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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    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 untlh-w17y5 gjm mns39/ iz ton8its 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 q* /e 9lsu5iqpthat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wir .x(izr6 h irr:uf;e)ae in a coil produces what kind of change on the if)r x.hzr e; ar6u:(iinduced $emf$, 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 ;h xd c 3vzb9bm3w7g7c;z1ipc of the magnetic field through a loop of wire produces what k;zpv 3i7 c z;1cbmd7 cb9wghx3ind 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 producesdje2l,hdd ,:jrip )6s what kind of change on the induced e2 )p d:,djhrijd6,sl $emf$, 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 a5 d 2oynq)82rlj c3pq8ebeocgi20o+magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction ofllfaf4 ox;e y;aw5d**djl6y4e; m* tz an induced current in a conductor will be that which tends to produce which of the following effec ;*t a *defl*4aly lxfj5e;4z6w my;odts?

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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 magnet isorwva( r5a5m .0ip-sq held above its center with its north pole pointing d i o.a-0w5rs(qar mv5pown. 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 /vv lbn.ko d1jal)g,fq4x -0ghorizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from a1g/gvqjnk,xvl4a0 ).olf b-d bove)

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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 t : 9gp,h w:j48j+r f3il29gbnoaiwzbpoints straight up. The magnetic field vanishes suddenly. When viewed f3j t:b go rnj,l+ibfa99w2z48 ipw :hgrom 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 th k3rmm2mx;h;cf;i ;kop in a region where the magnetic field vector points straight up.;fi;mkmmh23r;x;kch The magnetic field suddenly 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 tab/1(yjk cn4b7oikfy1 qc9rm; wle top in a region where the magnetic field points straight down.cy/jbi wrk k19qyfn4com7 1;( 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 carrx 03hwx73qi;+sjn)jsq g mvq ;ies an ever-increasing current northward. Two coils of wire li7mxj;+q30h;s ngqix3v )qj w se 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 through a loop of wiretj( 3. q5ikh*oujc) wy with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from w3 ic( huotkj* 5y).qjabove)

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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 angu6.uv.q1tu 2h tz5lrk tt,p5yular speed about an axis whose dirrt6 uluzp5t,u2y1 kt.5qhv.tection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of 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 constant angular speed about an ax45)+khk1y wz) )crpo-y juxfp is whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop'sy1o ) jyp-hck4w) zxp kfur+5) 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.w7 t7 qp ye74katr6f7y
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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 0vpx7,naq6/u o9hzzon $emf$ 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. The4 x*x+quia nr: $emf$ 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) isz6mb qai;1kdvtza9chs*bgy23).4nm moved northward at constant velo) 91gn izqvmt2*;s46bdm z3byaka .h ccity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a y,w5x r qnoq,,constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfdd 6u+l7p0wmv6 ehtn 5orms

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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 thru0z 3q yp nd25+mbbyq6ough 60 revolutions each second. The frequency of tqmb6z 5up+dn3 y0y2qb he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tox/l 5lwdhc6 2bih 77ed

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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 thatevb9 su11-bk woy2v-o

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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 cvt zy*ltq .*r//a e+fcontains more loops than the primary coil then it isq+ft.* a/t* r/ evlzcy a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary c kqcf8.b0 yb*.smr- skoil theny*0sbb-.kfscm 8k .r q 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 poweo fv0.twab: s*r 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 circuitlcd 8 ,ut6ewg(,

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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 ar5n( tgvu*7adle connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage d5*tna( 7l uvgacross 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 - nlt*k6it18ynqh a;vin series to an ideal battery of constant terminal voltage. At the moment contact is made with t 1ty -ni*thnq a6k;lv8he battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is fg0ai3:ma 2oa4ljclo;/nj- m 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 g j5e9hy5zw cap6;tk 6f+8 scsis 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 induct.u1nkm(crdkl;4sa dp7 v0 tb5 or are connected in series to a battery. The time constant for the circuit represents the time required for thk.c0tr (pvd57;usab4n k 1mlde 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 s; xnlulyk;i3nx4us2f.i9 lg (eries to a battery. The battery is suddenly removed from the circuit. The time constiu gi; 2(unkxy3x lnlfsl 49.;ant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unitnc r1,idc;vklsa*-s/q 1m a c4s 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 tn tox(2kx :u eek0(cb g:lf93 ;osd0rco an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curre6-p moq3d et :.stur2+ia j7wentrt6 po isameu2-dq7:w j3+.t e

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reacta i+6qu9z38cz fou 0b2fkxly/ jnce in an ac circuit changes by what factor when the frequenc 6yf/ofb29 3zl0ju8ix quz+kc y 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 AC voltage aclm-j8ung-o +kk . +hoiross an inductor is doubled, the inductive reacomj+ho+i-gkn.- 8u kltance 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 in j6qx1k mtmv4w ,n)y9pductor approaches zero, the inductive reactance1 64 vpwj)m9,qmxty nk 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 cfd:akfdr bmu-zuk6 5*zu/ z8 .onnected to an AC power supply. In this circuit, the currenf. z:*z d-arbuf5mzk dk 86u/ut

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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 changesfgpbha //0sj- t q)0lr by what factor when the frequency is tripled?jt) -pr/0 lahs/gf q0b

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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 ytv3la; ;(yoa across a capacitor approaches zero, the capacitive reava;t lo a3(y;yctance 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 t++lifh;uq0q1hqr m9 the inductor and capacitor in a Rrq9qh hi++;qu0l1mtfLC 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 RLC circuit is defined -ei( :;vf ajcl3lwxcj+fx-r6g 0 z .uoas $\cos M = R/Z$, 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 cgi69wh wwc/ep6p l 8/aircuit increases if R increases. When is this state9ppl w6//awghweci 68ment 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 increase9 fxyjxyyd8k qim66p 3vx5/b*s 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 6e+bsl 3n3liwik +2 tkyt.m2 *y ik0tfimpedance 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 doubrr6vvu7 g x-+fle in an LRC series circuit, the resonant frequency of tha 6u-+xr vr7fgvt circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC appliec5eumkj :)6 rpm+ahu4 d;q4 jbd 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 occur,jcoig ih loj:o8cv1.0asw5 82)k ast sn*al, s 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 rot0-lta2tvpxf w6i-c f(a 4ij 5bating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne2f4xvt (56 ipl0aibt wac- jf-tic 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 u.cttd mw8 n;g ct hm/d.:y3m*zniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vdz;dn.cty: m8 tmt. *gw3/chm ector 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 rot2p ,r(lsf,bw yating in a uniform magnetic field of 0.20 T. Find the rb2lw s, fp,(ymagnetic flux 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 reducet4o7l d;u2afvd 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 c4 0wfoz m6wy)g, ilp7foil changes 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 20hnu b+/6*n hk;ws1 apoil8yt40 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied pnb hultw o1;8h/ *a+piskyn46 erpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value 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 rdh- jsui3gm6l)* pytvd b4** 15 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 anxjx v33nrmv4:b c//mmd 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 mol b g;1.ugmjt+9-ad m flies horizontally at a location where the downwardm+majg1g ;d olbu9t-. 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 jn36ilii npz.cb(+xu0e) )ig angular velocity of 2.0 rad/s about a vertical axis through one of its ends whileb0 u)3 (nz l+pic.ienii gxj)6 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-secti27uqal( iv.z6ts.3zbia vm ;i u7t3pfonal 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 wi;o8 hju3ry /s3k cpttqhw0c/5re 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 rectangul*p zyt*t)ygmm9mq)z +qop tpx6 j;1*par loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature roytmjt pp)9 qz+ g**p)zxqmmty;o61 p *tates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wiraow*cw blec fzv,w :ng7006x9 e 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 outputdk:h+wxxfotu a0(f+ zm/p ptmn8 5+d5 of 12 V maximum w05 fo+:/tk( mn 8 txd+dmf5pxazp+w huhen rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxwf6 t.;9urx bwm7kk y,imum $emf$ 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 oper *uf-1snzo7nxq 0j1 ri/p5jfu ates 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. Thq-(bamb0m1d4 ny9hgt e motor operates on 120 V AC, and when running at full spe nqdhmag1b(0t-4 9mb yed 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 kk xb,:udn, , 10jlzerb(dyl1to a 24-V power supply. The operating current is 1.0xu nlj b ely,1b1d zk(:d,k0r, 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) , c9uwcm5nxt o,f,pa a 24-V power supply. The operating current is 1.0 A acxoumft,c) ap,95,n w t 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 re5zob5z l 7 f5(ovlkak2sistance 6.0 W is connected to a 24-V power supply. The operatin( 2kv5 5o 5faollkz7bzg 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 u1twl(o nq(h)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 waqaw s zl d8e-tw309fblz495a transformer causes 14 A to flow in the secondary. How many turn 5la4s -8d0 9fz3a tbewq9lzwws 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 ts bv7b kc+;rr.urns are necessary in a 110-V primary if the 24-V secondary has 100;s+vc kb7.r br turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary c.+;ajvh /-huunlxx : uoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in tux+/;: lanhhv uuj x.-he 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 z3mi aktb4x6ui0 2mb3. Assuming 100% efficiency, how many amps at 24 V ambiu 06x3k4b m32ztican 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.hjnd) x)h1crx m9qe q2ft3+j8ad.g/ rle5(tg0 mA. The primary coil operates on 120 V. What does the primary draq5ce 3g t(d/1rx8jfqtmxj2 )ha n e 9lgr)dh.+w?

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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 6tj4 gbe2tmtg no gusvm9((. 060 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied 2e.9v0 tm um4 j(tgn(ots6gg bto 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 30t zm2dv).7z;l a mu:jw0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whatv du2l 7t ;m:wmz.aj)z 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 200 turns. ue ;rhz,)kx( d8elj 4rIf the input current at the primary is 100 A, we can ee rrk)lju zx,h d(;48expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tur-- sqph3q, v xacbcf)(ns. If the input voltage to the primary is 100 V, we can expect the output voltage of t bxps)fq(cq3v,ah- c-he 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 so5, mz u1fob( luvch)(+2vmm fecondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seco) v+5mb f(uhou2 vzofmm,(cl1ndary 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 mw3.b*a, f1f yyc/wvr120 V. The voltage is usually stepped up to 4500 V by a tra.fyym,c 3w f*aw1/rvb nsformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltast- *.ni-8 wt q2tdfzage is usually stepped up to 4500 V by a transformer and transmitted through a power zitaqn.8tf sdw-t * 2-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. Tb8+z. r jk8mybfj *gc+he 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 percentage power lost in the transmission line if thezbjkgy+. *8bcr+ jfm8 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(al.ovi- dgb. long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the 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 ifa o. d.ig(bl-v 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 e99ubs1;wce 0e.ewk xlong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the 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 transfoece90e e.;9wk 1 buswxrmer 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 muchnhh,bbcz61 *ah*j f* h less power would be lost if the power wehz nhf*h61jc **bb,hare 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. 0s cp ocoi) yp-sq:b8gg o68d1 It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tc8 )gc0os -do b1:6yqpps ig8oransformer 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 stored .a2 :.edl+d)m qins mbin the coil's magn.ami. b+): d emlqsd2netic 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 induct -k8ggmdl;-41x /vte5(lqiawu/o csfor. What is this circuit's time ixoq wsv8 e lac4/f;l-(gmg 5/d1t-kuconstant?

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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 rms -f 6/mczk m1o/zqx h:ovoltage 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 place*(tw1 bc 1:hwfe0dpv9cg:z)k a2myr dd into 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 the resistance of the laa)bt dp3m zk1u7 4hpt.mp3a)d. pbtpz m7 t1uk4h?

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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 n.k 9hu6; qlau)yhm 0a120-V ac power supply. What is the peak current throy u;hk6q.90)malnuha ugh 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 powvd f+rvm* c jxc8t.aai8(8vn 3er supply. What is the power dissipat+ *c fxrdj838v8v(citv aam.n ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor7zddv wql i; y;(ul+4yj+r j0f 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 am : ,*eap m5snsh8c0jzu 0(rrq 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistora8 g: ufo op6/oz0ko2ref)r5eg g5 bi2 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 icfb j0-np9y+enductor 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 n u/9q1n/kqxn gov j69reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductg169g o v+mbwwive 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 ry-uo)au r12wa av48jseactance 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 frequency of fkcody ( 01/yv20 kHz is applied to ik1o y dy(c0v/ft?

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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 thyuu )lh63sb +hgyt/q2rough 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 capacitor at 10 kHz?ry)8bjl-(nn n

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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 50ov hk8jxily:5- e kx;y-ca -grbsw063 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 reactance q(u (b36 pueprof 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 toy.2pzaezq8xsk za:+ x,-p9qhe capacitive reactance of a 0.010-mF capacitor be 100 W-2+ z zok pap8,ys qe.xaz9:qx?

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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 ar*htlb +2m vb if,ejt;.7m n.t 0.0010-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 circ9t,ijid7lal (x)r-:qyh lw8w uit with 12.0 W resistance, 15.0 W inductive q7wy9) t8ilj-, xh lla:i(wr dreactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-m8a8* :xdoj ycmH coil, and 1.0-mF capacimadc88jy* :xotor 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* 73xhczoo-.+ luxl na a 100-W resistor, 20-mH coil, and 1.0-mF capacitorxx +lz n-uhc7a o*.lo3 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 ,de- wx keo.43 vlgu:r:5u jpjis connected in series with a 20-mH inductor, what is the i4r u,wd:35 jojlvuk e:g-x.pempedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indukj6w kfb wr*f1d:*dxbm8p. kcky ,.n/ctor, what is the phase a* b,y/rx*pckk kkfw8dj1b d.mn.f 6:wngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF c0l)gfua ;v zbmtr9lopd j0 .5/apacitor for a total impedance of 100 Wt).;ua00bpl o9d5 mjz/l frgv 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 capacitann9thhke01l/gbz b5au(n9 n r0 ces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?b0150agz/hn 9hlb et( n unkr9

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH indh htl hh2/rgp71 f,,md7 opvs8uctor at 5000 Hz for a tota12hfo8 gvhp rh,t d/s7p 7hml,l impedance 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-kotzln e0 )i euyxkz0n962 ;x;bwu:(ei W resistor at 1.0-MHz for a total impedance of 15; ;w e(6o0n9k teuzi2xnxlu0iz b)ey:0 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacit (7:qk xbp;r ;rougg0dor. What is the impedbrg0dkg; x:u(o7qpr;ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for85anj n;pd k86uto8zh a total im8k6 d8a5 zu h;jp8onntpedance 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/ev3mwigfn-bmz*4 1n 10-mF capacitor at 1.0 kHz for a phase angle w mf-n/vz*me14g3i bn 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 rdv;+p943b(p8 i aqxjyag hz,desistor at 1.0 kHz for a total i38a;(pa4xzd, pbgdjq +9v yhimpedance 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. What is f5tmx;4ku9/u evb+rw the phase bxre;kf 9/t4umv5+ wuangle?

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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 resist:0k ; aify6r;ke4f furi1i:hvor, 20-mH coil, and 1.0-mF capacitor are connected in serie:r1 fy vf:auki;i0f ir;k4h6es?

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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 resistotrq5/ ,h;/cxhu wafxira- i21 r, a 10.0-mF capacitor, and a 0.350-H 5ai1f- xx,rhwr;/ait u2chq / inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an indufq1 gsskc)kw +a/gu. 9ctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power/s 1s9).qgk+ ckwfuga 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 xl kl+k- x9u;e521pb2 tmu nsrRLC circuit containing a 50-W resistor, a 10-mF capacitolp;e- 2 kx5tn9xulkb1 ur2 sm+r, 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 necess bk60m8p.8z u4v cvmorg9vd 3iary in series with a 500-W resistor for a phase angle of 8bumcp30g86rd. kv vo4vim9 z$40^{\circ}$ 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 circuit2u 3 mk9njlp, bus.2db has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the ci u2 bpku2 n9jmsdl3.,brcuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W1qmau 8imz.y45-y b*can l k*+xa n5pg resistance, 15.0 W inductive reactance, and 10.0 W capacitiveyci.uln 4 5a py 8gqbam1m 5*nz*a+kx- 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 aibue.n(fk- p )9vesq 0n 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 resistantg g(ef(c cflmxni3la55c0*7ce of 30 W. What is the power fact3 (fxtif 0gn7ec5agm(c*cl l5or?

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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 ch; 1s/hl hda q95kl7h6vb+wkrj3 ,zqzontaining a 50-W resistor, a 10-mF capacitoh + hh36r/bvq1sz9lwz5qadj7 h;,klk r, 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 10tr;3 j mat.cm5-mH coil in series?tjmcr3m a0 t;.

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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 re8a pb u .p9u2n*cj;jdnsonant frequency of 1upj;j2bc* 8nad pnu9 .0 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series wif*mli-7)jkq g8 sf 4i;f2tipa 0fh w4yth a 3.7-mH inductor for a resonant frequency of 1000 Hfgfm fl;i4yf-*k)ht08 4i2wjs qip 7az?

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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 p/q( 1hab/tb:-vhd y )ywobg6r laced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the d y)t16/hwv/ag:qb r hyb(-o bcircuit is to be 1000 Hz?

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