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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 units of magneti.prtb,; 07d*adcn .*j :tomqgpq +vi zc 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 indi3v+z85q 8 m f4ubsmero25skbuction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of lokg0 thh(pc g)-vj5uoumt (7/mops of wire in a coil produces what kind of change on the induced 5t hk-7t( gj0vcuhu/p)m( gmo$emf$, 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 thr3 ev fb6u*yjz*ough a loop of wire produces what ki*uvy6 fj3*bz end 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 produces what kind of chsh3d c.6 nzmv4ogo) e+v(:l haange on the indu6 ds:vc+v4zge)o. (lhnhoa m3ced $emf$, 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 field an / 0bqx nf*68vf o4pyxn$emf$ 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 d n ;:0alofse)iirection of an induced current in a conductor will be that which tends to produce which of the followf0eon)lis; a :ing 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 acl/7tc.d4 , m cvt0lmz horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from above)m/0d4vct .cm ,l7t zcl

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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 hor2v2ia zuev /9dizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fa2ui dzvve/2 9alling 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 wh8/6pyps;tl kgere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is l/s8pp6tyg k ;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 where the magnetic field vujwv5)1 -2qkp sheb+c57 nixpector points straight up. The magnetic field suddenly grows stronger. W iu)nj v7xe qp-+b 2pskh155wchen viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a +pqa pli7pzztk, ,-a8cftr j - 9*2ecbregion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directi-p p tlzr+-peqt29a ,iz7 *ccj8a b,fkon of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-incrfq5v uapt(f 24-aek:peasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewe4p(tpaff ka-5: v2uqed 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 th tl(2r. r:+,o*ws25bksu0dzlr nlda b rough a loop of wire with the north pole entering first. As the north pole enters 5r (0utz swsd *d.:kl2rn2+r,loblbathe wire, 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 const9t0g*6qvuaxn veqp -- ant angular speed about an axis whose direction can be varied. In a region where g- v*xpqna6q-0vetu9a 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 rotatedf ro6f mm:p1vq8atp1- at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientationrf: mvaq8pf p6t-om11 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.e oaltnm2ek/dxu1+ iw +,k)8 c
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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 anvf kcco0mm3 yej ,bxc046(/d t $emf$ 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. They8 *bts*dd/x b $emf$ 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 (oriea7 nw w.v:b2,n.fi7ql ti/anonted in the east-west direction) is moved northward at constant velocity through a magnetic fiewnn b7na/.q . 7i2tilo,fawv:ld 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 aau3 i*htc5z4hrf/ ;,d p9czq 0e1uhkq t a 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 transfsa. kn 4tcr+g;+eah 1horms

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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 -f 6g6)*0g ksr+j4cst0uz:ektaof a +u ogav.revolutions each second. The frequency of the + jsg6ta vozof g .k cta)uu+g*:-a6r4f00 ske$emf$ 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 usedd/hhqn d+/y) , cpysgk.5 ckfi.j s)n+ 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 tqca2ee1ycb ,snkp *)b yr7/y/hat

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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 primaryf6.lyhiq;;3bm xbx 47d+rorh coil the 7r+hr3 xi4 hdfqx6 l;;mbybo.n it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the j5 k)tv)chvs 3secondary coil the5v3 stcv hkj))n 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 power inpdi,(.x ge ,llnut

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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 jw y6egta *(r: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 inv)im q)d f vg75lxm7f6 nf rda48tsw6*ductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the l6fw846 n)t rmaf7 x d* vfgsi75dqv)mbattery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of const, wyhva)4grgx 2o. oj8ant terminal vo8 2vg waho,4gy.j)ox rltage. 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 w ) m8/zjvuqlv +men z2q2;l*zand resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with in b( .:xnb8l.qd+xtz5r 2)qbeicfwd,24 u kthhductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 to6o qhwr3lh:v2 n7gv6k5bs f*n a battery. The time constant for the circuit represents the time requiregbqn:vhn 66*khv2l5r37so fw d for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery avk*nosm2a)dmet ;91zh +p +s. The battery is suddenly removed from the circuit. The time constant for of 2+t)ke po+m;nma1 hzv9ss*d athe 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 2uo*o u+gyakmm25+iq4sf /kohave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an iay jwi72p6 :m hajn(0,ca6ci 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 c/fg:5l7 g rg 1jryyfv3urrent v17rg3yg rg f:flj/5y

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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 circuih. qkii z.)8kct changes by what factor when the frequency is trih kc qi.ki8).zpled?

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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 /lbg 8q8g9 c :pto-actinductor is doubled, the inductive reactance ofcgob89ct - :g/pa8qt l 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, the ido6 ed7nx;i 8ib dae7)nductive reaa 6o exedd);7bndi8i7 ctance 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 hxyebj-pxde8*r2c j:k /)*ho 8ms am0 power supply. In this circuit, the curre2-eb/ m:rxm8*h*8 oc sy0)jjhap dkex 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 ayhsg(z( h8zw* 7mw 0 h;is,zeun ac circuit changes by what factor when the frequency is triplz,( gs7;0h(*uywsm zi 8e hzwhed?

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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 thz8 ttqu d:p-9ej71djj h,fe1fe AC voltage across a capacitor approaches zero, the capacitive reactance of that c-9dtt1u7,p hee f j:z81dq fjjapacitor

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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 igf -s:sbhv(p 1nductor and capacitor in a RLC series circuitf- 1gb:ssp(v h?

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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 pu/ su.z;2du0 zqq0bean RLC 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 impedance of the circuit incre.wx;/x )v mt+h ;jmlwjases if R increases. When is this statemenw x;vlm/w)j ;thj+m .xt 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 increases if nsoc91e4 .ompv. 4mlnhr;li / $X_L$ 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 circ )v2ds7y4u xdnf.cg y:uit. The impedance 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 cid/65 tvsk6 i3ya gcciu28d6n yrcuit, the resonant frequency ou/vn3t6 58c6k id2a6g yyid csf that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an A pau8+phyn(hqvrcu,zq/ mq7 /a zmb; 5h3th92 C 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 RLi hp.f /hw,2jhC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magvhp dk es)l2.)netic field of 0.20 T. Find the magnetic flux through the lp) skvh .d2le)oop 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 7 t0 xsarmkj5x9dh/z:rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of a9tmx zx:s/50d7rh j kthe loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uni2z jn*9qnfic1 form magnetic field of 0.20 T. Find the magnetic flux t9 njz*q fc2in1hrough 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 froeknrx:o+ + pk;vw57aomj y0+r r5b:c*+gos som $1.0 \; m^{2}$ 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 change v28rvoa*bsb ) +z cpn xb1pt6y;exi+/s 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 wie 9jhh2 ,6ottpre on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find tt92jtoh,ph6e he 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 64d yno+kh 5zlnmyg4k 2e h4x)with 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 and arnh cxv,7fhaci.ku4 /6nhpcm2+y ) m5 b)im-bkea $0.20 \; m^{2}$ 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 wy9w zc) 0*vtgat a location where the downward component of the Earth's magnetizwy)v9*gct w 0c 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 b gggcq)k5l f-6ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertica6glgf ck -g)q5l 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 anpch 8f p8-fdie 0/*+l wzesd5od a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of 3w c zo2 - .mn2 oq8w157sy7fzgkbmdyfwire 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 ar )ut;ux+pfhq3p xi */xmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an px+)x*f 3qi/; tuhpux axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a;2 vggj0nbwr/rea $0.090 \; m^{2}$ 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 tot+p nkh:y u00e construct a simple AC generator with an output of 12 V mkuy0 0n+:hpe taximum when 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 ma67-x(mq boda oximum $emf$ 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 x+ *oatp.crgsqgwd:)+- fs,e 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The rak x*ko0yjwet*u/)2+c9m0pxo7uqp motor operates on 120 V AC, and when runningp mjre*9*y2o0ak+w x u)o tq 0c/k7upx at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal r*vuw8jhgk xjtckd.9.) i(uf 9esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cur9uickuk h.vdwx. ) 9gj8j(tf*rent?

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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 ifnt-i-e uq5ky374bfduw t6r )s connected to a 24-V power supply. The operating current is 746f-wkunu5-e tr ybti 3)qfd1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W i8ia mbh8nj 4i:s connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is th n8iai8jb :m4he 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 needef4p rykfe90 5p8t-lsj d 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 causes 14 A to j1vrw *d*x(juflow in the secondary. How many turns are in th*rdu(wjvx1*j e 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 11 glr0d:ca9j 8r0-V primary if the 24-V secondaryrg9djc8 al0r : has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-r j2mg5pa kq+-turn secondary coil. If the current in the secondary is 3.0 A, what is tq52+gma-pkr j he 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 thrkf/ysr, wtnf3y e/()o/eay)+g*4eilqnp 8n e primary of a transformer. Assuming 100% efficiency, how mane+ 3e)e(ry n4asn /trg/p oy ,w/y8lnfk)fq*iy amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 1nuv pilcb+43vf329kfm, gl9e0.0 mA. The primary coil operates on 120 V. What does the p2ev9m9i ,cgun3l43vfpkbl+f rimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seco,ze br(d2rj f:ndary coil. If 120 V at 2,j 2 errzdb:(f.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 turn;i4c702 tidhj* gaop qs on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in 7 hidaogt0cqi42p;j *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 transf 8dre;7r6dzw egqwq7 5ormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at tw7;6q5zq eewdd7rr g 8he 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 20sx9zula l5t430 turns. If the input voltage to 43s lt uzxa59lthe primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformegq o g1rcd;6ybn.r*x*r has 100 turns and its secondary has 200 turns. If the power input to the primary*gd ;*yq 6ongr xrcb1. is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thqb qr0. 3hl 9j8tiq/sknga 41he voltage is usually stepped up to 4q aih 8h9 tg4bsr/.0 j3qklnq1500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuall ki)0hasrb( l3y stepped up to 4500 V by a transformer and transmitted through a power line ok)sl0 i3 rh(baf 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. The vol6z:x uhwww 5-.cebf3 mtage is usually stepped up to 4500 V by a transformee5z3bw: mfw.-w uh6cxr and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a m: c ;kqt nqjhvfphyil +2uq:t1f51.8p45iywtotal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss p yf14ftky:c;v 1m :h iwt+.q8ul5q2 jpi5hqndue 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 total resistance of 0. xuufe7f0n6dqr fi.q+ sao7+z bio639 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 7+urx u.09qe6a foz do+sniff6ib37qof 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 109vxrg,1s+ xhykwxpi0;+af*f 00 V. How much less power would be lost if the power were transmitted at 30000*ih ;,xsk1y9 vxfrpxfg+wa + V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transwhzgp/t+47mv mitted on a line with resistance of 0.60 W. To what voltage must t + wz4p7/vtghmhe 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:e13 l75bu)t-e lj f cezghh1dr a/t9w 5.0 A. How much energy is stored in the coil's magnetic f-/ea: 9j chz)11hlb7 dlf3w5egeut trield?

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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 induckldmt:5 8 zy )fd) 0uxwvx+o/qtor. What is this circuio/xq f) x+wt)58l vuydm:z0kdt'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 adz/4wg7ga;a circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120l3gcsn05u mc7-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 re1g/mw8ofbl1l sistance of the lamp8gf wb/ll1 1mo?

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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 at-lph zq(. ,p0,vwxaic power supply. What is the peak current through the(.x p,q-,iwtlpza h 0v 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-Vn5sihw t3 gp4 q+0k(df ac power supply. What is the power dissipated in theh(sk5 4wq +3gtdp n0fi 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 an6lr:b7n9ddgm8c-d s 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistoz9y+ fg 4 pn,(hx1oxtyr 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 re+ n.87ee7hudoaty6ossistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hwqa i eqzz,5l3m 778zrx4uvb0z?

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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 reactance xbjlb5z(ty *4of 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 have2dn 8zc 8i-vh lhc+3jo 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 m9 nmspx0 (-3cv/ dxdyj+/foh of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 1xrqzc87 6 z4sn 8os4ei20 V AC at a frequency of 20 kHz is applied t4q seo647xzrs8nc8 zio 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 cop+k:7vy7(b nuxur*xk,e )b rnil 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 10u;ymhf, i 7t4pabtv ;5 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 0:wwpsz*19nw3zzy lz is 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 r5yt1em ii2 2jr)sgws/ eactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacrgjcyjptn0iv4( 7k,x ; *ac4 litor be 100 W? j;4cki 7c(y*g0v,np ar ljx4t

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor aqehdgpq; a9zy5j 4s wb6n*g+ 8t 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 circuir8 yhtpl9 -ie6t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitii98r le-yhp6tve 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 res9c0k n9 )kpo d9tcb;uhez-q+pistor, 20-mH coil, and 1.0-mF capacitor are connecou; tcpk9+9 qep)d zb09khc-nted 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 100oc jro1(xh: zmui/nnicpg l5l v4*fk .j((+6r-W resistor, 20-mH coil, and 1.0-mF capacitor a4+((iium hvc6 jl.kop/ xg rjof:( lcnn5r*1zre 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 in series with a 20-mH inducto7t uho:5u41x(xibf: nxxfz8sr, what is the impedance at 100s x7ufx5x(t 18::u4obnix fh z0 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 7 vl 8k,lc /dwv2b9eese;jg)d-mH inductor, what is the phase angle at c ) d;l, evjw/ 8legb729skevd1000 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 2 )c+al sb+zjccoil and 1.0-mF capacitor for a total impedance of 1+bzc2als +)cj00 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W res hq10gq1 +qe agh*pu*pistor and 15-mH coil to get a total impedance ofq+h0a* pg u1h1eq*pg q 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-mH inductor at 5000 Hz for 9 u/j+rdbpjc+je02d kd8xs, c a total impedance of 40000 d8 x+j+jc9 bdse2 ,rj/ pcuk0dW?

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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 resistor at 1.0-MHz f v6pgts751l kkor a total impedance of 150 kt pl15 7sg6kkvW?

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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 ser6h c ,lclu,z+j4s mst1ies with a 20-mF capacitor. What is the impedance at 16ul,zs+41 cmsjlt , ch000 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 serieh 7tmj o+.ur nq143vjls with a 10-mF capacitor at 1.0 kHz for a tota jvqto4hjm +1ur n37.ll impedance 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 for a pha x.hoaj l(o9 he;68jhcse angle of xe69h 8c.o l(joahjh;$40^{\circ}$?

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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 )nkrz xlp81 7ifor a total im )rnx87 likzp1pedance 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 se:lzgoiht.;xm+ mo -5 ybv 0l)eries with a 100-mF capacitor at 120 Hz. What is the phase gx le;)hl5v0: otmiz+ -.obmy angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 15jd6wfa/slux:i 86 tz v)cm+9d00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectevad:6 lt+wsj/m9cix f 8z)6dud in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 05camir7(/s r4lz6hp v .350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in ther mzr654s(iav/cph7 l 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/.yszjh k:*drdc *i,c an inductor of inductive reactance 30 W are connected in,z dji* :/*s .ykchdrc 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 circuit containing a 50-W ree),x0 ywj 1zdcsistor, a 10-mF capac1zc jdy),wx e0itor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in s/y ms4bp+ypec b-;k v55oj 4eberies with a 500-W resistor for a phase angle ocpe/-+mbo4b b 5 p4yvkej;y5sf $40^{\circ}$ 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 -r sow4d)q/f3v tfp00 tzkhg wh 2+5sn= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fromh3td-ksr4 vz0n 2 gp+ /hw o0)tsfqwf5 the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance hwrww41gf6p/, 15.0 W inductive reactancw4 6/fhg1r pwwe, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isx1q1/ x b*rlmnhk kefzi6ir 6a6l; h58 $63^{\circ}$. 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 impe3j3so hehr8 r)dance of 60 W and a resistance of 30 W. What is the powerh 8j3)s ehor3r 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 a 50-W res p8e.2oi fn-hhistor, a 10-mF capacitor, and a 0.45-H inducton-8h .hoip fe2r, 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 capa,gmtl/f bqadt-rr guy;:-6v4citor and a 15-mH coil in series?tguqlgar:bf m4d/ ;v ,t-y- r6

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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 inp.d50mh2z b-g jl ,lm; kr1auk series with a 4.7-mF capacitor for a resonant frequency of p2gkl1 a0.,m;5 ulr bhjzdm-k 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in seqmoah )o8 fw9ks-j5 14wtk5auries with a 3.7-mH inductor for a resonant frequency 55f4mww) 1k-atq o kso89hjauof 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 seriespcqjk 7nr-o3bb6yw*8 with a 30-W resistor and a 40-mH coil if the r8n oyrpkb c-6wb7*jq3esonant frequency of the circuit is to be 1000 Hz?

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本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师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
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