 km long has e) 9jae*r)ljjp7g) rs 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 ejeg7j)9p)rl*ar) js 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 lxmn-9zp8huf-l y8b/v ess power would be lost if the power xfv 8h zbpnl-u9my/-8were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to sb z2(cpz3o0 og, mprch:,toqn)k p590x5dndbe transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the p,do5pcxog5 dz)0p9s r (2q p3omzc nk bh0,t:nower 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 i5 mq)w+/d yn+sdqhg)5.0 A. How much energy is stored in the coil's magqwg/isq)nddm+h+5 y) netic 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 resi5)a 86/vlz2+n5czuj pzu isaustor and an 18-H inductor. What is this circuit's time constantz uv na)6ai+z/s85culzj5 up2?

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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 voltagr9j,bo3n 9xbse in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-eh/gkchya. op:* ( w3dV 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. What is the resistanvlk*q rb:vdq28 b 400ktnh6njce of the lan:vtdb* jb4 60kkr 28lqqh0vnmp?

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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 suppl2g0 enawfxbe9b6 ( wm+y. What is the peak current through the rb0ee2ng+ 6 xafw(9mbwesistor?

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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. Wtwcbd an6*(// tc p5jvhat is the power dissipated in the restvd(5/6*w /nc pcjt baistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through (azpz 85 t;kchs-ab q,a 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is ew e24 f7js8zz;;m qrp$I = 0.80 \sin (240 t)$. 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 resistor isc5ltqnj(r 3iiiv 3s 9:pxy9tb+ 6ve+m $I = 0.80 \sin (240 t)$. 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 reactanc-8.6bn jgcrs: x*-q njrlze5 re 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 react7sq.qo 0 bcei0ance 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 hans4og; w xemny6b,(4 ove 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductpbmg 7 lqerkf56d+; j*ive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inf -iv.nzwzvzpgv2jf y/w1z 3ee 76p5 ,ce2ha(ductor when 120 V AC at a frequency of 20 kHz is applied c2 h iz(e w56v1vfyze,7-j/vp ng af3zz.e2pw 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, 60.4vs)g/v ju jb)0p-xv z0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHm,i4i(chsh h :z?

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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 capacivi 7kty s0t(o(ldiw /q4a+;uvtive 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 ajeq/g finu8:c ut 8qyl0bq)01 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 2;2lbf7we z v /id(mfrjed g ;4q.e3mw100 Wwwgdei e qv m;(em22z3ljdb/rf7;.f 4?

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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 l, kbc mgxw:g;l5kf 1 k;1xmi+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 ae0v mh8w;; hdtc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 18 hdew;vm;0ht0.0 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 Ho:awwg;s(l 5c z if a 100-W resistor, 20-mH coil, and 1.0-5:a(wcw go;l smF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH sm sufr.colf7: mu)ybv.y;/ ,coil, and 1.0-mF capacitor are crvs lf/s; ymy:), . m7ubu.ofconnected 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 the is xi .*w,xp,7k/wd(aweudn ,impedance at uw(*sawkii /xx7p.n,, dd, w e1000 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 wotifn jhk-pe.nh g2qz :9v ;p 9fim ;yrh;(5c,ith a 20-mH inductor, what is the phase angle hnez vfh9p mg.-h2q;95ioyifk nr:p ;c ,t;j(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 g6sxgphf30 b c0r13l/m py9tdcoil and 1.0-mF capacitor fopdhxmbg06 sgc tr f3 /109p3ylr 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 with a 100h+p .dq,*pg 9vd(wqpx-W resistor and 15-mH coil to get a total impedance of 110,x9.+ vw (dgphdqp*pq 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 for gwmm5 v2rs2qh(f0kz5 0i3 zr qa total impedance o023s if( r50hqkzqmz2 wrm 5gvf 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 10wx1pf q1 kbk2/0-kW resistor at 1.0-MHz for a total ix1q bp1k2f /kwmpedance 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 50o( g-bvpd x (.spgezwljy/* the impedance at 1000 Hbp05-o/gz( vd sejl.p wyg*( xz?

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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 id dcrey**lx6: agn/k :n series with a 10-mF capacitor at 1.0 kHz for a totanr6k/xa lgy d* ::cde*l 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 1.0 kHz for hvq( jd+3q+h9quai 1j a phase ud h+ jqqq1ij+a9(vh3angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kvj,hhjx7t e2 )dkz fi2 i.nb x9.d0galw;t +3sHz for a total impedance of 45t bs2.gv .+ jdj i,x)azf3hx7he2tiw k0dl9;n 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 v +l l1 vih d;c j(p4zfi84dpvfs/v-o8the phase4d48vpsvdj i o+1fv8 fp/l (l c-vzih; 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 at 5.0 V and 1500 Hz: zlpbu+f5)z sw1.zy ; p yfh:ii/7fpl if a 100-W resistor, 20-mH coil, and 1.0-mF capacitozz)ffzpp7ih p:l 5; wiy/s1l+.fb:uy r are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100(326t- lctkraj9omsx -W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected tocr s -t a(m2jlo9tkx63 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 re2 nobmdl:9zr,f leke ; iw/q*-actance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-H/:eqd z rew92imkl-o,*;bnl fz 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/ctj- z1:3vv nkh ,yya RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45h nt/acj:, z3ky1vv-y -H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessarv,gjbi)yr u( n4v/w0 ay in series with a 500-W resistor for a phase angle of 0u wir( v,bnvyga /)j4$40^{\circ}$ 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. At what mo8.ykxxut2 q;,:xtbfrequency should the circuit be driven in order to have maximum power transferred from the driv28tx x:kx,moy t;u. qbing 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 sivw*a s)qh+z+ 40b lian ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capav+a0wi sq+*sh 4zlb i)citive 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 a9*m/) idtiqsbly t4 ;qzek8: zn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance+g kjbvyc.d w2* q xsi 3/xgc79x5n*gb of 60 W and a resistance of 30 W. What is the power factoccg q xxvdb. * 5/b2j9 gk*g+x7iws3nyr?

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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 fann jq (cpo(k 4/pw*wj2n7p0mu ctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to (4j2cnmp(p*pu0wj q / n7onkwa 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 crnipp 0a l728xapacitor and a 15-mH coil in series?aprpx0 i87l n2

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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.y az75 .g(-uncqrczw,oom9w 4al50o t 7-mF capacitor for a resonant frequency oftc l4mu,5 ryca-7o(z9z nw5ago o0.wq 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 ho3oo*6x6aow0ye+ un /d hp-nwith a 3.7-mH inductor for a resonant freque+ooho pxd6an6on-w /03ue h *yncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in s c2a wt58)9snoj bf ,okv)ir1yeries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circyo rb521f, 9o)a) njswcik8tvuit is to be 1000 Hz?

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