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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 xj(m24hi.fu xpu ttk,6vp f4 /of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states. csc *feviil/2//ubl 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 lo.7wc-t znlscs(b+ 3 on8fr qo:ops of wire in a coil produces what kind of change on thsnlfqbnco-3st 7 8 o+w(r.z: ce 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 fie*pd0 xpohxhn ; *20gmw)qtjte 8(t4lald through a loop of wire produces what kind of change ona 82t0*m4p hwlgtt*h eqdnp (0;ojx)x 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 what kind of change ou5t 4yg0r hnjx evjc0(./ww2m n the indu m y0g.x5eunv0tj2wc w r/j4(hced $emf$, 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 removedyrulyger q jz:* -74 l)q/+ulh from 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, thhucmua0v f603, hjmp2 e direction of an induced current in a conductor will be that which tends to produce which of the following e60u0jmavh,hu m2c p f3ffects?

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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 ma5yjhnt;mt9i xf1 j i*)gnet is held above its center with its north pole pointing down. The staym 5 t *fi)itnj1hxj9;tionary 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 table. Ain*i9n:;xe 5ydn, i he bar magnet is held above its center with its north pole pointing down, and releas,xiy dh i9ne;*ne:in5ed. As it approaches 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 magnetcpp7nd 5pqf +9ic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced cfd9 pppq7+5 cnurrent 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 levelf*g( kn3 i68a,o3 +yhzrme m.gj)ic:a;ivys a table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction eyk3i jyg)c(v3ni 8ai,g af + h6oz.s mm*ra:;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 tab7s*l q js6 xm(kubf/3brcru74le top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. rs3bqu/kxs(l m7j6u fc *7r4b 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-ind7 67g(ue1 km*mknusa creasing current northward. Two coils of wire lie flat on th7a6e1km ksunmg 7u(d*e 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 thl v)w*x,4q +iz cb1rmxtw add:(dh- 9grough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fmxhz :* bdi 4lvdrw)1 awq9t-+x( dcg,rom 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 h-t4;wma xea4(fu4v qconstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rox- 4we;tqm4a (v4ahuftation 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 rotdlt 2gf6: 7ka zk,ulj(ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magn:j7,uta(k lkfzg2 d6l etic 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.q(;h,(mj;jrxgu hl q;
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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 4iaj(f .6xgk;8 dxnag 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 mag(558kzpm ffav 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 at ci rux0.;/i fxhonstant velocity through a magnetic field that points straight down. Make a statement concerning the poterh0i/uf; x.xintial 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 at a constant angular velocip/ fqf.+q ekt* vm1t;uty $\omega$ 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 tranr/xykp -+k ncp 2*.jgzsforms

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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 bg r 5jy3hg2s0tof48athrough 60 revolutions each second. The frequency of the 3hb8ja 4g5o2y r tsf0g$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used td j)x(oh0-sk b(0wz goo

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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 tossji; pox+z677x .kahat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primarw;c -ajnhfxyz *2 i9psh7bsx:r+d-4t y coil thc pw 2h-dx y4rf*s:abnti-jzs+h; 7 x9en 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 loops than the seconda zvlxr (3r.e;nvk*p0 (-ltz uery coil then it is ul l0zzv.;erp v3rtkxen(* -( 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 pg8w sj tr81ol( ujcw7tvsce3voat(2x m-81e8 ower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant clr5vyfd 1g (f(r0trzy*s5ja 1ircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of 4v 0(ijbh+byeconstant terminal voltage. At the moment contact is made with the battery, the yj4 e+vi(bbh0voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of co8m+j q ;eyy 0btut6f5enstant terminal voltage. At the moment contact is made with the batter6jb eqtumy; t058yf +ey, 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 h.1lj-yu dif8 $emf$. 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 resistancmv8worexp eg/, *,i:de R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to bj37c vo8 fays+ ;oo6ga battery. The time constant for the circuit represents the time required for the current to j ;6o 3ogv y8acsb+fo7reach

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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 co(3 x8xlf1-,jte0btu1a 6uns/ 7 tbi muilw;kznnected in series to a battery. The battery is suddenly removed from the circuit. The time constan1a 1u/ t(, fi-7bmjslb8k6ultuw z xx0niet3 ;t 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.m-d rpzgsr n-b s48/k:s)m jvt:

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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 circuibg hau88f j(r0ege1 9at, 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 AC5( /xg*qra qifc)s, zg;rnf5 p power supply. In this circuit, the currentf(5,cqr *f5/ r; aqn)zxg gsip

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what c7erz+l 0 5gne,dd6lv factor when the frequency is tripled?+ d7d5l0, ecv 6zngler

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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 doubld d5nj3dj2db1 ed, the inductive reactance of thd51 32bd jdjdnat 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 thes ek b0+) zclh(;.lwmc AC voltage across an inductor approaches zero, the inductive 0kmes bh(; +.w cl)zclreactance 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 toe3*nfj hs( 5rn an AC power supply. In this circuit, the currejenh sf 5r(3n*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 an ac circuit chaw zsos47jwy5 .3ifsa6nges by what factor when the frequency is tripledz 4jwai 3fwo.5y7s6 ss?

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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 capawr og u.) 4c6vtcqn8v:citor approaches zero, the capacitive reactance of that capacito8)t ur c.vwocg v4:nq6r

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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 they,da tphd2iu q/i+s8 ; inductor and capacitor in a RLC series circuipt a/i;siqyd u+,2h8dt?

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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 defined a2ze/6/00xira xcbe3 fq7d ifis $\cos M = R/Z$, 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 imp3pf qpcfp)s: 9edance of the circuit increases if R increases. When is this statsppp3):q fc9f 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 of the circcu llz38 1, bfmkdj axvrbi2p) *p3(rj5hd08juit 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 cir hk0nk/+zb6kf9n.l.xg ve(6q ouz uh6cuit 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 bv8xum a0 6efncc v2n ;+31flhboth double in an LRC series circuit, the rx cn c382v1muh ael +bn0ffv6;esonant frequency 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/t:d 8ycx dwc-,x1jte 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 o5 z(w5atj:rt RLC circuit 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 radiudc9iaza y;3/jhtm x:-s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane - :3 jy;9a/ zxdciamhtof 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 zfxl lmz nsp2i ;u0/n49om*y8uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of tl imxp /o* z8nfsn42ylz m9;u0he 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 0.10n r;(wenm4d a(lph97s m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vnh(rn (das9 w7p; lem4ector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced from vvxh8:3b9 )s6u9oavwbp : e/gy,l vwh $1.0 \; m^{2}$ 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 ff+ c,zso*ueng/:l) en rom $4.0 \times 10^{-5} \; Wb$ 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 sides 18 cm. A be;rvd 9dl)n-*vvl ny ;q*o )huniform magnetic field is applied 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 h*yvol ;*q -n rvdnl);)ebvd9 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 turnsuf2i 8 t4yce3z0wmb +z 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 qd/rpxlx llqb 0 ih37,zu:4s*xm 0g5mand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally s8n5 y;7kvj 4 2ieh 6hpl*ye:ycs)ossat a location where the dos4l 8h; ejo yiykess*s y 72:v5n)6phcwnward 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 lo ttw+pxt30:lw ng rotates at a constant angular velocity of 2.0 rad/s about +pt0x: wttw 3la vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of mxq1 8.m 1obldzxwe0 6k,8qk g$0.25 \; m^{2}$. 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 tur5fvres2:a 7,in (1w yy:fkampns 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 lotgfmpb44 ,5 k9z0vo ysops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotav45 tyzp,bm0s fk 49gotes 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 wire of are41nql 3xba3 9 yum.ujilj7zr- nao;w9a $0.090 \; m^{2}$ 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 t1:i6lx)xnj co o construct a simple AC generator with an output of 12 V maximum when rjn6:io) xxc1 lotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator 0nz/)8 qs1ki7vdnga;xk iw-c 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 vuu;s3ean e,z)( +lmsazy5 vtu/o93b motor 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 have a resistance of 6.00 W. The motor 6d8x;u)cnn xaoperates on 120 V Ac);dx8ux n6a nC, 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 resis-2wuiug e. qwhmwn4- oz: i12btance 6.0 W is connected to a 24-V power supply. The operatingq2u-4g imezh:bw ou1w-.nwi 2 current is 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 resistanc/5drm ( lja((s+empxue 6.0 W is connected to a 24-V power supply. The operating current is pl ma+ud(rm j /(e(sx51.0 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 resistance 6.0 W is connected to a 24-V power supp ab(d.-6splgb ly. The op6pls- ag( .bdberating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed9 ppy)6nfxlnljy2 06r to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tdof;:k g wo6fc0mq m8qwo 3-3wransformer causes 14 A to flow in the secondary. How many turns are in-3wgq;qo8mk owf3c 0f6ow:dm 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 n )k20rckqigj lnfo+/p w 8*;w6apg:jmany turns are necessary in a 110-V primary if the 24-V secondaorn j gwcif;jk+ /kpn*ap):6g02l8qwry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondaysz 3;hv c7-rzn7ue/kry coil. If the current in the secondary is 3.0 A, what is the current in the primary?ny 3r7cvus-;zh/e k7z

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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% efficii/ j(lutv/9ov 22b xlln7pb.yency, how many amps at 24 V can flow in the secondary/ tbuv .p b/97xvoj il(ly2n2l?

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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 kxuhuc iu v g)9i0un198c+dz0 neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What d8gh9i 0vuk+n x ucud)z1c9u0ioes 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 5qr-d q2qp3d (8ceok q :bxdaa2u0/jf has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary5d- :padaj32qdeq2ob(xqu/0f q8k rc ?

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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 primahin1ru .mobq c *d*/z:ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?*c u 1d: /m.qonr*hzib

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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 2qc ifl n tv h)8d;+b:1pzctn(8v*bbzturns and its secondary has 200 turns. If the input curren:b2hb8 tc;bz)1nz8 +pnct qv*i(vlf d t at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and o4dh 8cv +lij2g/ f:kcits secondary has 200 turns. If the input voltagohkc+g8vj4df 2il: /ce to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnsce 7q5f4xu x d)b5;htn and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictqf4 d; 5hxuxbc7nt)e 5ional 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 step6 ;8a4rniqf0u k6a wmjped up;f ku4j0q8nwai6 m6ar 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 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 602rv x3jw9h5kg A of current at 120 V. The voltage is usually stepped up to 4500 V by v2h95wk3xrjg 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 (yjuw s/; 8az p4zfr-rp-g8pm 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through yg azpums 4jrrf -p (8-8wp/;za 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 resistance of 0.60 W. A )z e)6zk5uv8w8yy zlbwes/) ,ibln1xgenerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tranz6) z)v)/il xe,lkn yyus8e8wb w1z5bsmission 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 5hib: d8r; gh+n0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmiigh 8:n r+;hbdssion 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 lineo d1.d8qpo6sex/m ; gx at 1000 V. How much less power would be lost if the power werexgmq ;6ospe1dd8o./x transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It iso,u5 ddsoh4myz ho 4+7 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 power loss in transmission is umyo5 o47odd4hzsh, + 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 os6 kptb1f:6ui f 5.0 A. How much energy is stored in the coil's magnetic field? bkf :s16pti6u

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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-:tiqidi -j6jn;: 9:om/auez a H inductor. What is this ci o/aij :: nm 9;tiu:-zai6jeqdrcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circ aqvf;8o0ic 7guit 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-V AC outlet. What is the peak current yk 4iuwvnqxpf d:ey(3(2k lgr e-9nlk7o4+x ,?

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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 thes-o g q1l;e:kojs:7c*ts,n r7teh q1b resistance of the lam,nerk*l ; :- ottqg:7s co1qb1 ssej7hp?

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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 connectedeq dcl3i tdmq2 zw)(sb7u(x2 1 to a 120-V ac power supply. What is the peak curre7xqbi(qsw dc2()eutzl 23m 1dnt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the ponw+ m2 -h9udtnwer dissipated innwtmh+d- un92 the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a j dhjg/3x shl q1).;qmtc.nv: 50-W resistor 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 a 5rc*1 6 e.f1k cyk8s/yqeuc/sc 0-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 resfoo 9wz1w+/qzistor 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 ind1hff5fk k/qxgj ufl/bpn-1(fmtv(zd0 1- ;at uctor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reac q:mfj9skfgc 7g+( +wrtance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive rea vu5q,fwnwh*s1- ie9xwgs :n2ctance?

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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 at 100dw 0c688ukdzc;iy h5p0 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 (-b pjzmy33 gtg ,wga46e4 qkeinductor when 120 V AC at a frequency of 20 kHz is applied to iyt6pkjw3 (-m 3geg,q4 b ea4gzt?

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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 coila ;h;a+qn0,2qvn65tzgigl xyekw e-. 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 4x/.p 9 wnrq4 2an4i v2jh(eama.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 hbl3z vq- h/n)have 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 capacitpuf,gy gb bj85k3v -.gsh95an or 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 0o vv0 zgi4/yz9dkq p:/.010-mF capacitor be 100 Wv:k40qz/d go/p viy9z?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 10001+r wzor,c ch5 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 rzo 0,fu)d -mgof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactand)r0zou,- mfgce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W re+uiq.5 pe5jqzoe bp9;sistor, 20-mH coil, and 1.0-mF capacitor are connected in;u5b +qji95e qp.zope 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 0 /hfmuqemf311.0-mF capacitor are conn3/qh1u e0f fmmected 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 connectx f l:,xfv8 *,b4afk fk)pur*ted in series with a 20-mH inductor, what is the impedance at 1000 Hzx vffrap*k4 l,) ,u:x8 bkfft*?

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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 connectd xhkc6w3-+ cled in series with a 20-mH inductor, what is the phaslckw-3d+6 cxh e angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capaj j:pf .23li95js0juclbuv cl/wny iu, (f j25citor for a total jj u0uv5,/5pi jfn.c2 9(jl3bicf: wll su2jyimpedance 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 capau,jksct + ) nz* bx c2l(st.sbac782hgcitances is needed in series with a 100-W resistor and 15-mH coil to ge22 sc)g78 *u,h.tb skcxna+(lstbjzct a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mHftm qr-2b ,w- bsj0,fw inductor at 5000 Hz for a total impedance of 40000 ,fw-swr bj0q -2,bmtf W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series wb zdjtdkr.p4 **lt- 97hjqm. vith a 100-kW resistor at 1.0-MHz for a tota7rkbddj**.qzt9h t-m j. l4vpl impedance 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 connec6hx5dw 2 ,muukted in series with a 20-mF capacitor. What is the impedance at 100dwh,xm52k 6uu0 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 capaci; r ikmsv4xfjjd)(5/ ator at 1.0 kHz for a total impedanc;5rk (i/j4damjsx)v fe 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 cnz2 v, mgtxzo) c2l0o.apacitor at 1.0 kHz for a phase angle of ng, 2ozlx)zov m0c .t2$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needess +cw6gqe6t .d in series with a 30-W resistor at 1.0 kHz for a total impedancq6c +t6. esgwse of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at +ehqfv d2rjzfrz6m5v0e. 2 s;120 Hz. What is the phase ang f fdqerh 2s50zvrz 62;mvje.+le?

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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 iftn6l+fu 5,a4bwr 7mmf a 100-W resistor, 20-mH coil, and 1.0-mF capacl7 fmw6f+atr5b4n,u m itor 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, a 10.0-mF capacitor, and 2e:6 y :zrm sueq8oj+fa 0.350-H inductor. The circuit is connected to a 120-V, 60mqr2 ofy6e 8:: sejz+u-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 capaci yswnr*)z zlp2;s+ qv:tor of capacitive reactance 30 W, and an inductor of in2 qwz;lzrn vysp*s) +:ductive 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 circug7t j7p9e uis6it containing a 50-W resistor, a 10-mF capacitor7ui 7sjpe9tg6 , 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 resiza oq-u44 /5ycfo7oodstor for a phase angle o4 5zyoqouc7/d oof4 -af $40^{\circ}$ 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 = 203ev n 0c(x r2tluammjd05s 8q9.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to j89x0(tamd5ln s20r veq3mcuhave 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 ouv)k9 7eq;jrfhtput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance,eqj97f hv;kr ) 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 cirn3o3 zcl63 ueycuit 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 impg1jo5rm( 56n m9 ab9qk8yf vgpedance of 60 W and a resistance of 30 W. What is the power fa(6na5 m 95goyrj1bvgqkm 8pf 9ctor?

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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 f bqupk p/z/j;lb),e. hbo+en )7rz4f1qsnq r 8or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne + b7p8lnueqe,sbr;qf1h )b4/o)rjkp /nq .z zcted 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 o17r5e*cwzwhvp thvhrfn6 * /.f a 1.0-mF capacitor and a 15-mH coil in series?v7thv.zpww 6f**n /hrh cr1e 5

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a1 ydezwo2ah+; resonant frequency ;wezay 1oh+d2 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 neeo/hp 9skv;; ggtc,dhwe0+o *fded in series with a 3.7-mH inductor for a resonant frequency of de0* + g,9h;stpock/wfgv; o h1000 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 seey:,imp:ep;id oersd*vq *,6ries with a 30-W resistor and a 40-mH coil if the resonant frequencypeodmipqv: 6 *ys, *;r e,:edi of the circuit is to be 1000 Hz?

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