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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 uniyd9 vs9ihhqj/ yc)b--8l kmx*ts of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thai1fkvv7h z ; +h2oiz,kt 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 cha w:5smbtgu ) e6nry*i/nge on the /s 6 :en)gw5*b irumytinduced $emf$, 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 olov.jfh*gk lsox(+1( rw n8:zf the magnetic field through a loop of wire produces what kind of change on the in n(fv (o.o*8lsl k:1rhz+wjxgduced $emf$, 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 on the +w ;5nb3 :,lelhxd nkek*6arginducednelh w albn:e5k;,3+ *6dx rgk $emf$, 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 field a1 +5)y dbb9bqly ngo*+cv lpkg529izbn $emf$ 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 ia5xn3q3 1i wf ;jgr5z+c kx*sanduced current in a conductor will be tsc;faz jq3xg*na55i 3w+xk 1rhat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet inlhp sj83,(qf d)zm)f s held above its center with its north pole pointing down. nj fzd (3mfshql,p)8)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 istpq sguzk w7gx 2(38n2 held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abo gs t 2x7q(g8pz2wn3ukve)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where tbtbo( b- 9vrk9he magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, wh9r ob 9-vbtk(bat 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 field 8i7 hcm/jpz.l9rr w-r vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current9l8h-7z.m /rwjc prri 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 horizontalr a812 :wjnbve 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 as the field disjb1 2wa :8revnappears?

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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 carrrcgh4o)q7 t:1cc 8o tvies an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current c):crtoq8t1cco47 h g vircles

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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 -gma*n +h bxx/north pole entering first. As the north pole enters gxa- m/xbnh* +the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatmxb q(a1: 0wrqed at constant angular speed about an axis whose direction can be varied. In a region where a unif1mxa 0w( rqbq:orm 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 constant2fa5f jxai5y*h m,wn: angular speed about an axis whose direction cam h j5f2:5,ixn*wy aafn 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 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.wrqtjq;/ as8 av f;..z
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an vap jvi9;sz 8,$emf$ 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 field.zh vsv:u,b7ry6e ro*6rr s ,7o The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved no13jy( o mnuykt*rel (0rthward at constant velocity through a magnetic field that points stra0ryo1em 3(jltn y*k (uight 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 vel otpctos98uc;9s;u oi l1yy34*5u mfn85 sjptocity $\omega$ 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 yvbcd 5p;bb)u; b q-q+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 revolutions each secondkoqxb;df ;w6g bfc;;,. The frequency of the k ,;bw 6gdxf;qbc;o;f $emf$ 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 devicec gr6ze6-ezuw.kbqo cm.0 5a* 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 device that:cres uacx9 7+

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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 primar5;,mv lx xezie4+w ae 6d4vj8ty coiz5ve xjlt +a8,4;m6i4 ew vdexl 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 coi6 4b4 m z2qf tyic;woal.ghm(:l contains more loops than the secondary coil tgmfh.42az :mtq6 c4(ly ob;wihen it 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 power inp;+n)3z cg2vxhod8df put

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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 cird6vouo)xt q8w) h -:zccuit,

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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 battehofbm0x+ 1gml.* yr*gry of constant terminal voltage. At the moment contact mg0 .+lbfx*1or *h gmyis 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 inducqm*b*nspn6zrk*:e a g,yr8 m8zy6 6r55dlb fvtor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagenf5d a6qyzz 5bynsm:*k8m p rlgv*6be8r , *6r 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 inductance L and resistance R is connected to an f .lwc9f3a;xm*rk z 5m$emf$. 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 resistance R is connected to ank kgtc1rmc,i ( l(92yc $emf$. 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 connec w5mqxw++uup+3 xv :vited in series to a battery. The time constant for the circuit rex qivx+ 3u+5vuww +mp:presents 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 connec)5p8mukhi * ksted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the ci)h*s85k uimk prcuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uno5q qz8 q-7;uct 7 d1jd; tnek,)vphxhits 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 poo;b69 xxsas h6wof+ d/wer 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 rce mo0(t8fi )AC power supply. In this circuit, the curren c()o0ietm8fr t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by wfp(c lq xh;1e;0i /q mn3egj-fhat factor when the frequency is ci 0(elgj3x; / qhn ;epf1f-mqtripled?

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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 isg*/rs8x 8xfz6a2nxd f doubled, the inductive reac 6 f r*sxxz/28fxg8adntance 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 across an inductor approaches zero, the in*n;hyw fio;;x ductiveyonh;iw;; xf* reactance 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 ACbrm 1xlf-9sb3 power supply. In this circuit, the currentrbf391x s- mlb

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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 freq44yiqz1x,bljz9t ;jql2it 7vuency is tryzi1bt 2iq44t;l79 , xjzjv lqipled?

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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 zzl7t 48ldhtjbc0, jz ,ero, the capacitive reactance of thabdzc,t47l,t 0 jzhjl8t 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 vonb 5dzq2b0)ix ltages of the inductor and capacitor in a RLC series c d0x5iznq)bb 2ircuit?

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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 c t.ue :p*q8ubz*kjxs2ircuit 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 circuitq4p cvep xvc0v/ve*99w:(mf n. The impedance of the circuit increases if R increases. When is th(f cpmnpw9 /4vv*cee 0v:x9v qis 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 circuit increases ifbopu; eju/ 4l: $X_L$ 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. :n:gxc )2: wyod2 stskThe 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 caq .2qlme+zqu 25g bjo5pacitance both double in an LRC series circuit, the resonantjqle+ 52g u.ozbmqq5 2 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 v*ci cxdsk 1r;fr7p a;+o56od soltage. 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 c7 5jsq y dplxw0gtw9(kjx9w1askd y *)di(/j2ircuit 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 m4zpmao 7o8-0wdx8 kd rie 3;srotating in a uniform magnetic field of 0.20 T. Find the magnetic flux -w d r m8keo 47ips3da8zxo0m;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 radius 0.10 m is rotating in a uniform magnetic field of 0.2 qfe)vy+ hk 6ud9*xd: bdxp7i* 03tqwc0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetid0dtiewdy7uqq h)+3v*cbp fk x: *96xc 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 zva 4bo0k ph8;uniform magnetic field of 0.20 T. Find the magnetic flux throa v hopbz;8k40ugh the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustain0-9ckix ztqkzmi v q5l-;3v*y 8b9eble single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil ch:0od ;p:a1 ,:wva ci:jdcrishanges 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 sides 18 c/z5k2 wrrk iv0e:hohj2 fu6o9m. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the in2h596kie /f wj kv2ru rz:h0ooduced $emf$.

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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 with2fi)zo2)n+ + d jbmisn0ha 3ze 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 anpi ;0gd7axzn1 d area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m fli1bro*b7zvbo g: zf:z ht/k dw2333bn hes horizontally at a location where the downward component of the Earth's magn13tb7r kzo g/d wbhzz:fnbv:hb 3o*23etic 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 rotazl.1pp3 zx-xgtes at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its endp3p-z g .x1xzls while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional arpo/d k f*(1i q6h+ithxtd97 hcea 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 of hc 0-vc1nlke+w*, as j9y3: aq-qem svwire 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 v.5,x y(0zvcxyhg v *hloop 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 uniformhhvy(z5,vgxcx 0. * vy magnetic field of 0.30 T, which is perpendicular to the axis of rotation, 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 ofg (iax 0lal04p 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 constru qod;* v3jex0qih(wj3qaw- t;z8v0d78 asod xct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field odawdzeqsiq3-0o3jvxj; ( 0*oa8x v ;d 8t7wqh f 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 genera9;2 ehzhxzntx1p1 8-bf tnw1 mtor 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 az+43nu:hu td a resistance of 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 resistance of 6.00 W. The mo )4kbu*0y- i*rts vk5wzj)kbh tor operates on 120 V AC, and when running at full speed it generates atb yk0)iw)uzkh* - rksbv45*j 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 2k swr dtb5o (ud.6an554-V power supply. The operating current is 1.0 A. What is the start-up c5d5 bts6k.nod(uawr 5urrent?

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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 ++ryr ;w eu,pa- ufvq+to a 24-V power supply. The operating currev+w f- paq,eu+r ;y+urnt 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 to eu v4 z*ip9gllzrrq-8itui7 z ,)* b/fa 24-V power supply. The operating current is 1.0 A at full s ,8e)zl9t uu-v7 z/z**frqrbl 4pig iipeed. 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 v,+s:ky grrxwtwx ).8:kh0ab 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 prima(swyu) f9wja*. c3jtb ry of a transformer causes 14 A to flow in the secondary. Howj(t9uasc b.jfy 3w *)w many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns arv ppk6f) z7uc +a2fbau0f3s;be necessary in a 110-V primary if the 24-V secondar+fb v6bau07fu zpfacp;3 )ks 2y has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil ands6bcrrawk +f3;hpr * vz;1y6z/adss( a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in h3p zra 6/da*vkrs1rswbz6f; ;(+cys 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 m1;b7b7 mf krdof a transformer. Assuming 100% efficiency, how many ampbbm7fdm; kr71s at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0uhw 6:ln gsjkzhh g 7)cih(4(c9w.b4q mA. The primary coil operates on 120 V. What (4ghg hhq i.)sknbzj c wch7w96l:u( 4does 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 7xt)6-ikd*uhgo:d f j primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltag xjufd:o6* k) t7hd-ige 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 transformerkw(cgx:. fi 1b(g eo)k has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current ocw. ) b(i kgg:fxe(1kis present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Id,lz1a++)tz r 4n sajek0uklsz c2* 2of the input current at jd,+ nzlur+kk )la1t*zs0z2e 2a4 soc the primary 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 1002 vnd 9s1c:vb67jk mxn52hfgq turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can72dmjf2cnqbhvvk ns 61:gx 59 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 tran/v ksj ujp0*,csformer has 100 turns and its secondary has 200 turns. If the power input to the primary i/pcjs* 0jku,v s 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 120 V. The volta;,x imc pbux,*ge is usually stepped up to 4500 V by a transformer ax;pu xm*b,ci ,nd 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 of current at 120 V. kofpon-(i2- b nh c41uThe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage nb(fnu o i1hoc4-2k-p 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 12e6gv4p u/yyg ;0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not e6/gy4;gyv u pstepped 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 wqvc;a-88, rbyt cg 4mtotal resistance of 0.60 W. A generator pcmcg;a8vb trw 4,yq-8roduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not 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 lonh;k5ls* knz/hi i w92o )u0a*zosq* tgg has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100g wn k**ozzo uqi/*)athsksh; l9i250:1. 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. y29wna nf x.n)bz/2nr r)nhd+ How much less power would be lost if the power were transm)9 nnrhf 2rxb zwnd+na)2./nyitted 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 transmitted lwat4rqwosj0wug7 /2;6a l t)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 sj) rwg0waw o;tql7/uat6l42 transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How muh+ a2,vj :g r5wosw;toch energy is stored in the coil's :h2o, a gsrt;vj+wow 5magnetic 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 inductor. Wvjpf220q ao:tsq-jknq hq yu e3690h*hat is this circuit's time consta2hh: jyo- *6tq392sfp0 qnkq 0vqujeant?

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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 i zabcuh/,46/cx go.xrn 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-V (wp 3 3ashj 7dx9b4 r:qjykdq8AC 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 placs(x0 6 vy5mzofed into a 120-V AC outlet. What is the resistance of the la6s ov0(5xfzmymp?

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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 suppg/ovnrzp9 /8w+m f.mdly. What is the peak current through tpo9dr/vn/ m.g8zwfm+ he 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. Wxo5 h.k31x/4w2o 8 t acew)a1aofagkohat is the power dissipated in theooa a 4)okc1g3fk2a51/hx.xtwe wa 8o 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 y* lc3fy le/q5resistor 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 rebb; :t8 .n s 49bcjsicid,ep+zsistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W re1 8kotg1zl -uy05ls ursistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 16ohr6xq7k5:koc qs ;w : u-exj.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 of a 2.50-mH coil at 1000 H*(xvk* e2xmb o.xh( zqz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wivq/sq k wrrly;a 2a f)a-s*,i;ll a 14.0-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 necessaryyr a2mq489f)xyjus+(sb2o yo for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor wh7 asfak6 +m4rvut:o3ken 120 V AC at a frequency of 20 kHz is applied to avaosfk3:uk 4t6mr7+ 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 5 q6azqrmt yig3-3lvkm).bsm 77tbtv3p 4- iqto 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 reactance ofvug q71th t;8n4blm8p o2ep) g 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 capacitivij+bnlc0:z6 seiy ;;ee reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of aye:w)jfe )+ a1200 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-m3wj;stpu /-fl r/*znt* c yc2mF capacitor be 100 W* l-2t /yn w*rfsmtpc/zcu;j3?

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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 a1tfzg;jm z ba u-nzf8+-m)4d5.0 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 :b(exo+l w zt 1q5v9vsof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive v9e5l (:1+zvqtso wxbreactance?

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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 co l6w 6k16s.j.8 jgacu jpb1v0fh46pmkzeq7 emil, and 1.0-mF capacitor are connected in shf6qgk b8k1as m1.z6p 7w4e e6 jcu.pvl60jm jeries?

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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+uq hvu+qfq9 6 a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are+u6 9u vqqqfh+ connected 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 connec5pnp 8-h6d e9nuwgxd:ted in series with a 20-mH inductor, what is the impedance at 10008-d6pdxpg:95 wnh nue 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 inductb cawb7)h1 yw7or, what is the pha7hc yb w1)b7wase 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 af*s z0z+ot1d 1.xap emnd 1.0-mF capacitor fo.*0ax zmd1t1zfe ps+ or 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 i8y f/s, c (lsm8 fb wkrcj:c3u20ht/awn series with a 100-W resistor and 15-mH coil l m fw08(uycb:a2s/8skc /rfj ,twhc3to get 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 in series with a 450-mH kjwinubn ,+;n.2dy0v inductor at 5000 Hz for a total imp .2w+ijnbkvnn0,d; yu edance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be pute t/7 r0:khbe6sz4ug1 0dsxau in series with a 100-kW resistor at 1.0-MHz for a total im1:e7 kez rda460b0u utgh sxs/pedance 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 wiqk.7842 vbptq .lddckzqex78th a 20-mF capacitor. What is the impedance 2 qv8et.z . dck7xql4p8 d7kqbat 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 wio;-5iu s,qsp) cn klb1th a 10-mF capacitor at 1.0 kHz for a total imp s ,q5lnu)1oic ;-pbskedance 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 ser88xs kpuo +)xnq om2w+go4q q4ies with a 10-mF capacitor at 1.0 kHz for a phaseukowxmoqq+qpx os 4+8) 842n g angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neede 2u02,vk66 tod zpovpyd in series with a 30-W resistor at 1.0 kHz for a total im22v uv6dpy, oz60ko tppedance of 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 capaco2bbjk 933 9f inj7fufws:j 5fitor at 120 Hz. What is the phase angfk97nfb 2f i w:jjsbj3 u395ofle?

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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 qx oowi9453wu, and 1.0-mF capacitor are connected in seriesu9q3i45w oxow ?

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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 5 huoejz(v l6+of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is ( huj+z5o6 lveconnected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitip r3rc8lvp0j-wy 8drxeyp 1 :6ve reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to ryvld61 wr0cyppx p3j8e 8r-:a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cir72chdr - n 9vbw8t2dgrcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H in2 8nchtrr27gvwb -dd 9ductor, 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 z 1rth43dp1q/ w)mto* v krutm :mys25in series with a 500-W resistor for a phase angle of ywq: r42mvo md5t rt*)1ktmh 3/pu1sz$40^{\circ}$ 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 mFikyfjla3bsq3s b/( 0ls309k u. At what frequency s ks3fjy3a9( 03ub0q/ slslbkihould the circuit 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 ci hzk 51n(u m-ocv2xfi95hhu ,wx45ujrrcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connec 5h9hfcuu45uw j5x2 xr ,o(-vk1niz hmted 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 h;pz):hqf4 n dAC 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 rejs w68ivrbo+lsw)o9 . q5 :f-g6jmsk hsistance of 30 W. What is tsb6o: l wvmh8+o9 -sjg rfsq56k) .jiwhe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a serie.xvu*4uju uf,u4 3rt l zl1kg9s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducttz3v*jlux ulrg .u4ku4, u19for, 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 frequency of a 1.0-mF capacitor and a 15-mH coil in sej(x:,sp+s)fz g (qavfries?g ,:jv)x zf((fss+ qpa

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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 wiwyxxh /*-as wwicxy41 eio(1;a a;)veth a 4.7-mF capacitor for a resonant frequency oweaye1;)1(i;w x4ays v o-x*awic hx/f 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductou oxdq.yzvi:*s7lt 9h.pog1,r for a resonant frequency of 1.t q9o:7, shuvzp ilo.1*ygd x000 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 (s.6j4 ks,b+xv t.vze.w jljkplaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 H6lxvjsek v.zb,sjj.ktw+ ( .4z?

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