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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 followingf,6)svtkv.7 x j7ga vl are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thatmf6+7b;fpai 7oyts2l vk bo5( the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kinda.46a:b .ahqkok luq2 of change on the indua.6k 2qu4oakh:bl. aqced $emf$, 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 loop of wire prod cm1 iu6v/kr2huces what kind of change ourc/mvkih126 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 ofi gl4w :km0c*k a loop of wire produces what kind of change on the indukikgl :4cm*0 wced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fie c )aivbpdnn2 z0;a0ri8aqd- 5ld 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 x v; yozog39+04ld5ma aez,c pconductor will be that which tends to proa 0vmpla ody4 3c+xz5,9;egz oduce 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 h p/ 75kq+ye g(bivcd qo1f-)bqorizontal table. A bar magnet is held above its center with its north pole pointing down. Tfi-gq+5q )vpbk d oy( ec/1bq7he 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 i9x bkq-1m:qzi;nwr)5mty/ b table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induceqbwtiq xz/r)-kn;: 5m9b1my i s (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 o,oy9:sz ztj*a region where the magnetic field vector points straight up. Ts :zjo y9*,otzhe 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 a leven *c;t3gkosff*zvm(h 0h;t; un dd9j;l table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as ;s zkhocd0g;ftmh j(d;; v nt9n *uf*3the 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 whehyeax2evyc*00 ,a n. hre the magnetic field points straighyea0.yxcv ,a* 0 neh2ht 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 on a horizontal table and carries an ever-increasinhjm3y0b c gkpc/p+*sjuo,;3dg current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induc3*j;cj kp3sc0bhu/,g m+pyo ded 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 ofu i:aq;2mqnkhd 1+q- y wire with the north pole entering first. As the north pole enters the wirehqy ;2aiq+:nu k-1dqm, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constz: te*s,ds)az ant 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 oriente*)d tzs,sa :zation 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 wireryq )v: b,7kgk 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 induced,rqvyg:b7 k)k $emf$ 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.a(dgi*p- im, w
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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 z*w bl-fd +gp2that 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 xgwm- *1kk o xs(q(lt6magnetic 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 moved n g .cey:31lgjs: q 2nmqg1wqh;orthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across thj:n. q :lyhg g2ws qgm1e1;3qce rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a 6rstxtgr.;vk:a z 0u1constant 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 transforhrz*6 jt o0/ 4*dwgsorms

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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 frequzt eewad8.95p dk0omz7h;56 ydvei )vfza,(xency of th;z79zfde 5a a o ei,(kdhdy5.vt pm6zw8v)ex0e $emf$ 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* st,uq8k*nmj 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 de/s7im xy hh7dbo5 u,k+vice 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 prim 9febcfi6ju8 9ary coil thejfufcbi9e8 96 n 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 conta;hrxy) 07wcx a9ap 5loins more loops than the secondary coil 0hc;xyxaa95rlw7 )o pthen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inppzxx+rpc5k6bls1a n ,mq5r9ap. u*o.ut

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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 circu. sz)8zvz j(wuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal mgz/uye7(;k /er*zj:tcc-d gbattery of constant terminal voltage-7ed/y tg (:uz cgrj; k/zcme*. 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 se :flp1)o96 oytnt ppnf2j.x.jries to an ideal battery of constant terminal voltage. jopfxolny n:2p.9)pf6 1t. jtAt the moment contact 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 resistance R is con0 6dxc ld/sd:jnected 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 inductance1vt /ubp-9drug. tu s5 L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 inductol kg. 53;hfhysr are connected in series to a battery. The time constant for the circuit represents th 5fy;slg.3hk he 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 spo4rdy1+cu-lvnh7 7,9r1 isjr 5 y afneries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the timer7 ,i4r1y+- cfnuy7 nalp9h1 dsorvj5 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*p q)y77yuhqyg*ti c-tqa-(o 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 circuit, the currenvnsk,n 6fn91s9b qxej04 ,hqvt

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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 Abtq j7);d 3uibop 0-kdC power supply. In this circuit, the curren but) -d7; k3od0piqjbt

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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 factor when graeu u lj4su-;71 s4uthe frequency is triagju4 u s4l-1u7se; urpled?

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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 d )+ dwctu mc*rpf*+w7goubled, the inductive wu+c**p tmcr7wf )dg+ 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 inductors,av4/y4kp* h enhkf ) approaches zero, the inductive ref )4/sekynv4*a hk h,pactance 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 curcra65b4brw *x*px8 w treb6 xt5x wc*p4aw br8*rnt

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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 circa t/bn,1. op3yivct r1uit changes by what factor when the frequency is triplbr1 i1tc /,y.pvota3n ed?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capah-0d*zvuauf. 8o rs i7-vmkk2 fyb0;scitive reactance of that capacio-7r sib.*8u-v2u dah;mv k00z sfyk ftor

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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 voltages x.:dh:t-minx-r- y8hltf 0 qsof the inductor and capacitor in a RLC serie-:i8hd-x . n s-qyt0t xl:rmfhs 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 circui9ph(oi.jaz0vkd-d r 1 t 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 of the circuit inc c7*gb (fdz9vwreases if R increases. When is this st9fd*(cw vbzg7 atement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance na3nne9;f wm1of 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 in-c d2nv7g p67mwg ay9hcreases 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 inn:picr5j1a 6e an LRC series circuit, the resonant frijance1 p r5:6equency 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 a 6 hv; m;wwkq-g+*paskobv7/h/yvo- rn 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 w1alro)wo -f* ghen

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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 0.10c6c;,vojbu. g m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are par,c.cb vogju6;allel.

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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 unifor x5 d5lu48* ohd6 0,mfrkl 7+vqajtqpje;o so;m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector atsq7;u5lajf ; 5jpovoq x ko6r8+e0*4,ldmd hre 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 rotat7p* cddk pw1vd)v;kb(ing in a uniform magnetic field of 0.20 T. Find the magnetic flux thbk vd)7dpd1*cwk;v p( rough the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area zmrwj 5a c7h3: nht(2iof an adjustable 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+ ind*o*2e +mcfmcqflb. c1k b8(b )cl 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 f6/alfs16mq yd s+s9gof wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly froml6 9ssfaf6/d+qy1 mgs 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 15vro 1ou0va 2yzg 7p(f4 r-c yvuw.g)4k 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 areg*fbu;kb-ldpo+aoad66 3x2d a $0.20 \; m^{2}$ 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 fl;(qrekm f0l5njsu) 13 gtue o0ies horizontally at a location where the (stmgre q uf3lk0e)juo 0n15;downward 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 2.0 m long rotates at a constant ang-ou+tbm3 xvh .ular velocity of 2.0 rad/s about a vert ox- bt3+uhv.mical 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 4 7+7rfis7k 6pkvoekbhas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a0r i7 q),rx:076dbn1+kzur nd eygcy e8um1exrea $0.090 \; m^{2}$ 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 recta* capyk7+m 7kpngular loops 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 the axis of rotation, what will be the makk7cyp+ m*7p aximum 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 okl2p. w;f dw4gfxdrj*qd2s ):m)wg8gf 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 consp1ki6e4h*sgh fh. x3 atruct a simple AC generator with an output of 12 V maximum when rotated at 60 ag hxeh*1p his36f 4.kHz. 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 ymma or2:)4rf 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 ofo/f nobhh,jjc 78u:7 i 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 d.z7dbm8kh 5i W. The motor operates on 120 V A.ibmd8hdz 5 7kC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecaqx/i a )ns8zaz-4j8 ited to a 24-V power supply. The operating current is 1.0 A. What is the st4i8-aa8)nqj a/xszizart-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 ag*, rjdknsws9+r drng+l+ ,75ty/qn W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac /g*r rsq7dlr+ +tndyk+nwgj5n9,s, ak $emf$ 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 toaam2bd 9.sb hs97mc*i a 24-V power supply. The operb2a9*hs i7 bdascm9m .ating 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 re 2opei:(xja 69ng:u7(ewvhmy duce 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 transf vrntxgo +5n80ormer causes 14 A to flow in the secondary. How many turns are in the secondrnvn0 xg5o 8t+ary?

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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-V primary if the 24 zv9yc53 uwy7s-V se9 5cuzs73 vyywcondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn seco4f f zysp: aiw2(sn;+,tq dz2tndary coil. If the cury (2 fqt i: ;s4,2tafp+zzwdnsrent 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 pnvfcyh +p ;j 25y1g5wsrimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the second; 5ghw1jpy2 +f cv5nsyary?

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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 1d6xfu l )y.nhvo,; ma10.0 mA. The primary 6hy;d la f1vu).m, noxcoil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 tu + cfkl 2 -1qzi/.m:irtrdmog0 mej4:trns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vomqgm:ldm.4o+ije2trcz 1 k f /irt0-:ltage 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 +pfd:i7 g*fykits primary coil and 300 turns on its secondary y :+dg7f*fpi kcoil. 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 transfgun3o73bco a)*w p,s lormer has 100 turns and its secondary has 200 turns. If the input current at the primasb l3wo,gu )opn3c7a* ry 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 hky*-(jckpx ey2, u8 l100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seconyk,jxc e k2 pl(y*hu8-dary 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 g b8j9ro; /ouk h zat)mwqp*o*(-id; gand its secondary has 200 turns. If the power input to the primary is 100 W, we can expectuzq /a mt-(jwrkbdhg9;g opo;o)* 8* i 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 2 ,3uil4uf 3-ufbeglz et1)zj 60 A of current at 120 V. The voltage is usually stepped up to 4500 V 4l)z3 t1,2efu -jg3u zfuie blby a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curyjf; qc xj +5j;vop7x(h:v qd4rent at 120 V. The voltage is usually stepped up to 4500 V( +;4: vcxqj q;vjhd7y5 ojpfx by a 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 vol,, 2fkfp04hi7qro gy,fg;w eutage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissi 7,2;we ,ffgoy4r ,if0kpu gqhon line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60m f;nrt+ ef2lg4nf)nx +z u40g W. A generator produces 100 V at 70 A. In order to reduce energy loss due toenn+42nfxg ff+0 urmgz ;tl4 ) heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km l;k/lw:u2dcq f ong 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 tra 2 ;/kcldufq:wnsformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less pow 6(t6od/aokz ter would be lost if( k/t6o6tdzo a 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 en3w 2fb a(jx7rpi(e 9to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be sjpb r72 (fe3n(9we xiatepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energb .rs*mtk3p .1c+tsmly is stored in the coil's magnetic ftm*3 s.lpm1 scbtk. +rield?

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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. What,;ca1 ta s6ywp is this circ1apw 6y,ac;ts 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 wheret o:uvatx. 3xf/g7 fv*l ;sd5h the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120 xp5.hf4cz4jixb t. jhuv-1n2 -V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outle. nq.a. gd lj(bozdl,7t. What is the resistance of the la7(.ndqboj.l ld. gz, amp?

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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. Whke 68 2kowoshty, 2le/01hd73wxk wetat is the peak current through the oldh7w6 k2te, s/k o83ktw2yx1hwee0 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(.8nuhbvva z0-V ac power supply. What is the power dissipated in the v0(.buz8n hav resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i3a8(bk0di ie :pgt. wds $I = 0.80 \sin (240 t)$. 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 resistor is kvyj/qi5,63qsk )ows $I = 0.80 \sin (240 t)$. 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 cph 1 i(m7svy;a 50-W resistor 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 indgvdju7tm9p 8t6mfi8 *uctor 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 inductive6g gvpdsi(e +u l79( d*5gnmdv reactance 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 14.2pubg9kl/9k t gprpa +:*jd;dm n n:w;gpj,+ y0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance atc7 stss)m/s8 j 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 at a frequency ofi8y6,b8+kk9ofh q5tu2hjo ue 20 kHz is applied toeqoo,u8 khiu5f9t+ b8 6ky2jh 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 sourvmx i .mo//i2rdgv:z;ce?

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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 reactancrj q)e: 9h-qtce 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 capacitive r;j s (ayrlz:xc:1, zdreactance 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 1b azu)s5 9hzzn/1ntk: 0-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 o,sv1yp ;avk+ nf a 0.010-mF capacitor be 100 Wnp +1,sav ;vyk?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5m )7tr / k93.oqk5nhhiqpima,.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 impedancxsf1ge0i,1 g1/valgn e of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cafl 1is gn /,exga1vg01pacitive 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 im;nm,,cquys* nql+ysu7(w6aj 9kn m 1spedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedj;*mus,+snn1cqkq 7(y,n6m lw us9 ya 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 i lz0 pq,d vzp4alc974h;x y0ps.vsme+f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected lx+,mp. ph0;v74p09zd4 v lqysezc s ain 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, what islit/d;0khh v1 the impedance at; tdl vkhih1/0 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 a5k ;oacy0 gh6d ic)s+q 20-mH inductor, what is the phase angle at 1di qkh5 0coa+y6 sg)c;000 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 a5 .dnohypbk-: b5 c ej,dcq4ek,af9)0h chb0r series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 h 4bqk -5n eb0,,b:c)c fdph9r0k .ja5dcohyeHz?

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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 capacitancer9f -,iqv6ukqar4j 1ts is needed in series with a 100-W resistor and 15-mHjf,rk9 -6 qiaqtr 1vu4 coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz g6a:nm ply5ut n4 /ik/(zt6.v+n woezfor a total impedance of 40000 W6vynt t+puw 4 k o/(z6 /alzmie5.:gnn?

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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 0(43azvpprn yi)kbr,with a 100-kW resistor at 1.0-MHz for a total impedance of 15ryz(0b)ip ,nvp43akr0 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-mz1c 57n7f 2 f(g cddoq zd(vdnvc2.:6g,orqb mF capacitor. What is the impedance at 1000 2fn qgdb 2o zdgcdd cqnm(:rv1,.zo5(v7f c67 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 neensx/ykyi l53l/ xa7 h(ded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4 l(y/hx 7 liy/nksx53a5 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 ;)qkysz/rz2 y phase angle of ;rzk)/2zyy qs$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neo5s w:4to0 o/r04er xwa8q adeeded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 d ao owr04ao0es4t/xr 8wq:e5W?

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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. What idl:4 7pg7dny z0expz 1s the phase nzd:lzpx1y4 0 pe7gd7 angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH ,antb 1umn2v3vu343fh+ kxt p coil, and 1.0-mF capacitor are conne3t 32,pauuv4n+3kbmftnx h1 vcted 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 100t okhv(o osee/ hb),:td4s(+r-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supk),/ vtt(h (+oso obeed4h:s rply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactan96/at6ncqd ljzu c bj46n: vc (xk(6ryce 30 W, and an inductor of inductive reactance 30 W are conn6t(ncuvjj/yrqla6 k6b n6(: x dz 9c4cected in series 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 serij*hd2a260 fiod 3a py13oiblnes RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to djbl20ipof6ha3in o13y* da 2a 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 f*5z ws deyup3q-i:g / v1iudt6or a phase angle of z-vpwi3*i dusg6 y :5ue tdq/1$40^{\circ}$ 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-+ 9eh)r+zt/cq1zrw ff mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred froft/z+r9rwce1 fh )q+ zm 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 nw:;o r yzj 55)ubwsxn3m ))tzin an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaci)z : yjrsuzwo55) x3bnnwm);ttive reactance, 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 andv( ul r7:2bgrm.yig) AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has hi s/dhe5au66an impedance of 60 W and a resistance of 30 W. What is the power 6s6/ia h5edhufactor?

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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 ser4l7 hf 3oea +jfe:az4/ y8 oq7kug;gtsies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?3la;uj o74h7 o 8+ztafkyggq/ s :eef4

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF yg gri7bd9 *)v; 3xuv z7ewh;acapacitor and a 15-mH coil in series?ey a;gd9v7hzg) *;w7uix3 v br

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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 cw(*fq) l:pd1ev r/o mwith a 4.7-mF capacitor for a resonant frequency c1r*qop :em /flvd ()wof 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 resonant fr4 r2qd;.z.re 5ksyyiac2k,vbww26 2 rluw y)c equency ofq2sy 64kvwd.2 ;wr yc.eu,a yirrzbclwk5)22 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 a 30-W resistor and a 9gkuop m3yq2k wm12o+40-mH coil if the resonant frequency of the circuit is to b ko mg 3+pqm2kw92y1uoe 1000 Hz?

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