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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 magnetic flux excepx n9bar-7bpd 0t

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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 states62 syp w fr/cpe )p;ir51uabq3 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 loops of wire in a coil produces what kind of g3lj5 cdh;xmxs)m 4va y(p1w0change on the4y5 pxmdgm3v ;0jl a) 1w(cshx 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 of wire produces whaz ob,6 j)m qo/cyi)jg9t kind of cha/ mojobjy)zi96)q, gc nge 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 progt)/gr/l/ opn5vg mye0 s8:dqduces what kind of change on the indungy/mg5d 0)st8//lv p:g qreoced $emf$, 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 maeqg;, cl:h*d wgnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor wd0:(fqyk;:u.ruao rwill be aq(rr0;kuuy:d f.w: othat which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bd2oz,- mpo ;1(e(auldnwj 7ouar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abo zw 2d7uoep;d(-l,1nooj (um ave)

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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 xw* ,2.- cw0 mpybqvadbueog8 1 .;)3nyibammis held above its 0 1m2be u.-d8*xiq)ymnwpc .a3,yom;gbv awb center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region wherep9i)j l qvhmnkewd9wxw:,0/ 8 the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from abovew wl99vp :d)kqnmji8 xw ,/0he, 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 where the magnetic field 4yg9-u yjup pc sduy// 0mf+c5vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what i9 uc+j yduyu gmp4p s//ycf05-s 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 region where the magnetic field-:z 3+zx:s0ff t.wzxsfsg8bl ; xvxt0 points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disapp.;f :-b xfxszgs z3wzs:8t0+0tv xf xlears?

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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 tabv5 kn *x 3 94oymzd)+vlv)hiwmle and carries an ever-increasing curren wvliz *d3hyxm )nov+4kvm5)9t northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. Aalt -9w)bhr8es the north pole enters the wire, the induced curr w98lbate-)hr ent 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 c /ipdus1k6hp* onstant 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 orientation of the loop's axis/1 *udk6piph s 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 consb64k6nsd+/ ydsy* au atant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field pointsbs /kdad46sny*y 6u +a 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.rw n jdurq+yot7t1o- iv89;b;
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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 tgypx (u76 7vy 3woitt-hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.( uigsq4 q7td+ The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northby7ak 14gouwjyp*7d 0 ward at constant velocity through a magnetic field that points straight down. Make1 g0 b4 yjuodkap*7yw7 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 rotats) t 9fycb5x7n3kd .wpes at 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 transfo 6/jrum clom/(rms

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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 6-yvc f4p 7 xog1av;5rn0 revolutions each second. The frequency of the54gnfv v y7 r;p1aco-x $emf$ 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 deviclk .4f/s4)fd .pk2d,j tnkexte used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de1y6z f c;.)if.n aa cq)ebkl-gvice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than tg) ntei-3a4dx;gmw rd pp (i2;he primary coil then it i ;-g ; xap4edi2n)(p3rm dtgwis 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 cbhvs-6ezsp yaf9l)1 : oil th p1- 9bavhz s6e):flsyen 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 inp)7ba zzzjldnp w 4ly7-bvd9c2771ts e ut

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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: zwimju0 j.n9 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 inductor7k icc6rz,k-:e- f sxr*si:zl are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the volrez6- r:c:z s,sxi-7ci k kf*ltage 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 cons/u.fekb.ie-k +ovk- /y6gc p9v p wh.rtant terminal voltage. At the moment contact is made with the battery, thue/r p..6h w/+be9p-kk.k gv-i yfvoce 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 inez b(f+of3 m02eiul, vductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an ryoh* .( tmrang fd4d7(i3jm: $emf$. 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 batterkqmu3 ju929 lcy. The time constant for the circuit represents the time requiredl93mj 2uuq9ck 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 b );i (aytzd)nnattery. The battery is sudd;n(z)dait ny )enly removed from the circuit. The time constant 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 haejk0 :db0z4hqdt y-;dve 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 AC power supply. On this* ipasqmi/6+ *ilflf y08.gcuhz:v (c 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/ b 8c8x)aduz/ck9dg1 zhcy0 n circuit, the curren8y /bu0kz9d8n c ahgcc1 /dz)xt

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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 d7hh j4 j,wbr,-lc e+oac circuit changes by what factor when the frequency is w,rh-jd47b, o+hl c ejtripled?

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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+0m/ qe*h smkq4y. sm8qsf c4k AC voltage across an inductor is doubled, the inductive reacta*+m/4mq8k.m qksy ces4qf h 0snce 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 induct +2tn c8hcozodrxnpq( *a:1 6eor approaches zero, the inductive re6qoc*1z8eoh n a t+dp xcn2(:ractance 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(f9xlzugc 3+z power supply. In this circuit, the currentl3xg zu(c 9+zf

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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 ki2j.w6u2av)ko:)s )kl ommbgi2g+g factor when the frequenimu6s )2kgo gi2go vb:)lkj.2)aw+mkcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across -k2k psonkpw.6 z s:( ra0kej+a capacitor approaches zero, the capacitive reaekk (j.2opr s +kzs-n6w0k:pactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and yy2+z-* egu 1 o;ujutdcapacitor in a RLC series1; *ugtuouy -de+2zjy 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 /x kc4vspr wq84 gi(0 o71zdctcircuit 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 increases if R increases; 1n :gszodov*3v.gtq . When is this st v:donq vsz*;13g.t ogatement 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 impedan7lu5autj *o ibi.vn 0:ce 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 circx io2dmrr9 m-oxr,0 rb 2.soxrvd17x(uit 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 circuiti h6nu9s )cwqpxv5-u/tn a)bs/;o)a a , the resonant frequency of that cir)t9an/u5aups h6)xqv /w-in) b;scaocuit 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 thapl tp/ilcaj79bg l ej u4q0x *)-o 0v+xy1r,ptt is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a seriesm0u3iq0yrwbp wji nvc *- c/+) RLC 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 mg9g6,xi )csy zagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field gy6 x)csg,i9zvector 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 1c2kxe9g sdb+r-3kq a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectsc-edb9aqx2g 3r+ 1kkor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneti z kg6zg wjz960tro1m5.,t tcpc field of 0.20 T. Find the magnetic flux through the loop when the plane oz5j o1g 0c.t ktw6rtm g6z,p9zf 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 adjustablemfqh+ta:, g fu*g s6jm9x )qa;p6q* xa single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from o wb -nv*p h w99uauyqg. ldeds6-.0l,wx 7hb5$4.0 \times 10^{-5} \; Wb$ 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 bwtt) 7,ho-i9r0efut square frame with sides 18 cm. A uniform magnetic field is applied perp u7 t9et0)obfw-r ,hitendicular 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 15 turns and an areauhj5w m vi ..qewkg7u (7d0fk2 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 ar q8ls2 hxf-/um(*7mrz *pvcil ea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a lo sdblw/e9krl u1*9a1hw1 c*cp cation where the downward component of tc1*lp* l 1/dcw9e1asurbkh 9 whe 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 2.0z kfda et*,-setv(ma*,y kjn3*-y 1ng m long rotates at a constant angular velocity nd-(*kk , ynz -sva*fea*m tj 13ye,tgof 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 505y fnzw)1:yroe 0ik:l loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consistov vk+ov0h,z.s 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 $emf$.

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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 lolhii:y hi1h271;tig db 4xb )kops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which 21g kh )4i:itb1;7h dh lxybiiis 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 arr) wnmc)hc d89ea $0.090 \; m^{2}$ 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 rn7kq (*knmm7output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avail7*rnkmnq 7 mk(able. 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 r*:kud8kfv 17 z/v4c.ufzedn 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 motorq+ hmifweq+ z2( :w3cl 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 motzur1qkm 9)t l ;/hn0dror operates on 120 V AC, and when runnin)/;0rkqtd lh1rzmu 9 ng 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 resistance 6.0 W is connected to a 24-V power supply.hphd j(5+e (mx The operating e(5hhp+xmj d( current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co. w)stst5jq jzf6:e6iwf+f (soyw d15nnected to a 24-V power supply. The operating current is 1.0 A at fully 1s(js)ij6 5+t5w s: w oqwzffefd.t6 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 resist x/vf:2u b -3utdf 2s,b(mm bc7rbk1gsance 6.0 W is connected to a 24-V power supply. The operatinsktr(m2 mg b 3vb ufcbb-2,7uxsd1/f:g 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 needed3j;j6o.hf -/v6 xa zq dcknmq -;;dxwq 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 ca 9 zbwtl95pb+wuses 14 A to flow in the secondary. How maww9lp5+b tzb9ny turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns*jp6lri7 a0:khoy ye;x myh-9 are necessary in a 110-V primary if the 24-V secondary has 100 turnsihe6lxm; :p9h y j0 7oyk-ray*?

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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 coilm;dxi- *hbm (3wr +o41e4tu1ik ugqg l and a 2000-turn secondary coil. If the e;i k h m qx +u*-m4o1grbulg1d(3wt4icurrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumpneh0u z .0ze-ing 100% efficiency, how many amps at 24 V .-0pez0ehu zn 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 neonn2ylg56uyv8 y sign transformer provides 7500 V at 10.0 mA. The py5vyu6g nl y82rimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prb/x6pb5 3m5 ccfe /)unuc g6urimary coil and 300 turns on its secondary coil. If 120 V at/5ump3/cgc ucxef6rb6 u n)b 5 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turnsbtv),uegf8 dnc 3,3lu on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present 8ldu cefun g33 ,t,b)vin 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 205l+cb6v4qxqfrp8a * ulx fa1 -f:2n bn0 turns. If the input current at the primary is 100 A, we can expect the output current a:5ulc *b-rf a8n1x b nvfpq2x4 +f6qlat 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 secondar/6f hl; ob:h unux7ii.y has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondbii7:;nx/6 .uo l fuhhary 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 tuh2zuuk0c,b 6g rns and its secondary has 200 turns. If the power input to the primary is 100 W, we cah20u b,6ukgzc n 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. T00b xj n13*xf pd*u9jd(jz*fn o0m mnthe 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 secondarz3*mdjtxu0fj * dx0bpm 9nn*n1oj (0 fy 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 usually sterwq/j72 fqxo1: ymx27tn9 pbz pped up to 4500 V by a transformer and transmitted thro rf77z2xwn/ o pjyx 91qtb:2mqugh 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 1a 1no uyz5 e+86 rn1ivbixy+p120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage15p1 6zu18von+beiny y+ra ix power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.qqa -q-)c;5ios0f9sa uqocw460 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 109c 5i;couawf-o 4)q0a s s-qqq0:1. 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 0s vctgf-e, 2zb,eq 42c.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tra,fq -g bcsv2 e,cz24tensmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less ps ,,yov q0bq sk+8vs+jower would be lost if the power were transmitted at 3000 vqqj,s8, ssb +v+k 0oyV instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted w)r me-dk n75von a line with resistance of 0.60 W. To what voltage 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 power5 k de)wv7rn-m?

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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 ) z m+j/oqb:w*s/ gqkimuch energy is stored in the coil's magnet/zb/os qwm+kqij:)*g ic 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 resiskg/yu- g)(v1syk m6h pawv6ukc .5+zvtor and an 18-H inductor. What is this circuit's time consuc /gv(k6 u 5sygv+6z1pwky.)hakv -mtant?

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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 wherea5xaxti v.-+t the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC out,i6kug+fe9 ck let. 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 ijb i 8ze-5tj q+gc,xtza3n(*is the resistance of the lamp583b(q t- ejxi,ia tz*cnj+gz?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply z/lkdm(r h3z1mcv v/5. What is the peak current through the r (m/31vkhzzldc vm r5/esistor?

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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 the powe+s yaa-e q7td0r dissipated in the7 qd0+yasat e- 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 syuoc;h.-, kri;uf) o 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 raeki,m ,5s6/s l/btgz,1qcr wesistor 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.mng0 tqm, wh3-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor adj5rm1.x(zxz4ef(9hz 2qc kbt 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 reactance of a 2.50-mH coil at 1k yy -886qx jb()qijof000 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 inductive reactani/f07od;4-tw d fmyw a.s:h wbce?

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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 inductv+a4q/4 d yzerive 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 w*oivb0 w 73efg z eq6(3ev38zbjg7vuohen 120 V AC at a frequency of 20 kHz is applied *f 8j( bgeo33 i7gbewv zv7e uv3zq0o6to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil djb: 31tx4hba mfualv-z4.; n oue 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 capacitivz* l3/klxm3hbsz ;s(je reactance of a 4.7-mF 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 is needed to have 50 W of capacitive reactance at 10 kHmab of hci4lm6.1n) 4ez?

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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 hz q l(ztxk5j-(ave a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 W-.zg q k1uiu-qr-t2mgwj3 o e5n) )xlsqkwlgx r j ie 2-mz5t-u)1 3u)snq-g.o?

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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 throvq q .yh1ro.5mugh a 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 circuit with 12.0 i.k+d4i 0mfem W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan+ 0. efkiim4dmce?

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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 res -o,v ew-x6j/wx3jh tcistor, 20-mH coil, and 1.0-mF capacitor are connected in serieovt,w-6xc 3/xw jh ej-s?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.s3m ece **.i*kk/*j/bmkov wu0-mF capacitor are connecte.o*jci sev/be3*uk w m* k/m*kd 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 inductor, bwj1a n+*rqf3what is the impedance3f*+n wrb 1qja 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 inductor, what ul;w 5owgi-h* is the phase a-*ghwi wo5 lu;ngle 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 circup9xndgi: ::xj8 u1+o h2:jcc:oila vvit with a 20-mH coil and 1.0-mF capacitor for a total impedance cvgi18puoj :9x+hn id:::v:ax cjlo 2of 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 se g kkh:;ps7(/jbfnk, kries with a 100-W resistor and 15-mH coil to get a :g,( hjfp nk/;bk7ks ktotal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH +7bsbju-8r; /+ s*y hnnp sw3dhg*x aginductor at 5000 Hz for a total impeda-8s wg/n**+n + dyshsjx7p3hrbb g;aunce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW rem-0 soy5ik+ (pgrk;(h 8wpj iqsistor at 1.0-MHz for a total impedanc p(8 s 0(;okhiqg5k m+rypijw-e of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the imhsh f l3;jtg2c 5nn*k/pedance at 10c 2 /5;nhlnts3khjf g*00 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 neqft9l 94ik)at2y2fyj eded in series with a 10-mF capacitor at 1.0 kHz for a total impedaj2f lyt9yk ti)29a4q fnce 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+ zb0)usi) tksv(bspv z6 (zg;se angle of tgv+ik;s()zub ps)6vb z0 z(s$40^{\circ}$?

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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 tota9vokzf e75,le r5c+9x+o w hx4q:aokgl impedance of 45aze: 4+ kf xoqol5,k9cv ho+wg75erx9 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 s dn 33xri,mi(keries with a 100-mF capacitor at 120 Hz. What is the phase andx3m ir(ink3,gle?

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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 resistor, 20-mH coil, axwz*:cb7q a+(:f jvvand 1.0-mF capacitor are connecaxv(+q7wb*: a jz:fc vted 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, a4i5j(w e4 ifa yz 9n2lt iq-k;dr+trw7nd a 0.350- iz ryl(t;kjafr4i72q+diw wt9n 5e4 -H 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 capaclohn 5uh163c mitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in nl5h ohm63 cu1this 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/vxoe1h(9tf. yafl k35*hrb k series RLC circuit containing a 50-W resistor, a 11hkv/exal(.hyktrof39f b *50-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series qaj,7*3g 47sfo( hbnk ln5ut w4+/s eh.r fztbwith a 500-W resistor for a phase angle o 7.zbhfls ,t 4 abnjs+qrgthe5fon4*wk7 u(3/ f $40^{\circ}$ 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-d t1woh1rear0 o;0q,pkt8pu = 200-mH, C = 10.0 mF. At what frequency should the ci reta p; dok ,1wro1u-8p0qht0rcuit 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 .wg)u.re cq)b circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when th e)q)..brgu wce 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 a*sezakg :3, ann 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 anb.3 ej:bp qil(d a resistance of 30 W. What is the power .qelj (3 pbbi: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 op t*p-idc*ir)9 ib3p4x15xh qbd+rp ri2; ydRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne9 x2rhdp x* d-)5 io43+pb*c iqdbirrityp;1p cted 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-mH coil . 6ydy 8l; 3u)lynes7v2(juftf jyj9kin series? un.29yd)evfluy(l k 8 fsyj7y6 ;jj3t

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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 res6keg8 1x.3cg+ ojp bnxo *st;gonant frequency of 10 k+ 8gt.*xjgcobsx16;ke 3pogn Hz?

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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 3.7:86 to):hndmvvoog n,uel8 b4y j6t7n-mH inductor for a resonant frequency of 1000 Hz?uleon7 :8)oyn v 4mv86o,hnjt t6d:b g

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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 ressuhq2e 6r q53h+qr p* 9jativ9istor and a 40-mH coil if the resonant frequency of 9r3 a hqq6he 2v59qjprsitu+*the circuit is to be 1000 Hz?

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