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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 mo0 (8oyt.p4( nv vwqdc4ulm: iagnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states x) 2au80djk.dx; kaanrrqrq-1 0de;zthat 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 producplxk.x ye/:wu7dj *3wes what kind of change on the:u .3 pxwxwj/7dkyle* 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 f bx -a.y7ned c dpnrs:6t8yz+0 45lqbsield through a loop of wire produces what kind of change on the ind:+ezx-8 nsbpqd 0blsr7y5ca4.y6 tdn uced $emf$, 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 :z8 kkp w:bra,loop of wire produces what kind of change on the inducz8kra:p :bkw ,ed $emf$, 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 8:dey wv)oirt96wuy- a 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 rl ibo)y ho .:m3zjk+/direction of an induced current in a conductor will be that/+hlk) y: bojro. zi3m which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal taw8qp)a64s ad5 dtso(v57 jku tble. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inducevj5ddpq 6)8 5sua7os (k4wta ts (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet (di 8a6r+qxk iis held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abo8axid+k (ri 6qve)

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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 ;qz eaec4f2d 7the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inducedf7;ee2d aq4cz 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 9lxeze7/ / .ao3 e zflh)lj-vltable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows h. zax/-zllv7e3loe)/lj f e9stronger. 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 /)7d/ th j;eddcgc(ksjddj;2i5/q dcregion where the magnetic field points straight down. The magnetic field disappe;c/cg(dqt5e/i dj;hddc 72)j d ksdj/ars suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing ci93so r eku-7 k8j2xjynfj +vd:7u md8urrent northward. Two coils of wire lie flat on the table, one on either side +kr-s vd87jnki:9y 2uo7udjefm8j x3 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 northl yz;i)qr sn(,ypzl++ pole entering first. As the north pole enters the lyzsrlqz)+pyi (n, +; wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed a0e zco.okmtk z (7o1b6bout an axis whose direction can be varied. In a region where a uniform magnetic .c 7o6kze0 mz(1obotkfield 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 rotate qh-6) w5xmamnd at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must wamx n-qh65 )mbe 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.mfk l1rc g(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 a+m m2 s3tkg/pan $emf$ 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 maj kfhyzce;5z,7(g. mcgnetic 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 (oriei( i;:j w )q,ge:io8v)j hkau9yt2svznted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the )s:k)hiuiy;otjv j(q2zve:a g8 i w,9 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 rotatesz .ew up:77vag2 vp9vix i55uw at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transform)-i b, 1qn o;ry/ejysys

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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 1te6(st1o fo k60 revolutions each second. The frequency of thee( tsotf1ko 61 $emf$ 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 dev vwv+u/ iry8t*eh+ oq8ice 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 devdh+ +ii nep0r5ice 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 contag(.e9)1fsbvd wdf2ea ins more loops than the primary coil then it is s(.g2vdbedwaf9e f1 )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 loops than the secondary c(0 bfo c.bxjrob1huqpc6) v+/ oil th6 q+)(/ub fcopj v.b rocxbh01en it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputp3q9yx7,sq uq td).o a

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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 8 03puja9otrq zy(yk, 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 inductsntls.b x ),uxr69o4por are connected in series to an ideal battery of constant nxp. 9 u)ss4,xol6rtbterminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductogmr ;q-z;xcp2n n )o8.neb;zz r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with th;8b2cemg rnp ;z)zz nn-;xq.oe 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 -z ;(fs tmb hx*x8z4wj$emf$. 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 i3jc s;50*(vsg)xfff ;zcu we ws 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 con kw/2q zb o,he/-g0xhcstant for the circuit represents the time required for the current to reac cebxk/o/q ,hhz2wg0 -h

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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 batter6* 7+0 h mr7fyvun( qlk/iyal:p jjq*dy is suddenly removed from the circuit. The time constant for of the circuit represen77(r 0*idqfhq*nyylu +lpva6jmj / k:ts 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 exm6oi -x2z6*z1h ,ak ob0h ziajcept:

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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 a 5q7wlhe0ov qq9vft 40n AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. *q:p7zh 8ldqad kf z+; In this circuit, the curren8qhz+:kf 7dp*d; lzqat

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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 c wq.*wi. 6row+6xgjuj4 or.emircuit changes by what factor when the frequency is trxw.4 .+6q ooe m*uwjw ir.jg6ripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductiz;+va( m g knb9qno)3cve rea(;3kcvon9)b g q +nmzactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an ind;ct3 + (oklblj.s1inxuctor approaches zero, the inductive reactan1;bj( l il. o3tcsk+nxce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circui: ik(m1r ie)5lxabax :t, the currexre:)bam (lki5a1:xi nt

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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 ar8mplg hp(vy (c8,ia8n ac circuit changes by what factor when the frequency i8c8l(rmp,yp8 i( vhga s 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,x657rpna um (sf /3mgj the capacitiv6 3x(mam/57 pungfr sje 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 between the voltages of the inductor and capacitor in a*kp 0lph)c z.o RLC slh*.0kpp )ozc eries 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 cirr n570*f smh s*5rhbl oizok12cuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ou:5agvcw(3/ *vaniyqp32mhi f the circuit increases if R increases. When is this stat3 ai c:2/mhvv a53puyqwng(i*ement 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 5g1xft8jo,/5h xmrmo r8 -qnh of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit i9 )+:y wbarrddx dwab4i -da23ncreases 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 sqkm,y1 dld+:,hz42ehorrk e 2 eries circuit, the resonant frequmoy1,: rkld2d ,2r+he ze4hq kency 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 applied d-cv7ci u 3 1)dlcs4pfvoltage. 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 occu+x ftx95loeb, rs 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 r m y6dcyvxe*hmfyk08 e*x 9w.cgl*0+cotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the p y 6*l eymcgec 80.km 9cd*vfw*x0h+yxlane 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 in a uniform magnetic field ofb2 amot*1hoj l1vc3n v ,b4p:f 0.20 T. Find the magnetic flux through the loop when the plane of the locf41 jvn lh*ao13bp,m t2b:ovop 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 ofi i4y: h2-g ,6gyfi ki(3aybkm8zwy5 u 0.20 T. Find the magnetic flux thryawfyzigi ukmi8kh(y ,b yi -6354 2:gough 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 adjust/wqfdms1nxl(sx . 8t+able 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 changes frhv1rxml3 vpe5):6 wwoom $4.0 \times 10^{-5} \; Wb$ 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 frameaqf 39 m;lpr-g with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field c-r9l fa;3q pgmhanges 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 turns )yrbaqto-h lm8 a4ay), 8p+g yand 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 area :pbx+p gl) qv a.kxpyuyt0k.r28+4r8 s elmp8$0.20 \; m^{2}$ 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 flv;*0z6o b,ksp0tuvj z ies horizontally at a location where the downward componej*tvzk0 sop60 uv;,b znt 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 muv(6/zoo td);yd fsi ;1n03by p, egrh long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one eg3d; d;u(t h) y i0r6obv,s1pzoyfn /of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-rz.jq5xl t58q 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 2mckm0mh t o2)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 rectneh (a dzkj-hsbr(p-v-h7 01pangular loops on its armature. Each loop is 12 cm long and 8 k- p- (0dhhebr nvz7p-1 jash(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 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 w +syhd ccqvyim3660 d,8m,fi gire 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.zq ed- kosjn :7bh*0g generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating co.q7gk b0 d hno-esj*z:il 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 with a ma1 omx kv:lv;op +k(h c8fo5u6zximum $emf$ 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 motdjya 5ae24gkgxcmfut * 8 i.h-.vx0w9or operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opew3akv e g:r;/p qqbq;(rd4z 3hrates on 120 V ACbgaze; wp q q/hdq(:3;r4k3rv, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistancehbkb9 n/i,ff 5dj ,3be 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whaten5 ff,,ihb 9/b bjk3d 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 internalwu- ekjpu)2 *kd :lwa.-xgx hg s2as4hv-)1dw resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the badg-sv .s:xp-*w h2eja )2xd huw1)ukk-4lwgack $emf$ 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 connectevc4l( 8ygds y*3dpz;bjcd1 x1 d to a 24-V power supply. The operating current is 1.0 A at full speed. What is thec8y lzj3y(p*d; 41bxd 1gvdsc back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primarwwu9v*u ,7eb(lttc/sb,ebl a r1yg*2y 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 14 A to fl;0hj+:k ntoltow in the secondary. How 0 ktto+l;nj:h many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110ycns vaw2, 9w7fpj-5 o-V primary if the 24-V secops c5naj, 2 7wv9fwy-ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn pri heyz*pv6u v;us*l2o3nys)q abpe i0y*-e: n5mary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A,a;ueo): viy*nyevy-5us60s** p2qbz ne h3 lp 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% effici qw3vd5 frn6o3ly/9t kency, how many amps at 24 V can flow wvt/d9r5no3k6 f3ly q 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 mA. Tccgk,f2 5;s zuhe primary coil operates on 120 V. What c,sk52gcu fz ;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 primary coil and 300 turns on i7vsu5 y2bhez5ts secondary coil. be7 5v2huyz5 sIf 120 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 primar*5dyprk u04bw y coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p54uyr 0k*pwbd rimary, 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 transl1 w y/e/f+xptformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at thexytf/lep/ w1 + 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 transf/e hbc2 leglw 8j6v0icfe*q;9mh) , ahormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, wevca hl e/ 92ielm 0egh;f8*qwc)h bj,6 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 tub:z +x 7(eoct9xt8l xp 5ur4ndrns and its secondary has 200 turns. If the power input to the blx7+9 :(dzttxrounp 5 e8c4xprimary is 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 V. The voltage is usually stepjcr ely*x:( afi-1w hpt-,gv9ped 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 secondar- jr cp y*hg(fwx evt:1ial,-9y 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. The voltage is usuallc 9-5,msusskbi3w fny uq z r6c5/*2szy stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find th*b5 s5uki/qc smw-,r czfsz2uy396sne percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuallyu7xz/+j2etjyv xo 43d fz8i i1 stepped up to 4500 V by a transformer 7t ju/4 izxd81yj v23eixz+o fand transmitted through a power line of total resistance 1.0 W. Find the percentage 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 resistan*2g7da;;gj ycro5boace of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due j ao2;;yogr a*b7d5cgto heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ou; ubp6oa,gw h.hy(ma /-) qfyf 0.60 W. A generator produces 100 V at 70 A. In order to reduce e6-y(ph /yuua, f mah;bow.)gq nergy 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 line at 1000 V. Howf qfsop(y6/ 5p much less power would be lost if fy qofpps5/6( the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a genejsyfng30; tvsqq9 ro 4q:)wlrqq5 (,vrator is 440 V at 20 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 powe r9,4qny;qjv0wsq )s3tgv:orqq5lf ( r 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 cn:wi )ka+y8x -+oy cy97aifn :qqbck7 urrent of 5.0 A. How much energy is stored in the coil's magnetic fie- y:yqc n:xaw9k+f+)7bo7yniqi8 a ckld?

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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-ptc.h z8x,vmn /ohw90W resistor and an 18-H inductor. What is this circuit's time constantncvtp9w oz 8h/x,.0hm?

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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 circp6q9g f8g2 x1 jn./ nglerbol-uit 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 120-Vvh64uq2rdpcv 29n. ui2uw1 sq); hwlc 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 the lazi 2p*tktxn+f ol*ptf+:3 * cw)om+j f+my j7um*fuoclot2jxp*pzf +mw 3f+)*y+kj:t +ntm i7p?

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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 j26gyl2r,rku m zb(0l ku((a gto a 120-V ac power supply. What is the peak current through the 2u l6k(j(rgzym ,b2kr0(ag ulresistor?

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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 powero 7dz h3 npm*8fjnx/t4 supply. What is the power dissipated in the renh*j8f t4znom7 x3/ dpsistor?

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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 resisaom p2+aw8f6 u wqdf79tor 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 abyg6t4wua. 0i dc* 8lg 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 8orn *i2c4gmg 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 qa6n/,tx)m;emd u jc: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 2.50-mH coil at7ae;rhcr fjo.*y3 (tg 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH y7a 6uv-frhe;7x6 a qucoil 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 induc8 66so+ f rajs(wg;xp(w 8cdu xvs-p4btive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencyfm ;qyh9*. fmz of 20 kHz is applied tfhzm;* q9m .fyo it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60/ -7z+n ourmyr.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 m 5wgk vk 0/- xadd0.uu)h(o2n yhcmk1capacitor 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 at 1 8re0r/g ivunelf ,:(e)bq8-.t ln*d 4ang gfz0 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 120* 58bn4ptz ww74drpbgs4r0se0 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 0y)0p wdljb8 2u.010-mF capacitor be 100 W?8lbj20d wuy)p

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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 capacitoc7a8:w 5hg)bga+dz kur 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 ci(2 b6+6vcsh6 w:nb ee0eaq nscrcuit with 12.0 W resistance, 15.0 W inductiv s2 6(cbv w:0bqs66c+heena nee reactance, 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 vpi j,advt;ph0f7o4w;n r. 0aHz if a 100-W resistor, 20-mH coil, and 1.0-mF ca;ti. f7dv0aopvrp ,0 nwj4 ah;pacitor 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 ineh / br vrxe*7(f(i9vb( c8chf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte*c vxh7ve8((nhcfer/ bb9 ir(d in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the u+mf7 2emrnlfq85d q8ulg92dimped q+2f87q5 f9l2muln 8drdm eugance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a y*wf 13z34+jn)lhckmedz*yx 20-mH inductor, what is the phase angl*x 3jc+zzywe*)nh1 kmy3fl4de 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-mF3rykv2jg z a1k/bbl*(mw)- jr capacimw(*lbgy1 ar2) kzv rj -/3bkjtor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in serh 9c v )6g8wq*2tnpoceies with a 100-W resistor and 15-mH coil to get a total impedancewge n)9votqc*pc62 8h of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz :4ee2- s;x ny fzc+kycfor a total impedance of 40000 Wn+ :e;cyc 2sz-kye4fx?

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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-MHz for a to 6skg+ zk9:v p/2aidudtal impedance ofkasdz26ud k9:g/i+p v 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 20-mF capacitor. p12*dksb3dd)d iv,vyk*+oq e wjn82d What is the impedabds), v 2d3id*nykwk+dje*oq2 vd1 8pnce 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 gpq umo0e:3w9yz(bo+ 10-mF capacitor at 1.0 kHz for a total impedance of 45 e +oz:uoq90bw(mgy 3pW?

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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 capaci.sz c:hf4bpq j,0cv6itor at 1.0 kHz for a phase angz4,cibc h: 6js .pfq0vle 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-Wqe3k* dq u0az57e1 oos resistor at 1.0 kHz for a total impedance of 45 We 0uaqe*soo 1d5q 3k7z?

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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-mFkfw :;csa:qn 8f8d(rk9wrp 1 a capacitor at 120 Hz. What is the phass(: rcfkk18:rwa9wdp; qfn8 ae angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor,:sj6hz6 ec 2ec 20-mH coil, and 1.0-mF capacitor are connected in se2 hec6e:zj6sc ries?

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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 resistorfvo/3. 6y/zzql* si8tx e 3aql. gmcb/, a 10.0-mF capacitor, and a 0.350-H inducto 6/ l sx.3zt/.vyq8/iq3e *fbazgc molr. The circuit is connected 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 capacitor of capacitive reactancemn)m,x*,qa/90xy ozr8efads e7edt8 30 W, and an inductor of inductive reactance 30 W amz ,q m7,toe n9)*aar/ex fxde0s8y 8dre 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 RL2 w:1u+/xp3ct lqtc dsC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60xdcwls 21:+ctu pt3/q -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 seriewrbv,+ :w/n iws with a 500-W resistor for a phase angle of ,:w+vww/ rb ni$40^{\circ}$ 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 = )nc3 brmh3/aq200-mH, C = 10.0 mF. At what frequency should the circuit brq3mh b a3nc/)e 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 output in an ac series circuit with 12.0 W resistancerf*k-w dg h 7.o5vp;az;qk 9dr, 15.0 W induck;r wao- f 7;9hdq*vdzk p5rg.tive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitdps ag lg l; y8o26s:*3fin2pq 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 imp 7ubg3(xg-dube4 fd/amj -x9/2i hk fmedance of 60 W and a resistance of 30 W. What is the powe dm9/ug xd /eh-kb(ub g-jafmx2if3 74r 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 circuit containing a 50-W resistor, a ab4;e-k5nn igwc)(14od z fba 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup eiac afg-n 4 bz4k;1bnw5(o)dply?

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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 b2 6usxn d)3y )nxdpjm; o yoq8(o*vt:and a 15-mH coil in series?(px6j))m2 n; 8tu odqb3ovyxo*dys :n

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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 cev;z- a3ppr-if,k rn 8apacitor for a resonant frequency of 10 a ri8ezn,;rp3v -kp-f kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fr , 3huwnfl4isx u4j,+3( rp;czkbl,dsequeu dx,+44f(z;i,sk3 hj3bulp,c nls wrncy 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 30-W resistor and fy 4wdeyn qnk d86o4-6a 40-mH coiwy6eddonn- qf4 4yk68 l if the resonant frequency of the circuit is to be 1000 Hz?

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