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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnet +v1 pr:- gmbom pk)qc)zz9f-gic 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 thatgte1, *dn 6laf 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 looqw3ofm8 3)x n)oto8 raps of wire in a coil produces what kind of change on the inwtq)m8x r3o f3o)n 8oaduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a looq gs )nr/ 7jt2.krgqj2a/op a8p of wire produces what kind of change ) p g7a/ orq/jrj2ga. 28kstnqon 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 on the indufo08ir9udh59.r8 h c k uh)dhmced0ru8ddh9h)c5ok8 i 9m ru. hfh $emf$, 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 magnetizn fo-pmaifa q,z1g- e5*1yh.c 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 direcs7dthawd9v)yab09 /ln- me6ution of an induced current in a conductor will be ttm 6 9- )ew7hbd/l9vasnyd ua0hat 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 is held above itkb ,((lu 1 dqs*zpdbp.s center with its north pole pointing downb.1d kdu(,zql b(*pps. 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 fv7d qxxr4qpe ssd .:bxu9.24table. 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 vs 4sdrx9:v7d.x4 upeq. 2 bxqfiewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region sfq )qy k;-k-*. ao3vmubj: mdwhere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, vq- a:jokm;)yf -m.kqu3*d bs 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 mg /yqlra3s 8(s;cl9lwagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced curren;l( 9qly8 gl/racsw 3st 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 tj :wn:jy.f ux:able 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 currey :.xfnuj:w j:nt in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carriesxig7 gjps; f0phv8i 33 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, 38h7;3 jpi gvxi0fspgthe 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 tho4zo- k3rm *v l/.et:n2 8-debvly ogtrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current wnkeogve /mb3or tlod*48v -.z2-yl:t ill be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant anm,kv7 p wp*7/n)sc)q1 ury sk 6actdu3gular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straightd *usrpmwk1s)n3ua67c/v k7qy c ),p t down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angularp2m,py (z;.kouro zy 0 speed about an axis whose direction can be varied. In a region where a uniform magno.yr(yu 20z; zok m,ppetic 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.yjj/fdtuum- mv y69 .-b 8nr;r
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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 thk 0hu :6 cj5sbh4k3pgmat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. These;,w d( esrp( $emf$ 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 vy :2 gkp2k1mlnorthward at constant velocity through a magnetic field that points straight down. Make aplm 22k1:kvgy 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 bxn4d6jhj6 aj; jab17y ar rotates at a constant 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 -xk 6 )qkterx;b 4klz;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 second. The frequency of ,llalzw o7oprfdoiuhj--)lt 5:0m (cy; *8p zt;zifluop 7 *0lo-5w:apdlc(jyot)lr -m 8, hzhe $emf$ 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 used 8 klt 6 4(irx3htwmdo+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 devmr0)msquo lk1y93/ dcice 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 morej:xtaj u9fbn74bc +2a loops than the primary coil then ijfj9 ta7:b2cux+4nab t 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 than the secondaryki)0gffy 7p g; coil then ifkgyi0gp )f; 7t 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, thejuat*1.e- j0e*.awp we.gdo f 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 cir/vha8 vooe k0;cuit,

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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 ideawi z 31e p0l6yxm+1qqgl battery of constant terminal voltage. At the momenqx1w6zpe y03+qim gl1t 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 sereahz*xz +6b* cw00sjfies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor isz whb*z00cj xs*a6+ef

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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 c3 p5bie5k.1;di0kz dxk6e8hi,ohgbresistance 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 resist 10ubafqih/gbuq a62u4.a 6stance 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 inducteig jovzyr --09v(xs9or are connected in series to a battery. The time constant for-o9 r(0 y-j9vszvegi x the circuit 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 baj 8v (itnfb,5fmsx5r3 yk y4y.ttery is suddenl8ysyxm,4 vt(bf 55jfn 3k.riy y 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 followingova+5*l n t:ir have 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 connected to an AC power supply. On this cjma d ygcckv2s.85x5/ircuit, 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 8d(l7 5 c.zqab-2 ey8qtpgjmv 5gu2uked to an AC power supply. In this circuit, the currentb7-(md eplzgc. 2u58a2v5uyqgk j8tq

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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 chang,c3k4h usg,e lo34rgahn/wy *es by what factor when the frequency is triplede3chnwgl s,4r/uygh,4 o3k*a?

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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 inductorcb 7)9rv:t dhjq)95gsnrjn pe 38pat: is doubled, the inductive anq3 8sr t)thj:d5gj e9pvbprn):7c 9reactance 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 inductorq7 ww- qw7ecpb,1f7pp+xj-ix approaches zero, the inductive recw7pip pbq -fq,jxwe7w 1-+x7 actance 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 s gh a)0n; c68)n6lpdk1d9rjjn6r wnwwupply. In this circuit, the currentgd)n0jkwnh rjnp 8wla6c) 6 91 rw;6dn

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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 factpypfl*p pedz6 k()p h63k97x bor when the frequen kh kl7pzx6pb)pp3p f*(dy96ecy 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 voltahnb(iw*1h zx 8ge across a capacitor approaches zero, the capacitive reactanc1x8nzbi* hw (he of 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 voltagal:zrp ; 2tje;9zj* zdes of the inductor and capacitor in a RLC series zjtlj *;d:p2 r9;zzaecircuit?

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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 circ7ghsa n3l6ck 3uit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance5o,sydl / lswdves)-, of the circuit increases if R increases. When is this statement t, y-d/5dsv wsolsl) ,erue?

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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. wrrk k (nkg/yam0m52 4e1/ehg The 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 ciu-f9o ,bdmv4jrcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance botuph mwgi(rv1 /,(box+h double in an LRC series circuit, the resonant frequency of that ci,(b+r i/m1p w ghou(vxrcuit 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 a*rp, 8jh8 (a k0swz/g:xwt dwan AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whenuzzr3i yej13n;k i *j,

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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 radio faa*c l5oy(w 1fa;+hus 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 magn5*fc 1a; (owyflaoa+ hetic 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 field5hl js4 (rym0a/n kk;t of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the m lrjm;t/h0( kk4n5ya sagnetic 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 uniform magnel. e/9-sxxqc onu4g -ltic 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 anle x g/4c9--o.sxnul q 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 adjustxu4 ulyhad7e3p- b ;u0able 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 changes from m h7h9 -c5hy(p wyyf39- qvdhra +cub($4.0 \times 10^{-5} \; Wb$ 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 s/ 4uv g:.qapuw:i2ch ** ectglides 18 cm. A uniform magnetic field is applied pee:ughcg*t *w4vcq:lpa /.i2u rpendicular 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 wireokm(nx 1z0lhp e7i2/ o 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 area h gld4x 37gq8o$0.20 \; m^{2}$ 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 y p),xn 6muw-zof 60 m flies horizontally at a location where the down-zyxwm)u6 np, ward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0m hgx6p+ 3ueay 6q4*jl m long rotates at a constant angular velocity of 2.0 rad/s about a vex3e 4m uy6apqljgh*6+rtical 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 generator has 5g q/ 5zpu7mzayf67fvofu); q) 0 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 ofkq xgt(e 26e6c9siu -c 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 rectangular loops oxl01wl pcq1h:yh w jr.-)i s)en its armature. Each loop is 12 cm long and 8 cm rwl-i)lqe:hh 01y.w jx1 )csp 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?

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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 j.;j;vq:r)v;vf wkcc 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 wis5 wcv-p.u ox.kyyi( w mth2b*,h to construct a simple AC generator with an output of 12 V m.5ycww.v kxitmb- ,huy(o 2p*aximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum l c 7bn 9k+8b+qw1t)nilk6ylc$emf$ 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 me jb8ex7;r )/hhnpc,k otor 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 motor have a resistance of 6.00 W. The mfo*3yb) 85z: cxrmben otor operates on 120 V AC, and when running at full speed it genef8:3bmnc)r*5y b ozxe rates 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 17n56nlkh go29uwnql is connected to a 24-V power supply. The operating current is 1.0 A. What is the starnlo6g 7nh2uw9 5lqn1kt-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 connexi -s9gy u.uzh-ic2:ycted to a 24-V power supply. The operating current is 1.0 A at full speed. Wh9gh2iy xcuzsu.y i--: at 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 resistances b,dsgea lb.31gy6* r 6.0 W is connected to a 24-V power supply. The operas.gse 6gr lab13bd *y,ting 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 voltp(o5cl5rn+fd ti 7yw,age of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 1n4s7 wp)2p0s atv*o p ;-a(f+gtvm ybu4 A to flow in the secondatm0wfp v-p+y)ap(aos;7tv 24 sbg un*ry. How 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 are necessary in c: rdw91z5aax-d 3 gqha 110-V primary if the 24-V secondary has 100 tu1crh- adz9 g:a35qdxwrns?

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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 primart8gck)8n)6*quw un fry coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in then8r86 qc gu*nfkw )ut) 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. Assuming 100% .*l ufip ouy-m:ua4qxb.uk7 6efficiency, hoi umobu -lp uk76*:u4yfaqx..w many amps 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 ,ko aij0rtb z;5*x/ 75iejiwka neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the e j5/ rzk,wobii;0xk57j ita*primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sewvv/u pm n0so;:fd4 l5condary coil. If 120 V at 2.0 A is applied to the primary, what voltage is preu 0fvwlm5od/: v4n; spsent 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 coil4m2angs7 awi2;1nm xdm sd* y/ and 300 turns on its secondary coil. d 4dg2 s2/im7*nyma; aw1xnms If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns app ; v )z83am0fpo+tbivo(yxsnsx* 6+nd its secondary has 200 turns. If the input cusp+bs8ivzo *px 3f0x(t +ov nm6 y;)parrent at 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 10lx/8-b1mwpv,mn5dk g 0 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can exx 8m/v1g p, nl5bk-wmdpect 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 transformer has 100 turns and its secondary has 200 t7v5t2w shlmwf 366 ocmurns. If 653mtfv lwhc m7sw62 othe power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagx p*q24mymrx3o 6kkv*e is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistr*4mk y6x2kvm p xo3q*ance 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 1:koigg,o(n 0l20 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. Finl(: ,gknooig 0d 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 usually s9e5l bpb;x-hlks3 p y3tepped up to 4500 V by aply lkx-bp;sh539 3be 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 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 to8wz7 * j7-angzo; de(f0bpeyn jp,*rrtal resistance of 0.60 W. A generato*pjf(og7wjr0-n e * 8y nz7bzd;a,pe rr 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 leluk*rb2 65rj )pe3 rkine 50 km long 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 100:1. What percentage of the original energy is lost when the transfoek62jl*rp b)k rr 53uermer 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. Howxdm66vn, y w/n much less power would be lost if the power were transmitted at 3000 V instead of6xndyv w,6 /mn 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 generat klxm* mfd74h7or is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original powed7m *l 74xhmkfr?

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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.p omg6 bb e3c9/j a.pfov4+rfq:t;pb7 0 A. How much energy is stored in the coil's rpt pf6fmej7 +o:p. gv;4c9 3/obqba bmagnetic 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-Wp-f-rl q81 lfbbo)2q :f 9jlwb(w tbe+ resistor and an 18-H inductor. What is this circuiq loqf w1(f9bjblf-8rbel2pt b) -:+ wt's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the ru jvosky56 ;,ems 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. What is the peao 0f /*uo.-d .g8upv y:osmhjek 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 A, c3fairl0;f eC outlet. What is the resistance of the lamp?le3ci0,r;a ff

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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 is the peak curre89zrgk6mel.puk5 /zw nt through the resist8zlg6/ek 5 puwm.k 9rzor?

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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 izk *jvge9.yofk87 80p foe1zto a 120-V ac power supply. What is the power dissipated in the refpoi*k89eg.vj zez 078 fy1kosistor?

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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 l0s gp3jmy/kz s9i13c$I = 0.80 \sin (240 t)$. 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 repaygkd5v hnh2w2,n0 .sistor 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 resistor isrgifcv2ofx(r0 ( ;n;c+ 3 mgut $I = 0.80 \sin (240 t)$. 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 1.0kl84wh,y8ry +q -)r:mrzgq lk-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 reactanc ur7 --rt,mpza3 p( 8dchi/fare of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have f4w )dcg0y; ui14.0 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 indu h ;g.rtc;:aszctive 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 tc;oao*z2fw,nia*h; 2w ho5kat a frequency of 20 kHz is a2kn **oziota,wh;2a co5h f w;pplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, t43qct4fsozn g 5s:0w60.0 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 re (gipg+b4:nb 9k oblz1actance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacit+:wt/: 3a7mub ilpqghpb fg5-ive 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 capa entiuk-:n ,ytgz 7x0-citor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacita*wqqzbe9od5xr 4j 4fb 0x0)for be 100 W?zqw)e o0bfab qr 4 x0*594dxjf

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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 dc6;2iex) ,z8c exlut c/ic8pcapacitor 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 an ac series circuit with 12.0kut63dh (wrg. 6r/;gsr qrh+k W resistance, 15.0 W inductir( qr3 gkkh+rw. s ;/6gh6tdurve reactance, 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 100-W - ico pqd*c9(farlu9r7 d,d;lknj(y 4resistor, 20-mH coil, and 1.0-mF capacitor are connected icn9i 7ply(*u-9d fdrk4;ca r,(qj oldn 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 +: w+sm+crf xo0 qx2fjHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sewx0f2x++c qs f+r mj:ories?

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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 induc.dsqj3 u,q tz:erb 5e6vu-qp j+t83, nwj em.utor, what is the impedance at 1000 Hz?v:, . e+-,b53uwje. tut8djq 6jzeursp q3n qm

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wh(ru(6c n+:j/gef*biws wqu7zat is the phase angle at / jws(7(f6b iunz* rqg eu:c+w1000 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 ccggf,ku --hfr1b6 , w qs+or4bapacitor for a total impedance of 10kgb6 fr+ob1s hg4wu c,-fr, -q0 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 1 8 kyh eoy*z2k-g3;ol5 e/0nm,aolyua00-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 H5 yyaa-o3 hulm8,z y gokoee/; 20lk*nz?

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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 acjgjdiiv) vpzj r b.zo)62 5k h 0oiw4s/1(wc7 450-mH inductor at 5000 Hz for a toojhij 7d)6 jrics. zi/ )0wvk4w1(25 bzcogp vtal impedance 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 putv k;b nf/xtdglu5m. 81o,3vxhsu p6si1 ,ob2f in series with a 100-kW resistor at 1.0-MHz for a total impedancx1d; 2mv6tvsofhu u, 1ngbi bx5/.8s3f kl ,ope 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 c h3fiok z*f tnub qen q1rl*402y((+jponnected in series with a 20-mF capacitor. What is the impedance1rlu2nhz+q( o(y q p*itj4bf0n 3k*fe at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neede ;l(/yh:bx etcd in series with a 10-mF capacitor at 1.0 kHz for a total impeda/lyhce(x:;t bnce 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 pjs6b4e bs85ed+aedtvo up1p 6 ((nf5 qhase angled4b pf vees1audsp5qn 8( (j+5eb 6ot6 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 nr,j/2xm 6z dsyeeded in series with a 30-W resistor at 1.0 kHz for a total impedance o z6xr/j2,ysdm f 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 series4 71.vpqgvtmkzq4 z2c with a 100-mF capacitor at 120 Hz. What is the phase ang v4cqzgv1mk7 t2p4z. qle?

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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 r1z-4o g)iwyh 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF oghz1- riw 4)ycapacitor 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, eciji* ) zb0lhxy +ak;q4 ;,fr7eam(k 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 the rms current q7hrc, zxl(mbjfk04*;eya) kea ;i i+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 nn t9/g+ 9sti (b681ls whj2ua phcf2kcapacitive 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 thisai+8g 2fsj9ch 9 t2b nlw(61n u/tkhps 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 q7l: zxl.vo6 9fa0 uhzcircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w9ohl zfqu.az :7vx0l 6hen 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 z+.ioo8t5 n36aonnwo o62xco-W resistor for a phase angle of 6wo3 o2o +6xntac8oo n.5i ozn$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequenc4t j p)kepol-*2d17tza5a eg+ vt- rely should the circuit be driven in order to have maximum power transferred from the driving*-4j7+td vl a eprk2pa e l)o5etg1-zt 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, 15.0b4xiuj2 ) /z y0msbhtr,p;(dv W inductive reactance, and 10.0 W capacitive reactance, when the circuit i/mrby(4t) 2uxzdv ib; 0h ,jsps connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is c(gyin o0kic);l 6x- e$63^{\circ}$. 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 602 mtn8cw.onsq*:t z zl1pxii 0s 5m)b9 W and a resistance of 30 W. What is thxnlmzit. m1obt5ssqz9p 2 * c:08 n)wie 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 series RLC circuit containinp1m9h 82 b+;h kbhdfxng a 50-W resistor, a 10-mF capacitor, and akndm2 ph+bx;h8 b9h1f 0.45-H inductor, 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 gs4a1enxizsx . .(h 2s1.0-mF capacitor and a 15-mH coil in series?g4n( seh.s xi2as.z1x

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neededq s3(0naihs6hq+-:n nrkee k* in series with a 4.7-mF capacitor for a resonant frequency oki*he 6sshr3q+ e:-n n0ak(nqf 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 seri* 9zh1 x*nlp;hrt0(qdchyz,uk )l :wujo9a8ces with a 3.7-mH inductor for a resonant frequency of 1000 Hzuyc p9lh1q orw80c: ahl*9zdhzk*; ( )t,n jxu?

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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 iv+dvk8j:pec2x6s n - mn series with a 30-W resistor and a 40-mH coil if the resonant freq vp c:ej6v8kd mx2+-snuency of the circuit is to be 1000 Hz?

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