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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnejbpets77 cj4w .j9 k+wtic 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 inducdf;;() ozdrg ption states that 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 change e92r-z) pisa1wlz-i aon the inducedea)z2w91a-lpiir s z- $emf$, 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 thts tvak6.maa 42nn 19ie magnetic field through a loop of wire produces what kind of c 26atnm.ivn14kt a9 sahange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change ovhx)rh9 1 du)z b;bn3tn the indu1);9tu)3vh rbn hbd zxced $emf$, 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 magnec-wfbx)/h+h4y 0xe h wtic 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 conductor j+w:q nvj i +gkc(uy0-will be that which tends to produce which of tv - j(+jg:cn iuqy+0kwhe 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 bar magvs :f.4f 7r2 w**tjo ncxkkxe7net is held above its center with its north pole poinof:7sf j4crw.x x* kvte*k2 7nting 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 flq*t l6.yrt f0gat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed f.t y*t ql06grfrom 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 acv i8x0/fyd7xc e/ g/ts /s/vi table top in a region where the magnetic field vector points straight up. The magnetic field t/x0if/8gice s/c dv/x/7 ysvvanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fiyihk2y(- sv8qeld vector points straight up. The magnetic field suddenly grows stronger. When viewey (82-ivhkqsyd from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizonta6vg.akzkd00lp h lv;k4/pgi,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 induced current in this coil ask,d 0/ igpk6ah;v4vl0zk g .pl 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 r1((we/dq 4kmzt 4 fed0sd jotfd9;h+ lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire d/q;t herf41d4tk(o(d+z m0s9ew djf 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 with the north polzc/s3av1 oqa *w )+xkpe entering first. As the north pole enters the wire, ko1pza+3) /xaq*cvswthe 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 rq3 *2 sqeln14lx ke( luk,ry6kotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis 4k ll 1kqkn2ueey(6s,3* qlrxof rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an a a6pgg wwd:*x*/7znu yxis whose direction can be varied. In*/*6gaw w:xgydz 7npu 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 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.uq eu( 55qvid*
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that akk5:m-a+.v3k ai u hf )qyfju;n $emf$ 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 magnuca r ,845m.x0v hbfctetic 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 e/deq1g ko( 2kuast-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the poten k2gq(/uo1ek dtial 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 coxbn91eev9 t6p at*xg*y31v gtnstant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfo,o9 +pll90.zy m dvyenrms

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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 x:zzmfi7cf+d8 p9 3o4oyu pq;e6qw m -2; ihojrevolutions each second. The frequency of tmf8jofm4qcizeh;3 d+:7i2 pxuqy;p9 zo-6 wohe $emf$ 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 w3qtf 3. oll (ia44k6b6 llzapfq(9qrnpm3x. used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devobjos. 05ikz 6ice 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 loops than the p-pkg72q)w;8hhwb 2*hujw skcrimary coil thew c uwws h7 qpjh*8-k2h;g)kb2n 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 loops thanr; uf5 xaoiygay .-q-r/0o/ yy the secondary coil then y-oguqoray/- y 5fyixra /.;0it 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 rx2cxp g s8k* 9emv3ps *v(cp12w(dtj,bl t(wpower 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 k4 7/fd/nti7ksyvk6 whs28if 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 arer1 u l* ;3+msfh 21 m/ymrwjv2g0nsrus connected in series to an ideal battery of constant terminal voltaj2u+s;s2rlummw 3 0nys*rg 1 1fv/m rhge. At the moment contact is made 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 connected in series to an ideal battery of consta2 simgl2s 1b/ont terminal voltage. At the moment contact is made with the battery, the voltage acrosgsm 2so/ibl21 s the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to aoz gu) hs d6qx90ie*q:n $emf$. 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 resistanvi7. ljir2as9 ce 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 3uhp0 e a)9lvi0 2f0nusf7prgare connected in series to a battery. The time constant for the circu 0fnpsfu vprh)30 90a 2eg7uilit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battt7o1e pj14j vsery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the14jo 7e1pjs tv 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 samek 9)n em;nsgqx z1m--n units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On tiwaac79o6 )g 8h wwz4uhis 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 connect x og,c/(u. qhe9ambu1ed to an AC power supply. In this circuit, the currenu x1/ge mb .hq,c(9uaot

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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 ymnr//e(*(y zbivpb (the frequency is tripled?n/vi(eym(pb *yr /(zb

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the xkuj1t(smqd 4h9a09kd6 rwev*cp71f inductive reactance ox7d90 ejk *hump r94sfqk1vw(a1c6dtf 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 across an inductor apprpb 57a3u0)ouovw/x m zw f:ki.oaches zero, the inductive reaczmba3iow.w 7p:uukx0vf 5 )o/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 th /wqgs)h(j 3ewis circuit, the current(s)hjeg qww /3

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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 fre:*b*1uvnv r02xjxnk x)l8l by3,l cna quency is tripled llc8vx r1ax jnn :0n3*2bbu*v,l)kxy?

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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 ay ,;(v l8 re. wg1dsd:ctkioy, capacitor approaches zero, the capacitive reactance ofrc:(iyedld , okg.,ty;w s1v8 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 between the voltages of the inductor and cap 0lgis- nj 7cf39+ouadacitor in a RLC series cirn 97 iudca3l-osjf+ g0cuit?

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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 defi ;-ivwq3x 4llvned 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 circuit increases if R inc a2;n3 rgj0.uu exsg7sreases. When is th j72 an.g3sx; eugur0sis 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 impeda8suup:3zf :g 5a.izyr nce 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 ofc8p60 ps dipxrp1*p;fpo-c bx*j70-s yf gcz1 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 c1p aq)ci4(nw69e4j vjmg- gk lapacitance both double in an LRC series circuit, the resonwj4 a k )vlmpcq1(n9e6gjig-4ant 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 is driven by an AC applied v4eut) uy( 5u 3(at.i8ak s szlebg(d0ooltage. 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 circuit occurs wheon;eo )jf ):cen

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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 uniforvzyt4 hn:kl q.b0o+2xbu 5*khm 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 bo5*0htl2nyzk 4.v+:xkhq ub 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 unjn2-o*,l h.qin;qfhvj l *g4yiform 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 perpendic- g;4iloh 2qq **jf.jhn lvn,yular.

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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 radp3 * 0hik5cjxs(n(z: 8 pimkxrius 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 are at a0sk3 p i(xm xink8c*ph5: jrz(n 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 adju*ro+ w4pnx fny28thgs 74io)e stable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a c m s+rt7 x w7zax79q ;osylhs;k574rwyoil 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 o ;;wc(8xzkxu a hck:c40r.ex 200 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,wek .c 0cx aux;zh4c8;o(xkr: 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 area o;6cn95mc de .xwg j5pd0;ubgm f $0.40 \; m^{2}$ 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 a) ftecep4y ;k1rea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a e5zryf2 u/ xa2location where the downward component of the Earth's mag2z2rxa y/e u5fnetic 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 nee+s0t 0b7 vorotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetivte+0 n 07bsoec field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectionn uoa4jc s5.x-al 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 100 turns ofeeehyx(02 e1l 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 12u1o+wfbck+ 2kb, b6r etz6)r d cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?c e) ztkr fb6b21+6dokrwu,b+

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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 1005q w+j:2n(- khhyzvie 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 simple AC )10b1o dt5bfn x3erpitgyf73 generator with an output of 12 V maximum when rotated at 6btx3 pf7iy1roe 53 gfnb1d0)t0 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 generator with a maximi )8xu 7vrwy /1jwftlp)uz -+gum $emf$ 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 ofujs(nr0ugip576r m4v u9*pgb 6.00 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 resistanjq +3lx2.bytcf t: 1jic :f;qlp-yf8rce of 6.00 W. The motor operates on 120 V AC, and when runniq i:; jtclf281+: fyxpy.l-f3 bctrqjng 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 resistanc a4 8hx*01onkkx zk;5qd) kqzae 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is 8qkaqdaxh kkx5z 4z0)1; n*k othe 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 3h(q/ykg48yf3lnvc pma4jm( a 24-V power supply. The operating curpf(mvqygc 8nk/l3j4 ah3 4 m(yrent 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 resigw.oc /g+ 9vpcstance 6.0 W is connected to a 24-V power supply. The operating currengwp.c v/ogc+9 t is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce ai,m 56 c7 bs y+5m:fhzmofazf/ 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-turnfwz svly)p m(m(k0 3howt/65m primary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondot 6() v5l(swkmfm 3/phwz0y mary?

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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 trb:( vm p.u0g2 nz;xchurns are necessary in a 110-V primary if the 24-V secondary has 100 tur:xuh 2gr(vm cpn .;bz0ns?

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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 500x zd5b k,ojl *cce) (8a4tshv2-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current5cstkjx2b(,8)4l zvohad e *c in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumi* 5zgje1anea .ng 100% efficiency, how many amps at 24 V can flow in the seconaee .*zj n15agdary?

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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 tran l4b /g-alax:hsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What ga4/-:lal bhx 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 coity svsw-8i-5sw g/k w3wa08ujl and 300 turns on its secondary coil. s-wv kswa w8/j05ityw-8g us3 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 pra5 xz,pt sike bd(8(*ximary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presetxeks *(i d5a,pb x(z8nt in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2ce3vnemy1 r*2alq0.s5yx mk3 00 turns. If the input current at the primary is 10 el03y.*sn3ac xk1r5mme vy2q0 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 an+vhmcs74+ u.h)o moocd its secondary has 200 turns. If th.mo)ovsc+h7ho 4u +cme input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfj7e w0q-5ki22m 4(5cisu iybwe6 bc+ic1xgr normer 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 secondary to be (neglecting frictional lok6e50s 5i(yq1-e2bunw gm7cj x2wr ciii4cb +sses)

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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.vvoc(r3hitgm,f1 3 s7 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line 7r (vc,mofhv 3t 31gisof 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 of current atzv)(4yo m(hdkn 3+horjl8k7o 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistav (o l4yonk7do ()8mjrhz3h+knce 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 curreneyx mpc7zp-9k2a sk0gg23z:z t at 120 V. The voltage is usually stepped up to 4500 V by a kegx3zzy0p9 kp 2 72:agzms-ctransformer and transmitted 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 resistance of 0.60 nkp.lh p67c2 n xj(-q 4eit+fwW. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissiecq2+n(f4l7j wi xt.p6h knp-on 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 resistancuyg:8ytwzv 6*fi.2 hvnmc 4,u e 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 transhg 6,*y:ft.z c mivuvwny28 u4former 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 linen w))/cnfzex ) at 1000 V. How much less power would be loste)w z)f/xnc) n if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transi 6 359 *bm(gvueqagcmmitted on a line with resistance of 0.60 W. To what vmq3ea6img5* g (9bu cvoltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 52no, wncsk qm,-/b6qe 8ox (um.0 A. How much energy is stored in the coil's magnetie,kb/2,nu mn-cq68 qos(wxo mc 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 m3t+y6p-vcy/hadyqb5s5; lotor. What is this circuit's time coyq h a3pycvysb /m5o56;l+td-nstant?

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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 ma )n(;pcc i -q7(fyhccircuit 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-V AC outlet. Ws3.qdcri( p 6bz6 fbge+h1wk8 u ah(5shat 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 t pcw02rz 7,eoghe resistance of the lamp c0e2zpwr7o,g ?

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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 ak3+z5pzl /6e; c.jz ou pn8gup 120-V ac power supply. What is the peak current through the; l+ujp.gkz zn/pz8 3 poc65ue 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 powegld0:mac6irf8h+4 dogw )rp. r dissi8rm)4g06if rhwg.:d p+oldac pated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W an3edt1ntd.8roi 4+h 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:kt 2cen56h hr $I = 0.80 \sin (240 t)$. 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 is *jmvv-)i b xr*kot3e+ $I = 0.80 \sin (240 t)$. 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 (z c-ys*kq:;smmj6jb).hs b 8lde(kf e of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance hzvxndq2 d0f . :*6mpbof 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 have 14.0 W of inductive b-bj8 -)qa6o9jiw fla 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 u gsd5.m;hcf;soxdr6s4e5m4 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-mH inductor when 120 V AC at a fk9*qyk+ *zj.hr2glb ur* gx+frequency of 20 kHz is applied tolyjg9 . kzx+*g+hufbq**r2k r it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 w-as ev4(3byn 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.cg8b3ln4w( 2xe : ck5x5dteqr /2qk no7-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 toleyd4 ;a719 .mmnnors /-gts y have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have djf0e 1t bho.iu/)/zut 18ywma 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-m114w mst,apdrk )3piu F capacitor be 100 Wa1i wd,tupr3 p )1m4ks?

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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 thr4;tsj ct/*i3n;hdk m wough 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 angk:n)n*hd3p btq * w;ox0kr si: 7-kxr ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacit*nb:7t 3; kp)k :i0sno* qwgxk -rrxdhive 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 resistor, 20-mH coil, and mzie8j *yy (q61.0-mF capacitor are coei6yj(m8qz* y nnected 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 i,pop(/qi7ru bm-.ajd lt( s9i8c:ibHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conl( bii bp.(/matp:j r- 7udos8,9qciinected 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 f12qt rxlt3n8 f31vrmimpedance at 13xrnmvttfq18 2 rf3l 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 ind vm; ljk qh3+5fcw5o( b2sh+wdfy. 7mhuctor, what is the phase 3( obm5 y+ms. djw5hlh;fhqcf 7wv +k2angle 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 copj qxz mg(vj/9lr12nqm (9d/w il and 1.0-mF capacitor for a totl(1 v 99mxq (gmw zrjj/np/d2qal 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 100pn3t)* (nud; xqkzej7 -W resistor and 15-mH coil to getjk(nuxz* ;7e3pqt)dn a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put inm ja af3w2g3d; series with a 450-mH inductor at 5000 Hz for a total impedance o2;gdmfj3 3waaf 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 100-kW repd .tei-0jkmv8l/ ym eo+5/qesistor at 1.0-MHz for a total impedance of+oi8y 0d lmtekem/e/-vp5.q j 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 d7 jw5:ab: tb:ho3awfhxj 44o ,ettw7 with a 20-mF capacitor. What is the impedance at 1000 Hz?aw, e t4w3wo7b:bj7f5oda j: th4t:hx

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a to1 .f co,uwcvgg4ae5h+talcgf.+geahwvo ,154uc 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 a phas2vy7/ k*fa1 jlznyrroc6j :hv9dj8o;e angle of8zjva2 d: o;7r 9jj6lcrv1kyf*yn h/o $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is n7xefe:ev +v s h+,rg-beeded in series with a 30-W resistor at 1.0 kHz for a total impedance ohg+ v :7+,eefsv-exrbf 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 anl 8m87ddqjxqm-3c e;)y ln9ct 120 Hz. What is the phasem lq8x7e9mn;)jlc-cq3 8 ydd n 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 if a 100-W resisv kuj57z :l4gytor, 20-mH coil, and 1.0-mF capacitor y4lj 5:g7zukv 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 r:rm5:e6k ,5mptdt uuoesistor, 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 p5 umkm5t:, d6:uetrothe 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 reactanu:+:w -(xl j7njykd0rqhuk)xce 30 W, and an inductor of inductive reactk: +kj u:hx-x)r( wydqn0j7ul ance 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 ang4q6 1uupo;yxm le for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0. 1ypq6 mu4xou;45-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 necessary in series with a 500-W resistor for a phasr*meag40pw-u lyw, r1y :5;qzubzd e:e angle ofw,ymg5w1buarz4::reeu -;0 *d pz lyq $40^{\circ}$ 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 mF1njd7k4tzopobz ye; 7/x; hl/ . At what frequency should the circuit be driven in order to have maximum power transferred from the driving s4z /bzej7o dk7p/ytho ;x1n ;lource?

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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 civlqv3ojz g 2,)dys)c /rcuit with 12.0 W resistance, 15.0 W inductive reactance, j)lg3/ s,ovyq)dvz 2cand 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of a2rb7 lk- 6okkjn 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 of 60 W and a resistance of 30 W. Whapv 21 7pir8:x r lngvn1ze27upt is the power facto pr:18nngve2irv7l ux p7pz21r?

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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 ser7 fqra1pcszh 5y,h hm82n2t *ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power q 8 7np,hm2yatfrsr1zh *h52c supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-4o 3bs nq:3p:g 5/frrbgiuo9emH coil in series?oougb re3/b5:3q:9r gpnsf 4i

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonanldwcu.l3k i70 t frequency of 10c0 l i.w7kd3lu kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor .xtq. *- rhjmgm*w* u5v ntkv(for a resonant frequency ofxm5v wm*- ru.tvnthgjq *.k( * 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 series with a 30-W resistor and a 40-w8pqvvzu in7t/ , cjgbi-b8s 8:ed n*.mH coil if the resonant frequency of tqc 8n td zn/ 8ibv*,i:js-epbg8u 7v.whe circuit is to be 1000 Hz?

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