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

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following ar)l) -buj q-va d .plxm1e;8lnde units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductioni (g0 yy)5drqa j-7(e0dcq mfg 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 loops of khr 3fipv2d1 (wire in a coil produces what kind of change on the inducif21dh pk3 vr(ed $emf$, 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 magneticpm5ab0bt 6j*3sw7 l8ap* hcog field through a loop of wire produces what kind of cht*0lbg bw 587 hj oamc*pa3p6sange 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 chomj-uzr*wmda l/ mwc ji.v4/k z(0v1.ange on the induck.vzv-/c * (ljj. uwimrz/4w1 omda m0ed $emf$, 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,yh sypl s1.dskq)g 15 magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced -w so8sl(mtk1 - 2qit ro97mxgcurrent in a conductor will be that which tends to produce which of the following effelr(tmoso1 m2w98kg s-q-7x itcts?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab;sbozyk 6 sf4e*uu y u5v2nq24ove its center with its north pole2 2uv5 s;qyy4 f*n64bszk euuo pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnetl;m del(1j-o z is held above its center with its north pole pointing down, and rel-odmz1;( lj eleased. 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 inilf 6ziza216 yl:z:vaj. ba q 1n+igo, a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the+yva qz :a6ni. 1aliz6f:21boig,l zj 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.247kyrdv ,vg( qsz7dxol fh5 magnetic field vector points straight up. The magnetic field suddenly grows strg4hq v7.2d5l s,r7xy zfk( odvonger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a h,1,q i6ezam si6 u.kgworizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction ok ig6,6a 1 ewzqum.,isf 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 hori+ sqsj8erq 6t:zontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from aboveqs:q t+6 e8rsj, 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 wiuy2sf g6m.v as- lbo,)j)vz ,h6pnn y5re with the north pole entering first. As the north pole enters the wiov)) 5 nyvz2-aulyjmp66f s,,g .bnshre, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular fc +3elhazsx1:b8nk6speed 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 f6z: ka esl81nxh3bc+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 whoseq38t77fddem lo khxvv 8:c)p2 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 rop)8t 3hdql7 fxvmd2eovk78: ctation 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.drxx4 u4) hbc2
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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 thn-r/m u-x faw1)el6jtes n /m.at 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. Thew orqubu qjnr+*; b6,4 $emf$ 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 northward axc:a 4ikoz*. at constant velocity through a magnetic field that points straight down. .x: k4*iaocza 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 znp yfm nt.;cpd0cm w.q+i2; 7angular 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 transformss;imtezj5h ;do 53j7nb ,lk k*

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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 r w,+nv s +ap5o+j9vzx 1e(judcevolutions each second. The frequency of the+1 + njcap s,9xw+jeovu(zdv5 $emf$ 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 dev7-nefo8e j7bz8 /pic in) ;mvuice 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 de 6gvqf:) 0/q mfu k3pqy/p53hrx)uwn yvice 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 tlf qq6 o0x2 +a(visa+yhe secondary coil contains more loops than the primary coil +qoasxq0+ 6 vfy(la i2then it is a

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 coilm./ zf4x7bk3 t y,bxgj contains more loops than the secondary coil then it is 43/bx ,xjky mg7t. zbfa

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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 a/zm s-9c*yggd (;otvpower 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 circu l 0og,qd*+iidit,

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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; 12ihb7azfoq to an ideal battery of constant terminal voltage. At the moment contact is made with the ba1q 2;azob 7hfittery, 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 batlcut+:c+w,8bf7xos lm:y /jetery of constant terminal voltage. At the momentb ou8 :we,/:ljtyf +l7cmxsc+ 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 and resistg7,w86k rvq (s e:svzoance 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 resi-wl0r;mwm5.5b0u snep y :nyw stance 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 connb+.yga 7h xsikb3 a(p8ected in series to a battery. The time constant for the circuit represents the time required for the cur s 7.aph(yk3gax ibb+8rent 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 batteyh-rh 3lc*95jzy k ;jory. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for t y-cj935 o;h *jylzhkrhe 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 hawi2ycz6kjlr3g273k, -/ta4v0y(bdgqb n l aive 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 connectmt/2fxg;;x mu.i rc hs jtg643ed 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+ 9b+u(ewg 2karuhjt1bk.wlo*qx 22f supply. In this circuit, the curren+gkbt o+hwq2kuu1*2lwf 2a(br9 .ej 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 ac circuit changes by what factor when shrlv03lc* u4the frequency is 0vcshlulr4 *3 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, th/03p xor 5, af*ikiyaze inductive reactance of that induct *xrzo ,af53paiyk 0/ior

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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 iy7k.zm5cxy: *z1hw 2* omem qll5u.itnductive reactalw7x 52yolzu zc: .hyk.q1*5 memimt *nce 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 anz1n+co u;bkzrpx/)n e-tl;d1 d,sznrb;tz ( 5 AC power supply. In this circuit, the curreenb z zdbzrs;)n; n;1d,1pot xz5 -/t r(cluk+nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor vn3:qeg(e)4 3fuy8fbw j xhc*when the frequency 3 )bj4nv wy*x8 egqhe:fcu f(3is 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 voltak5/bu77ias+ pco6yq bge across a capacitor approaches zero, the capacitive reactance of that capacibq65ab ic7/uy +os k7ptor

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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 o bhk:a*u)jz7and capacitor in a RLC se jhz a7*:)ukbories circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is def o*h2wslat(f;i/+q 8p th+tq fined 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 increasesf-v-jo*- do hi if R increases. When is tvdifj -- oo*-hhis statement 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 2 85fhpojyfjhosm :vp;+r- )fthe 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 ci+;ap1hdoiz8 b 7vm6af/ 4y*l+r zgcfprcuit 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 ;p hzg zeqw-ml62 5hmo( t)0ygn(fre7series circuit, the resonant frequency of that circuit w hz-5lg0(pz )( eemn26o;rhtyg fwmq7ill

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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 dr fd22qpebr n9+k2ca-d1rot y-iven 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 lwt- c t,ode-6RLC 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 marv n 6+m71hdohgnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field61r+ vd7ohh nm 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 jv:u 2)zf*nx0nv0o2i-echuiz *l mn 9rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the phnn:ufiiemzu2 c0-0*lx)zn oj 9v*2v lane of the 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 uniform magnetic field of 0.20fv,;kfudc0, y: zwq9b 6l- ttn T. Findzc lqyt9, ,0:w ftfvn; dku-b6 the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single 72md c,kl b,+xcmwol(/cc *byloop 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 fro,uoit dfjln6hc3hksb+* :k/we(1 8q wm $4.0 \times 10^{-5} \; Wb$ 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 tur8 xt-trxfyv809df5j bm ug/h0ns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the 0df-hx/0jrxv9t tg8 yfum85bcoil. 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 wir7lqchoi-n 7)f r*n- sde 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 8uqg8h lx vi/-lz3g9ebm u2d. and 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 horizontally atun m5zfe k( 7zdwl+jqikn 2,64 a location where the downward component of the Earth's magnet n,dim4l2qnf+ 6k7 ( uwj5zkzeic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angl 2n6 dzj,6x nqkzgj ;u:l6ct8ular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fin6qx:c,u8l6dz; n jtkl2jgz6eld 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 generatn9swq:b nj+ah0 8d4jmor has 50 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 consists of f g ejpycu6s)y+.x4i5100 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 loops on its armature. Each ly+5zpz/:z44fw-yf qxe w *fnyefx)k - oop is 12 cm long anz-+yx *wfzez )4qefyfk4/wfy:n5 px-d 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 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 ozye,/ 4hc+ ema:tdin; fa8r s:0z af/df 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 wis,p7 k/bf ne98g ghqa,o7.oore h to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availabn ehe,7arpq8oo, .b 7go9kg/fle. 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 *w t rsx*ct.zj,a-ujx +yf9s/with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opomucc;n p3 s40erates 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 resistang cv af r0mw.(e9:jjm;ce of 6.00 W. The motor operates on 120 V AC, and when runnincfg9 earvmj( m.;0j :wg 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.2xke yuuh+sf*9b .tb. The o*ehb+b.k f. u y2x9tsuperating 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 con+uja p3 ,p0vprnected to a 24-V power supply. The operating current is 1.+,rpa pvp uj300 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 8j3vc cap93ja2orlr1 resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What io alc2vcr8rp33j j9a 1s 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 transformwd6lp6wu8w 3lyx 2g q hlj59,fer is needed 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,s rrn; ,thxk(); nnjf 14 A to flow in the secondary. How many turns are in the secondary?;r,n (tfkn,rxh n ;sj)

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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 necessar2 .d8d/bi 5tez4nqe uiy in a 110-V primary if the 24-V secondary has 1 .uqtzbi4e5 dd8/ie n200 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 coi fsp.,*caf ecu. ha3y xl5.cv7l and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the psal3chxfyp 7c5v c. .afeu*.,rimary?

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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. Assuming 100% efficizh,; odyl2d;/ my l -giawobjde*(2j:ency, how many amps at 24 V can -y2ojd di,j 2mda/*l;z(he ly ;:gb woflow 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 nmqr,v rw ; mz)fktj5*gd:3u k,eon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?k5j)u3wfq*, ; zvkrd:rm m, tg

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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 vcz*od hc 2 +mqnl36vixlz*0jylc,(- its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary*vc ,yqnc2i+ 6 xmh3z-(0ovzcjll*dl?

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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 turns on n.n)+x * p,se4n lvq mdyxj.q(its secondary coil. If 120 V at 2.0 A is applieevy.*p(x4j qs ).,+dxml n nnqd to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a trayyjtc7tb-4 .-xiq* nunsformer has 100 turns and its secondary has 200 turns. If the input-ix 4 -utyy.jtn*qb7c current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary/tt/ jrp0n*d,iujzt 2 has 200 turns. If the input voltage to the primary is 100 V, we can expect thui ,2 ttpjz/*0 rdntj/e 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 transformer s8a9fah 5 cd1dhas 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output 8df9 aha 5d1scof 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 hbl(kf oiwn.mk j+2xdy -0t4* 120 V. The voltage is usually stepped up to kk* o-d4thxb(im w.0+yj2nl f 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 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 120q4 4 0k+8f7b(whna ibtk )yxjr V. The voltage is usually stepped up to 4500 V by a transformer and tranrbhqxjywtfa8kkn4+i0( 4 7)b smitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualz rov:-.ejtd 2ly 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 z.vr-2 d:etj ovoltage 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 ton jin9*hwz-4l8ree 3jtal resistance of 0.60 W. A generator produces 100 V at 70 A. In or*jiz-lr48n hwe en93jder to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totalxsjb3spme0)pqskwz0 f 31q *8 resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. Whqk0*1jm3eps s8pbz)q03fsw x at 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 power wouldc)imlmbqxw 7q9 wd )), be lostw ,bqw) x7qd9 mmi)l)c if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V atrm 2b-djka+ l4 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmisk-b ja24ldm r+sion is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the 6gmnpo h+ vx8avyw. (.coil's maav+nom 86gy h.xpwv.( gnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is thicys7 i5qajo4 ih d8j;w*,wdnfb(; o8 i5qod 74dysa,*hinwjb(;w;8fi 8ij ocs circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circox+ rvdip.+tpx , nv,0uit 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+*tm5 t6p,v42yf +rn wq pefom into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of 6 1)nzp6ku28wle.0 swnoa zyc the la2. 1wzcpu z6a0w) 86knsnyeo lmp?

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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 conw g-; sq b. f**n4tktg-omy)cnnected to a 120-V ac power supply. What is the peak current tn*m.tstg);*w c-o-g4q fk yb nhrough 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 supswy) 3-mh fb 01jav0phply. What is the power dissipated in the resisto)mafy3 wv 10-shp0jh br?

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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 fp7ro tf i+ppv2 4v9d5dx2rf*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 resuyi3-o3udy1 wl,4 bgfmv o 2:eistor 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 0.n xcb .os73j5w7 s7wnrwkyu 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH induct:.u*xd qh7,n(d qm ynvor 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 2.50-mH coil at 1.s8: j) elca0ke1bzcrkk tz 3ar 9k+o3000 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 t jg.4se:s ,fd0epx3 e14.0 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 fo hzm9xissu8 ,:x. att+r 157 W 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 120 V AC at a f/c9- vtf i0,nxymikvx) o32 nsrequency of 20 kHz is )fotyn92 icsn -vm,xv 0i3xk/ applied 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 110-V, 6irqgv+sgs(g ;5nbn7 xx03b+n0.0 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.+ir h /de-+jxn7-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 f/zw+3v cpb*der )lg 1have 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 .5+ k 9zehpk5emm)zuyhhf*v3 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 0.0117wsw7 kp*- fo) yazzk0-mF capacitor be 100 W?a-7zf yp )1k7ko *wszw

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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 0.00109cc*ghtywdk:c9g8 ljcj ,;*u-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 W resistance, 15.0 W 3jsko 0zy1fmb 25 xmt.inductive reactance, and 10.0 W capacitiv5zk3 s2by1 m.fmx0j ote 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 15000yddzw/y5 0g0wv v)iph n5dt* Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieg) 0w i v/ytd5*50 w0dvpdyhzns?

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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 resiojx,-g 9mje0jq a 23ktstor, 20-mH coil, and 1.0-mF capacitor are connect29t -j3xkmog ,j0jqeaed 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 a65r,;ft3xwyw ,z mqfp 20-mH inductor, what is the imp5 f6 ,x3tpmy;rq wzwf,edance 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 connecte kk(aa-s5 j5ruz 8:vojb0h7s) zp te/td in series with a 20-mH inductor, what is the phase angle at 1000 Hthjs)5ob vs/ ra8 7je- p(u05ztkazk :z?

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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 coillnpsi/5apnnl(dn7n- i;65; e cq2m j(eo*z vd and 1.0-mF capacitor for a total impedance of 100 W 7ln 5siconv lm z-n /;*jpnpa;6(qi e2(d5ednat 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 hrr/73xwgtx:capacitances is needed in series with a 100-W resistor and x gh/3:xt7rwr15-mH coil to get a total 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 inductor at 5000 Hz 2i8 :d,m) 6ytfq8ue p op7yimmfor a total impedan 8mf)6impqiyod uptm,28:7 eyce 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 serd57mrkji w32gygt 9:zies with a 100-kW resistor at 1.0-MHz for a total impezy9 73imjg:5 dtg k2wrdance 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 capacitocq sj-pw ,5hk uxr3s5c;qbx 5qe577oi *lila5r. What is the impedance at 10qu5 5;qr pc5b-iq5 wo ,ix7e *hlc3sxkl5s7ja 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 needed in series with a 10-mF capacitor at 1.0 r0-o.m mdn(mg kHz for a total impedance of omd 0. (r-gnmm45 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 fq bqn0/aw ,b kv w/9w8k)6 .prwwrlq(por a phasw.9(/pq v6wkwwk/b brrwaq, 8lq0 p n)e angle 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 433hgwl.1fr9w my wi mneeded in series with a 30-W resistor at 1.0 kHz for a total impeda .mwl9g3yr3w4mf1 ihwnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-m(c.oqjr fxaj bc1v+)+F capacitor at 120 Hz. What is the phase an 1)j (x.c+ ar+ojbfqcvgle?

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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- o,fql:ci8) tfh*xs(x mH coil, and 1.0-mF capacfx8thl) fc*qs: ,(x oiitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W re/.gc 9 ,/xoemwa z oavpof(my(0d:/pc sistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Wh0 cpvca.zw9 eg/x( ,pma f:/do/o (yomat is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inda(sy9a r-r v2wuctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Wh(-2raws 9arvy at 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 usv :jy*njl.70xs 0osRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 00sj0:v.us7s jo ny l*x.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 with a 500-W dg :t*l.epd,kresistor for a phase angle of:ldg. tdek* ,p $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, ex;y3lt m *h:t1gbjaji-/s-x :bruu8 C = 10.0 mF. At what frequency should the circuit be driven ing i*ylxs1tubx j8r-;a3:et j-:h/umb 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 cirh j-h +k4yz2;fucwi 1hcuit with 12.0 W resistance, 15.0 W ind4zhk y2w ch+1ihu -j;fuctive reactance, 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 circuitt,u+cr7ky)7gk k,rfy 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 impedqo .yr;2t- lgqance of 60 W and a resistance of 30 W. What is tqo.rylg -q;2 the power 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 cr18l c6kvf*v x.3linc ontaining a 50-W resistor, a 10-mFv 8ki*rfx3.nl 6 1cclv capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mmuso4ijm) :e.F capacitor and a 15-mH coil in series?uje: s. om)i4m

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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 7 1r8v3*3nrfijb g ;ywb gt8xiwith a 4.7-mF capacitor for a resonant frequency of vigr f7wr bbn;1*xj83 i8yt3g 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 nt;r tdbp m.02beeded in series with a 3.7-mH inductor for a resonant frequep0b;2tbrd .tm ncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mHkn;c s c it//-0bhqq)i coil if the resonant frequency of th c)qbn i- q/cst0ik/;he circuit is to be 1000 Hz?

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