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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 ug y:, z6 fqppi0ln(thaz *c)2tnits 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 induciau.(4juqr 02*cpt9f fpi*gytion 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 c42r.boa uei(f3nen34 r put7voil produces what kind of change on the ie3trbenn4 pf.23( 7 oa ivu4urnduced $emf$, 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 th4wpu ;1:uy9gt4jti see magnetic field through a loop of wire produces what kind of change on the induce1ut j4ep siwt;9 y4:ugd $emf$, 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 wirovswtk .xared(6v)za zf .p),eyc 34(e produces what kind of change on the induced kfc zot36(.(pwevyz) rx).4 ,vsdea a$emf$, 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 magnetiuo noif+(fr61c 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 inducenei 2)0h;ff cqjzmx5 ra dt7(8d current in a conductor will be that whi80q(;nh5j fmi2 rtedz)fc x7a ch tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hejj8- ha 5y+xmeld above its center with its north pole pointing downjea+y5m-h x8j . The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal +y eeml6rfi ;-uj s7b3table. A bar magnet is held above its center with its north pole pointing down, and released. As it approache73e e-fl rs;+myjiub6s 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 magnes+* fn(wpkc n0gsl5iffi*s .( tic field vector points straight up. The magnetic field vanis*ls* f.ws+f(fn0 kiip ( gs5cnhes 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 agy7 .x 6o eqzk5u-qf5e region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When-e 7eo6 k5x.gqyfz5q u 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 ,2ajj s k4.tsdws4;+t pvzdz*l al;1a the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as thew*.a 1k;dtsds; 4avjjl,tlap 4 +2szz 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 horizontalo ybwt uc;r*38bv.;qv table and carries an ever-increasing current no uc bq83;w o.*rbytv;vrthward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first.+.qxen/2 6h lcmaw p7u As the north pole enters the wire, the induced current will be (as viewed u6epc7q +m ./2 nwahlxfrom 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 constant angular speed r97e+rta(c uc about an axis whose direction can be varied. In a region where a uniftua9 cer (r7c+orm magnetic 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 rotated at constant angular speed about an axis w s1slak7) jz4ehose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation o l1z j)ss7ke4af 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.jzaqfd , y zan7 lb5 v,*.*wr)sc3y/zb
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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 )paq (lm:zu*f $emf$ 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 magnetic fieldq(, n,moh ,d)miah t.a. 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 do (sak+s pbj:gxuqb4 37a d4/iirection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acsib4j : ( + d3bxuoa7/p4sqagkross 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 ny3d vam4zi+ ) (jzyx;at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatornw b/bjkpz.ol0vns 5dk90-0 y 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 revolutions each secon9 -gpzk l1sk6md. The frequency of thekz 1 gs9km-p6l $emf$ 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 usedibqb su-a3 29.k kd:5 xcwpjo/ 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 devick6b fg k-q+oj3e 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 th+a9+/c5a m-wngsb wx z*)fmvwan the primary coil then it is a g9-z)/+5+ mvfsaxa w*nb mwwc

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondar4u 5 i2vezu; ln 2jj7s,wrrt5ttlc*y-y coil then it iswyil 4r22 z* ;5njtvu5 ,lsc7tetu jr- 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 ykx4r- m ,/lx vq(/dcginput

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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 4j59.jcnj g-liz9ly.t bee:f8r2c tx circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected i ,8tqe, wpcuuh:fmn-9 n series to an ideal battery of constant terminal voltage. At the moment contact is made wiu-u9f , hcq:mw,p8tenth 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 co:rak,-():js,b0+ dtq ;vjc mgsci7 l1nsyg ndnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage njg: k) ,c+g, jl7yd s0;vdsna-1:(tqs bm rciacross 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 connectedmn )/pqcy y 979fjxmf; to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected pv+eeyp y x6y11; g86gzi*j wtto 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 t1f :nb6s2uzi2wg2zu mn1w5udo a battery. The time constant for the circuit rzsuz:m 2fw1nn bw 22u 61d5iugepresents 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 battea )(r 8jcfrg zi3gj.5bry. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the ti 5ic rbg)(ag3.z jf8rjme 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 tts;a; iiq:r+ r8ja9wrhe 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 circuit, the cmy ir(z()94 6z8dv 0 4kzvsjxxz:qdviurrent

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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 connectedrfx4h;pp :2 a kz.0dau to an AC power supply. In this circuit, the currentzhakxu.4 pda20r:p ;f

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancap+jbvbujs+.k cz 68 5e in an ac circuit changes by what factor when the frequency is trica pjz5+u6bk b+vjs8.pled?

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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 ineq7i.9vgq, om h6 hb5bductor is doubled, the inductive reactance of that induqhe 5,h 79m iv6.oqbbgctor

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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 A.4g a )uuklo;qC voltage across an inductor approaches zero, the inductive reactance of tha.ga4)u ; ukqolt 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.q6 cr811 qrde6bh2kua In this circuit, the currendh cqqr621 a rkub8e16t

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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 bz6qxfe7; )tl sy what factor when the frequency isle7fzqx;) s t6 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 zero, the ca 9*ucj6d aiifwp12v8ypaciti vufj6i*28 w1idc9 apyve reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betwenmdyc. 77 e -+4ut+gkmdx6kcien the voltages of the inductor and capacitor in a RLCm ccg64 t- i.xd7emyu+7kkdn+ 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 RLCyu ka801 bvt7u circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Thbwd/ -)v0qm kje impedance of the circuit increases if R increases. When is this statementwv dmq/) -bkj0 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 m/3gm lvt(vr 0of 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. 6 /9fdo zcy m//oydz6n The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series l0vg *gae(l d:circuit, the resonant fl(davl: 0e*gg requency 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 applied8 bfrlc evm 0 *u;td4hz+.eni9xx od,ya r9s;( 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 q en*2y-kxhw uacz222 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 in a uniform magnetic field of 0.yy jfm+ h9gs(rjo- y-/x5i fl.20 T. Find the magnetic flux through the loop when the oxf/my- s.l jfyj(y-g5r9 i+h plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating uqemqs-6:)w l7zku;uaz2kx*in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of tqu)-ua:z 7w2kz;q sk x leum*6he 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 0uw j qd.8c.aj(hzl 21j.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 an1lj(.j uc. w2ja8zqd hd 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 adf)7ea w7v,sbxv ibj,u/7qiu5justable 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 chan8mn,v8)kqu z islk fmf+;s80y ges 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 siig0d u qe)um5)des 18 cm. A uniform magnetic field is au5edim )gu0q) pplied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with ij(.gq/ u8g ifo9ba8x15 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 areq1bm y):gy v2qa $0.20 \; m^{2}$ 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 location w- 5xypak4xnc 4here the dowy4-xan4 xpc5 knward 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 aa)6qsn 32 oisi+;j asj constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field ooq6a ssj nais +2);3ijf $5.0 \times 10^{-5} \; T$. 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 hiv/j)lc n( ra6as 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 cons-wo6 ql+yoci 4ists 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 rectangular loops on its armature0 i mtt61uq xd,n1o pbd:+a2by. 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 maximum output voltagedt:,t11id yxam 2bbuoq6 p0+n 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 1*a , 7cu::oit1ovkvnc00 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 output of 12 Vgfj k 9pbcu;38 maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If tp ubcjk;f3 g89he 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 muc3n4j b pbs) g4/m2vvuo:+ca wl+*y generator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The rxzn/7to2:zndvnc 2v z ,a;x4 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 resistancys/ 2:h,nuwe je of 6.00 W. The motor operates on 120 V AC, and/sy :eu,2nwh j 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 connected to a 24-V power ijud.0 d- o3hy msda74supply. The operating current is 1.0 A. Wh j u4disd.0a3dy- m7ohat 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 isu/tap s9zz o (t 9m,r,f6q7wac connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whatwp tma(z7z fr,qt,6u9 c/s9oa is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected vug8hx zic jv(ju/- 96to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back x v i9/vjjh8( 6cuzg-u$emf$ 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 reduce :thn; y yjty9(y q2 18dnbg-ru4c*egu 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 w0m;aives; q)14 A to flow in the secondmv 0)as;;wq ieary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessarytyh33vlh8jd*e77 rs*t p d;lr in a 110-V primary if the 24-V secondary has 1lpd7**3sv83 r7yttjr;edh hl 00 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 5003dq+mr2+qr w 1:cg;gesjd g1m -turn primary coil and a 2000-turn secondary coil. If the current in the secondary is rg2: qqs dwmjge 31cg ;md+r+13.0 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 l 0 7u+qsp6ogps95dvs .9bbf da transformer. Assuming 100% efficiency, how many amps at 24 V can fdl pq9p7 b0f9s5.ogv+sbu 6 dslow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 n/9y+jlp7qr h mA. The p +njyhlq 9r/p7rimary coil 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 ox n :-zsz3ua4ln its primary coil and 300 turns on its secondary coil. If l:4n3 a-zsz xu120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 30n6 mtu- uze(a z,. aqu-koh,j90 turns on its secondary coil. Ifa6n mu.tqj-k o,zu,z (u-eh9a 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 ngf3h7l4b vj,e y1ho/has 200 turns. If the input current at the primary is 100 A, we can expect the output current at th7f /jnv,e1 y 4bolgh3he 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 secondary has 200 turns.fpe/t i. j2ra7 ,g8cta( xp6xp If the input voltage to the primary is 100 V, we can expect the outpu 7ejrpf/,tg tx ppia(286c. axt 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 secondary has 200 turns. If yk7 jx4q0;iu vthe power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fricx;ijk7v 0yu q4tional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The *xlpgs*r 5j .tjr; y,ivoltage is usually stepped up to 4500 V by a transformer and transmit x*,lg*yt5jir ;rp js.ted 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 60iijb. b :/4p(msu917kuehfpl A of current at 120 V. The voltage is usually stepped up to 4fmbp4ji u1.ib9 ul:kpe7( hs/500 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 120 V. Thep je ha+k2,-ig. qtd+g 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 transmission la .dh+gj,tkip+g2qe -ine 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 resisg q 8y-jzgm5 r*f8jla/tance 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 *zf/m-g8qrjg jl8y5a:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. ,rzaqw9(mi1p, i:v /ukppf2q A generator produces 100 V at 70 A:r12qpim,9fiu q,k/zpv( ap w. 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 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 lindnchr,f u )lu9 o +y)e 9i7sillk6(3iee at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at+ei3) i7 ( h6lls9uo 9r,df)n clykeui 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmittb,k/f sgqjz 5/kpzmv0jj 8e3d5 vz+j6ed on a line with resi5p 8zqzf,+ 3v5jg 6j0mekjv/dbsj zk/stance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is s8h /y vw-jm4ywky a+x)d0scz ;tored in the coil's magnetiz m4; jy+hxvc-w aswk)0/8dy yc 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. Wha6jrt7x o4*bw.2j2w ,ec y cumnt is this cyx6 rt7u4njcbo2 . *e2,cww jmircuit'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 voltaq +7fmhqiphty +s8 oo;sr52 i osa/+c5ge in an AC circuit where 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 -+m + tamh d5o7tla3ft120-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 th,eeg0(zfl x-k/m 4 59b5fap vc5bvs ide resistance of the lam5cx f5kd vbm,fsba-vli(5/p4egze 09 p?

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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 pow0 am u/47vyf j ofmi7 yk-xdezjmf5/s,8wy 6l-er supply. What is the peak current through the resistoysy -ol/f4jfd vm j60f ykmux-5m, a7wz78e/ir?

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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 powerqa o-hy2hry 6/ dissipated in the resy/hq 6-y ah2oristor?

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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 resiu ,+1x :bfo q81;rupqxr3za xgstor 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 aim6d8 fp33 ui2ux aq;e 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is j*9vslk pk*qf5 jvu3)$I = 0.80 \sin (240 t)$. 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 l(gzuml(q1 ,y a,5 l ,;vmaeod60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.5r+j7s0z sdbn 1nf 65wa0-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-m *dfsffnd qqwowoh/g83hlvhi m),* ob 994u.9 H 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 nr q1 fxoiazf:96y84rat 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)-rt -hlduumj-ps +x. a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to t-jp.s)xrum-hld u -+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-:s )uxit -:h+guuc.ceV, 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 reactancen 6.+ta/ci 3 aelhr 16puvg4vv 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 reactance et)g5 h*9bcy8kv oz7-i sh*rsat 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 W?1x xa6-;f p9ahdkq;ry

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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 reacigpz h 8/imnhli0q9h /15sp c9tance of a 0.010-mF capacitor be 100 W?/1i 8hh gc5mnh9ziql/is 9pp0

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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 ca 6.li: a/eeg2clyia.vu n;b9ypacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with rqcv:0n ip6,p12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capcq0p pi,rn6: vacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.00abns z+q 0oem- n2sk8-mF capacitor skqn 0s0 nbo2em+-az8are 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 100n7y-5tf+w m 9ow:s3 /nkug cyv-W resistor, 20-mH coil, and 1.0-mF capacit3 c9 5mv:y-wtno wsnyg/uf k7+or are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in seu-z .y1qc-zdyhv5 5r7nlnv d 3ries with a 20-mH inductor, what is the impedanclynvc.z173vu qr55d hn-y dz-e at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series wirn* h)p/hi7:qe, vmom rg8e 3eth a 20-mH inductor, what is the phase eh 3e8: voq,e n rh)gmri7p/*mangle 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 cif;+z xq4b4 likcc7 /3fmycqc 5rcuit with a 20-mH coil and 1.0-mF capacitor for5q4l+ xzfkcqyc4 b7ccm3i/;f a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is neelto ,436./,2pruu gn 4bkwyn5 z :cuzdg.kwsv ded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 y s d:up4k.gbv nw.ol3cgu,2rw56z t /ku 4,nzHz?

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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 ac8gw/gs j.vlqug-*.t 450-mH inductor at 5000 Hz for a total impedance of 40000q.jug/ w g*g. tc8l-vs 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 in4io ,abvd ui+p15tg,gy d-dt+ series with a 100-kW resistor at 1.0-MHz for a total impedant- gga,5i1t yudpd++db,o 4ivce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with )l*qcf g9 nws/fsrian,qj70t ;62aws :itpk 3 a 20-mF capacitor. What is the impeda,slnk63/7sa0 sc:ffqip* w; itj ) qar9n2tgwnce 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 10-mF capacitor at 1.0 0e-dkm p6yok: .pct i lucv;.1kHz for a total impedakpy d pkum.l o0:v;tce -.6ci1nce 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-cuhj1c e7o o.(mF capacitor at 1.0 kHz for a phase angleu7 ( ooc1.cjhe 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 - *chyc.jw8mxe5js zw(u x15nseries with a 30-W resistor at 1.0 kHz for a total impedance of 45 m j5.e-uhwy c(wxsc8*nj zx15W?

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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 izd(-;8rlz5 wgo+hk mf a dihf*u9c4y2 n series with a 100-mF capacitor at 120 Hz. What is the phase 5w9frgcz*lidaud2hy + (m-84 z h;ofkangle?

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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 1x l8j*i; fs eemm9efm m55+jj500-W resistor, 20-mH coil, and 1.0-mF capacitor are coes 5ij5 fm8 +*m9;5 jmfeemjxlnnected 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, a;rogossau5m1* gq 6r ;nd a 0.350-H inductor. The circuit is co ssgg5o1* mr q6;ou;rannected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capac8k-yf 7.eqm :8zr giwp6:ipzjitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to yiq: : ewr8j.z6m8pif7pkz g-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 containi95*k0qju8c p8eya zgsql ;- ning a 50-W resistor, a 10-mF capacisei0q-k ljq ;c 58*n ygpu8az9tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W eng;d4osr v1 9w)ef.aw i 7)v xe+zh1lresistor for a phase angle of +7ew.rvnfwh )xe i;a)1ed49 gvz o1l s$40^{\circ}$ 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-mH, C = 10.0 mF. At whybuain69 ,*ew at frequency should the9 bwa niy6e,*u circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power ouklihr 1 k7h9u)1ts ho9o.0su1 te+*)tuxixxdtput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to ox ktudu)xk09hoi1rt7+) h xu .se s*1i19thla 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 circui 6q)x*jpxy8aa6in x6a3 d)rci t 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 res2g 9s*rxbf li,istance of 30 W. What is the power factorri*2 ,lfx b9gs?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-Wnf7 5b2)*ync 1snsjff xxd 53h resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne 7jx)nf2sf dysb35x*51 fn cnhcted 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 cap6*3wn:yv rmlk/ g ifo9acitor and a 15-mH coil in series?/9*w rf mlny :6gk3ivo

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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 fowa*pk*8z:dc ;*x rv uhr a resonant frequency wzc;a*p 8*k *ud:vrxh 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 seriele;lcl )up ;j1bqqr ig.2-oi0s with a 3.7-mH inductor for a resonant frequejqrpi-;2 q.cl );ubg l10oielncy 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 pqdrs qva,ppp6*e :3n+ 0 *svbelaced in series with a 30-W resistor and a 40-mH coil if the resonpp*3*qeb+ eqpss rv:6da0nv,ant frequency of the circuit is to be 1000 Hz?

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