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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excep;cs5sb/d e3im t

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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 thatkit.7i(f gbly;c 4t- u the emf induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of changi*,gmq x dw4iac79 o; i4p.jy*v5soume on the ina, g5ui*xqcojd79imw i4y4vmp . o*;sduced 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 magnepov: i d0fvamaos54)9vdj)8 itic field through a loop of wire produces what kind of change on)av) jmao5ov: d8dpi vi4s09f the induced emf, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire pok-avr5 / 0f7ghfc3iiroduces what kind of change on the induced gir0iv 3-ckf/5a7 hof 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 5nuh am.a 3ye6gor 6yq9l 4j;ufrom a magnetic field an emf is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conduct7q9o.6u 9fwkea9dryu or will be that which tends to produce which of the foye .wqr9 dak9f967ouullowing 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 onl a zkb6,zf2d7,oxm;z a horizontal table. A bar magnet is held above its center with its nort, adb7zo2,;fzzxk6 m lh 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 magnet i0f.i d78ygiz 3)cw ,mpyfsog(s held above its center with its north pole pointing down, and released. As it approaches the coil, the fadw7()g p30fm.ocsyiz,gi 8yflling 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 wher;uk 17viq:5pk*q nugv88lsyx 84 bdeu2m(q hae the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil aul a8g(e: 1k5;vkpq8x2qb* vh 7uy8 qsdnimu 4s 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 wheree*o /dnx* fuqgj4c;p rad- *(m ;bqe.l the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directiodqun.bfoepdq a;l4jm-( /x*rgc; *e* n 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+r25ig7oxpg u v2y.wh region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced curreniuy 7xh rg22p.g+ 5owvt 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 eve*uv ( w4qlmmr+r-increasing current northward. Two coilvr*+w uqmm 4(ls 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 t gv, (-fwds.gghrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current wisv-wd., gg fg(ll 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 axiyy*.o5 l p y-s:q2zxzxs 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 ths.-q:*lyzyxy 2 5xz ope 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 c-.wl10 zbj,e6q njzjnonstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poi.z,l- n1q jbe6 j0nzjwnts straight down, what must be the orientation of the loop's axis of rotation if the induced emf is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.z/526rj0 x+ vx tc;zwee pa/iob:+9n ydgxw4l
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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 t l -yi op1ro)ikq80nof43uyl)hat 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 magnetic fosjbdr)3( 56 w 9q /2vn /yrs1cyyydxdield. 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 directio-8ge1*intew p n) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pg 1 -nw8tiep*eotential 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 a(zi5) *0 pf .s.khx:klqqsaylt a constant angular velocity ω 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 xq+w66ueo+je 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 um v gj9obdnd) hr5d3yh tgj-.*9ofge+ 3x6:o60 revolutions each second. The frequency of ty3* 9+nvh5bggj:ou3rdd9 j. d fmt6)h exog -ohe 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 use d -1zq:hgi9ldd 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 e 4t /cucd,t/bthat

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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 containsg1ww*gf9xg0;szcvkl462a2 ogxip tx.7 on8f more loops than the primary coil then it gwksa c20tfx x. *v2l7gi 9gxf48o1 zo;6ng pwis 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 m4+;b r 3gjaxi0o4es kzore loops than the secondary coil then rib0jgxs4ka 3oe+; 4zit is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the poqdttw 36e10 cpwer 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 yvco2eknz)5 )+gpf wenh 7+7kcircuit,

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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 serhahsv7p.)ahg j uu;i)8f1w ,lies to an ideal battery of constant terminal voltage. At the moment contact is madegfp8h wjau)1 7l)au .;vhsi, h with the battery, 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 c1qc9pppk4.fy onnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thekcp4fp p 1q.y9 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 inductanceq;.u+in (h,cbn -s20(qiwzdxfv sfd- 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 inductance L and resistane wv-qt5y0ug 4ce R is connected to an emf. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same emf, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to u kr n; *y:aj29urnli:a battery. The time constant for the circuit represents the time required for the current to rea2raj *nk y urilu9;n::ch

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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 sv+cvxko1ef413l l.os eries to a battery. The battery is suddenly removed from x3flv 1 k+o1s.lceo v4the 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 sauos,p /a ldj.mm -o.;r, uu.srme units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to a91wstp/(usn czei,q4z( b 49hnzdz7qn AC power 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 cs5v . *+,jsblk7xkg avonnected to an AC power supply. In this circuit, the curren*sj g5ls,k .xa+bv v7kt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequelo v6 ei01 i)qpszmm8 jzk:f,8n8,iio):f1z jekz8 vl6q0m spmcy is tripled?

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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 acr97)v xln+ndmu73vn qj oss an inductor is doubled, the inductive reactancnvx 3j9ld vum n)+7n7qe 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 the AC voltage 7 xk6nmr/7vt c, :xfjzkyn5 5wacross an inductor approaches zero, the inductive reactance of that coilm w:/t7nk yf xzc6vjx5knr,7 5

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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 thnli097xlq1lic/sk.1gjee*l f /ogx6is circuit, the currentlgiil1*/e 0xo f.lxcjg1n9 s7k/elq6

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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 factor when the frk(3fahzhj.b e:h/ m5n equency is tripzfnh h:5bm3eh/( jk. aled?

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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, the capa6. ,.fhk8xv m8g twlfcs7vvr*citive reactance of that capacit.gvxv,ff kh 7rvw c *.8m8lt6sor

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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 betfgwc/ mk2a,zp2yb2r 8ween the voltages of the inductor and capacitor in a RLC seripby8w2 /frgz a22c ,kmes 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 ci;- k* l5czlmavrcuit 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 circuil :eflks p70i +.,qmgpt. The impedance of the circuit increases if R increases. When is t:.mps0pe lfq+, k7igl his statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuygu wly2dxoz4 ;/*;9w igmip *it increases if XL 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 impedann;pj4ixah kklj/n+ :7 ce of the circuit increases if XC 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 seriqzp(w lky4,8c es circuit, the resonant frequency ofcw4zpkl y q,(8 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 m/1ev4 1fez awthat is 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 RLCnzdu, * ptek52 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 4.0×10−5Wb 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 radiufqou: 06-q k5p 0qfm4v)rvsql s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plsur mov-kf qlv qq)0q4 fp065:ane 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 unifov-9*qdq w5uf yrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the planed5q-yq9 uf *vw 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 rotating in a ulvbm)rrbnt2p wxnkj319+: * lniform magnetic field of 0.20 T. Find the)wv b9bx 21trjmnlrpk: n3+l* magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of 30∘.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional qspu6 r 6)qwsk-6 y;3e6,av7uotkgtif- vp+z area of an adjustable single loop is reduced from 1.0m2 to 0.50m2 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 ch2tee /k7 6ba8l0 8uj1wadbvq uanges from 4.0×10−5Wb to 5.0×10−5Wb 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 2 qgw8f q,;x)-z prlnj.7pkp o700 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpep f kp j-xqq8,go) npw7z;.7lrndicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced emf.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an arefw*+8s gqg: ppr*nwx) a of 0.40m2 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 ao*xu :me4(ngpnd area 0.20m2 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 thf(h l.ekgbdbf1np )34e dbg). h3bedn4f (pl1kf ownward component of the Earth's magnetic field is 6.0×10−5T. Find the magnitude of the induced emf between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant p6 x;8vc* / zba;pubxdangular velocity of 2.0 rad/s about u*vbbc p8;/;xz6daxp a vertical axis through one of its ends while in a constant magnetic field of 5.0×10−5T. 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 generatorkz., 8ejpmr9x has 50 loops and a cross-sectional area of 0.25m2. 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 turnsb r;ahbra r*4) of wire of area 0.090m2 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*g7,g ym ;u5rsuc.fek loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of uykc.* e5g ,;sg7f murthis 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 consistsqfln;98en f+m of 100 turns of wire of area 0.090m2 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 s lv)joo4ikrha aq(/0 6imple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T isv)(4la6q0a k ohoi/jr available. If the area of the rotating coil is 100cm2, 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 maximumaoh:hd z* v;*fle.zz, emf of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of 0.030m2, 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 o(u bys(3 u0hwua /vx0sf 6.00 W. The motor operates on 120V 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. 4 nad/8fh/ gjsnjs+ 4q0uy- qy The motor operates on 120 V AC, and when running at full speed 0a/h-jd n 44q+ y/yf sunjqg8sit 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 powyn*sam pr7)m :i :v2kd4ki jxu5b) h1ber supply. The operating current is 1.0 A. What is the start-up current?5xm4mki r*adsph b): vy 2:bn jk)iu17

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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 powerwrz.zf as - p*,wz-8ra supply. The operating current w-pra8,r-za s.wz*fz 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 connected ci 1fnsj2uwwl 1).og1to a 24-V power supply. The operating current is 1.0 A at full swus2 1g 1.wn)ifc1l jopeed. 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 nep+ t:oxr ()an-zn7io xi/wgf7 eded to reduce a primary voltage of 120V AC to 6.0V 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 cauom i5p;,jip2i ses 14 A to flow in the secondary. How many tur2p i oj5i,pm;ins 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 turnt+i( t 8 v9aby9w9hnl 8doi.ye5lrf5ns are necessary in a 110-V primary if the 24-V secondary has 100 turonytf5lbyal 8. r+vnh 9(wt de8i5i99ns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists ofhx8jt633 jefzl bm .pj5g. z1q a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whj8zzjp5 bmg h 1x6.e.3j 3ltfqat 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 pxr*4na8kugjp u4 hn;2rimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flnpanghuj;k*4 2 8ru4x ow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tus 8(r n9h:hpcransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What do rn sc98p:hu(hes 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 ,f,ddz. ew+kd on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tw,.d +fekdd ,zo 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 itsx/ uwqms:69i(5xt o no primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the s 5o9 qm w:isxxtn6u(/oecondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has lpyc zk(y12djyz2 4o. 200 turns. If the input current at the primark4pjdy.yl y2c (2zo1 zy is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu,ovwkb9/m4 l akw;wx:rns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to9 w 4xb:avom/;kwl,kw be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu p1a; cy.qh3;zml b*xr u/d2)yyjmue9rns. If the y d h.1yrx)ma2;*uj/ bc p3mqeylu;z9power input to the primary is 100 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 12u1r7pfmow ic3qk+r .- 0 V. The voltage is usually stepped up to 4500 V by a trar+1irfp-w c3.m u q7oknsformer and transmitted through a power line of total resistance 1.0 W. 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 oy /c0v0i.rnxp7r gesrp +g9s /f current at 120 V. The voltage is usually stepped up to 4500 V by a tra0.cs7 v/x/sg0npir9 g+ pryernsformer and transmitted through a power 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 voltag-.i kj0lr 5u fl8mkz7lp+rk8se 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 transmission line if the voltage rm. 7zsp8k rkl u 8k+jl5f0li-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 resistance of 0.60 W. A genyz5n)7c . bni6do/xps-hbz( derator produces 100 V at 70 A. In 6hn/-)i x7yod.sbz( zdbp5n corder 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 used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resm 6)kogwgoy. :istance 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 )y:wo k.gm6o g100:1. 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 lessz:gi9h( 3xcxz power would be lost if the power were transmitted at 3000 V instead of x:9zz chx( 3giat 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 o2o d2qcb7d2 hk.kii 8440 V at 20 A. It is to be 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 power loss in transmission is not to exceed 0.010% of the original d27k b .id82ohco2iqkpower?

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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 ikw0uxle , hb2)n the coil's magnetic field kw,beux0h)2l?

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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 inducto.eb-17l;w(l)treq) rle g dker. What is this circu71 ted( egbkel)ll)qwer - .r;it's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC cqy7v kt-hj ,8fircuit 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 qq zys/dl4ho08yh 24.klfq 88l 4hjxvhev 6 t.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 64y miwupqt49 into a 120-V AC outlet. What is the resistance of the lamp?9t ui6qp w44my

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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. eoj velbrr6- 3r1z6 8v9u:ceyWhat is the peak current through the resist-rv3y v8ee91beuoj 6l:cr zr6or?

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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 connecm (umls( a-1:q)dymu ited to a 120-V ac power supply. What is the power dissipated in the resistor damy )l:ui(-m1m(qsu?

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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 resistor is*jyv,gddv +(: cf b,ep I=0.80sin⁡(240t). 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 ao 8ja 4fw/2;bt+lm.bqie a8c0* fljvn 50-W resistor is I=0.80sin⁡(240t). 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 ret .m x-l,(wcxo2 0zweqsistor is I=0.80sin⁡(240t). 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 orvq*a72-igla 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 reactanl;rq:h qk hv4-ce 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 cx l2i+; 9mrzw14.0-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 necessary for 157 W of inductive reactjv t)kqxd ld 39l7q34pance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC ateukc.yk+n u*) 3ugl(i a frequency of 20 kHz is applied to it?ekuuikcy)g lu+.3 n (*

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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, 6guenmztkz* q xz6fq*1v1 f*gmkv ow4r27h) to a 110-V, 60.0 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 react, p;rv8u *2pnxsjgp z6ance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 k*, ej2/ :b;fdqok jgxuHz?

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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 hxw; wzz ;+pzw+q4rlq0 ave 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 ca:: g0ref:tk.o h8pob x9dg 6ozpacitive reactance of a 0.010-mF capacitor be 100 W?8h6t:pxo fkb9 gg0:.zr eo:od

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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 an-vb)akc) is2;m .a f2azzg(kjd 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac se)/pr9 ajrld5 lries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive p9a5l)drr j /lreactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20- nzrdcxevh2(4a ).wr2mH coil, and 1.0-mF capacitor are connectv2w2hn. x(r4cd zer a)ed 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 resucfbn 0*evue6; tpylfdvn 0mga/1 20x,hl4 +jistor, 20-mH coil, and 1.0-mF capacitor are connected in seri6,f0t 2e1 lf0g;eunv n+uhx 0*acpj dvlmy /b4es?

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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 fb h*hkc:,z va. im,:+uuj;iz inductor, what is the imp z:f.u m*:hz ;+ ,vhaicibuj,kedance 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, wha tntby 77tq-ayx/ sk.4(+xyhwt is the p/q7 whanyytk- t(sb+4tx 7xy .hase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capa;,qk.mn1/nb)rabzqre; 8 ymocitor ,mmb) ;1 nezqy/.abkrnr 8o;qfor 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 isl,loly .ku /4r needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 H4llykr l/. o,uz?

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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 4)n61o h73w;+nk dt :ijv axmcu50-mH inductor at 5000 Hz for a total impedance of 40000ncioj; vw+1 dk) x7u:ah3n6mt 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 /qhbt4:.(p0jh:qtsmk y inx) put in series with a 100-kW resistor at 1.0-MHz for a to4 /0.qptky:h)h( : xibtqsnjm tal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in seriesl l: i*dq5-pvb4 ibg2b with a 20-mF capacitor. What is the impedancelg 4bi:dqv2 l*bb-i5p 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-j kx7nepz; ,nu e-p;63crztr7mF capacitor at 1.0 kHz for a total impedancc,kejr nzxz7t-6ur;;e n pp37e 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 capa72sms2c/pctm6fk - r wcitor at 1.0 kHz for a phase t2-m /sprm 6s2wk7cc fangle of 40∘?

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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 rg/nls*5,e/ a h. ddlizesistor at 1.0 kHz for a total impedance of 4a5, zl/d nlsieh./gd*5 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. Whgng*hv. 8q6vi at is the phase an.6 *n gvq8vghigle?

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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 resistor, 20-mH coil, and 1 8wzq:zi1i x6x.0-mF 1xi :wxzqz68 icapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF cappw 8.na *jqr,8yp)nvuacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz ,y .)nu8q*wpv rajnp8power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance m0fk2w4ttp3 o2)a rpg30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 0o34grattm2 p )k f2wp60-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 cir73r3yhn rd*zk2fq6koj+o xc8 cuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz 3r*7h6yxjrdk+3oc qo nk2fz 8 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 9t(8b /auhakn5 qd:x,2d rmig-fn. b bresistor for a phase angle of dn8(idnr 52 tba f/.gx9-: u, mhkqbab40∘ 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.;/e eo p;vk)xj At what frequency should the circuitp )kj;evx e;/o 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 output in an ac series circuit with 12.0 W resista;4hzcy(3v.g3 m2kov-:vfo ;ye ajhwxnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wevv z:3;cf yyvh.-4mo(oj g2h x3 wka;hen 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 circu 69r s*/hzir8lqdedk*it is 63∘. 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 y t-3 ,dfna eiqiu3/rl;54ptl an impedance of 60 W and a resistance of 30 W. What is the power factor,a/345 q iyilrf -pnetul;dt3 ?

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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 factdq6 *y6g4w /4 hgwwwzfor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ind/wzgw *wygd 6h f64q4wuctor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant qwll(t (t c*/+;x4yn 9td,dxkoav v3e frequency of a 1.0-mF capacitor and a 15-mH coil in series?tn9 /dv xtxc,ade3 (;vlkw*lq (+4ty o

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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 s b82pdh8p )mzq.rcm 1weries with a 4.7-mF capacitor for a resonant frequency of 10 kHzbp 8zm pr)m2q c.whd18?

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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 zago.g:o. j4.i;shlg a 3.7-mH inductor for a resonant frequency of 1000 Hz?.ioj lh g:;za4.g s.og

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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-mHt5v5fd.m5h w v7oz yzm 99hzs2 coil if the resonant frequency of the circuit is to be o d.f5hzyw7vmsvzh9 m259z 5t1000 Hz?

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