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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic f1q/qgs e ./vellux 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 1eb98/)iedjmq px5/ u 6kgp- p is)wvmstates 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 loo7vp5- y8mz gg/5ptcj a))dsujps of wire in a coil produces what kind of change on tszja)8m g7pj55-tyuc)/ pv dghe induced $emf$, 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 o8iygpbz w/r5)f the magnetic field through a loop of wire produces what kind of change on the inducedrib)8ywzg p/ 5 $emf$, 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 noo+n xovv o,d4 0/jf(glfk.8 produces what kind of change on the inducedf4 o . xvl8k,j+ doofn0vg(no/ $emf$, 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 magn9 woje*30scou+ 9f tqvetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductltum 1 t7*osm4 ny;dkg 3yd,;bor will be that o s; ybuk7 4td;3mg,n1ydtl*m 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 ba9h;m 29slvgffr magnet is held above its center with its north pole pointing dgvsm 9hf fl9;2own. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is heldxy p;8j:g3de r above its center with its north pole pointing down, and released. As it approaches the coil, the fallingy; prd3:8xg ej 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 thb 5ud ua)epkv.9:9g7 dox ekg2e magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense od9u pgeke9o7agx52vubd.) k: f the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vecf(h+y jr;yp,55khp kvhy5tw2tor points straigh5(ht52 fwykvyr; + hkpj,py5ht up. The magnetic field suddenly grows stronger. 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 a region where f e/53dmtbg0mcvfx (n52;f cwthe magnetic field points strac c2/f5t0e( mgdf fbn5 wx3;mvight down. The magnetic 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 g, i.5er1frg5 a7 hyknon a horizontal table and carries an ever-increasing current northward. Two coils of w,y 7 ra1f rih5kggn.5eire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north psa*b8qsmdtmh5 y z31h *l 7sq.,zzk 7yole entering first. As the north pole enters the wire, the induced current willy. b3 z7*lmmqhht*7 8z5s1z,q adykss 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 wilc7mm s8l(m; wre is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the (clmwlms87m; 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 7 3)c (ru-ju:umf/l dmk4brm phr4se+at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points stra h7+esfumup /ur l:cdmrj 34k -)4mbr(ight 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.1l pzuzfk k6-i+(o*qv
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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 (z9o kfa; i6rrthat 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 +jbc/ l*bh6uk myiq50 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 67q;bs2jjhso 06ycf tdirection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acroso6sq j6j0ybf;c2s7hts 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 rotvz6o6eo12 yiy ates 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 transform5 )z1ise-y ibms

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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. Tr.u(:sop xz)llrk6a ) he frequency of the.alpr6rsx:l) (kouz ) $emf$ 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 dfr sk- yt.,. 1jdezg2mevice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devi(vw2 xmde1: rnce 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 p0-nj+ bqnl yo)p/g2i pmzw9o6 t w1:jcrimary coil+joj60-m)/ 9bi py1zqw l:tncw2gn p o then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil g4zzlgl96sro9pe,/a - frt u/contains more loops than the secondary coil then it i rl69ep9rf /u4/ -slgzto g,azs 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 iw v:ag fw346luy cf*nun 5h(4input

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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 ci x wcz/ tcxyjsrkq) k+(,ldbr bn;8/96rcuit,

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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 se4m2y(a x6gxv-, dg10 glp wcfiries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag12xa -fgl w p0(mcdgg ixy,46ve 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 onyzy /,jr .a3:q)a5 f(szfobideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thenj/ f szy.fo(qr,yba3)5ao z : inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectv-5w sw jzfm s,.o1cx;ed 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 cowguue*3cvj) x506y btu6sdh(gz3d+xp(s9 trnnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connect,g9 p a5p/zjj85jd q kfcgz,h,ed in series to a battery. The time constant for the circuit represents the time r j5a g5jf,pq8kgh9p,z /j z,dcequired 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 batter/wcgn;wa15: sn9u5kfhmhj v 7y. The battery is suddenly removed from the circuit. The timu;s19jvnf5ch:k/gw an mh7w 5e 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 exco)dk9y/t 6 y,.x ctsbkept:

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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. 0w u ejq/r;9niqq7 qz( On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In tnvkqcji*6e bf gk *i:2:4o0qchis circuit, the curreng6*civk4q* 2n kqb0ojf::cie t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what fa)rvjsx fp ,dg 9xwkx b/)+-r/wctor when the frequency is 9xfsd/vxk,w /p)b+)grwr - jxtripled?

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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 inductive ly ry. ca4ej:)(dwz:dil :hk:: hl.iwa )r(yz dy:ej4dk ::clreactance 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 approachesx3ygz; 41razh zero, the inductive reac1y 3grhzz;4 xatance 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 circuit, the cuxm f6fbw-0q4xrrex6- fmwb0f q4xnt

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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 whaa6o 6jtdbgti:hg/*39of)xjb tzox 37 t factor when the frequency is triploa3gzto 6j/ 7x d)6io:tgb* j btxh39fed?

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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 ac3smmqt go()7yroh0*3xe c.skross a capacitor approaches zero, the capacitive reactance oo0s3.em (*h)m3cstxr7og k y qf 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 3h wx+zo,wtu 8the voltages of the inductor and capacitor in a RLC serieszu8,t+ oh xw3w 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 RLC circuit is defined)a)q/pk3 csaz 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. 4uhs9 pf.ax-f The impedance of the circuit increases if R increases. When is this stat-9ah4x . pffusement 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 imphpvgxxof1 zycr4 abp- 1(o0w98 g+il.edance 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 circuit incocf8a m /o,68q qmkzv)reases 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 capal4q1r3vo tqrup4ec 5n/ sm9v2 citance both double in an LRC series circuit, the resonant frequency of that cimelo49q/tvpq 1 43r2usc5nv rrcuit 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 b*59fcw t)nw f qe*wi4ky an 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 circu;kq+. 7gcq3 nvw 5e7q0o dvjeg8akmu: it occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m irg0m4kbs zg);wjbg q *21ox d*s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through tho;*s1kgqb gb*mwzdrj4 ) 2g0xe 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 0.14r q/,igen6mj0 m is rotating in a uniform magnetic field of 0.20 T. Find t,/eqirgj6n m4he magnetic flux through the loop when the plane of the loop and the 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 fg r:/qsjy 6ypybu . -ba9rq:;a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lofsr-gpa: :6bru/jy.q 9 b;q yyop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable sinl/ ld* d6gp7 *6sc)ij )pexjingle 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 fromth0+ccbauv; zc fpg)/nk 5((z7yzh / xkghz84 $4.0 \times 10^{-5} \; Wb$ 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 turnsboypfc;l gpn u0;0v2rtz;)c* of wire on a square frame with sides 18 cm. A uniform magnetic field is ap ;)cupf gnv0r 0yzo;cp;b*2t lplied 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 wirz sqcyb- 2/zi3szj4o/7 bw0y qe 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 8kfl ,p0sd b58,dtmzland 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 win6pfyar)kde 0b9f2a c/ g span of 60 m flies horizontally at a location where the downward component of the Earth's magneti/9br)af0d62ypcf ke ac 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 constant angukfl:vcn x ):1ilar velocity of 2.0 rad/s about a vi:x)n:kfl1c 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 generator has 50 loops and a cross-sectio;iot. x yal8kt(agek v6u* r-9nal area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are r w5),ijf xs;rle;r,va $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. , 0dzgu:*8j swgf)b yv 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 i g*yg)u:80wbv,d jszfs 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 l w:kt0wz/pn :100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC ge9+gk1 ai1o5 k g+ulvtpnerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the ro+ 1kuigg oal9p 1ktv+5tating 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 gene1eup;iam 03o: 3ff.gh ckzw8arator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. o7cik47e hhvi*i b,t/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 havsb 31 p/lc nsw;m*9cfhr alc09e a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bac9 pclc3msn*/ 09fhs;rba1clw k $emf$ 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 pqy2 ym7n +/blz)q lr4lower supply. The operating current is 1.0 A. What is the start-up/ q2lby r7)+m4 zlnlyq 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 3*z a73hhtktj1up7xy z.m8kv is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wha3z tk*7hkapmvh. 8zu13 7xjtyt 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 24ak8 gn x mf*uqg,t2:i1-V power supply. The operating current is 1.0 A at full speed. Wg q *u if:2,xmkntga81hat 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 needed3wtlr 48kfjs6,6j gfa to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 1 0wc rzu a-w p5*ofmd)a+n)b7 2kwi+by4 A to flow in the secondary. wyrz)c+m)kbn*iww 0 b7-pa2 +d5 ou afHow 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 a 110 5tr y/2hfk,ah-V primary if the 24-V seconf h2/y 5t,rhkadary 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 consis 6w:r oolc2f1/2v u,+tbih rell)vu,fts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secoev,oo6v) tu + lfru cbil/h122:l f,rwndary 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 transform0+5 yoobg:q)ojzcn rs7;tfw: er. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?gj0)rq+ cz tw o: o:nyf5bs;o7

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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 z5 1 jg.5sb tba041l,fpze;a vkfq1q sa neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pe5 t.b1 ,afzq5; sa0j4qvlbfsz g1 1kprimary 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 onr/a jip6ebkpo) )ar y8 -w03indien 71 its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is app-ie6ja /83oy nrnkw pd)br) a1ipi0e 7lied 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 ct/:ieq(agwxb 4)- ng foil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secoxwfgg ) /( a-te:4ibnqndary?

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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 ando7e6/ no)w 7wi ccmz(l its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currenwoen z w(co7lci) 67/mt 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 transformelij ut:csk: 4-o0cek /r has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the ouj:0u:el is/ct-ock k4tput 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 10; 1jkc vz m;i0w3u,uwc0 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 secondarm, u;3czc1ikjvu w; w0y 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 voltage is usually steppnjpbm; h(3cg nw*55pmed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the prb 553*whpjgp;( nmn cmimary 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 6mu d j56;rai;s8vpv.z 0 A of current at 120 V. The voltage is usually stepped up to 4500 V by amvj5 6ai pdz ru.;8vs; transformer and transmitted through a power line 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 usuiyv/./*ctuiur1(-zhk) x g m bally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissio/ c xubk.gym)r(th-i *zvu/1in 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 totezyejr7dcr 7(* cx15lnb)+ v jal 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 10dev*n r7r(yecj 7b)zj c +1xl50:1. 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 of 0.60 W. A o :wbngdpkpz6- yw- d 5b0ca-7generator 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 rati5w:67a godpzy- cdwb-kp n-b 0o 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 1000 V. How much less power would be g01gv2m,fctw l 1tfg2m,cg v0wost if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be trans lyc4yj)8 d)yjmitted 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 )y lyjjy4 cd)8exceed 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 energy is stored in the c96dqte yuhc ol*eftv3r *-0 aa-yy9 i*oil's magnetic field?qi-a evuy y9*f9e 3y*adltro*6 - c0th

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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 c uo:so,1:ejq/sc1e (r-ke hainductor. What is this cirohe / q roesc-acku1:se:(j,1 cuit'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 v- kuwd)e mj kg3qx*7a(oltage 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 tfde f)b43jh4fhe peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is z39nj- g:ptqz+s pcq)the resistance of the lampjqtsq: +n-zgzp )9p 3c?

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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 120il3gq l)6qs;s7; rr7 iw4 gwsd-V ac power supply. What is the peak current through the resistl3 w77 q s)lsg;64iird;gs qwror?

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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 por hk ;)e6b x8ymp-z:d:dvx z5cwer supply. What is the power dissipated in the resistorde x:;rbp8hd6c) kzy xmz-v5:?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through f:6:3k l9ssdi 5wnmrt0 ;pbgxa 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through asarsxw.me60 9( 6np hxi4nb.w smk8d- 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 resistor3ehuq0a,kbbiaio3+w 9 7 4u rfej )rj.5.mxih 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 inducurjwviz -tx2 0+bs w4:tor 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 reactaows3mnxr965 c (g ;-lrj+gladnce 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 14.0 W of inductive reactance? b uu/z vz9(lbtc01z8i

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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 iho .ptzkrmk4p8rt-5hl 9a k78nductive 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 at8skqk t84e5)aaiz, bv a frequency of 20 kHz is appli58s4zb)q8eka avi, tk ed 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, 60.0 Hz smo3lv 69wmzf1olua 2;ource?

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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 aaz/l0 u .aqr/k 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 *le x6 j )tu b0fabsemy8/e1o0capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance o7m5wyv d;fo/:rl l4sb+)jo pyf 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 capacitor be 100 q jez h7q2d04aW?0dj qea 724qzh

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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 capx,: x) a.l5isymy+7xitg5 g s*lv5 5 zu:hmsruacitor 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 12.0 W resistanv6idjd) wo 3)zce, 15.0 W inductive reactance, and 10.0 W capacitive re6dow)i3dv) z jactance?

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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 resisow; *dp7 nz;vw xon9p3tor, 20-mH coil, and 1.0-mF capacitor are connectedzox ow*nnw39ppv 7;;d 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 1yr zd e,yorsl7sg69htu91(a5 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitora lod(s9z975 r1ru h 6syty,ge are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series -g - 5u28tz:zcaxa 1wz da3sanwith a 20-mH inductor, what is the impedancd: 1tna3gwa-5x-s8uzc z zaa2e at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what2p1iur.mt9 :k5 jpug d is the phase angle at 1000mtu du.p k1 i95jpgr:2 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 circui;sg4 zebwb 2f*w/dk nhy 3 1lm2yke+g)t with a 20-mH coil and 1.0-mF capacitorm2sfyl w4 wk+/gkenbhg*d3e)z1 y; b2 for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed x1/jo* jjg lxw99*c,) p7 f 5iayfdsvrin series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 1)*ja j 9v9 yg cf*ldjwxx7sor,f/p5i 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 inductor atpfx,6-vmf hm a*sf+1t 5000 Hz for a total impedance of 40ffsa6p,hm-x*t + 1fmv000 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 at 1)4yxna b5z9u m.0-MHz for a total impe9nx 5ybzau4)m dance 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 conne6npczt stk ,v,k+ohpi57 j;:w(nd a6acted in series with a 20-mF capacitor. What is the impedance at 1000 H(:taoh ;n,dp5 anj7kic, t +pwk6v6szz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed908fm1hpsnj t4 ci(khltm:6 k in series with a 10-mF capacitor at 1.0 kHz for a total k4sp hcl tjmf9h 0(t1i 8n:6mkimpedance 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 g9 jn3k3fa4 gt8mce f)yeq.f;a 10-mF capacitor at 1.0 kHz for a phase ana 93gng).4cye j8fte fk;fm3 qgle 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 kHzpt6q/+ bj/nuqn q ,7hw for a total impq6wnj7u+qb tp/nh /q,edance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Whatjk)f bt5d- 7p*e ju(rl: rdt 2vn;ii:d is the phase u)tdtv*-b ej(p 5r;fj:lni dk dr7:i2angle?

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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 akzjl8*h+sd w: nd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor s*+ :wkjl zdh8are 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 capacitor, and aa: -o1fi ije(s;ko)3gkkd+f m 0.350-H inductor. The circuit is connectedm fk) fi kao:kgjdi+(13 -seo; to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a wfut5:*pygqfztdxa +sa- :/-capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in ser gw +f:* qy-tux-ad :5taz/psfies to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resiorsh1; 0a f(xm jv2-wtstor, a 10-mF capacitor, and a 0.45-H if(tvm0o ;ar2w- sx1j hnductor, 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 neced f/gwt/1:n v)h)rn otssary in series with a 500-W resistor for a phase angle of /tvog/nw)tr )1 hf:nd$40^{\circ}$ 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-mHs 0 yhvwh:q.6q, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transfe hqs:y.6 hv0wqrred 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, 1frt.(2cn vzf7z6 uz4h 5.0 W inductive reactance, and 10.0 W capacitive reactance, when the cir f 7(fz4znur .zthv2c6cuit 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 cot 1r/lrbumvr+twp/ ; q7h;l(ircuit 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 impedanc jg jrx6nf f;wj, jl5xd/)2fi1zs0a2 be of 60 W and a resistance of 30 W. What is thnd lgjx2xf 152 j b irfjwj6zafs0;,/)e 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 fhh5m4uiwt zfny u81 b61uua10or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H im a0wzinb11hfut85 4y 1hu6u unductor, 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 frequ0 zy) yk,rrz-lency of a 1.0-mF capacitor and a 15-mH coil in series?y-lr0yrzk ) ,z

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neededghz u(,;bu/c2bjr nn5 in series with a 4.7-mF capacitor for a resonant frequency of 10 kHzbn j2bn;gu5z(ru,hc /?

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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 forl1 :k 094;t(t syp+3t7 clvjizychtaa a resonant frequency of 1lj c9+4z ah:tt spiv; 0 y7tcalt3k1(y000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 402 w,pr*dus )k6xnvs2e iv gfuq3hp 0;,-mH coil if the resonant fre qs2 us3)gkr en,;2vvwiphup60xf*,d quency of the circuit is to be 1000 Hz?

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