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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 of4+*9 asd ex8unw8 ldzr 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 induc+ 7cku)90q md-kyyct stion 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 loop0i4pim1p 3ved, 3+tmmjzjn7h9q2qnh 8upx0 ls of wire in a coil produces what kind of change on the indu2h 3n0z8 4+p3,tiv01j9 pm7pmu xjnqdm eqh liced $emf$, 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 ofx :ux*/ 5ky ntdi0lxp3bbq /nn+dy/ 1r the magnetic field through a loop of wire produces what kind of change on the induced :d3/+ 5x nxbkbq/l/tpu r dnyiyn1*x0$emf$, 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 ing j4kpbi2c 5 3rvr+y/.knu e4pduccpiy4 pn4/r3jurke2 .b+ gv5 ked $emf$, 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 7entpuxw, skl(6c 6r-jr/h k8 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 direc-irrwrx qp,. qy r/1f14d vwx4tion of an induced current in a conductor will be th- x4iwr,. 4/x1qr1d rwyqr pvfat 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 o)/iwk/;otum;e y 8i arn a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (wh;okm/ )ywii8;ut/earen viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above its;a9(b-g +idhesze /s j center with its north pole pointing down, and released. As ieahes(-z js9b/g+ d;i t approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table e)a.bbx 5pj*3:bvmjta:bl b j cou*62top in a region where 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 as the field fadesbm6.2aej vl*3btx) : bapbj o*u :bj5c?

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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 fiel yhco.p.4vo ,md vector points straight up. The magnetic field suddenly grows 4 v..mo, phcyostronger. When viewed 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 horizontal table top in 9 z/lxh8ib o9ogk(ya69 yn5lt a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewe 5 8lza bgoht 6y9/o9(9ilnxkyd from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wireuh g5n9nb (ctj)6 s7eo lies on a horizontal table and carries an ever-increasing current northward. Two (7o6 b etu9gcnsj5 )hncoils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loopdy*hy o,gn9v.cd9lve )p *,rr of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed*e 9.y*h)vrvldd go n,r,cy 9p 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 axis who 8k - wfb6cu gx/d-hyieo*jv7+se direction can be varied. In a region whek+* 6-ovc-eygfxwj /hi7db u8re a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constann-gpke/6d 05:3qq w4s tnakvnt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mustnvda/ q4 p5n3ge6 wkq-:nkt0s 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.qfuhnptd0;9 1
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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 thapgm . y:f r7a;*xyakgcx0e18 at 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 mag2x5bwbo 7/ yzinetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east- teszoz:bk 9g* fpo50/west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrossegz:p5o* t zf9o0ksb/ 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 czf pt*quqw 8 ;5(,pvsronstant 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 trrnydqbgz0 c x*2 g5c4: lwm98fansforms

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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 second. The frequencyo rr3ez0e*5gs of th*sz3r 5eg o0ree $emf$ 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 uswer6 f opdl,4(09+sr 9ogiowxh.ep :xed 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)2bdhy9aizden h9x i d w2m1:3 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 secondar w7q x+z t9uzgfopn68+sx4z:vy coil contains more loops than the primary coil thz nx zv+w:+p8 7g6fzuotq49x sen 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 0w6*ybx9fmg 6kdbz z(contains more loops than the secondary coil then z(w6xbz 9mbd0* gy6kf 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, thf n,4g 7xtf a3on-meoma+4 9hhe power 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 circuit,n) v/c;y;uhdm0ivvk,

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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 im:gt) l;q0b osv;be -hn series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thbe g) ts mbh0-:;lovq;e 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 btt4l4oka+ y u)attery of constant terminal voltage. At the moment contact is made with the battery, the vol l)4oak+tuyt 4tage 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 ankx ecss,uo:7v 7yh;d+d 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 resistance R is connected to ahfm6vy:ox:i (k k4-zln $emf$. 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 inductork,m-t8 g 70 db7sjmkpfrq5 ft1 are connected in series to a battery. The time constant for the circuit represents the time k7 pkm5mfdt87-1fqjsr 0tg, brequired 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 in28j umdzzxu3wd;p2 s8.m(o rjductor are connected in series to a battery. The battery is s2 (wzp jusm d82u;.r x8z3domjuddenly removed from the 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 hav gizd85js9mz 7e the same 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 connecttz8bl+ -y4omfed to an 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 connect+a qi-) wzag co -xo+tg)cdq+-ed to an AC power supply. In this circuit, the curren cg+ocqox)-i)t+zd-a-w+ aqgt

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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 x( hbq- 8vble1w*3av wan ac circuit changes by what factor when the frequency is tr b8ww1* -aevhb3q( vlxipled?

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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 is8hkvn+u ;+abm doubled, the inductive reactance of that indukn;ab 8 h+mv+uctor

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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 ly bb l o2e+30jyjrj)0zero, the inductive rejljy e)yo02jb 0 r+3blactance 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 dx1v6q l.web6 AC power supply. In this circuit, the currenxd1.6we b l6qvt

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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 freque)ebu bqu8cd vs26n4b- ncy bqn-ucdb846)bu es2v is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacito0*kv c:xy(pa rr approaches zero, the capacitive reactance of that r c:a* ky0v(xpcapacitor

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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 thixyzg(: 6uiz 0e voltages of the inductor and capacitor in a RLC series circuit6 igz(ix uz:0y?

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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 defined aa8kx 0/mvt1)xo d +gvcs $\cos M = R/Z$, 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 i);t k(2nl cwjk: syk;zmpedance of the circuit increases if R increases. When is this statement trls j nc;kwz2:) y;kt(kue?

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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. prd)4j(rbch p dwle,:;lh53yThe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The snv: v .g2fv,hy21kqmimpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series c/3xjtgxa-u7 2xxe iy g/v)y5circuit, the resonant frequ52jy xg-g vy/ exx7x3u/tic)aency 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 ap l6 un s1wn;bw;eh+r; bbie).cplied 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 RLcuw76gxxz+hrr 5 ; pr1C circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.4;i;r)rp +vldp g. vti/ hvq3t10 m is rotating in a uniform magnetic field of 0.20 T. F;h. /vl gqtr)+drivp4 p;3i vtind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m i u kegpm8) :q6bn-k(lgs 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 perpkb qk8(n-m 6 ):egglupendicular.

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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/w 2 qjv*zfdz v1o7nkz;qjshs*/s9: 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 an angle of qszj/ 7f: ksv9h1om*z * 2dqz vj;n/sw$30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singu i 6th+i0a9able 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 changes from o3ryyd c3w8*x (disb* $4.0 \times 10^{-5} \; Wb$ 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 turnsgy0 098mhu;i)iwy t0 tu kyfm4 of wire on a square frame with sides 18 cm. A uniform magnetic field is appli0t8g0ykfi)4t9 h u; w0ymy umied 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 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 wirevusp , pf0qj+) with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and are/ y h9qa.(n0on3xtte aa $0.20 \; m^{2}$ 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 on3 m)vuq z9678 irqhuspan of 60 m flies horizontally at a location where the downward component of the Earth's m) m7zuo3qr vnh698qui agnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constap-ro3b n/t;vr rg p:h5nt angular velocity of 2.0 rahp 3 vnobgt:p/rr r5-;d/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a genera7n ke)l;bf+e- bxusz 4tor has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of(wzl:yentc plvh2tem, 8a;xw/g:s0 , 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 $emf$.

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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 rjt6bl /evok f;f/9 zp7ectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates ao/jz9f;vb /flk67 te pt 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?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofjcr 4shw- (gm* 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 genera q y2oo gwh(p6* v7:dxhtpd*n2tor with an output of 12 V maximum when rotated at 60 Hz. A magnep*o*tnh (w:dqx o7dy2 gp6h v2tic 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 gl3,n91jc ow jgenerator 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 DCyxr 2/ x-1yfu2jc1d pl motor have 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 mozx) l,c0 h7bq t2i5xyetor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full spe0xhb)ciyl2qex5zt7 , ed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppl34 ghs h;ij2c :bvxj.dy. The operati. 3c2jihjx b4gsvh;:dng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected:.yq)h.og mr fp:5z ca to a 24-V power supply. The operating .:m hqagf yr:oc)p. 5zcurrent 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 a 24-V o-8 bt d;7;f3aemjis9jo1i -nn6lvx c power supply. The operati tc 1iofl-v38x;me-i6 79jjnb;oadsn ng current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage oo tk; m0sl,/nxf $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flp,q k3ha a(6k+v b9oc k)vdo*qow in the secondary. How many turns are i)d6*ova,c k+ hbo(qqak3pvk9n the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are-wdg5z wxjcue4 v+*ka1r 9/g u necessary in a 110-V primary if the 24-V secondary has 100 t49 w5ruav/zg 1x*u- +wecd kjgurns?

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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 and a 2000-turn secondardp(i+ a,ef; y+m1ivvp y coil. If the current in the second+ivp ym1ap+;v,i(de fary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a tran7krcb9,x 4es- kvb;)ru3b tde sformer. Assuming 100% efficiency, how many amps at 24 V can flow in the se; b-bedb49s7vkukt) xc 3er, rcondary?

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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 ooq g)6m -ft2kneon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the protf6kg- 2)qmo imary 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 6b 49fbf2t4,h +mkp r.rocb;lv0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2bv;r492f b4otrh . pfb+mlkc,.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns oml34 l tg1w,u ryhx6)bn its secondary coil. I)tu1r6h wx ,glbl34myf 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondarhnx* m5 hyv0;- )qa:ynzvdid8y has 200 turns. If the input current at the primary is 100 A, we can expect the output c5-vnxv*)amnydy;d hi: zh q8 0urrent 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 secotu5.nyg8, 6phjx+ wc+rz lu-sndary has 200 turns. If the input voltage+p65w+ u c g.y8jlsnt u,-hrzx 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 transfo:m9z n71ue jab0k a.4jvaw)cw:srd4g rmer 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 awrduzva aw9 b g)kj :j0mn1s:7e c44.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 70 ixyx5 y y5oayuy :1y6qb blaa.lq11A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer al0:1q yu 1 oq5y.16 xaaylyb5ai x7ybynd 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 cwi 2.suxwwujbdi5l m640)6 acurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tota6d4xsi0uwu) 6jl 5bw m.a2icw l resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuall :q hl(pm*e.t*gp8wu)jsm-voy stepped up to 4500 V by a transformer and transmitted through a power line of total(u: p me8wjmgs-oh*l.q *tvp) 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 W.+i1g;az2q3bc p6orp yvw35z z A generato1wp36 gbz p3rv;iayq 5z2co z+r produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not 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 resistance o5pf;5 ode efj1x;a:)l xnx5bx f 0.60 W. A generator produces 100 V at 70 A. In order t ax5f 55l1p)en;:fbdxoxe j ;xo 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 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 1000pi0lu;u,ll gm. vl-a: V. How much less power would be lost if the power were transl-i l0 ,;ulgm. :vluapmitted 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 on a ltqp+j x (e dq3:jxcw68ine with resistance of 0.60 W.jcx3x:w(ejqd8 p q+t 6 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 power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much ene.8h(r,1fhi z oogm7ek4j8 vyfrgy is stored in the coilofv4.f8 (1oe, hzri 78hyjmg k's magnetic 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 cont)cpmr10/ f7jmbny . ctains a 6.0-W resistor and an 18-H inductor. What is this circuit's time fm np7j1 cb t/c.)0yrmconstant?

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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 circuit where the rms voltage is 1c pk)5 n;s0awmono.d / fzw2y-20 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. What is thel3gr.8d dsqv9a9ip9s3 (nzbv*obo v)gc7l6 s 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:w )):pp(umia4f 16srg fmx2r5cu c 1zqb,xh q is the resistance of the lamm5p2u1 f)cmu(x pbsq61iwrc) hqafz:g4r:,x p?

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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. What ygt/1o*3waaz khdo b6x/*p+o is the peak current through tdh/p g w *t1b/axooyz+ko6*a3he 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 powe1 wrcv6)7phbgyt2i +tr dissipated iv 7+t1hbcyiw)2gtp6 rn 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 resistor is cim)k.8t g/c z o;+w*fuym7+bjye v:q$I = 0.80 \sin (240 t)$. 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 wc(qm,jfgmps; ba 8c-45egr9a 50-W resistor 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 rekb8jwfe237bw1(q rl vsistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inducto3;ic1xl 8 urthr 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 cv pn, uv.8x2u7 g2 zbalyht.0joil 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 qwo* : i;-kxm.2e sueg14.0 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 r kt7h5lw l4xx.ebrhvu)5k.h4 eactance 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;od eqerzodnp 8-g325 a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to igr qd zpno;58-oe3d2e t?

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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 Hz soug.vop)1e )pbveb9 h sy8cc /7dt.qth;rce?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor aguy1h7k7e:z z f8swd1t 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 re,( ;ifdil3pj 4gbn 2nczh5k 1eactance 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 haveq,z -sunz*tp ) 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 capamd.xn( 0ljfm.d m1n2 :yps (gn8 mnl0mcitive reactance of a 0.010-mF capacitor be 100 W?mpmms m jl 8g2n :.dfnd(1yln0. x(mn0

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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 a6sxv+ 4 ozfz.xs)1teand 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 series circuit with 12.0 W resis 6 l:ddv(;d7x datwx7ptance, 15.0 W inductive reactanc 6 d;x7awtl dvdx:d7p(e, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 10*4y ,,r uu3tpax,14rqtrvi wp0-W resistor, 20-mH coil, and 1.0-mF capacitor are conn1 3tw v,pp*u rr ux4tri,a4y,qected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0j4c8j5m im8 hbq+t4ncpt mt5.-mF capacitor are connected in s t t 8.+p4q5m4j8 htjinmmc5bceries?

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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 /+9ivb v3l78gxvoq ;tekjl,zddr7 :pa 20-mH inductor, what is the impedance at 1te 7zl;vji:go3 kq98rvl+v b7/dd p x,000 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 qz0m g*3 :cbpla 20-mH inductor, what is the p*p3cbg qzl:0mhase 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 cah1j.nuj4rhk) ojzp ;.pacitor for a total impedance of 100 W at 1500 Hz?.1p)jj;huj.o hnr4z k

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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 wit9 td dhlv1cs:w2) us3ah a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?vaduhls92 3:s 1tc)wd

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at zf v8,ghr+) ik5000 Hz for a total impedaki g+)r8 zfhv,nce 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 put in series 59f(:0rvz vuowjp2xb with a 100-kW resistor at 1.0-MHz for a totalb9vzpu( 0r:v5 ojfw2x 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 series with a 20-mF capacitout/)j7pswfv+- i,twffg 7j frb3r+4or. What is the impedance at) p fu,v t/w7f -7 fog+wbijjf34+rrts 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a totab x32. -blb,v kjajl/wl impedance of 45j jb x3abl-bkw.vl ,/2 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 for1z(a(dhje2t bucz j m1 //fiqql* 39h-a*gsob a phase am ghe(- j*zb/132hit qz sf(u/9lo1*djc q abangle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W epjt+t.31f zfresistor at 1.0 kHz for a total impedance of f e3fj .+ztpt145 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. Wh*m/vpeo.uey ) at is the phasy*e)omp e.uv /e 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-t qg2:gw)qdl / taw6k:W resistor, 20-mH coil, and 1.0-mF capacw)gkt:t/ 2l6w d:qa qgitor 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 capapf m-qiu:ljm:vi pgr s1,t7 4+citor, and a 0.35mq pi s,t14-g::v pm rlf+jui70-H inductor. The circuit is connected 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, awmthj8q+ vs m)(+rel: capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in (jsvlhm)+q :w+rtm8ethis 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 circuitr c6k g/8c iu1zi2gx /s:rot,h containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induiu8,2 ht sr:/ rkcz1g/ xgi6coctor, 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 6cyrh e9./2 ghq54v rfevm mw;series with a 500-W resistor for a phase angle ovw2.4meyhqrh6mc eg /;f59rvf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At wh in2isx+ 7bph((q1ip zx fb*v;at frequency should the circuit be drivqs z2;fx x+((bv17 *pbphiiin en 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 resistance, 154i yl6v 4-xvwx.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectey4-iwl 6vxxv4d 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 a(45fg v pxr4oln 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 an)q9 bt 8kxom,hd a resistance of 30 W. What is th xo)mb9kq 8,the 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 sc*kqel - ofv1ua4)q;f eries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz 4lq) qeuaf1*-cfk;v o 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 capaci yow xkkfnmvpnr,an y7mnn(l+8 ;;645tor and a 15-mH coil in series?l,;pm(fnkoa+r xnn;yk7 yn6n5 wv4m8

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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 resonant freqp29;nhn 8iigx ud2nbd+k nr40uency of inhi228 nk+ xr4gbn0pud;d9n10 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 witt,7max 13oahbh a 3.7-mH inductor for a resonant frequency of 1abx hm7oa1t3, 000 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 b*.w ,kiv76h rww(d x+o uvqt+be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequeqh v+ wd+ ww67bxi.t(vr,*kuo ncy of the circuit is to be 1000 Hz?

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