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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 magtrod9 -;htk-j netic 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 inductio;kkp/b toil3 2. ql9sfn 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 what kind of(d9 c3fii8 jht change on the induc 839iftd( ihjced $emf$, 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 d7 ea4gw.rl6e kl26eaukzs,*pdov(.u7z :qf wire produces what ki2( rl, zeul:egdev6d7awuo.7qafzs6 pk4k*. nd of change on 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 diametercues4t8kd00s9 z zq 2c of a loop of wire produces what kind of change on the inducedkt c 0su09 eqd28zc4zs $emf$, 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 xqo* r+gy,xr p8d.ai9field 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 induc z9 pi9gbb4if cyee:8;ed current in a conductor will be that which tends i ey9b9bcg:8z;4 pef ito produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is help8(tg1w pb3kc-k af, ha/aq2i d above its center with its north pole pointing down. The stationary magnet induces (when,w-/ i2pt1ckaqp fgh83baak ( 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 horn9z 9 6ktz0wa;g.pplf izontal 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 induczk 0flp;9 z6wgpn .9taes (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 veqayz,s9l /nb;6es3b k n)c0jf1t.b jwctor points straigh1w,j0ks.ezsn ba 3) 6nlt9 fjcy/bq; bt 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 a level table top in a region where the magnetic fij-zis5, - fmzfml:as: eld vector points straight -zail: s,fjs:z m m-5fup. 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 the magnetic fq hfeny kef 92d45cy0i/rd0v/ield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction5enve/d 0 q/fy9rcy240idf k h 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 anvnj(u+8awa) b ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewvj+ 8aun )(abwed 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*lq ,r30cvi4echb :s rnu2jo 6 with the north pole entering first. As the north pole enters the wire, the induced cu cslvcq4 j6nrh,i:b*ure 0o32 rrent 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 row-u qv*fjd 1h:tated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strajuhd 1fqv*- :wight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an7mxcv+* c 4nzr axis whose direction can be varied. In a region where a uniform magnetic field points straight do+m74 cxzc* nvrwn, 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.0xo0gy r*jxv.6)uhz8l jlo ( a
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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 that an / 3b3v d7lj8-wvhptya$emf$ 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 mad.uqsl4t al0( gnetic 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 northward f jly6n st t3yzfli 5,*)6x+iaat constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inducex3tl6l iya)5y,6+ znfs tij*fd 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 rotates at a constant angularcukdjs/mpy2c :9nec1 ; azc3- 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 tr)7mjlylyks )7 ansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatm6lmoq2- xwvt6 2 fpg)es through 60 revolutions each second. The frequency of thvmf px gm662wtl-2 q)oe $emf$ 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 usede+s m stg9a.dj k6z6-w to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device w7 klift ,45vethat

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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 primary cocy tnx)i, 2n mo;j(vd9il ni9n xyt)(,2o; vmcjdthen 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 7q prehxzq5j8ee0.-8f/in bw contains more loops than the secondary coil then i .h 0n7eie x/5jrwzqb 8q8pfe-t 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 k7wm8fzq2n3 opower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant c3b wz)e 3qzpk/ircuit,

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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 2qa c7a4/qxcy w7hy,pto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is/ cq,y7aya7xh cwqp 42

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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 ba1 a ip0k0nw8xqm 0jr7httery of constant terminal voltan807i qhj0xpwma0k r1ge. At 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 s8lin4 b0-xo6hr p5 m (:7yffjui6kl nand resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inw1x-6rn pq *daductance 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 inductor are connected in series to a battery. The time cons )j,48rpkcwp knz u :mwrj-.r6tantzp:68uw )cr ,. k4nrm-w jrjkp for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor areoxla-1 l6ys8ww; 3e+x )o jb7 y*bokcr connected in series to a battery. The battery is subabo rx l6w o*j)8lk;esy-coy7+1xw3ddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have t io0qjj2h4 thnge833lhe same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circ5a iu34ye skb8+d 9tjm0u e+pbuit, 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 this circuit, the curren4,b;ul-omxp sbspcx, f i6/o3,b3 64xb/u xo- psf sc,;mipolt

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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 chabrbw(/tl4xd.-)q o kohf (c6 gnges by what factor when the frequency is tx/lhcq owtbk(fb4 6().gr o-d ripled?

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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 thvhum1rl*sbp1e( +: a u/ k+zfdn *dem3e AC voltage across an inductor is doubled, the inductive reactance of that *av/ np(e3d1:z f+d rk+e suh1*lummbinductor

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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 tent8/ .bskop u71:pofhe AC voltage across an inductor approaches zero, the inductive reactance of that coilos/8.pt: 7 u1kfboep n

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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 ubatz((/ ge0 gl4+rascircuit, the current(4gt/gszela 0 +ba r(u

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when to*;amzq. a tx-n(5w ;kn 8etr ld4cco2he frequencw(o;zt mna 8r2 dl-k5;txn*eo .ac4qcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approlwg9ru ff rv21i:f- vpb82n,aaches zero, the capacitive reactance of that r2a8, f:vfbrv-pl 1u inw g29fcapacitor

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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 voltageh,yk.zn e )b6us of the inductor and capacitor in a RLC serkn).6 ehu,bzyies 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 df).8zqo0(up x z2kiqzefined 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 increases ik :qm7m. ;95jzgbevkiogz 1 n1f R increases. When is this statemeg1 571 ivmez:omknqjz9bk.g;nt 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 of the cirmc9 e0w+7wxd8rwb s0 kcuit 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 increases 65;rmp,bc9h(cluc:x a ur8vwn 7u( kiif $X_C$ 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 ,lqcq-o lqncw o4;h:fy :b * p,1ka8vpcapacitance both double in an LRC series circuit, the resonant frequency of th cnq qp,k:vfpc1b, l8-a*oq l;w:4y ohat 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 apz45oyjf();nf f0+flj uslo g (plied 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 cirt5cox+se) z2:t 0xrqccuit 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 radi,z d5gvdsj7kvv*r,9o,3d+pvt tbk0z us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecdj s7tvpb,ogvd39*+ k dkr vt,z5v0z,tor 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 radiu8qxl6l,( +;l lkpvzlq s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find theqqz 8ll lp6,+v(kx;ll 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 a uniform magnetic field ks8upf 9 (*, .5leunuucze7 bqof 0.20 T. Find the magn u c8fee7p ks(,*9lnbu.5 uzquetic flux through 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 of an adjustable single loop is reduced fr)i/vtu f-awj/trzn;pz , igw 6f195twom $1.0 \; m^{2}$ 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 colhl :sm ke6nyo,4l tb56m2*mcd5e 2xjil 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 frame with s5ns6ap;z * (epi 1hpciides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes 5i1nsp*h p(p;iae z6c 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 ui 2rb) 9-pbogwith 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 gpr(u8zf;7e fand 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 ag6 x)q e-zi wu.sljy11yuvn7* t a location where the downward component oywl 7*isxeu- 6vyj)nuz1gq 1. f 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 ci, 6e9s(* s-pm 9o:cjjuktysu nwu5)sonstant angular velocity of 2.0 rad/s about a vertical axis th9,jn*mj )tsei kss56c 9puuo-u :s(wyrough 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 and2-q/.dfk kajw l4hsg d/l1/ba 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 consistqy ;/h5 m jqnh*ks2lq8s of 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 rectangula a.0 2ycf;71oovcj wo/ngvq;.aozrblyb 8 ,l2r 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 perpend zy,a2q1/7.bj gavnfwc0.yr8ob;;c v lo l2oo icular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area oegi p5 h ne4jv lqdxl2y 08,tu(*:ue5$0.090 \; m^{2}$ 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 hc:v 7ci3ho(lto construct a simple AC generator with an output of 12 V maxic: ol(7hvi3ch mum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator ;j p 7rkf: h0k.h d, ig)zbf5ybi)iw/vwith 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. The motor op 7juf, m(mu1vherates 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 hf xff7jnq3dj5nd (h- 5gs)*dok6 8iu wave a resistance of 6.00 W. The motor operates on 120 V AC, and when running 7fnfhg8u *d(jo idj5sdqw3 f)5xk-6 nat 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 ru9/ry 42dgmf8jly,r/ grx 9gyesistance 6.0 W is connected to a 24-V power supply. The operating current xg2y,mdr/8guj y9/f r 9r g4lyis 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a v7lhw b cf58,bqx.n,q24-V power supply. The operatin .vb,f,cxqqb8 5ln w7hg 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 internalizekm.r 00 r)l resistance 6.0 W is connected to a 24-V power supply. The operating current is )0 0lie.r rzkm1.0 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 transformez/gfk 3nb5 +km)q0oqc;z (texr is needed 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 14u(/0l 3zbfpon A to flow in the secondary. How many turns are inu0/oznf3 ( blp 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-V primary if p8pww1wc gr80j1 1 k;iuj kph-edc/ r6the 24-V secondary has 1-p6i p8wjkjk1 pw/hd8 1ucg;e1 rwc0 r00 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 o:vw;mllyj). kf a 500-turn primary coil and a 2000-turn secondary coil. Ifmw:;l) lj.v ky the 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 transfo hmu45p))9wng/i i5 efqgbf3 xrmer. Assuming 100% efficiency, how many amps at 24 V can flow in the seconda 5ui fghie/5w) x)fg m4n39pqbry?

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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 transform s6;od e xm.yzd; b/v6e0pg2cger provides 7500 V at 10.0 mA. The primary cg/ m6exp;e ocdgsb y6.;02vd zoil 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 turns on its pdds27 9ozqbfy. 3t 64use6m/j dq3thmrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present7q dt663b9esd4mth d.o 3/y2uqj zm fs 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 itspnir*lsx /ip0gt+9j, seconp/in l*t0sji+x rp9g,dary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20a4uehw5v bk3+4vbl9 b0 turns. If the input current at the primary is 100 A, we can expect the output curreuk9e3b +4w b5vlbav h4nt 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 transtj.6yaa* g a/hformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100. tg/*aja yah6 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its second7+o,t ve iatq( vmy0*ok*f be0ary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses tq0+*o fo(kt 7ieeb *0mavvy,)

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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 Ai dft*s 5x ,sj5*wyx0k of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0i ,5st *f5ksx yj0w*dx W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tt ,7(i 8p/nwzitb /cdfhe voltage 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 tcnpti 78f/dw (/tz, biransmission 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 ai +dcotd-p20tw(ve6tage 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 -cvdd+2p o wt6ta0i( epower lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total ou(3m u6dgz*cresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissio(3d6gzouc* umn line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a to 8i ps)7rjjm3vtal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the i pjjvr3)sm87transformer 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 powk+w3gb cq)ha7 er would be lost if the power were transmitted at 3000 V insteakq3hb )7cgaw+ d 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 agytiyym551w+ lft.0 syt2 -q. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the powy sft05 iyamywgyt+5q- .t21 ler 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 energy is stored in the coilwi. v-*4nj q n-r ;hrzx:u,epv's ma,wnux-i r4np-hv v;e zqjr*:.gnetic 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 khzbu qcko+3u2+b 0 2rand an 18-H inductor. What is this circui0oh2 +2curkbk3qzu b+t'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 volt; 0b pt qwxid8i)*wvp(age 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 htm p36 zcu) t8ccz .be,d++lo1kz7fz 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 outyenif l13 v:p3i 7x8wnityno,(by0y, :pu 0ojlet. What is the resistance of the lamp0ltyj:p3v f w7y ix(3e0u8,oiyy , bnnop:n1i?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the+ di5 9e7sozt9ip l,l+e8bo xk peak current i 5t +sz7,k+l9e ibxlodpe89o 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 kixasu6l tpy4i 9b*;k*5 v6af a 120-V ac power supply. What is the power dissipated in the reivaia6*;xlyt4*spk f b9k6 u5sistor?

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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 w002s*nic: m51 b bl7-mj q,xeskotmkbuz -r* 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 98 v diz6:q+n ewu49k+w veszgbes)l:a 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 506 1asw-azw46xaij8 f o-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 lc1olar :qv/zgj) 35d a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a-jrqee +nu m a :0a5gfdop/.qo(-s 9ey 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 s2:ti wsa45)do kcox* 14.0-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 of7c* sog r r+o0;pltj;v inductive 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 wh cw7msbfysl4a3 88:k gen 120 V AC at a frequency of 20 kHz is appcska 8l :48bw ysf73mglied 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-Vl; e ybo6-)vd5wpu6r)hseal1 , 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 re d,sg5ezmtln 1*11 dgeactance 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 9xjs-( :ivxryy,9fh6h*ihojk q b6: w of 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 does a 10-mF8dk rj6us tw7g4 (fc-n 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 capacig.i ac yafi;f d:-f2l,tive reactance of a 0.010-mF capacitor be 100 Wy.difif;,-2a cl: agf?

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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 atc n4(7x o2qjmt 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 zbvzxck 6wf cq ,ai:l*1nd97 fvoi5-n96+fcvW resistance, 15.0 W inductive react:z wc5fnxav*f-dvilc6b q7+ 9o6cvz,i1n9fk ance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor,c vtfhg25 ml-+5ypve; 20-mH coil, and 1.0-mF capacef2+ lv vt5cgm-h y;5pitor 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 weft p(h70 w0e otsb4nj.5;hva 100-W resistor, 20-mH coil, and 1.0-mF case7.nf( hb4 0jv 5hoewttp0w;pacitor 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 i4-w1uxoar ifbp5s 67m s connected in series with a 20-mH inductor, what is the impedance at 1000 Hzxoirsm765fab4 u1w-p ?

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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-mHa/1w)-ywd w qq inductor, what is the pha/ydq-1)aqw ww se angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil an+ n,ji4hu pq 3/ttk1hbd 1.0-mF capacitor for a k1thiu qtp+ /nbj3 ,h4total 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 in series wit1tjk7 e,c blz w,07vxt)-kqush a 100-W resistor and 15-mH coil to get a total t7,xktu-l7bc)1ke z, v0wqjs 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 50rt58ch4cr) mszrw y up:d2s ;*8.vgfu00 Hz for a total impedance hcycr fm8:.p8u)g 4s5t2rdz v ursw;* 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 at 1.0-MHzhpj.owg4 0tlf;me c6gzp3/ 3m for a total impedance of 150 w630 jhegpf m z tgo/c34m;pl.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 capacitor. 2u;bcx dz/kh, m/ea8l2lz5j uWhat is the impedance j lc25x z8,m;du zh2/b/ael ukat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in seriepg7m17 b:/boy :qer- 1 xcyduukhm .y/s with a 10-mF capacitor at 1.0 kHz for a total imr/ cd7q7mp:bmu1y1e- byuhg. oy:kx/ pedance 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 xn87gwhr0lwh 9a8l ;y capacitor at 1.0 kHz for a phase angle o whgawy xrh8l7l890;n f $40^{\circ}$?

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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 apor+x9 8dq:x gj+zif0 30-W resistor at 1.0 kHz for a total9 pxz+ 0xog fjidq+:r8 impedance 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. What is the 2mik)ieo*- +xq7 nw/ mht,iwqphase angl*2q i+ow k,7wn qmtiehx/mi)- e?

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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 coil,2qhs54r r yo5j 2nkod 6yxl 36(vjls+s and 1.0-mF capacitor areosjv(krnsy62+3x2sr5j l4 6 ohdy 5 ql 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 a zmxtu)majc 3nk: y7a:8 dj x*60.350-H inductor. The circuit is connected to a 120-V, m:6j :n)myjxkatcad8zx3*u7 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 capacitor l)p 8izlpx*(n of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to n*8lpx( )zli pa 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 angl)ud/7pt.3.lop +web;oz,uoncy0k il g3 aic8e for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppltleiwcy g .iu0ozo lp8b/7a.k+uod;n, 3p 3)cy?

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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 gwd/dq 0 u7vbc-mwm5ws4;y6y )2ursj in series with a 500-W resistor for a phase angle oscd 0-y5 qw/r7ud2s46w)gwm bu yj m;vf $40^{\circ}$ 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 = 8+q/vx;gt t66q csbtz20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the tc q6g qvxz6 bs8;t+/tdriving 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 1dx/t..h)n7uxp9fw 4u /l. xmlrsn4 + tvpil d+2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conn. 4h+d.sr t f +i9lxwxdvn .4nltlpu) mup//x7ected 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 circuisav pqwv51 vd/d 97kxh5 uctr j3..jo0t is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and eh 1qzzk1g;g;r, :qje4rl, yia resistance of 30 W. What is the power factorerg; ezr:lq q4k hj,,zgyi ;11?

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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 ciy8fq2 h cc(/xontaining a 50-W resistor, a 10-mF capacitor, and a 0.45f 8yi2(q /cxhc-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH i.1.3 5fh qy ttfla/ty+z-ylycoil in series?z 3ay q/.ffyli5 .yt+ y-tt1hl

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant freqz kbkh2 au 0er*,x.uc+s)5 spnuency of 10 ks*2,a brznx5 eu.s+kc0kpuh) Hz?

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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 inducto1qv4/b(f q*gd r kyj9a:g2k sor for a resonant frequency ro/d :jvqfgb( ga* k1 ky2s9q4of 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 qu5bvo2 7/o r npyuo1)series with a 30-W resistor and a 40-mH coio/5 opu1)2buq rnv7yol if the resonant frequency of the circuit is to be 1000 Hz?

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