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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  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 arubfwa w i-gktl4e*0yp6t ; -3re 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 that the wwswc9 s0jp-m;4u z:u$emf$ 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 change on t9( c 1ktbi,tbzi9(t1t,zkcb bhe 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 through a loop oxdsn*k9x5dga/ v 52ozf wire produces what kdg55szva2nod 9*k xx/ ind of change on 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 prod93fklcm o )n r0q)bvlt (cr.k,uces what kind of change on the indu3fcv (l)rr9 .notqb ,0c)kk mlced $emf$, 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 magnetic fich7 wusek,+n 3-ors:ml4py l2 eld 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 oltzzp x p,hzlp,*.0-jf an induced current in a conductor will be that which tends to produce which of the following -0j p z.pxlh *zzp,lt,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 horv lb ; j)(6/ofyhs :1deac6v/pio1nx bpq1+cdizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from ab1e:xnc6lsohd/va(6j1b pcv1 fo+b/);diq ypove)

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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 heb.j dwl;8 ; n9fwzha(+w pib9bld above its center wiwpa9 8wz 9+;.hwl bbn fbij;d(th 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 magneti4bqro xs :qf. dtoi:x0 /qz.(yc field vector points straight up. T:orq dqox. 0y.z4 i:(xs tq/bfhe magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region whea;yf/oqe2* wq re the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the in feqy/2q;o wa*duced 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 ru/z1ufus2k ( horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed fromu2/ 1szr(f uku 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 tabio7 k5wass*cp y v( u*94)iqqple and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. s9ypa5i(p*uos qi ) *k7wcq4vWhen viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with t.cctrtb0 ck:bm- : (ds21cqo ihe north pole entering first. As the north pole enters the wicq dmbri2.:-o:( cksctb ct01re, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wh(f4a9x-th yo -m:s6jwejy- ab ose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the -b4 :eh mjoaxf(9 satwyy6-j-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 atc59pist j)yenv52)ufdvxa.7e0wsg52 4x upw constant angular speed about an axis whose direction can be varied. I pjav ee9w)2x5cwsx ts)7nu4.5piv25uy gd0fn 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.fm eq*w.3 a -8i) roeguit8zr(
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that a:ijm 9::i4n vf1fi godn $emf$ 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 magfi.,2 d2ap: yxtsxp )ynetic 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 directionncru 2u 6kfvbyc42 9g7) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across thfn 2 y 296uc47vbucgkre 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 anguq /2,,khhb fuhlar 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 trcs7+olzf 1dlka4,7 x gansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequen,u 9 4l5bkiylvw6yh -k31ejmdcy of theuw 56ye3l hjbv-9,d4ki myl1k $emf$ 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 us;t e yp f(:m.ka6t+pvged 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 twv8j50 -oxy gshat

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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 secondarif+5uhfw8p;p 1 xnke /lc- -vuy coil contains more loops than the primary coiu /;pvf8i-lc nw1+hx-k e fu5pl then 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 prim ysl9l 4ew8)duary coil contains more loops than the secondary coil ty s udelw9)48lhen 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 pnoela 3zc ful(7,e -y+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 1uz 7s j(zj0dhp,t(p e k c5*qfxo1ql;circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideub-( at lcxu(2c t jug4 7q.vlmyu7gzm*5h:t 5al battery of constant terminal voltage. At the momentcmtu(j-t(vgzg7clq u*a l 2 tu7b:humx.554y 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 08v(. kagial(v por)astpw,(to an ideal battery of constant terminal voltage. At the moment contact is made with the battegia(,ol)pv 8(0 rakpvsa .tw(ry, 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 resistanc1vrws,3 c m* ebymthl:up:j.k; k /.wg hfx.q4e 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 * ycp5j5x2hvo 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 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 battez *yuo)d)d vtcvlt6 *+ry. The time constant for the circuit represents the time redt)do y u)ctlz+* vv6*quired 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 inducct j:-b-/ jacrtor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the crac- bj-/tj c:urrent 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 units1xt r5 p6 ;gu7wk)oekeqcal(1 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 cihexg:;j x2.m arcuit, 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 circuiiu v*l8etvb ;1t, the currentv t81iv;eb*ul

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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 factor wh71g8zzle 1 vlxen the frequency is 71 gezzlv l1x8tripled?

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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 jpr r i6h4/4-4f1 uwposk-ets/d4al edoubled, the inductive reactance u/-p4-1 kh6ers4d 4i rp/fsjw4etaol of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, hos5/nv5hh,n q2 yir33aj+i g the inductivi hr+iongvh 3qn3/5s2ya j5h,e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. I 0sm4aqwtns *j78zb 0gn this circuit, the currezq8sg7nt*s0wjab m40 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 changes by what factor when ta 6,: :ic+tlxioo 6jz u:yuu:zhe frequency is triplez: ,x: iu:j ouz6u6otacily+: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 voltage aobnkr8djj*vq m; (kxu , ob778cross a capacitor approaches zero, the capacitive reac nd; j8mok7 vjbb7,*oru8xk(qtance 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 angleteu(etk 3n, z7 between the voltages of the inductor and capacitor in a 7z3ke(,et utnRLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an *3 c)z1emwhkx n+(caaRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedavr( vol5cuzje 7: 0.pj 3a*px3dle,tsnce of the circuit increases if R increases. When is this statemenv* co(e. 53tlxdj,0s7zep:pl rv uj3 at 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 impedancep2 szgfr8-f3wux2u /n of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit inceq4w i dn;rp96reases 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 bot0k 7v fvgut6z7h double in an LRC series circuit, the resonant frequency of that ct0 vg7uz67fvk ircuit 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 byf)f(xktsln * 0l(u4vpl ov+/ o 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 z.i*/ u c4v bqmygel:m */zln)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 radius 0.10 m is rotating in a uniform magnetic field 5 2,a7cgmvud cpd.+ ucof 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parp+c57dcvu ugc,.a2d m allel.

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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 . lvkp9oxdtb8z2e4bt/h k9 h:uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magt./pk bxbd:h4leok92 9 8thv znetic 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 ak 6.yq ,csrrw zk/jd8* uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thz.yr 86kqk/s,dw * rjce 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 loopg4)d4fz nse8am1t;;q* vp (c1qwwoi5skiv5q 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 qx * ojh+8*ewvchanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. p3a/:nabyl6 t;/gb lyA uniform magnetic field is applied perpendicular to the plane of tnl3p6ylaty: b ;gb//ahe 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 15 turns and an area+*11i k 0/zudhe5 tn tfyba*vn 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 area7 mlqgqn-h. p l8a6v;b $0.20 \; m^{2}$ 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 winom 7trn3 v*-be oav7;vg span of 60 m flies horizontally at a location where the downward component of the Earth's magnnv;vmvotr 7ba3-*7eo etic 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 anniz9 qw: wx -j7p5spt7gular velocity of 2.0 rad/s about a 7xnj:iq7w- 9t zpws 5pvertical 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 acdtv :eaf2 *4hueq;.ds:b bk 4rea 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 iq.7jk- yfu,wp ,a;mp 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 zk2lzadpr :6s q.9h,qits armature. Each loop is 12 cm long and 8 cm wide. Th9sra2p, d. h6:qzq kzle armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consi s2gpqq(gs )6zsts 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 genera.oxrp k5ud4,bw(2zw*e ra a; ztor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotax .a5pkd;rzr42z,o euw (*a bwting 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 generao2fp9;y :ta ee3pl 6wu mlci.7tor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opeekg wablb, ,74kip +0trates 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 op6zhnca)l4 c+l erates on 120 V AC, and when running at full spee)4zl6+l chcan d it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power su5d/ )b8jh eirfpply. The operating current is 1.0 A. ied8 jfrh5b/) 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 supply. Th 6 dtcn:bss//vt/*x2wvs;oy,q/ lo zs e operating current is 1.s/ ts:vclx sv6o/,yq/s /oz w*bn2 td;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 resistanch9sz:g/3s hq//lpjj mm,/zyne 6.0 W is connected to a 24-V power supply. The operating current is 1. ,j9/jnm:lq y/hgzmhs3s/zp/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 lj5 s*p s6it ni7(qaf.of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 v:uxu o 4wuhlk3/rsy- 2kn8)w A to flow in the secondary. How many turns -3x4yo us/h2 :8kw)lruu knvware 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 tu ko j-1iyndfq b213y:frns are necessary in a 110-V primary if the 24-V secondary has 100 t1jif q3kb-d2: oy 1fynurns?

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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-tug 3vkkks 7qp+igd 49z1rn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current i v9kz473g gp1 ksi+dkqn 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. Assuminjyi+ g xk6i-;bg 100% efficiency, how many amps at 24 V can flow in thj igkyx6;+ i-be 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 nucyvre g5:idd a1 9b0-eon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 19bd0gu a1yrci:d5-ve20 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 (i cood7a.hk/nre3: tits primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage (ero/ n.io:k3 dh7ta cis 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 tgk1 cf)5kq 2maurns on its secondary coil. If 120 V amkf2) ak1g5qc t 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2 gyc2wc2:8epj 00 turns. If th:e2cy2 wpg8j ce input current 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 hargnxo92 )0gpi vqy j27s 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volq xvy20pgiorj972)n g tage 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 seconx 6q1mt8hg)xw kx;dn+dary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secgkq +nhmd;6x xw tx8)1ondary 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. Thezguwm1 *tcj h*2v9 p4y 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 the secondary if the primary has 2 9*pj2gmh*wvz 41 ytuc00 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 12pn/guzs.( axf*ar 0+i6o*wn+2hmbf, )khque 0 V. The voltage is usually stepped up to 4500 V by a transformer and transm *uu e0q*hzar )mpki/na+2fswb, f(+nxo6.ghitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tb*u/vrgo(c - (z vp(tghe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total r(( -buort*/(p cvvgg zesistance 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 f qfr y sjub. u+owf4; b;-c4:omwd3+fof 0.60 W. A generatorj wfb+f ;;-uodu rfmc43 bw+o4yf:qs . 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 lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a tota c,x s7/yazr56qjk-zs ,wme. 9t j3lvil 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 transformer with a turns ratio of 100:1. What percentage of the original ex.5 ql,vti/z- swsz7 r3ekmcjj9a y, 6nergy 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 uieyif(2l 3-aepg;u. l( )zeh much less power would be lost if the power were transmitted at 3000 V instead of ateug lhe(.z3 e-a i;iu( lyp2f) 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 transmitq jfo*7z(jsi-f/3ofg5*j q qnted on a line with resistance of 0.60 W. To what voltafogzj5fi( /73jj o*qnf- *sq qge must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is st.*o sjgt*ym8go/3+1a ww tstc ored in the coil's magnetic fiel tw3 y.os+*mg t18gj /tcoa*wsd?

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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 resisto5zm-h;zdp cj 4r and an 18-H inductor. What is thi4 m;pzc5jd-z hs circuit'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 circuit where the riq xnjfu )8+*2mus, rdms 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 ouql9:(ta t e2o- sr5i9 iukz.tmtlet. 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 * j2akur0uzslym1m 5 8120-V AC outlet. What is the resistance of the lampl1u502 u8kam *z ymrjs?

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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 vvl5ggd tm32 0supply. What is the peak current tvv 53gd0tlm2ghrough 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 the4 r,k)53aq)bi2 j,rhf1yy b efvzhlw ( power dissipated in the resist b1hf e rqvk jlr),wia)4 y25b3h,(fzyor?

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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 gnqql,f-d58 . oa vh.zresistor 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 4d vxo)8ru:xz 4;rv-6b1 a lrt6ljeqb a 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through amqgnlf:7- ,0va l1t ( hl t/p:cms -hqjrl8hs) 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-kf)*0xq spn(sb)u j7m 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 reactap f372r9 mmjz*ppe;lbnce 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 havencd prh0, :rp+ 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 re6/ 1m17njev +uwz7sih zt-on.dc 9nvtactance 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 t 2j(9f2v wurtAC at a frequency of 20 kHz is applied9(2ujwrvtt f2 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 a7ly tqwhpwbl96 h-e50 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- t,2dq5fkl57p nci i)nmF 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 iskbpa9fn84i6yc7h v3v,* 0f n3qtwfav needed to 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 capacitor have a reactanceo dfpr6-olc*ht, ,u- t 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 capacitikzz hxfq9- ki) s8*n(eve reactance of a 0.010-mF capacitor be 100 W?en8 9kqi (hsfxzk -)*z

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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 c1qfcb e h/ei(ud:h;4 9uzyd;bapacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W ; )(c5d4b 9k7uukmdh * ffzsiiinductive reactance, and 10.0 W capacitive 9kdhz74 uk )iu;if(mf5 bcs d*reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coi 6oelq8bm,xor*7 i vp1o 6(sagl, and 1.0-mF capa6e,*o6 ix17gbq(osral8v op mcitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, hgdy .mjiguxz 3 ;g+0920-mH coil, and 1.0-mF capacitogjdg 3 .uhz;+y9mxig 0r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected i5pn)-kpgh7 8o:fdatnn series with a 20-mH inductor, what is the impedan-8 onpk:t7p a5) ghndfce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected2 naz7/ +p0le uhyiiu2 in series with a 20-mH inductor, what is the phase an p22 / luhiy7aeui+nz0gle 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-mHr9oq o-jad z2- coil and 1.0-mF capacitor oa-o-9qrdz2j for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in se8uxlzkn+x.7p ries with a 100-W resistor and 15-mH coil to get a total impedx zlxp+n 87.ukance 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 i +dny:gzedq po4(zk;-zf9y/ on series with a 450-mH inductor at 5000 Hz for a total impedance of 400yzk + -ozqgd9e f/dop:4n;y z(00 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 resisv qup8f 3bcot.s)v ,k.tdg s. i/k,*xhtor at 1.0-MHz for a total impedavix/ks..f )oq8tvbcus ,h*t3pdg, k .nce 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 iiktov 0dg9b suu1x;s xm0-j6;n series with a 20-mF capacitor. What is the impedance at 1xub-x; u 6 vo0jdi9gsm0;k1s t000 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 cabz/5 kpift95s pacitor at 1.0 kHz for a total i5 stp9 5bf/kzimpedance 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 vd7*4ry)*u e b4y /1u1sgmnutv,iy ad0oqg j.in series with a 10-mF capacitor at 1.0 kHz for a phase angi7/d) tygunu y *r .vmb vy4,e*sjo11g0qud4ale 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 resistor at 1.0 kHz for a (cgl95bl9ecl total (l9c9bc l5leg impedance 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 120 Hz. Wha gaxvl1.z1frzr67-2 exahz 3 ut is the phase anglef x2 7hzxr3zr-g61ala1v.u ze?

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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 uou7+z1;up;8 dvj dzy5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci p1j+;uovu7dy ud;zz8tor 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-mb6 4 o9.fxs+,ky8zvn1qxo,j/fmixb p np) fb2F capacitor, and a 0.350-H inductor. The cir1mf,6 b of+kfq 8xix ,2n9z) 4bppyojsxbnv/.cuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inducpd)icev;8+ 5cl m3dietor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz)5dm3ivce8 pl+i;d ec 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 ses q7v-vowxw8 h5nkf1, ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-hw,ok 8 nqwf715v sx-vHz 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 resistor fc2--n8c tfgxs ls *ujxu 227yyor a phase angle of*u82g7 ly f-2jcs-sc ny 2xtxu $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what freq1klq;3fi ajs2 i-v+i i qd;pg,uency should the circuit be driven in ordeakl +,; i12vjf -g;iiiqqd3 spr to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac ser b*:,nb02s2 g.)rb;uktvbkbf j kzgx+ies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is cg r:+v0tk*xsb n g)u.b;2zb, bjfkb2konnected 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/l* ho.ybrou;f*(i j e 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 60 W and a resistance m xt3f5xzl66lof 30 W. What is the powelx6 fm3 t6lxz5r factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing m )p0/l ltsxrqahl0; +7ghz.9*nyn ama 50-W resistor, a 10-mF c*/+.l gh zyqr00smpxlt )anh 79n;lma apacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15- nhsnqn4 78kn:mH coil in series?nnsq:84 7kn nh

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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 xwtk,mj.wt s4;oc./kk*c c:ha 4.7-mF capacitor for a resonant frequency of 10 kHz?o*.:w mkjk,s.k h wcx4c tc;t/

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a re. u; zj9b8 )c eu.vm9wdifd/pisonant frequencv9d9 um8c./j .izi;) wbepf duy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resi sfp1 u::m(t-exwc r*ostor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz op1s:(*-xctew:m ur f?

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