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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 mag5. .zvmsw i9vd fb0md5netic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the y h tf/0hw+;um$emf$ 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 produc* uqv1h0)ruk q 5q x z6vore:a1mtw)c1es what kind of change on the induced 1m)hkwt vqa*qe)5crqu1 z0 vox ur:61 $emf$, 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 throu:rk/ dchih1 i(dt7/ hs jmwl59gh a loop of wire produces what kind oh hc79(m/irw tj1h:/ ddlk5is f 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 changhgy*p8uv+4,1 qi gxfje on the induced h1vu8y j+f, p*xq gig4$emf$, 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(mqywl +cwi :oke8 -q8 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 conxiuqabz-(d m:0 a6 9leductor will be that which tends ( iz lda 6qmxua:-09ebto 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 nv5.jr 0ityne2 a6;sx.jm -agon a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet inducesi0.xg. r njna;ym2 -tj 6v5aes (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 horizontal t8i+:z)f dfk ei xqio(de; cqpr0 9r(him/g5i4able. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, theriqpze:cff ((4hqidk9;5 mi + i)xeo0rd 8 i/g 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 rem8o5cn4b5 g66wifl lb gion where the magnetic field vector points straight up. Tolbw8g n6 mlb 5cf56i4he magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region pf4akkec+ t /pn2zr 6(where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, wh t(cp+ p/zkf42k6re naat 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 todmb*-zq k0b8 tp in a region where the magnetic field points straight down. *-8dzkqb bt m0 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 tabl , ;94mfhm 2o;6yhju dix+eatgbnpj39e and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the6 +2yjtmdhanfep3u,x 4j; ;9o m9gihb 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 nort./by3y6)helsbv al v- h pole entering first. As the north pole enters the wire, the induced current wil)levb6a bv3 yh ly/s.-l be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an a7)miek/ j,l aw tkg/y4xis whose direction can be varied. In a region where a uniform magnetic fielk )7k jw,a/y4/ti gemld 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 axis whoy/ ekv6x pc3d)5 b8ohase 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 of rotat/e 8y5cdko)a36 vxpbhion 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. 0*5an gaxab )uonk0kim z)e70a)yr8wzkz:x0
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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 ll 6ky/yxq lhpawzd +0/y/(2mthat 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 magn,ktwg n4 )xm-,j tmmfcwu:s 7;etic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) j2x wqe e c scv-uh:gdpwf((4/w8i2t:is moved northward at constant velocity through a magnetic fi4w2djv(e 2 u /8 hfcw-:pwtcie(gqx:seld 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 constant angular velocityrbeotabs6bu /qpe+/0 .;bll+qc3 - ib $\omega$ 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 tra;ah)awe+ /s pk dmzw/r6lt0(xnsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. T5 m;ikj;t;h( leo q-myrae-w 3he frequency of thjyohk-qmmleeat w(; -;ir53 ; e $emf$ 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 tr wiaf96 51sfused 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 dse )(p8 lej::psumz +cevice 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 conk.pt fxu+:l v7tains more loops than the primary coil then il.:xu+kvp ft7t 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 primaoe+a7ycq+,x tn7 ;fvfry coil contains more loops than the secondary coilf;n foyq,7vc+x+ te7a then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powerhw i ; udr3(ss(bz0 gmn.( x3be5r:euufccu) 2 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 circuit0 0 dxy)wq4:cl)*hpibzlr;px,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal ba9o3m.af:i tsk ttery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is :3afos9t.k mi

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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 s gzy6 co/o,vq-: pl.vperies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across o vp/:6.-g,cyqp lov zthe 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 resisgdls,73x9i4v duzoz) tance 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 indso0vchj dt/ 6t:,rav9uctance 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 s xp :vm1j4zw0beries to a battery. The time constant for the circuit represents tm04 :zbj1vwpx he time required 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. The battery ihearch ol8-+en+w;5fw9vl)fham e8 +s suddenly removed from the circuit. The time constant for of the circuit represents tnr awhe vea9;f8+fco) +l+ el 5w-hmh8he 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 ua3z78md, 5dkktc : c (k; obpkqxyl;z-nits 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 mc3u4 w,l3p 8izz)adx to 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 circu 4x g.hzi59;bfr+j 3ntght* pv.8zn czit, the currentit9c.zvg ;hz43f5b8xrjp +nh.n*gzt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what fa3m6( ++)byjnbqatgvpa knx(: ctor when the frequen3( +k nt6m+nbv)p(yb j:aax gqcy 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 across an inductor is doubled, the ivn(f74 a2g n1ggisso7nductive reactance of that inductor477i g ( nvggos2fnas1

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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 zeo/(u1u:kn2 pvf oy9p qro, the inductive reactance of py 2u9(u p1:oqkvf/nothat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. +,;-u5pi s a6q h4jr+wcao vsxIn this circuit, the currentw +ixuah4 6+qcp -vsas;,orj5

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance inur147l c*e wso an ac circuit changes by what factor when the frequency is tr74l*cers u1 owipled?

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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 voltagb0* as4vlp,gkol: xqw3:qn)k e across a capacitor approaches zero, the capacitive reactance of thas * alk kw)xqgol :p3nq4,bv:0t 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 +a.pxe+8k0suze wi htt j 1x29capacitor in a RLC serihta e2p8u x+wtz+ej.9i 0 x1kses 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 -og5(amo kw0 woz(if: 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 impedancepgwq8m;z5m c:fei6 rz )2egj: of the circuit increases if R increases. When is this st)m2qejmwfz; 6 8e::zp icrgg5 atement 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. /)f pgtv8yev5 The impedance 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 tpa6 2mnc: +vxs w2aip,he 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 b4+9l cdni;r dloth double in an LRC series circuit, the resonant frequen;+idl 4dn l9rccy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is dri;kud+v.tdfi +ven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs,5bj*ma w q fayz,,xk, 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 uniformp ,*nird pjpskh( b, (r;nsx es+(dr2/ magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti sne+r/(sb(2(, kjn h;d,*xp rpsrip dc 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 c cw3lwca/+)l+narcs7 i e9+puniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and theancl wpc r73ec/iswc)++a+l 9 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 uniform magnetic field of 0.5kuoqe6 qk6j,e(;sdd 0 g)xyr /f vdm/ggg9 g520 T. Find the magnetic flux thrkexod;6 59dydq5e k/g0(6j g grfgg m),qs /uvough 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 reduc2l(al,uem.pp4hq ,dd, v v9csed 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 coilvuy7n*ys9)o1 fbppqj z6py 2. 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 200 turns of wire on a square 78cx x.hb55cjendnf -gkct, on7s50q.y f+gq frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 08c7ny5q -f5 +t,. gb05ksndxq gccexjf.o nh7 .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 avnej(mwdleooz:0qlr-- . (; jrea 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 ando 19x8(vjxwp l area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontallyte.6.y m/p s t(5pxs (tikkk4u at a location where the downward component of the Earth's magnex.kk4t susm 6t(t5.ey(p /ipktic 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 +kiw:jxt/4r4i l prtcx82kr1long rotates at a constant angular velocity of 2.0 j4w8 kp 4lt:ikx +cirrx1 /r2trad/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 50 loops and a crof*jxkw:ne/ /he7djy +ss-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 ke;kno(3fw,gsrd eqf;w3: meen( 35fof 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 rectangula( 7oaeclv)phkyl03u( r loops 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 is perpendicular to the axis of rotation, what will be the maximum output voltag(0vapyhke 7ou) l 3(cle 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 consis1t.je : e2rkatts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to conswn3u()yz+j, wgm r6m xvh 5qu:truct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If tgq:v jzmwhr 5uwn yxm)6,+(u3 he 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 gn(1m/r-kc j qbh9bu: cenerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resist69 qgikv(,k +3jg- cn gn,hugoance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DCxba /co t,l-djz4lnq59a5n 43wgb*bh motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when runlc*dbjon9/,n5b5 l 4waghb4qxz -3 atning 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. *m igmgwo6. u.The operating current is 1.0 *g gm.ou6 w.miA. 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 zo ruy;-auk jc t);)6aresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wht6uauaj -o k;y)r;)zcat 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 resistanc uk +0jv3uxo(/wxjpj9g5* v aze 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at jjx( augk0u3vwxo/pvj5 + z*9full 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 3d2 u 3t(rsheqof $120 \; V$ 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 primar gq lxlr6f1ea(k2u.ya5g/of +y of a transformer causes 14 A to flow in the secondary. How many turns are in the seconda21agy/+l fla 6qxk5 .euf(og rry?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prnd48mte uh(r ,0 b8te-l0oyxaimary if the 24-V secondarnl0t y,r4ud -8tm ahx 8boe0(ey 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 consishibo8qnfs u 0p/2; xg+ts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currentui /+hx ;qf8gobsn0p2 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 transforme,ek2,hn5liei ay.sw 4 r. Assuming 100% efficiency, how many5 k4 h,,2lseai w.neiy 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 10.0 mA:*6pcp rje yix4 x/02.i brzta. The pry4cit6x xarrj .0/e2*:pbp izimary 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 primary coil and 300 turmx4ou*w9uwr+n l8 .tuns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltanu+utw.4lr* 8umw 9 oxge 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 x2pe2* db0 vvw4emi9 90 sowv ) *apslfkklj+1turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wha49km1ss e)*apdw92fi l w0xevj0kpbo v2v*+l t 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 i08c8qc4fi9ihyu0jint0 n;d wts secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output cdh f0t 0wcu04i 89nnqcij i8;yurrent 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 pern q +*e:y*oand its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output v:n e*oeqr y*p+oltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tubmy8k.qure 0nzh ,j,ls.. zb .rns. If the power input to the primary is 100 W, we can expect .uk,.bbzm.n .qre,ly08s hzj 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 d m evm.z+l7p:oqzuz4 p )uy7qk)/wr960 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitwz/ k vrl7q p4mu)qd.m7z)ope9uy+z : ted 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 c:e)v j9lfwqh . r1a9nnurrent at 120 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 percentage power lh)q 1fnw9la 9n:v.rejost 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 volta4yj cac.x ;vn+ge 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 the voltage is not stjyx4a.nvc; c+ epped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gener *i 39rzgmxl;rator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transfor 3;g *9mxzrilrmer 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 0.60 W. .nbua ok (/j kn*(jb3vA 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 originankajbub v(3/(k *jo n.l 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 power would be l + f6 4r,pyxwiidnjf/t 9 ao9gwec85+eost if the power were transmitted at 3000 V instead off+ayjgn4t6wr , /eo5cie9 8 xfd9ipw+ 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 transmitte:7b9(af tk wned on a line with resistance of 0.60 W. To what voltage must the generator output be stepped f9 w(bt7k:nae up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy iso di5 psdw8c3- stored in the coil's magnetic field?s-codd 3 pwi85

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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 6.5,8kjd dv1ffmr) nt(d0-W resistor and an 18-H inductor. What is this circu dmjtfkd nvr,)d815 (fit'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 circuitqec )5.rzsd(b 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 120-V AC oufnu /ohr1ist8 8.ek. ltlet. 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 resist/sye o8 lik9939eol5 s- gbt io9bh;bjance of the la o/-js 53oh; kit yeb9es99obi98gllbmp?

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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 connecmih55,kzltlr7 4 -njgted to a 120-V ac power supply. What is the peak current thrm5irj-lhk547gzt n, lough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Wha3*kslx )+oxpou/m m5ede .jp+go7z +ct is the power dissipated in the oojd+ee3*sl ugcm px+xok./7 mp)+ 5zresistor?

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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 resistor is/7m a*ralm3 of 7gtwq; $I = 0.80 \sin (240 t)$. 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 resistor em f7 jcw-6ss9is $I = 0.80 \sin (240 t)$. 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 (5opn)j ca7e 5zh( 6h vhmf.euresistor 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 reactanc3 idgzwwncq8ev l3ni) t+3+9pe of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.530slyp.4 5qjjje z8lt 0-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.i7u.v ys lz/c coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inducti2xb o-3*osqwh.u81 ,mgq qbpmve 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 120 V AC at a frequency of 20 3oy4 l)nj kz,ikHz is applied oy i,4jn)k3zl to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 3czoeyd.a t9jer:;/: rgvem*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 kH,pfod*e moln +dq ll7bei,au683 c jem9) 7,jdz?

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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 ne g(pu),lp 0bha08tgbmwqse 51eded 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 reactance q qomom0f f+od*-, ds+uo un,-fsds-9arz5 7yof 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*1.7hq skcbyg+zkhh,m .z/kc; e ao* zqkaoz 7ehz + k/.ychg,mbzc*1.* hks; ?

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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 at 1000 Hz and 5.0wdgryua 4w +(9k eal2* V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 1:ddr;g dddi 715.0 W inductive reactiddd7 ;:1gdr dance, 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 8 sxj7;/b/mhnbk4dy bb xl.0e-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s 4yh/b/;ndlbsmx bj 8x7 b.ke0eries?

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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 tp-tpx) z mam6- :vlk5if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s klmza t-tp) :v-mp5x6eries?

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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 induct; t bjru6u+rp2cdh ebw2)f/ 9mor, what is the impedance at 16t+up;2) d hfc wrj u2m/b9ebr000 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, what0/q/k8yiz n i3 v:z1oeye8ebx is the phase angle /ny bqy8z 1i3ekzi/o80 :e vexat 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 circua7bpif2* s i q,2 0cy6jv1ccejit with a 20-mH coil and 1.0-mF capacito y1ecjas7,ic 6v j20b* 2ifqpcr for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is neeq z;x5p 4g,o-(sqwxoqw16y j8k q xym7ded in series with a 100-W resistor and 15-mH coil to get a wq q q6, o4zj(o18-xx7 5 symqkypgw;xtotal 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 serie; ,.b zlkxp-3tr3ja tas with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?j3z3-;t p,lxa ra .tkb

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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 res2m2*so(eqn c/t.c es ristor at 1.0-MHz for a total impencoet/(m2s . rqe2cs* dance 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 tzenyj:j9vd, 0 qui:j) he impedancnj:ve:ujyq j0)d,9 zie 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 * aivcm4r7i*pjq9cl a q; v4j01.0 kHz for a total impedance ofr7lmjqccv9 q*i*vj ;0 pai 44a 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 i/u fcjtn2k-mo0p 7wk/ n series with a 10-mF capacitor at 1.0 kHz for a phase anoj/ k7nuk20mp -wtcf/gle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for wb:s*qojdv75 a total impedance of 45 W?d*7obq:wvjs 5

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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 1jx.ig9xypbya 8 , f6-qn4oj4t x;1you 00-mF capacitor at 120 Hz. What is the pha-xn;t ooyq axj1xpyg f944ib u. 6,8jyse 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 1500 Hz iph t/asvbvdkcr3y) ,wd.c727 f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte7 )ad r2d v sw7.bk/cyvhpct3,d 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 1i qzkt.g)c/l. 0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms c).k.c t/giql zurrent 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 reactank(m10l)u*qfa ,xaq hsa)e6 qnce 30 W, and an inductor of inductive reactance 30 W are connected a0 1 q6 , hkes)l()qnxuaf*aqmin 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 cok+iqsbxkff3)nh1k- 4 l e(/ cy 2opgs5zu- w1yntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecte4yp ghkc xesw lk of1ys23ku-q /(+z ifnb5)-1d to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for y,qkxe *azdoqo 7m).;a phase angle ofeda7)q, qzox. km y*;o $40^{\circ}$ 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 hasg rkx)/ic* fuf0-zui8g5fi 4h R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequencyic)x f 5u4gg8i-kz 0uff/hir * should the circuit 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 out8c 3-ovqiy0 .b k:i yp-olh1huegv4f 0put in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit0ey8b l -ovch fk. 3h40iuovyg1i :q-p 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 circuno9ctk )rq g*(it is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W.w1k5m;h , d hi snetyczk;d*:7 What is the power fz5 whi,c;nm1sy;d7h e:d kk*tactor?

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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-W9 ry3+ c67dmt*motqyx resistor, a 10-mF capacitor, and a 0.my q+9y* odx76rtmct345-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in7,t612sid2sa eebrg j series?abs6j esg2d2i17t r,e

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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 capqip b:5/n,bj facitor for a resonant frequency of 10 kHzn 5/: bfbpqj,i?

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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 i h:8y(ne+wg -nhr- cbwn series with a 3.7-mH inductor for a resonant frequ(--8 n crnhy webgh:w+ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor m. 7)/.0/ )cm an lteysnlrotrmust be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuitot/)r y/ ctsla7 . 0)nmnerm.l is to be 1000 Hz?

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