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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 ,o a hozgc 8-al ne cw1(f*n/37mca;pkare units 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 t/ v-mtxj7k n*dr/klx8a1d apvos9g 8,hat 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 loop ci8mfo3ymm3 -z6.c:o ob+ 6hwt* nrpjs of wire in a coil produces what kind of change on the in8iymmn fcc.- or:wj mb+3oz 66*pth3oduced $emf$, 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 thrz-h2 *-hao uee magnetic field through a loop of wire produces what kind of change on the inducedu2 za*-re-h oh $emf$, 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 is:a3 wsgsy7 0produces what kind of change on the induce0:aywi3sgs 7 sd $emf$, 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 magnetic8b;wxj2ps(0n ls4wgp 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 directiobe2m*5 qeo4lh (ef c0gn of an induced current in a conductor will be that which tendeo50feq4meh 2 l*(cbg s to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne f fn:w2v hivx+qo47yyfti+*(2 yxje:t is held above its center with its north pole pointing dowf:iy:xvffet2(4h2qoiy+v xw*+n j y 7 n. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizonei6v h5s()qfgc2y 0ynh bp+ e(tal table. A bar magnet is held above its center with its north pole pointing down, an(epqinb+y 5y fh(0s6ev)2chg d 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 u oakp.1j,f/ ha table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current inu1 f/ka oh.pj, this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vecp fkd**a *;rgp1 fjjy8tor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced *kdjp1a;fr ygj8f*p *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 tw, ju mk4kxsg8dn (9/3uga5bdable top in a region where the magnetic field points straight down. ka,/5m (d4gd j3xnwus u8k9gb The magnetic field 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 carries an everowz b p 98:6:c7u3prnop zgl2r-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current cr6bop 3:gcluop7zw9n pr: 8z2ircles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north mocs;jck:- ru .(u 8xrpole entering first. As the north pole enters the wire, the inducrro8 k-ccs( uu;mx:. jed 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 k741 ksi hj/z2,pgm6c wgtwj+ speed about an axis whose direction can 6 hwzsti1, g2+ /km 4gwcjpj7kbe varied. 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 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 ro261p b: phu0u3 q q57kz4nb(wsdxdhprtated at constant angular speed about an axis whose direction can be varied. Ibr2(51:sbx73kdp0 p6h pdw uhz4uq nqn 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.;u3vx+. ,,+xx ecw msdhhwy+v
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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 d/ds7/ jce/m+ x8my,riksg4 tthat 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. yex/sywfip6u7dk* .lur 5e62The $emf$ 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 ea (lrz;m4p ey8ost-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potel8m;z4r(y e pontial 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 co69-ddpc ibby f*ij-t uyxnd p;6*h3t2nstant 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/.pwrpm8m0 8ypez 9/js pfm i- transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates 3qqdo:sc:5 hithrough 60 revolutions each second. The frequency of the :h3q5do :iscq$emf$ 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 deviu533izp3eye*w xf ..+i vtotsce 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 devicdg6k -cr,kmp ;g +eyn6 it0qo;e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primar5 -p fizt26k pps9+iqne)m/cby coil then it is5+6kc2e)sf9bpiiq p-/p tn z m 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 loosg(36wrg3pu: b uigf ;ps than the secondary coil(wg33 suf;uigbpg6 : r then 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, thf1lx qryu1k02) yb+s+ :qlo uoe power 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 circo8o hq7lde.,bysa +ekb::rl) uit,

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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 i;ly .g93y tz5gks+ opxdeal battery of constant tey;k5 x9+glyz3 . ogsptrminal 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 inductor are con( a pj.kvigf, :61ezictbr1f vk -4p:qnected in series to an ideal battery of constant t-i (z,j:4kak t:bfp vifre .p1qvc 6g1erminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistanc 68u,ikjqksg 3orl0:ve 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 tj,(ng(qhr7 w ygb.)ey8-oqx 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 a bag3 bd6u b()f nmn)s-qlttery. The time constant for the circuit represents the time required for thef (mnnbu)g- 3lbdq)s 6 current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bat5 -n)ds7wwot ko2us w d3;4btttery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease 4bo)t 32ussndt7wd-k w t5w; oto

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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 uyh ;lz rl 2ab0gt-p54bnits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this gfg 622 zkxx5s q/m0umcircuit, 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 this circuit, the ci+eoijz:1;kzga0wnh15 xb5s urrentkjzx1 1ige oza 5sbn:w 5i0;+h

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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 change4 ; n974ttykieukgvq/5(yf9 r(xw co8,pcsax s by what factor when the frequency 5wux7;ognf4ckvp4,c(x 9 (ytt/isr y8k aeq9is 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 AC voltage across an inductor is doub .cc)s6 p- ni-osrt1cyled, the inductive react6cr.nis o sy1p--tc) cance 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 thp wh;nkcef 0 1k28g8jq:-kfexe AC voltage across an inductor approaches zero, the inductive reactance of that coi8hwk pkek8;0:- qf1 2gcfnexjl

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thr1np,b /pc)fw(qkzqz5u (k i 3e current(prqcf1 /nb q3 iw,zu)5pzkk(

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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 c;nnte19hml- ,*xindggs i9; vhanges by what factor when the frequency is tripl1;htnn*,i 9mvdne-gl g;s 9ixed?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capa1jz0 ep(jw bgl.v:u7ncivjw.l( 7pjb10 u:enzgtive 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 ib 5)q+srqpkq l, m4x0fb17avbnductor and capacitor in a RLC lq mqa5+ q7b,frpx0b b4)kv 1sseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined 2z.( vcd)5wib .bd dbx;cjfn6 as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R insx s7thsoh86.e)i7cy, 8vp tqcreases. Whst.) xqh8i8vyp77 s,c e6 stohen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedan.b yg0it qjwv, o81f2fyeu3;lce 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 iho ,e0z c ump;bz loemfm)4 y*g9g7)k;-hj9mx mpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series cr.adh z-.3x dcircuit, the resonant r3czhda.x d- .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 enr;3y.g u);gkw /snris driven by an 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 RLC circuit occur6 xxz kv;6tvf i5ttv/b43wejcp40 bej42/ofqs 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 l; n9*za0eubh. jagq4is rotating in a uniform magnetic field of 0.20 T. Find 0g*j.9qhz;bl 4aeun athe magnetic flux through 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 uap1 y 9)b-nkiq2.gl wu2 xou(gniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag g29u-apxguqb 2(ny.wli k1)onetic 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 d)9: g6zhq1x rabd w*vis rotating in a uniform magnetic field of 0.20 T. Find the magnetic f )x: h6brazv91wg qd*dlux through 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 adjustable single loop is reduced from 0plrf,1jin4h $1.0 \; m^{2}$ 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 fromiz)m p/6yuvt/q8* cnz $4.0 \times 10^{-5} \; Wb$ 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.met)x pos(ask s5te) 67 ex+r1d7 frn; A uniform magnetic field is applied perpendicular to thepn se; t+seox7 )dkf5xt)(srarm1 e76 plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15qkbi,btzbuj(.c d- +j ,1f8wr turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns +l6fmh,fo(3 xxfx *yf and 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 at a locationytn1o 7vwq0z))kw gn 9 where the downward component of the Earth's magnetic fiet9v0no7zkq )wn y1gw) ld 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 velog8pc*wb,;y8ok 51kbpwx ;ln tcity of 2.0 rad/s about a vertical axis through one of its ends while in a constantog pnb 5cwxp l;ty*,k88w1k;b 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 vbz/19 )ecl7/-m8mir uykrinand 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 turhr5,rsi)31x7 fozfyv ns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 124kk .-3sdihm fw e8vf* cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axm3ekkwdv -48sh.ffi* is 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 consi i/mqc4b icq78sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12 Vi2aj -o u+)c37tsdy:; t(skeyq;oygn maximum when rotated at 60 Hz. A magnetic ) s-7s(jd guak+2 i yn3totco:yqy;e;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 g,-b yybsdm5,nw:e;c venerator 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:pumo-v33.g)d mezq fhpt 9a8 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 resistany ),hp cf:giuaevo74/ ce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatigf/v e) ypoh4a7cu: ,es 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 g 0fpq lduhi:hhbgdb, 3(s -wxso6/9,6.0 W is connected to a 24-V power supply. The ope/bsd:pq-s,gfuhh0h3g (6l9i, x dwob rating 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 resistance 6.0 W is connected to a 24-V power su;wu7 lc zxs:+xcc1w vc6te7 a8pply. The operating current is 1.0 A at full speed. 7c+xax z v:l1 wwcc8ec 7;6utsWhat 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. 9v7xdledg *t-)cfdcu m 74hc*The operating current ish4gx cdf v)decd7m*u t9-c*l7 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 transformw4su+v1e/ivsr5 - qo-b iqu5ter is needed 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 transformer tsizv n x3a* :(dta lu+p57an(causes 14 A to flow in the secondary. :d(vt+i u( 3x*5zant an7spla 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 24-V i )ag +xr+lres.a fds,0c k:pmve*7 r;secondary 0rgax+sf krvlm dpr.i:e;)ea *c +7s,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 t5mw: *l u05oykmz wij*,,ai ka 500-turn primary coil and a 2000-turn secondary coil. If the currenty wm*:50, ,5awujtiko* zi kml in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. 20gvlx*blx xk8lmk;7i fl7 ;v Assuming 100% efficiency, how many amps at 24 V canfivll 2778k;vlmkbl *x0 g;xx 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 nm) fhb aoi1 +jt13yyo5eon sign transformer provides 7500 V at 10.0 mA. The primary coil operb1 )5tmy3joih y1 fao+ates 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 (fjkw r.;kcm7k 0lj/ hvq7i 2v60 turns on its primary coil and 300 turns on its secondary coil. If 1lh2kqmck0i ;r.jvwk 7(7 /jvf 20 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tukqt fz6 56uvzm4z -5worns on its secondary coil. If 120 V at 2.0 A is applied 4qk 65ozvt-65fwzum zto the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec.s2l c ++aw wu*hfpjw0ondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the sf2+w. cwjah+* swup0 lecondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Ifjjfjr:5q ./ nrg ena3aw(1p2g the input voltage to the primarr3 (aj2/5gfj njewqa:gn1 p. ry 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 turns and its seconaq + aig)ah:4sdary 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 qah:4)sigaa+ 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. x6kbu*7ldmmer 7 d+4t The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in tt7lu*e rm 76dd+m kbx4he 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 vor bxy71o2 lm5oltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the tr mlyo71bxo52 ransmission 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 Ad6nwg7l9j n3l of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted th7 3w6ngdjl9l nrough 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 resistance of 0.60 W. A gevu nw l ojvqaxr6zv-e5luh9s6n125 87nerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be hnlv2uj6no 8 a5zwu-xl5 q e 1rvv97s6lost 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 sqlc4i/f 0a m 6npx wy+67vz-ra 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 transmission line, the voltage is stepped up with a transs6 cmw l7qvarxnpfzy4+/i-60 former 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 downd89. w8 (/w+h 2zt fmzln ej*uwdrbtw; a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V rw*ljetu./nwt;8 +z 8wd(d2fmb z wh9instead 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 zz:6po,dghvn4l mj5 5 is to be transmitted on a line with resistance of 0.60 W. To what vo m z,6oz5dglv4p:njh5 ltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A.h0)*i vrf5wp frs:w9v How much energy is stored in the coil's magnetic f fw* 9rpiv)rfv5h :w0sield?

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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 resisto4haisuybp2/k/f vdby ;e i-29r and an 18-H inductor. What is this circuit's time constand s -a92fi /b4p 2ekhuyby/v;it?

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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 circuibst9w+ph r 5*.6azxrlt 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 imh/4h4 : )phfmj jmdc3nto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is t, )i8bvau cz-the resistance of the lamui -bv8),acz tp?

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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 pe 3b5xmg4hxy,v 7g-zghm d sy)8ak current through the resismx,m8bg yhd 5 ys) vh-x43g7gztor?

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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. /9ppkpkmm-;0r* 3e dyqg 2sazeyvp: *s3 7c waWhat is the power dissipated in the resistorykcdrk: 3-g*vswaep3q 9sapp zp ym/m0e;7*2?

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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 resistofu-b jfbr9hf4e u 8, ;ui,x;zkr 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 rmfhur 2p) v0d4g47mmsesistor 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 ahn/u(0dk7(mp,jgigp: e jx(kn hq 8p) g vas40 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 o9m7 w esq1(ffl vn,nq-s;/v auf a 1.0-mH inductor 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 re 1woa n;i /)r8o/ku/swjjlt+eactance 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 uqsy4gn * 0w wy+lsm;(ie0w*chave 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 o a lvqcf+p.0-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 whep67yhlnc b b1 b/+ot-gn 120 V AC at a frequency of 20 kHz is applieb n thobbp 7/1-lgy+6cd to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, ka (lsot0 y2qr-7ca, )tr z8auyt.fq,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 capacitor aqqa 4exb,xm8dai4/s4kt4b w ,t 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 ofhpm.ogi 2vrd-os987 -t 6pptu 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 ,ex ep p:y+v5 6jgvlg)a 10-mF capacitor 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 th-3uxnab(pvo 1 z*hn 3ye capacitive reactance of a 0.010-mF capacitor be 100 Wpy3vx* o u-h3( 1zabnn?

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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 7,s aba n u)z5zpatopp5p4x +20.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circvj ,z) shoapym,l0)0ity,*4w wz lll1uit with 12.0 W resistance, 15.0 W inductive reactance, and 10. wtlji,plom,014w)y 0 ay)lvlz s*,hz0 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 a+ k:ajccyfko( :w- tus:f6n3st 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are con:kcwf3 u6aj kst:f :osy-n +c(nected 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 a/g ,yz+a9x hrgpdce si,l2)hy84x*nbt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in snra)xd l cxph 8g z9g,hy,2ebi+y4* s/eries?

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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 wit9h)y :e t7dr 8,js0vw90 w*stmlqnmjeh a 20-mH inductor, what is the impedance at 1000mqm9t9e 0 nwdev8)w :yjh*r,7 s0st jl 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 20-mH inductor, what is 8vnn o,/nul o-the phase anglv/o o nn8,ul-ne 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 an kp.c8 ;he5qkjd 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz?k.jk h85;eqpc

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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 jg4 3ttjza5si1o5pdpkkg/ g*a5 +of 9 100-W resistor and 15-mH 5t* +4j oppdgtgfk1 ja5ia/ozs5kg 39coil to get 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-mHy38llke3d3shh e.jx 3 inductor at 5000 Hz for a total dhl 33xse.l3j8h ey3kimpedance of 40000 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 with a 100-kW rtqd+6e*l4 artesistor at 1.0-MHz for a total impedance of *+t4rtadl q6e 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 serme p7xr2kosr5/ lhw+fl91 lkh)(nw: gies with a 20-mF capacitor. What is the impedance at 1000 rn5lwe9p ll+m k(wx: sok)/1fh2r7g h 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 seriez* h*bqhtu: tf k(ap8jar3t73bt(go ; s with a 10-mF capacitor at 1.0 kHz for a total impeh rqbzbfat((*p:j k37 gu o;3t8*ttahdance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz formd9lu94u shc5 a phase angle of9 d95u lucsm4h $40^{\circ}$?

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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 seriesar2)mbdcm hzwpq*e ;4(nm+ p9 with a 30-W resistor at 1.0 kHz for a total impedance ofqw 2 m)pcmpemn4 r(bd z;9ah+* 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 sasg )wza,:ju5z+i 9xtyq:ez 6ybn:g 5eries with a 100-mF capacitor at 120 Hz. What is the phase 6uea):yqi9gzt zgbn j:z+wx 5 ,ay:s5angle?

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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 resistx5p; i6bgfh bw9 +y9w837iw j1iotpivor, 20-mH coil, and 1.0-m9w 5w8 6ovbxbi3i p;yf+iwpi9j7 g1thF capacitor 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 capacigxg.i8bhfd 3e: t6; kctor, and a 0.350-H inductor. The circuit is connected to a 120-V, 3 idgbc8. fk gh:6x;et60-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 reactance 30 W, and an y1c(jqf/18r 2lti ilg inductor of inductive reactance 30 W are cr1 /yl2tc qjl 1gifi8(onnected 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 cis2h.khj dj*jut,c*,ca/9a g, 1 ly;orblq9q hrcuit containing a 50-W resistor, a 10-mF capacitor, s, 9 *c*j2rl c oqh .bj9 ,udgh,yhaa;t1jk/lqand 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- muh*y, pek lal*26mk3h8l /fzW resistor for a phase angle ofh2m3*/ kzlu*l 8epmkfh,ly 6a $40^{\circ}$ 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 bo6*-vh,alx/ azzhj -W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be dv/hzz jab, -- hx*lao6riven 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 outpgshxkf32j w. )ut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac3jg ksh).2 xfwitive 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 cirhh(;esih xo, g037mt dcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a ,o/ g rzn57ifwfwar3;resistance of 30 W. What is thw 3 f7irfoargwn;/,z5 e power 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 facth8h +80 f:llopllx0(; h da bq-cl;iqtor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-f hl qld0+ q-h(ao lcl0l;x:bt8;h8piHz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil inq 7(-h)sxgkh l series?s7qhx k(g)lh-

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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 serh g(bpc( 4t2ke3k y(l8enml8ries with a 4.7-mF capacitor for a resonant frequency of 1l(pl3( nkythmke84 8cb(rg e20 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 serc -gc5r daa6:nies with a 3.7-mH inductor for a resonant frequency of 1000 H:c n da5r6gca-z?

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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 x.e yv:b(3paw resistor and a 40-mH coil if the resonant fr:b3 (w.pvexayequency of the circuit is to be 1000 Hz?

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