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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 3wvu:nl8y9 yjof 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 that +)dor-fuuw* pthe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of cha4l;5u ibz fai;qro/ b(*5xr04y d.rx:vot eddnge on txudo5 :5ab ;xd0;rdi/.bloy4 i fr(rtz* v4 qehe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field througr4r) xb uvmd-b /hdvjl8/; /vyh a loop of wire produces what kind of change on hj)4r-/lvuyv8 d mvdbb/;rx/ 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 wil4mna9c: ks ct1(o.6i (zmhj 5w,hckrre produces what kind of change on the induc4 h,k9:mn ijsrlth a5ok(c(1c c mw.6zed $emf$, 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 magnet; )kr-ghl8ct j3:a(jf3ehqohb 9c/ kxic 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 ambahw9cws cph y*) +p(;c f+8wn induced current in a conductor will be that which tends to produce which of the fow 8ph) fpc+ cm;bwhc9+*s a(ywllowing 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 hobhw 4i))*+hce .ucy*qep3xq orizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed freyq43 c e*b )x*w) h.uqciho+pom 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 is helfvfb tqr* - 8r+.niy7qd above itsb-8qqtvirr7y. fn+* f center with its north pole pointing down, and released. 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 magnetic field vector g02c tatmypzx8qk8f59h ;92 a 5cmxunpoints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil ayfg85pnc2; mx9tq8z u5m xht2k aca90 s the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region whjx7 -noj bkw,:ere the magnetic field vector points straight up. The magnetic field s jw,o kjbx:7-nuddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a re,u9e fkb7 ci1o8 zo mah7sr1)e*8f hbmgion where the magnetic field points straight down. The magnetic fielakhz,fs7m hurc b1ee* 9871mbf)8ioo d disappears 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 carrrk55t5cw, rvutxq)o )ies an ever-increasing current northward. Two coils )5 )cv ,wrt rqtxo5uk5of 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 througclx oq9,h1hcb1l)/f jc jf lka20c5* zh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abov *901qch b ffjlazx cj 5,l2lc)koh/c1e)

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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 speet/8pm cm.7ds.. ) jbf+ ncitmjd about an axis whose direction can be varied. In a region where a uniform magnetic fiecm. fi+7tjcsmp t n.8j/)d.m bld 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 coz dv/dgj33hq+ nstant angular speed about an axis whose direction can be varied.qjz+ dg/3hd 3v In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.n5kg3 sv y32v(wdmas5
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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 tb j-6t)klzf( that 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 magnetic field. qr6eo8*hw sin0 8a.re 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 mov;r ,(k,drg pd-ta olc1ed northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential ind(, acr-rgldpt kdo1;,uced 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 cxv qnfjj/ f -58 tuucg7:ge8,eonstant 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 transfom67o3ccq q *svrms

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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 bckhsp6g :.e1*v.o lk 60 revolutions each second. The frequency of thesklk . 6 g:vhbcepo*1. $emf$ 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 592 bcawxacb9ice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thato 1du8r4litkwgbq,35n*(sn f

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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 loorw s e3k(iq0,ujy1 jx+ps than the primary coil then it is x3s( ,+0ei1 wjkuyjqr 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 theo( 5s(fxxi my95dt. te primary coil contains more loops than the secondary coil thexd 9i(5st o. yetx(m5fn 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 powe 7t:um11g8evjf kvs. jr 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 cird93/r+.rbd b1n / ,1n90qlptfr4f i wcamvlwgcuit,

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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 connecj3f q0a7 x2v3y2ge/ wzsd*1lse9w e qwted in series to an ideal battery of constant terminal voltage. At 3jyfa qee1w7sg*l2w/3qs2dx9 w 0 zvethe 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 inductor are connected in series to an ideal batt*bwx,zq -h:y)9 oruqbj2 (rubery of constant terminal voltage. At the moment contact is made with the batterybq u ub*ro,rh:xwb)yz-29jq( , 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 wig0q. ohn3ck)m m;v gl/th inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 jc x +u.nvzqv.uix;f69 - f0i7y.grcr 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 afx; t+jd **ecxe a,kx9 battery. The time constant fx cx*dj;ea9ke ,t x+*for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connec*bphvhyt8/ sdw7,dr9*gl1t ( vr1yxi ted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents r8sx 9hl prv b*v i*(dtytdg,1 /wy71hthe 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 h/n4up:zir:x u5ohl-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 th1jdw nn) nk -5n84p3hjj fmu5his 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. In thit;m )sfzk 2yr,bbe/ mz07lo85,v cvtu s circuit, the curren5;b0zr et,b,fc)s7y2/u8vmlvkzm ott

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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 cirf5v 8f w/1b2im.lkxkecuit changes by what factor when the frequency 2 8kx.iklf5 e/mvb1fw is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the l)8ifo-l f boe)7py6.rmm0y tAC voltage across an inductor is doubled, the inductive reactance of that inducto)8m)l7re b-l my.0t yfof6i por

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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 anusty hy;j rfx84b:8y . inductor approaches zero, the inductive reactance of thatuj:8ybx.fryt;sy8 4 h 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 circuitir0d2 mypj;w8 , the currentir2 0 pmd8ywj;

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by w7fa vvr- 1o5llhat factor when the frequency is triplel7fl5ar-ovv1 d?

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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 vb 0-ef( oj+v/zi*uh ldmy-o qw:fu,h0 oltage across a capacitor approaches zero, the capacitive reactance of thau-o (j- quz0bh*hd :wfi/0fv+lo,ymet 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 tqzw isor.y*xlv4m0*z- *sqr3he inductor and capacitor in a RLC series i.owrl*ys3x v*m* z q-4rs0qz circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit isf+uf rdl +7r,wrcu cds c5/n45 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 impedancuob sy5x3se8p3;cvg l a 1t:c9 db6yh0e of the circuit increases if R increases. When is this sta u9c y5:dp ;1boxheby c3la3g06t sv8stement 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 circuit increasesqng0zj jp3bw a9m 6p/8 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 increase(0bn91a4shbi 1x-vva t6 v8 yj flt6sjs 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 anyy zdt quyk3 ucout s7zm)0ki)1972- p LRC series circuit, the resotk2d17i)u ok t suy9)mz3uycq 7pzy0-nant 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 ak8 5zkzgqm2xs 4segel2z/o6 3p1i4bk n AC applied 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 RLCj5d;vwa1 w32ake9epd9ju8ao 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 rabbct * du24s*3ltu kd-dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux thr3 -dcb4utuls* bkd*2 tough the loop when the 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 in a uniform magnetic rws i , h;+uxs2gd7y;efield of 0.20 T. Find the magnetic flus;w hrx e7;du+ ,gi2syx through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnezccbko/;ci-f )i dmn1v oz,9/x/f g4 vtic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andmzbv/fkg,i 4 /);o-i/xcdc 1cnfo9zv the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable s9 etk.ej1w29 mew -au:7qhpxcingle 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 changlb, mee*+ q2ipes 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 2auh00;bpu8 bh 00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0bu0hu;ph b 0a8.50 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 turnrs1y(ib 5 opk(po8ufogkb za-bd/:1 8s 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 area4weu wrp n,osv*e 54bo6x)a s* $0.20 \; m^{2}$ 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 s 41sizv :(jl(6az-+fqizdvk dpan of 60 m flies horizontally at a location where the do v i-ki j(ds f4a+z6v(1zdlq:zwnward 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 a constant angular veloci;s i(sl- mtjmxc 6qj54ty of 2.0 rad/s abocm-5tl6 sqsi;jmj4 x( ut a 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 lokr (4n pgri1g-9 -ll0zosfx g2ops 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 consists of 100 turns of wire 3; kjn9rs78sy90n kmoczrx z5of 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 itsi6zmv5l s5ww os3rv **6 ofm9o armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the lo*fs5m*lvor ov 596 oz imsw63wop 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 cons-15tjfbx 5 syhists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator wi cfkt y40pu; ym8e+( 4m)pbjzoth an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is au;kjc tb)f m0e( zm48ppyo+4yvailable. 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 witwb:h*z2j nptwaf gjw7:/ 4ik-h 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 DCs py p 4qkpy0+a*79gwd 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 motoe uy cbc+6 *ab03nn:q9 t,kwxar have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full ake6 9cc,wnub0n *at+:by xq3 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-grv58bvxq76z 6xd1f,p1c ww oV power supply. The operating current is 1.0 A. What is the stac pqx1vrx5w6fg16z bwdo 78v ,rt-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powerr78 f02p*qorbav4 w03hik tqa supply. The operating current is 1.0 A at full vi*p37 rat4hbf20 qr0q ko a8wspeed. 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 supply. n *s -c02d5zwebffz jfg8 .5wy tanu,a5p7nf 6 The ope s76*f.n je2wpyazdcbwn8ua5tgf 5n-,zf 5f0rating 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 needed to reduce a primary voltage of qf:c( 0;pg70d ejt2d bhpxt2c $120 \; V$ 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 flow 5,9zty u)j ake6+stco in the secondau,c5a) s+ 9 ozt6teykjry. 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 necessary in a 110-V primary if the mnmpxcf40* f, *rz +e r(watsw75qup,24-V secondary has 100 tup,q4c07 nfmtu wxr5p samw+re( z*f,*rns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists -e .exrg6ck9 qof a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primae qxeg-9 6.rkcry?

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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. Assumingml8 )upshd 7lr zr:. l9rhr:0r 100% efficiency, how many amps at 24 0l:h8r pr r)rz.mr slu9h 7dl:V can flow 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. The pngn-e39fqmaj4o 3+fu g-4n ue9fqm3 fa+onj3rimary 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 on its primary coil and 300 turns on (k 5ghj fve*+golyogeql8:*8its secondary coil. If 120 V at 2.0 A is ap(*+l*gjglkgf 8eo5yoqh 8e:v plied 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 300 turns on itho fbt9t+)6b qs secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondaq6)of9 bt +bhtry?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. zkg75)a nn hy ;,9zqox5 2qtyaIf the input current at the primary is 100 A, we can expect th,z9qz2h y tgn)7xny; o5aa5kq e 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 turnq. jku/wfj-v3kvl *v2i9ru d(s and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be2i-rjf93v. kuv/(qkv* w udl j

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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 hasu.nufs9dpkk:sh 1,.0v 7 omqx 100 turns and its secondary has 200 turns. If the power input to the primary is 100 qks hnk. 1x:0m9o.v,pdf7 suuW, 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 uxda-6z efcs *4kr5gr( sually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. kfc4r-zgr sx*(6d e5 a Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is ushpme.v4d a wcey-g)y c91:cu ;ually stepped up to 4500 V by a transformer and transmitted through a power line of total re y49; :wmc.pd hgc)1yuc-eva esistance 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 produceshui f74gmo4uja (b v7. 60 A of current at 120 V. The voltage is usually stepped up to 4uja4hfumv74(. gio7 b 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 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 hq+q8 ( n3r9uy 4/2l hfzmug(et)wghe bas a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reducmh(lhf8gb z+nt3u4q9u /r (gw2 e) yqee 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 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 loc md/j 0b+e0eu-n0-y koy7e0z4fu jtong has a total resistance of 0.60 W. A generator produces 100 V at 7 0/4zucnuo7 0 yjobe-0j+k f-e y0medt0 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would -,)dt r4hs8 v:lalk kwbe lr)lhwkdla 4sk- vt8,:ost if 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 generator is 440 V at 20 A. It is to be transmitted on au wv ;tb)yc3a6i o.6fa line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the3;u 6)ctaoa. yi 6wbvf 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. 8 k6y;jwjrx 5to)otj xxe11o) How much energy is stored in the coil's magt1w )k;tx615 8 xjooejrxyoj)netic 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 inducto no.: a0-t n:qacys-os 1dia.zb- d6wer. What is this circuiwa.sa -a s0o-eio 61 n:.:-cdtynzqdbt'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 circuiqoq9.feqh 60 lt 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 peaqzn 0jl nfl 3ft+r(.s)k 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 i vsnsj3 f4qx z6t/ c+f*9yu tgsp:so++nto a 120-V AC outlet. What is the resistance of the lamj+qss 93notyg+ c/*:zpsxs6vu4 ff t+ 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 power supply. What is the -w yat-.ahht* wjizhgs) l3.7 peak current through the re*t) h-j3 lia-7tshg.a.w wy hzsistor?

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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 cn pzphj y+ugv(c02r)4onnected to a 120-V ac power supply. What is the power dissipated in the rejvuynp+z (4g)0h rc2psistor?

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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 r+c+no0ht2dx eq- f i6resistor 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 50-W resistor is 6+m0zezm d9wp $I = 0.80 \sin (240 t)$. 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 50b48bl opq 5,si(dk ky;-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*0 o o7x-dv pmmx6lr(p 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 w+qeqbhw6, 4c reactance 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 os efkdraz0 :.6f 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 159guya , *rbh3,2u79iasnohomyq1 frh5 f a1v87 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencyv-+sm(0w y*i r)a b:vdjii s:p of 20 kHz is appl i(mv da*y j-+bpr)swvs :i0i:ied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current throup )dc4dtyyjw bbe2v, ;d:2m,wgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF c)1or. l. xqfyxbc+ 2ipapacitor 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 ha2obr 0 *hco1jueipiz );;a 6guve 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 capacitor have a red glf+ n,j0q8wactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100,ed3/ef kmit+7nvrw4 W?f,r3dit +k/ 4emenw7v

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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-mFfgo5(rzd y *:t capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac serie90hi 7cnhybm:7 0unx ns circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0ib hnn9mx7h7cu: y00n 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 au74d1 u de*go 0* e8ucsqb+vswt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser dse w1+ 8gq*c*suoe7vb u0ud4ies?

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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-mHc/,2qk6uo x bd coil, and 1.0-mF capacitor are connec u ,q6obxd2c/kted 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 s (f76(p yg:wut4sgy wteries with a 20-mH inductor, what is the impedance at 1000 Hz tw 6(ytsygf7pw(u:4g?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, db 60t9b riqy9what is the phase angletb099 rbdyqi6 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 k3h1g u6ac;n;s 1ivyfcoil and 1.0-mF capacitor for a total impeda;g31hu iy k6;snv 1fcance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistorpn;/k(t7 lypfjn2 z- p and 15-mH coil to get a total impedancef 7-nt j pklz(ypnp2;/ 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 8 l3;wt k7hkdh450-mH inductor at 5000 Hz for a total impedance of 40000d7; k3 wlhk8th 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 qo: iy; 53jgldput in series with a 100-kW resistor at 1.0-MHz for a total imdoi: ;5jql3gy pedance 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 a 20 9 xuukqjg*z*z: id6m0-mF capacitor. What is the impedan*9u ix:uz0 6jqzdm*gkce 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 serie.j18 ;vez+d0uf3rv 9q fq drxxs with a 10-mF capacitor at 1.0 kHz for a total impedance 0zxd3x vre9.r;d vq18qu +jffof 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 8crh,rrbi m-69cof 5a z)kmaari,,/p with a 10-mF capacitor at 1.0 kHz for a phase anc5o m-9bpri,kr8a6amf) a/ i,zh,cr rgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor26vbf+xf , dgr+z f7na at 1.0 kHz for a total im+dv, n6+2gz rxa ffb7fpedance 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/mwq9yh 0ghz 0 jggi j:x*.)ys 100-mF capacitor at 120 Hz. What is the pha )i0xgw0j/q shzgm .j y*y:9ghse 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 100hgoydy, m8o40/f yg/r6r6z ri -W resistor, 20-mH coil, and 1.0-mF capacitor are connectrmy i,hrfo/y06 48zor ggyd6/ed 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 ;aqui 5b5x.-glshc)mhp5 l0-g8i r x ac9cgf;consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suppll.x5fx;a-a90q5 h5 sib8lg rucc- ; )imc pghgy. 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 capacy/3b-;.ot;g/ z ry2ixoljkj .0ro yieitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circr/ktg0oy;oxiybl/r;2 j-y ozi3ej.. uit?

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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 contzx/8len x )e0naining a 50-W resistor, a 10-mF capx xe80 e)nl/nzacitor, 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 5o b jcc5 +y4hx6p;xxz000-W resistor for a phase angle of 6;coz450xc hp+xj xby$40^{\circ}$ 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-mp 9iftckk 7b/(H, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum pok(cp /bif t9k7wer 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 resistance, 15.0 W , b1 svj4wy;sqinductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to 1,vws4sq ;yb ja 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 avqu/* gk3r s+pn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of z7yotyv.8(to6ok) 2 apos,e e60 W and a resistance of 30 W. What is the power factotsoe8.y2pt( eoa o,7 vyo)6zkr?

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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 5nl;b2( ;h tls0 vun+t,c syfsRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppc bt,(5nvshl2t;lnu + 0ys ;fsly?

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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 freq/ )kc wpvxq6d7ix)s0wuency of a 1.0-mF capacitor and a 15-mH coil in series?cw)qxk 6ipv w/0) s7xd

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a reso6q xdez. hi43 (czuk.sw,q vxf8 0h*aonant frequency of 10 k4zhqv8i h.s ae,(zucf3d xqwo0 .xk*6Hz?

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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 ser-th-r wo(lko, ies with a 3.7-mH inductor for a resonant frequency of 1000(krt , -oowhl- 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 a 40-mH; (olad*5*d-xf xfz uh coi(;uhdff-5oadz * xx*l l if the resonant frequency of the circuit is to be 1000 Hz?

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