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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exch4be.)j 74 xq/ke(vex0cay 7h8r yxo sept

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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 statest v5n(( dl,i;pa756amj 4fnj u73tgld k0 kcsh 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 change on t+mi:nb;ak rq: yb 97t9nmca- wht:r9 ayn;9c abib:mw7+n -km qe 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 of the magnetic field througss8;/6. o j wf5 pmypb7salxb+h a loop of wire produces what kind5 sw.7s; /j6amby lbpop s+8fx 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 diameter of a loop of wire produces wha +ak+k ;l )t9zp*vclpet kind of change on the induced 9ekpl+v c*l)z;ka pt+$emf$, 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 arcgme,s y,,www4,we-;m;mr r magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curren;jd t:q8zndh2t in a conductor will be that which tends to produce which 2;t:qhdj8 zndof 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 fl2 9*s ;v 9rlvq+a9e: a*dm0cmqi9mekp iob2htat on a horizontal table. A bar magnet is held above its center w 999oq be s+m 2dpr* qvac*iv:m9;e2tklhi0ma ith its north pole pointing down. 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 f33sr5-e3bvyj3s- n05cht0 s /wdb,ktauaagjlat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approasge,k3tavscy a30 r3aw5-d 3bs 5 u/0jhbn-jtches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poifi elug c* .22adull;-nts straight up. The magnetic field vanishes suddenly. When viewed frou2*liled c.2l gu;fa- m 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 field vecta hvc0uh/lz08,pa3 d mor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directionpv zhu0am/0 8ch,d3 la 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 asrdo): r: ugo(xhl+b,)u* xvc horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dh s :g)cu*v +loxdo(xr,): burirection 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 horizoxvwn-c5a)6k y ntal table and carries an ever-increasing current northward. Two coils of wire lie flat on the6v w)- xa5yknc 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-j p6vv ;k wju3vdn2un1+w 9lo the north pole entering first. As the north pole enters the wire, the induced current 9wnwlv p-uj6ou jdn 31+;vv2kwill 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 jnw)s4quj(1jis rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magneticn(s)4 w1jj jqu field points straight 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 ro uad3w5yij5;qzk81vm tated at constant angular speed about an axis whose direction can be varied. In a region where a unvmzuyq3k;i w 1d8 55ajiform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.1j+it- cwka vuvu /9kewd( n:,
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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 /p 9.bs(pw c,j cmvj:athat 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 magxk+ fzu3e8n8-.; bylygtmock c67ku5 netic 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 atft8 (oe zu89yi constant velocity throu98eiyuo 8f(ztgh a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates aut8 3dx6lo d0amfwy*6 ex3g/qt 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 frjt;i ;n(cb +transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 r9nq-t3v8*7 olncz vygevolutions each second. The frequency of the vgcv9 lt*nzon 73q-8y$emf$ 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 devicebjxd/q35zjqgp 1 2zm 3 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 device thawr8/x;n1g*.y bmqcr+*l seh ht

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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 containqal la+i3u um2cp,6-r s more loops than the primary coil theni,mqulpr2aua3l+c6 - 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 contains more;e ynebj4x* p3 loops than the secondary coil then it is 4jypn ee*b3;xa

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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 inpl0snr.a 11e,7v 2,/djfn/umly bac6h jg . fryut

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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 c 7z1f: dx prvd+yee89nircuit,

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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 yrg/7*(x 9uyu6wia3fg mmn3san ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resgma * fr6/ y 9gsmi3u3uy(7xnwistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery ofzq62ulle2p 8u *ycdo7 constant terminal voltage. At the moment contact is mlzou*edq 8pl72 y26ucade 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 connected to an iv 9f+-3omvc7ngcw1lj(p x* r e9hhv4 $emf$. 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 yw:7c, b4d s y.-kdste9d(qopresistance 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 indjdb la8 l24g *rzqj +;2bhqfu;uctor are connected in series to a battery. The time constant for the circuit bf+qrbu2g j 8ql4;hz; a *jld2represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery ae o2rqt -7xd/f3 9bafis suddenly removed from the circuit. The txbr fa2d/-7et3aqo9f ime 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 excep+ihupg 6dlk7* t:

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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 cur w41+4,j2luqjaannir; ;x wqk6v t ji3rent

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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 cur;, u,x3hqkrck7cu 6mkrenqck ck 6;7rukmx3 ,,uht

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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 chk1-84gp2rngg68y pnq 1evfi ircuit changes by what factor when the frequengev4 -11f q8nyp8ggin2krh6pcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of thaw4,nad9m5ml p;:c 2 mr n0rtge AC voltage across an inductor is doubled, the inductive reactance of that inanpmt:lc;gn 09m42 wd, 5rmra ductor

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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 aua.d;7i- scl2j ryx4 AC voltage across an inductor approaches zero, the inductive reactance of tha;24.usi yaxjrla -c7dt 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 curr,.9)dis/ax j-u h-lb vwzw,ipenvd xu/ipa 9l),jw.zib s,-hw- t

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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 the freq.(g l+tzyn)p f 9;rttnuency lr;y(gt9.p f)tn nz+tis 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 approaches zez43 rz9l)g xzh2w9qw lro, the capacitive reactance of that hzg4lx99 qwz2 )rl wz3capacitor

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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 vr)bqe mr**ipq1w* mo9,mhu m8oltages of the inductor and capacitor in a Rqbumr*q*1) w h rem9,*m8omp iLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defi:i-.pv*4eerj e5p ltzned 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 if R increase--hu6xwfi(u*+l wb / ybxwk 6gs. ybixhw-+l/ w*f-kx6 guu bw(6 When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance op b3 llxz9*l0kf 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 increasel mrxix,yebdt*np./*d7-s 3 ys 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 t2x 3h z 7p2ymosah20qnhe capacitance both double in an LRC series circuit, the resonant xzhm0hs 2 q2n72 ao3ypfrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC ap wtofj05 s46 u8s -gitlf0wj1 v;vi4, ,efrabcplied 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 cir5iz n4b-r l/xbequ) d-cuit 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 is rotating inz :gx*o3g3p ti 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 p 3zxtggi: 3p*oarallel.

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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 radioqg qchr331+ddb9cn 8 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 1qg38dh9nbc dq c3ro+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 i6zin8* v6c4x5ydcn 7/tqyjw of 0.20 T. Find the magnetic flux through the loop w65zijvn8wtc/ q4y d7y icx6 *nhen 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 isk ty s8u y,:ugeor(o3, 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 f ;mp t q0m2atpb9; owq c7/rcc7v,,uacrom $4.0 \times 10^{-5} \; Wb$ 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 20o9y)obid t/bhe-xr73 klu 9h2b pcwi/ 1ea;p/0 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the 1dp3ltybw/7k ipr bh9i/ba c-e)/ ;9h2oeoxu plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tu7sty- wj4rcpv9w0t3orns 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 areqdl;ro+gzb5kaq8p, mw8 z w-5t9k 9 waa $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a o4 6rihmnd ll 5x:my+yd4.2hr location where the downward component of the Earth's magnln h4r:r2io d5m6yd+h xm.l4y etic 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 angular vel1f 3u *i-y/bll4dxbux suxpqbn6-; (oocity of 2.0 rad/s about a vertical axis through one of inbx1*q6;fbui3/ d px(- lxyuuo lb4-sts 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 cro1d,ikna0 q1 ezss-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 are 8pbx km44q1ipc50brl a $0.090 \; m^{2}$ 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. Each loop isyu1m x)jsup 3nax m)a q9q4-f4 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rq ux m4qux-)p4 yaa n1)mjs39fotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consis c+. 0e-dsg+ oso9y( n e0ttj6z2usujdts 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 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 generator with an outpu 3hd0r6t w1ia 9pm/0zvdxs r4tt of 12 V maximum whenttasdd0z 4h13 p9xmvrwri/ 06 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 genera14j cow*wbvvj- s 0w+gtor 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 mok,fr(l5 wvmqts m;xux) m3vbp)u,08c tor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor ha6+a+hb zxa 4fzve a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bah+az z+b4a 6xfck $emf$ 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-;el ydynv-wk;hi84u3 z/c- rhV power supply. The operating current i3eivzn -;rwkl h/udyyc -;h48 s 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.jzndg/2ovrf * 99 55jfioovj p;l u68m0 W is connected to a 24-V power supply. The of9oj/*po 8o ;u529jrfiv6z v5 l gjmndperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanc6w1o+ogxoti rv2yr, rl .b7+h e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacwxvrryorh67t +,1golo.2+ i b k $emf$ 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 t+e9 mlzntcqo),x0mu)d6 9vml o 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 transfor,ykaeynccxtj1p) /s6k fg5.; mer causes 14 A to flow in the secondary. How many turns art. ) a,nscpjx /5g yckfy6k;e1e 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 nej6mkkkv7bgv7 n ) 9u8qcessary in a 110-V primary if the 24-V secondary has 100 turn 68)qmk b7kguvv9n7kjs?

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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 prima;j*fjrd 4 mn 8mdfh8l5ry coil and a 2000-turn secondary coil. If the current in the second j8 f*n;h4 m5d8jmrfdlary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% 1xc0p9q ; je1xyz:dv nefficiency, how many amps at 24 V can flow in the seco9zeyqcn:x0 1vp;xd j1ndary?

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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 transformep/t;vbyx8 m3 dr provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What p/tmy; xv83bddoes 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 primary coil and 30pth33 (ovdc2g 0 turns on its secondary coil. If 120 V at 2.0 A is appl3vc 2dog(ph 3tied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 3vapjf ;w1+ /)h ijove.00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whatjhj. ap1vi)f/ w+;e ov 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 secondaryqlg./ e7w++9yt l gdiv has 200 turns. If the input current at the primary is 100 A, we can expect the output curr dw l7tqe/y+i9l.gvg +ent at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secu0) xt2oe;gsbcaf+ty y j2:3 pondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltageb+u tt gcyf:;yoe)2x2 3sapj0 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 secondtxe;q+5 ea+2jsq,ehyary has 200 turns. If the power input to the primary iqe,+j; 5hx2 ye+aqt ess 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 sfjdcf+t9g5 lz5l3m * V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if th35dl zfs*tcfg +9jm5le 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. Th0mp f38qa :*mqak fl2ye voltage is usually stepped up to q2qmla yk0f83* :paf m4500 V 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 )c mg2fu:lf6dtgdo z4wt (m 8zp(wo(4 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the pe:wf(2(upm8 moz(tcdlg6 zwd) 4o4 tgfrcentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A/dekpio*st3: 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 transform/3epits:d *koer 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 totalicq6s0 0oiu:v 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, tiu:s00q c6ivo he voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less 76;q *-k7nezcqh -yi pkav)ey6jlq5dpower would be lost if the power were transmitted at 3000 V instead of ay76 n jhz d-)l;yq qekekp5vcaiq7-*6t 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 2govz2 /za;mt:: e(sj v0 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the pow/:tvj ga:(;2ze ov szmer 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.at3r zhy;eji /q0 p*j4;+k piv How much energy is stored in the coil'q;04 zea3htprp;v+/*i ijjky s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What i8 wr-qo h 0vv0pyn1c1;sy;vnc s this circuit' vv1 0ncr; 180hqo-sypwvy;n cs 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 wh3id6, : i;crzrx.oayhere 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 cgfl uo f+8/6ep( +ymxinto a 120-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 outlet. What is the resistance of themdhdcf/sx( 8 4 gihp)esug6(; lah6g)8 /i gfm4d;s( pdhcsuxe (mp?

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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 : k4f guymo*w+ac power supply. What is the peak current through4my+uk* f go:w the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the pojvl;5 ((sn,b g/rm1p ie,jw uebcf. 14hdf- cmwer dissipated in the resis(m1 ,f1;r(,j54 vbc pd-hbjsl/wmg.ce enifutor?

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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 i/j9oxrbv8 qwone* ew1 tg z:*4s $I = 0.80 \sin (240 t)$. 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 ngv02 rml5k )gmpx+s:$I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor seqsb5w5s,q* o y41 ,f)m qhe.li3fh sis $I = 0.80 \sin (240 t)$. 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 inductor at 6zxk)q7khjf,d 5 9fbk vdq4/.w0 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 w29e;rii bxmj0 la6u j0dl0q,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 wil)-1cgyeh2+au4xc pf y l a 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 of inductive rst w ulsy9v: g7j2,4y hd84dbreactance 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 auxww.ptfj(;- : .i qajjb6f +zt a frequency of 20 kHz is applf uta;j+wf.6xj.(biw- qp:zjied 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 a y+u7.jtwh2g p sb/b/2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cap+tpasb jh ,7 u2oh6x7pacitor 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 g3e7p n/ 2islyhave 50 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-mF cap03w9a f uf:rbeacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF sk)s4qraq.)k)3n 0:ssslf ,yrnjq2 c capacitor be 100 W2kn )4q:sf)jrraq s)sc skq .3s,yln0?

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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 throughsvkp )9h*wxy+l3d5x)n auv d. a 0.0010-mF capacitor 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 )zj+ m cr8uj;qac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W rjczq m;+)u8j 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, 20-mH coil,7vj s*ca) uu5)my4n5 vscj2v m and 1.0-m24c7ju*um5)v5as)vmyn j vscF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF vznd 9z-7i-tullc(cc n20+ gw capacitor are connected in ci z-n7(vutgdn29-+cl0czwl 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 isf q1hkp he,13w2b )b s2nrx0to the impedance at 1000po2w x2 )re f0h1bq3,s1bthnk 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 wiw6- m lnn1,mdlth a 20-mH inductor, what is the phase an6dnlmw-l1 n,mgle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capapi7- gmit 2fm(xn ,h6pcitor for a total impedance of 100 W a gtx(mpp-h62 ,f miin7t 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 capaciol ydw:9fal)2n ;x 0qw f4;epkr;:lndtances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 1k2 yl4lorpdnf; qw9n: xf ; 0ed)alw:;10 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 23nlkl/s ,6pa:/kfxh3hkfx x in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 xxk3xs6/:l p ffa3 2h/knk,lhW?

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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-e+,l, q6zj2s0-dtaj l :cmno mme2 :uyMHz for a total impedance o oq2:mc+e6dy, alj,: 0jnmlt-mse z2uf 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 2r 0ug427(p ookn)a giv0-mF capacitor. What is the impeda2k(7)po4 ranoig vg0 unce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10i;n wy*nokuei( d7;nc+:i-jf-mF capacitor at 1.0 kHz for a tota;ne -kiciw; (y j:7dno*n+f uil impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for atscano -z8;- qj lv1*j phase-a8sc tq njj;1o* lzv- angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for dla 4srga+b. se;4m+t a total impedance of d4g+sm l4tr;a+a. sbe 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 il2t1xv ybm4xjvk7 u +0n series with a 100-mF capacitor at 120 Hz. What is the phase anlmvb27v xtuykj+x0 14gle?

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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 11oqd(.q3t m.djqvs t /500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c3dsqqv (o d.tqtmj/ 1.apacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, y.gva u2jg4s a(t;z)la 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What ;v uy sa2.)tgjagz4 l(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, a8 d4i/p*gd kqp9 dxwe7 capacitor of capacitive reactance 30 W, and an inductor of inducti k dxq 9d/*84wppegdi7ve reactance 30 W are connected 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 series RLC circuit containing a 506p k7da/sd nnv8, qz*y-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe n7d ,kq/z* 8spy6nvadn connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistos8oy2w-7nl vo3gq 8z sr for a phase angle of gn783vsysz 82lwo-q o$40^{\circ}$ 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, zn hbe 0qssi98 j,5h/qL = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dss ,/h0bjq95nz8i q ehriving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 Wm(4lkmv0 q xvodoog32;e 0ah4 inductive reactance, and 10.0 W capacitive reactance, when the circuit is conneo;voqvh3gdm(00 24x l oaem4kcted 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 A bwfgvy td3v:g2) x,8 n(kkno*C 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 an impedance of 60 W and a resistance of in+4n5,)vtdjqb sq8 n 30 W. What is the powi,4 t sqnq8dv)n+nj5ber factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circ3c)sow//c9val7p 3ko*aks k juit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sacp73 *9oclask w /kjv) k3/soupply?

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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 fr g:lcmp; d63j sic9epmrd+l-+equency of a 1.0-mF capacitor and a 15-mH coil in series? ri dclms+epp; j+3l-d96g :cm

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is ne-f+q 9n frux( jxs1q6meded in series with a 4.7-mF capacitor for a resonant frequencunq(9rms q+x f6-1jxfy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in se *qor-t kh 3p-qtln2s7ries with a 3.7-mH inductor for a resonant frequencq- k2hsrpln qt- 73*oty of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 3qi6 iq q wmtzn( tcp8(,;m6r;w0-W resistor and a 40-mH coil if(wmwr q ;6pn,86 i;mt(zcqitq the resonant frequency of the circuit is to be 1000 Hz?

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