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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 unit j*+ ud 4vkld0obztl5(s 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 inductj 6axvlg*gob6 4r 2ypcj va8+-ion states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces; byb3h6;w ue(kkxg x6 what kind of change on the indkw e;6(bx6 x yk3;gbhuuced $emf$, 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 magnc dgobu -meo 9k:j 7/..47y(zpyr aehnetic field through a loop of wire produces what kind of change o( 4jubd7hcry7-k.o/9pa yngez o: .em n 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 r0 ,e8 lube7uv2dos c(a loop of wire produces what kind of change on the indu0s r2db 8ulo eev(u7c,ced $emf$, 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 6mf5j,o-rd yymxk frb 3rh:ti7q v;0 .a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an la rfjie)8r;go 6r 49zinduced current in a conductor will be that which tends to produce which of the followire9jz64;rl)a or 8igfng 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 hoiwt)-qa3 v-z inhu8;d5hnnk,rizontal table. A bar magnet is held above its center with its north pole pointing down. The stat8 i ut ,v-h;nq)wd anz3n5h-ikionary 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. Ae qa0iy4zs9s 8 bar magnet is held above its center with its north pole pointing down, and released. As it approachz9s4easyi8 0 qes 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 top in a region where the magnetic field ve-ubx 3zhjw/jw/uj rm mr ::z--ctor poinw /mz- jm-xw- 3ujr/ z:hrbj:uts 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 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 xz8icm zg4 r(f/sj)y:a level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger:f4 iczr8 gz x(mjsy/). 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 tov6dw9kso 18a cbwey q7ut6.9 ap in a region where the magnetic field points straight down. The ts bak6u 8dovw. q9ey7c6wa91magnetic field disappears suddenly. When viewed 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 wire lies on a horizontal t9*zn/qfe d as0.l9tz wns+2 ngpup.1ttf .z8jable and carries an ever-increasing current northward. Two coils /81 et z+jptz9f.pf. wz9autnl*.q2n ns0s d gof 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 loop of wire wt;bph947 hfum3o nwz(ith the north pole entering first. As the north pole enters the wire, the inhmuw t ( honbzp4f379;duced 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 rotated at constng.j 0og3 p7-zrh, uehant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced goeh,. pug7rj 0z3- hn$emf$ 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 rota, 9+9gmx* tjn pebinymbo;93 oted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mube p gbtmxnjn9,o 9;*iy9om3+st 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.,vb zel nmt rzm)m)3/-
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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 thaay4kr4njur7.7gqs 3 gt 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 av hcgsg3;/qi . magnetic 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-west direction) is moved5. p w wt ndsmc+p(6z ;lx9jqq1eu-k*q northward at constant velocity through a magneticql* p(k;md+w9qxn.q6 -u1twcjs pe5z field that points straight 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 ;lxyul))xjk j/9 e( aurotates 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 tranqkch24n ,*h lkdg d5g,sforms

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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 sqzgvt;+ p2-nf6wd/oiecond. The frequency of t;pfw t+2dvo gqz 6-n/ihe $emf$ 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 u5mmitccbntn1 l 1 30m+sed 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 devjc72qpq e8lx 4ice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary2 2q;l350iyk g1q rqurtof a4o coil then it t0u2yli5qkor41qa r q;g2 f3 ois 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 secondara3xtd d 8sg2c;y coil then it dxa;3d tcgs28 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 inputz +a nq+9j-kcu

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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 resonan ,4d (gtwemljx1 wbucp4 qw w1fi*a)6ybo49i,t circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are co mv 5ifb u l6pw+6eu: wczhf:0n3w8p(fnnected in series to an ideal battery of consta 8 m bzw6+pcuul:3 6 ifw05w:fhpf(nvent terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of constaws (-ijxqif s0(gf:7 j6h6rlant terminal voltage. At the moment contaci 7jq f0i6 (jls(fa :rw-x6shgt is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and rerv0jpx0 abie85 izp4 :sistance 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 resista2l ;: rdplwas3nce 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 indum b38c qn;3zructor are connected in series to a battery. The time constant for the circuit n 8uqz;rm3cb3represents 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 conb5x kkgwz2u:.f l1n 7qnected in series to a battery. The battery is suddenly removed :fx2ul 75 .qbk 1gznkwfrom 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 have the same units xp okfg*z//3 :m 3fvhgexcept:

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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 powerx*hlwcpx;u:hpui5f5qh9 4i5g6h y;h 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;:/.t paau(vgl*/bxfki8t yyvz + nw* an AC power supply. In this circuit, the current aufgi/ :v*(klv;yp*.x ybtzw +8n/at

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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 4 /jrhj3l:n hoac circuit changes by what factor when the frequench/nj l3r4hj o:y is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the f yzog :4, vx)ugl66mz-jpuq. inductive :goz qp4l6u vjx , f-6.uyzmg)reactance 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 ind-+h3ns) 5 qwusrj ln7wuctive reactancn u-qw3r)7 wn+sj5 slhe of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cebn yh0 ttq 67ql(g1.rw(wcfg1 (9nyu ircuit, the currentl(qwg1(. h7yte tyu(fcn96 1bgrn0wq

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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 mb1x46db ,f0z4,g/riyw kdqe factor when the frequency is tr y4m0zbg r4xq6e,b wd,k/f1idipled?

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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 ca oertrc 2u,i 7.7ocs umoh*x*7pacitor approaches zero, the capacitive reactance of mo 7ui,7*7ctu2 e hs*c xoor.rthat 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 be8kjpecdvu 6ri6u)v -)a 97o dttween the voltages of the inductor and capacitor in a RLC a-k9dvuiruov)t pc8)6e j67d series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an R - e-kb7blmcs.LC circuit 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 impedance/mca*l vkjdi9hx (+ a0 of the circuit increases if R increases.xm9 aikaj+lhc*0/v(d When is this 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 impedsk yy 47 sht6+)lp e+ugl.c8lcmgr y5;ance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circu e2vzq8o:n: p cjy6zdb p/rh0a y8s:wz0ya.)l it 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 circuit 3jwks jj3(hwpx qfkeu/x. kwr.1u*8( , the resonant frequenk qu/j pje.frx313.kk( xww u8wj(*hs cy 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 voltage. a zbds,t (jsv3n))(vw 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 occ)x1r lvtfevy5),5sx q urs 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 jdgabq* w54)g m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux)qab*wg5j dg4 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 /af1r aook9f0.10 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 the0roko9a 1a /ff magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.gb xd8/ 8pp1f4gq qu9t20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie p1u 8ptgxdq9f g48bq/ld 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 adjustable single loopgpw4srn).q9ul5 xn *b 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 coili;c:o , kudex j.we73r changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square ff 7 iw3s(-o2(j,,bw kpehitglrame with sides 18 cm. A uniform magnetic fiel 2b3(ki-hl ipf,j seg(owwt,7d 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 induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 cac:y*- qus 9smfmb ,(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 ai,q4q i +vv7h-yyj7n.pia(e znd 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 flies horizontally at a loc hlaw*;:ta2njation where the downward component of the Earth's magnetinaw jl :t*ah2;c 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:; zpppq.r7 vh a constant angular velocity of 2.0 rad/s about a vertical axis through onezqppr ;v7:p.h 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 50 loops and a cross-sectional6f imce,piga (7j;: oz 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 o2tho: 64ki 0xoh;jz jxf 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 lo 9 7jni ;;kk.rrigcn6vops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to th. krnn;7jic;gvr96ik e 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 pa(9s w 3xvg9u2 s6ulobk,xseop 7d31wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generat9ewp3ioy2px+- f+ aeqor with an output of 12 V maximum when rotated ai+waefqpp2oy +-9 ex3t 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 mapx9 2rdfo*5d afn6w l,ximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resiswo:/yeh6+x /wkt 6hi 2jr7qmdhy6c* g tance 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 motor operates on 1g b:7;i*gb divla8rh .20 V AC, and when running at full speed it generg l:ia8 .*dbvbh;r7 igates 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 sz 8s;i4gdh u 9 w l;daop19a86cjzfgn;upply. The operating current is 1.0 A. What is the start-up cur6n1hugaig9dzs4 ;pzj fl 89d;cwa 8;orent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V poud-g h e.fv*8iwer supply. The operatin.efdhguv* i 8-g current 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 connectedgu,bo*d 24-tt9wo hvjlve: 0h to a 24-V power supply. The operating current is 1.0 Auob:j9gth,e vhot4 vl w *0-d2 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 reducp7-v8bi)muj k*ncaj:6w j z b+e 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 primary of a transformer causes 14 x a95hnmc aup8gcxn)i r(2,; qA to flow in the secondary. How many turns are in thex,mu2an( ha 8r9 i5qncpc;)gx 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 a 110-1i c+gj t) orig.s1atr:-.fy rV primary if the 24-V secondarygor:.jg) ti1-yac t+rs.f1 i r 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 .f5ecky svh/0cr f2x (500-turn primary coil and a 2000-turn secondary coil. If thc5e0/yh2f rfkc(vx .se current in the secondary 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 transformer. d7 +j+nkoni , fo7(iwcAssuming 100% efficiency, how oik++ijndo (fn7, 7cwmany 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 a neon sign transformer provides 7500 V at 10s(9j8tplpwnd*w 13uehh08ok.0 mA. The primary coil operates on 120 V. What does the primary d1d*t h l w0jh( 9n8kwpoe8p3usraw?

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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 prima n-k8k tfkdrh3e 5s26, 4gdblary coil and 300 turns on its secondary coil. If khdrsbkd kf6,3 5nea-84 tg2l 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seco1rfcqn7f-/55 v ybwd lndary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the f5nc5/ bwvlqr1y-7 fd 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 6tw7t9kn1*ektl1bbd turns and its secondary has 200 turns. If the input current at the primary is 100 A,nbtk6 71l9e*1ttw dk b we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and iky i,-h *0 vmz4x.bnmbw+a q8ats secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to hvqb* 8ya+b-.w 0,mm4znk xia 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 an7hx 3p iwa,6n5 m)gu+rbqphn /d 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 bap mnq6nhbru)w 7 ,+3 i/p5gxhe (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 voltage is usually e1ye 1m60jb3v sbzxb f :25dkbstepped up to 4500 V by a transformer and transmitted 2 kje5fvd:3bybbs0 mz exb116 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 v*.xby ekg: /r*o/ywiem(3yb4db 5hg 5k,yeacurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line:r yge kyw35,*ba mvxeoyyie.d*4b5hg/k/(b of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u(t+kxr2p fb 1e- dzh3pgv6 cy-p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost invtfgrc1z(hp-+y3p2xd b -6ek 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 ( v;b s26alj47hamnmnkm 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 wo4 ma;an26(j7ms v bhlnuld 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 hasiefy4p(8mmn+b: q l l-b(:yp b a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order t(lbb-p4 y+ep 8fmlmi(yq: :nbo 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 dow9 lxr vdv*o1z/n a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of a/ * rlvd9x1vozt 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 ajrwhh s1b66i 1bxlq9( t 20 A. It is to be transmitted on a line witlb196i bx6jh(h qw1rs h 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 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. i6qc pf vnm+uuzo 10u03(q; hxHow much energy is stored in the coilqu+o m(hv1x ; 0puifzc0n63u q'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 contains a 6.0-W resistor and an 18-H inductor. Wha 6z lj.ragt zi x0+gva2wd0wh,)s*8 fzt is this circ+r waf 0ztg)2jd .hg6xz a,0il8szwv*uit'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 rms voltage is 1u8rha e k:xz7d0)vmh 7zmu *a,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 the peak cuc 7 8j+.6nbr ghqw7u*jsz3uxirrent?

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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 outletn8cul8b .2dz9h xdwy2 e6le2 qmpd64a . What is the resistance of the lameu b92648nd6 2dd yqm .czhl2pwx e8lap?

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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 is6 2*ivx3lq uii-es.;gr,m ioe the peak current -uglx .roi3,m qiie 6esv i2*;through the 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 bw z29a p,y4vs 1+z. a+quujavsupply. What is the power dissipated in the resz y 9au.2zspwa1vb+4+q a,vju istor?

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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 resis4a12 (q1mwqr y soujhk) y(i-stor 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 resiu9d/r6 mp;.wuj1hxp ostor 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 resistnwvo- 7c /vp3-lnalyoke 9 uc,/*drh: or 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-mgk l+o p+ v0tpa;.3gqb3 qob:0lzbyn9H 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 m5k3 lnr*o7hy.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanceo 8dz+8ghwl,0frcme( g.j8cw ?

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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 reactance at 1000 Hz?wdoc;+rru l ;: uqn,b8

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a k 38hml, lhvi.frequency of 20 kHz is 3k8lhhi ,v m.lapplied 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 ly6uf/zc3be 3 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor abzo.q+fdmxu n8tv8 bp(,*i num vn 0q,w.8o4gt 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 yku axnu 6-jr4n.wi 07of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency do kfg4lx0ltcdd., )1zx es a 10-mF capacitor 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 capacit + 8fweqps *eqt:9mg8zor be 100 W8fw:se*t qz8 p9q gme+?

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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 b etssdjz,9ki)-o,u( r tz) 7qHz 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 ofs( u fst906uu+k. 3 sutgbo8uv an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cap 3t8.uu9vf oss6(u0gbs +uktuacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0 s 9df-xm1v8tn-mF capacvf9x1dn 8m s-titor are connected 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 coisj.0/ymrw+/n o) o24+vewx u7fq rmg el, and 1.0-mF capacitor are conne +7v2sweyu o/e of0g.jmr+q nwm r)x/4cted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whatsybu f9fx2+3m,d+ 8dku sp+t d is the impedance at 1 ub89xpm f +d s2ts+d,fdu3+yk000 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 i ,l(7 lfykmdz4n series with a 20-mH inductor, what is the phase an4k 7 ymdzl(l,fgle 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 capfq7-ze c6xi 9racitor for a total impedance of 1qiz 9ecr-x76f 00 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 ser ;u7n8zccx.n3 ohp z5)st8xhc ies with a 100-W resistor and 15-mH coil to get a total impedance of 11ocup xc7nhs x zz.8tn 5c;3)8h0 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 lq/1 sq8fxo5h inductor at 5000 Hz for a tot 51hf8q/sxlqo al 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 put in series with a 100-kW resistor . sjy. wym34mcat 1.0-MHz for a total impedancemymcw. 4 3yj.s 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 capacito rj+4p1h 9zbtc6o0baor. What is the impedance at 11jpa0o4bb+6o r9tch z000 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 seriee:8 yrop l90m:d*/wx(zfb;dkpwx :rvs with a 10-mF capacitor at 1.0 kHz for a total impedanwy b8 e :dlrm:op;xf(d0kr/xpwv9*:zce 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 phzh 9; *)bvc ik4l8tfcnase anlbct 4)vkhzni *9c;f8 gle 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 resistor at 1.0 kHz for a tot)m 4n;6jq6rfw fba2 xdal impedance of 46bf4 6q;xnmrajw)d2 f 5 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series wi*ueo2 r6. uz5clmgtw tf.hv+) y0 j3 0)nstgtpth a 100-mF capacitor at 120 Hz. What is the phase angle6. )p0ecfh)n *u 2 yvj+m3 utg0 wltgs5o.ztrt?

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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 Htsyke*sh*ozr k*m);x0u1xi c (p a 7/xz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor hak;rok1*t* u*)(y/ ez pi cs xx7x0smare 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 104 gbfo-4 oaw5x1yna7k .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 in thegy5oaobaf 4k174 n w-x 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 capaci;dp:s rkkww*vl 5er2( tor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to rl:( *eprvk5s dw;kw2a 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 circuit containing a jafgwg /0qzzbn7lcu;5,1,hg 50-W resistor, a 10-mF capacitor, and a 0.45-H inductgaz0l 7czqbj g;/fwg,u hn5,1 or, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor fo kgdpvz-26vv; g6:lg ir a phase angle o6g;g -d vvl2vki6zgp :f $40^{\circ}$ 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 bmcs.4xr,l 8s has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency shor,s bs. mcl84xuld 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 circuit with 12.0 W rexo i2.zh/a*d fsistance, 15.0 W inductive reactance, and 10.0 W capacitive reacoh/*di 2xf za.tance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circubp fqot5i6oj2, luavy. ay0c8;cg5 v+it 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 circuitcis,k8 d0s fd5 has an impedance of 60 W and a resistance of 30 W. What is the power factorfis58ks0c,d d ?

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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 containing a 50- emq-3 :9mefinW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sumfie9q3e-m: n pply?

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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 frequen 18vd q8e cpf/9xucl0mcy of a 1.0-mF capacitor and a 15-mH coil in series?8e1/mfupdlv 9 0c8xc q

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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 dow) ;g92koqps ,jry- 4.7-mF capacitor for a resonant frequy-wo)9g2 k ;j,prdqs oency of 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 inductor for a resonanp+ )okvct; tq b1;hwo9t frequc9p;vwot) tq b1o;+khency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a3(0hvds3rf i b 30-W resistor and a 40-mH coil ifv hb30ds(ifr3 the resonant frequency of the circuit is to be 1000 Hz?

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