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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    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 are units 8inzf wp kyb:b0, rom r36qxeqyj/0 :7of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that theeb k2g;-iif m+ $emf$ 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 change on tno)ke0 vjk1y5 d7wsg5he is1 w5kn )5evog 7jdk0ynduced $emf$, 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 whazc6kv.pu uw86 t kind of ch6vu8uckp.zw6 ange 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 wh j57zy/5e ay-kuali.gat kind of change on the inducey ekz ulg5j yai7.a-5/d $emf$, 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 removeducw jvd4:n(8n4ko b0i from a 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 inducedfk;z :vo.bbs - current in a conductor will be that which tends to produce which of the following effeczo :.bbfks-v;ts?

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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 lxlc vkxffjr:b 6j4ea*:/* t; horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abov *;:kt /rjjv l4x*x6c:elaffbe)

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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 magnwkp gq(9 (s3 (txx1 ;gbxtpsd1 00iznnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fbzn(1(kqg3pdp nsx swx;1t 0x g 9t(i0rom 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 where the magnetic field vecto+ ;ud *iqirhu y( r e5q22fh:pl;pe9tkr points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this ip uq peu;eh*r :l 9;tdi(hq2 k25yf+rcoil 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 ln-k o+91ha 5dkqp 6qnmagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewkn1l6qdh p -5aqo+n9ked from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regionzdovmri z: -1j t:c80v where the magnetic field points straight down. The magnetic fie-zj1dvovc8 m:i 0z:rtld disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries r)qvk,t.yce xwt ifn);o :7+ - v.sgqean ever-increasing current northwardeovq ,xk.w.);e fsvr+i)yc-g7:q t nt. 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 enterin/(h +lu vak7te))dzjdg first. As the north pole ente)dadz+h(etj l ) ku/7vrs the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosez/*ke jvy:n7 ih9mpl* direction can be varied. In a region where a uniform magnetic field points straight down, what mkvp ijm*9n7 ehl:/z* yust 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 speem ku1l(c;ak r8d about an axis whose direction can be varied. In a region where a uniform m lcr1(m kk;au8agnetic field points 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.n) hnb4h3hky z+ t+5hc
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an:h(i.f j3rj7bheyofjv y2y39 $emf$ 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 magnetiz .c: qqj)y7ewc 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-+3pirbky)n(y 0q7;jj 0w)bpjdzx x h-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemz jqdxbw ; i7kh xjy+j0-b)nrp0p(y)3 ent 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 constan 0g38 nwksdmmrm6,vaorc)* h 29jtx4y/,x awmt 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 tra1j sx)b/ ehdk2c46m djnsforms

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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. The hl8y1w ig ub:h:*xcr+de;w8 w 9-hg iifrequency of the i1uxww-h:; 9bg*yh ei:+idhg88 rwcl $emf$ 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 devicete10zc-zos -3.j lpnnu8k8 rr2l uc 5a 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 device dp65vd ;thteomg+wsoxf7x-bwr3 ( ./p28jhw 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 p8tdbpmx9al mzl ). .6secondary coil contains more loops than the primary coil then i.lm pa6 ) d8zpbtlx.9mt is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more ,shpk cno4;w5 yxwz+ ,05hdpznq 7k;r loops than the secondary coid nqn;z5whw;p h7z5y,rpx+sk 4okc 0 ,l 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 power inkpaz5e 8:qwg2 m1/*b6f pkxriput

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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 czhnml: k b6, -o1(xcytv+vcq .ircuit,

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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 battery of constw2z,pv7(j)fu.1 rx1ie uq6 nnd4 g vaoant terminal voltage auzwnug,fvdq1.oj6)x 4n72v( ipr e1 . At the moment contact is made with the battery, 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 idx*8j hyd, sgb:eal battery of constant terminal voltage. At the moment contact is made with the battery, the volt:,dxy*bj8 h sgage 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 aw:7t0mj;e qjlct 7u7resistance 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 resistan+ds e h;cwlr40ce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time const1m/cj+ 8rb6 -x lhhtiuant for the circuit represents /hium1+- 8rxbhtc l j6the 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 (ds( d+vwf66*g,knfn od kj )cbattery. The battery is suddenly remwn6 dndgd6c(,jk)fos (k *f+v oved 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 have the same 9jztou7xi,kxdp,+e ; .o.jye 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 circuit,a qiiw0 d,wbtsn( (x 1u7mgq1) 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. b.3(j vo,k/4yzsa7xuf3rrf q ob.k o 8 In this circuit, the currenr.ox/k3ars.o ,zfuv7 qbj3( 4 kf8byot

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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 ch5/9jo7ub w tld.njc3banges by what factor when the frequency is trju.o3/t9n75 bwjcbdl ipled?

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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 induns3t,km6 7 bvmctive reactance of that indumnm kb37t v,6sctor

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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 voltaquntyiq;9y 59x. e r8(y,o xe: sx4fxkge across an inductor approaches zero, the inductive reactance ooq:e8y 9k5fy,(x sy9ueinxqx x; .4trf 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 po, 7k7khq2 w2 mspupr35 5jjsrewer supply. In this circuit, the curre5 j2 j,5k7 2emp qrs7prskuhw3nt

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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 wf 0i*tt1em .mzhat factor when the frequency*i1m0zef t.m t 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 a capacitor approaches zz2 wn3 ynj ,e)h:v5h(ljohen *ero, the capacitive reacnhheyj,3 hze)2n *:ol jv5nw(tance 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 b:c w t*tt8ndf:etween the voltages of the inductor and capacitor in a RLC seriesn*::dt w c8ftt 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 dqqn7cf no2,zv8;igd,mx +j0 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 iv gkl+c,njx5+g w -apxgmj67/ncreases. When is thipaj+gv+7 xn, l cxkg- /5g6mjws 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 impedanjx-z-hx8 iy r-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 circurb;tze:zcd718cih s 6 it 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 sermt2j tb604 *pj88xrjko wan (e; 3vyfjies circuit, the resonant frk;ab4n 0jj6 r2jt3y e*j 8xfwt(o mv8pequency 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 driven by d+qdtfx l4p5y2a3 p 9zan 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 circuv:5gjow ; lv(dulq1* uit 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 ld omysk(q90 t 9h;; gzxczeson*e9)/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 vector o yk;m h9gct) xd9en*9zzq o(/s0e;lsare 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 uniform magnetic field of 0.2+waj (oee i7wu 1-yhq30 T. Find the magnetic flux through the loopoa u17yejwi3w( -q +he when the plane 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 fieznpmm* *24g)f cvjao) ld of 0.20 T. Find the magnetic*nf jao m)m4pz2)cv g* flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frt5-m . ikzn jz.s gkxoulhfn/lv(;--* . 0ridvom $1.0 \; m^{2}$ 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 cha /y.id:o eo3(ly gl8iynges 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 frame with s-an1 cs5zk fg1ides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average valua1 k-sc15gzfn e 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 ah;4gp-px1 fhq rea 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 swgkp +a 0mwu0 u9ji.52enu* uf;t q*cand 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 horizon 8+ek qs8owhciao1xgvz-3 wm58o.n :y tally at a location where the downward component of the Earth's magnetic go+smocz85 8kwan8 wohq3:vx iey .-1field 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 constt*mo6 cp4 :4 lb7q(iy/.n *rkdcf dcrvant angular velocity of 2.0 rad/s about a :p nyv7.qc(/b 4c*dil tm4rc*rofd6 k 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 haqjt lk:sxx; eo8 h/t77s 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 100 turns of qv br cnyxk62fl3s59ve xq/1j3x:pk9wire 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 lo fm7 a(m4o.zivop 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 f a.zi7vo(fm4mield of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area ; lqgh,t( b*oc j8 8gt pk,i8rz6o,pk,gdth: b$0.090 \; m^{2}$ 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 ge.wrngr)hzj :1/+soj4ka csz6nerator with an output of 12 V maximum whj 4 :6+)oc/wazrzrg hkjs1 .snen rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator w di 6.n/wyjc8i;t(kk qith 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 operates on maja9ego q); tl8.n3so;yty6 $120 \; V$ 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 /jdia9cf ef,3of 6.00 W. The motor operates on 120 V AC, and whefeij /a,f3cd 9n running 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 yvw:sg; pvs+5*g u .whconnected to a 24-V power supply. The operating current is 1. +gwh;yvs5vs :gp *w.u0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sup9czu25 l bd :*q,whpwpply. The o5* qh 9,w ppbczw2ul:dperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal res41 cw wvlv q)j(ryeiq:y :qgsv92d(r7istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A al1d c 7g4w(s:y(9wv:i jqryrq2veqv)t full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary vo(j dis7km,0*suo c r0oltage 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 transformep:tlvcsu, uid fvfa1* 9y--b 3r causes 14 A to flow in the secondary. How many turns are in th fav3v-:uyt1c -9 dfb *,plusie 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, hotc.hfw f06s(z 2b tk;iw many turns are necessary in a 110-V primary if the 24-V secondary 2zibff0kc ;t6 tswh( .has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary ch5clu,*hmc hr: rf) /uoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currenrh: cm/ )5luhch*r fu,t 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) gz7/q30 chyjwrq nt6 the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?ty/7hcw j)3z rnqg 60q

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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.xf, qqtv .r:2gvnu33.k rxj4 e The primary coil opj x3kq 32qvvxegu,.rt 4f. r:nerates 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 turns on its secp vrzi)sql)zv y6/: b9ng;oe,k/ kn-aondary coil. If 120 V at 2.0 A is applied to the prime gk yn z;r6qavo:vkn9 s,z /-bp)i)l/ary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary bdq(3s 8h un2:no0 qidcoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prima0 nn:sqqdu38 2bdoi(hry, 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 transformer has 100 turns and irsqi flrp7gvny77app5937h* ts secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at rfpgp7hva*7lp 95rq73ns y7i the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 :gx/ronyk-rmsd +2 r;turns. If the input voltage to the primar;ry/n :sd-m+or2g k xry is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondau)sf:fp wb d0tci 9( yq6gpkdufb5 41*ry has 200 turns. If the power input to the primary is 100 W, we can expect the power fw)i1s u9kc*f4ugp6:dby 0bt5dq( fpoutput 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. The voltage is usually stepp+yrk:n:2 t.4 ;t y7ekjhtryxz ed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fi tr jkyt.;7e:2yr xh :nz4kt+ynd the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is uscyj:oj yos) l4z;,p u0ually stepped up to 4500 V by a transformer and transmitted through a power line of total res4yl szjo 0 ,jy)co;up:istance 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. Ti*x co-g tdl;vzg: *ud ;-,.uza)+v uov.qnpjhe 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*zp+oto..u-;u:;ag*vdz iuq)-j cnvlgv d, x 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 oxs e+ak8kb+yqwc(9pb2 yt : p;f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due wyak +;pkxe +(bb ty:scqp982 to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resist: mw5klq5;plfs d )m:e5s;rgnance 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 tranqrwf55l:;5dsnmelp;): k gmssformer 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 dow 3biqhll a0ln ql)8zhm1774qwaz0l g/n a 6-W line at 1000 V. How much less power would be lost if the powera1bqzlh 0n78/)0 li l wazlg3l74 hqmq 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 at 20 A. It is to be transmitted ol6g btk *lfs z7y.5y3ln 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 ogf3y 56*s.l7yz lktlbriginal 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 curren8us1ey2b at/ s)ldgrvr(focz1 ;fu 9;t of 5.0 A. How much energy is stored in the coil(2y)ur;9r1bvof sd8ul /f z1tgc ea;s's magnetic 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 ya1wha8sv.bxies q)/v 60 fm*is this circuit's time co/h q0 )aw*iyxmvbsv.1aef86s nstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltag,l2k pz+/xdm te 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 outletezjyp9x-kfs3k 05 0 j/bn,e5u1 sords. 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 apa oca*u1 +3qv 120-V AC outlet. What is the resistance of the lamco1au3*qv a +pp?

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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 connectedeadoyq-9,cfz dcx(h 8;7u(7erqxz(y to a 120-V ac power supply. What is the peak current through the resist8z,ro9y((fxc hy7ad7ee cx(-u;qd qzor?

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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 connect skn/46lhnm25l r*2lsu7cbx ped to a 120-V ac power supply. What is the power dissipated ink /sb74u 2 xl2l5h6msrcnnlp* the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50mfhy0 7ew +dl0:x h1kq-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ( dnwhutl6u*gv7t2 .cbn bl/e8-c-hy,fo 9us is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W ; reg/tc t76g0pdxtb3ul.q *n 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 induk*m8m yse wr6 qqz kp7oj:5;z2ctor 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 cob(li) s1rnx2kr6 7hovil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive rex/.bo iy sbb5:actance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance a((o;np;pppdutn :7 ij/h c. rat 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-mHb6mk 3aa23yzfvn/ g:h inductor when 120 V AC at a frequency of 20 kHz is appg:az/kn 6ahyb3vf2 3mlied 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, 60.0 Hz sourcegjvknh.iz692o :;/ inx sq;vu?

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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 kagmqe649( c*nu,qfp sr25n o sHz?

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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 ; egmuuau5o5 0xd+rp0 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 havebqa jz0d1 jaor,nv/3. x k;ks; 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 thrhl2ye) ccrpay k82k+s0 wr3 r:fq 66ke capacitive reactance of a 0.010-mF capacitor be 100 Wh y2k 0r2r6ak8 3cq6w) : ryfpk+ceslr?

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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 0.0 ea 8ak2x1*aar010-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 v l9l(oxk4 rc6h;2)-bjlo: n2ip8zuwdb6 kwy W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react(9lio6k:wdcvu kylb2w -r;zj)b lh x8 46on2pance?

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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 gq oe 1, xvo.far/29poa 100-W resistor, 20-mH coil, and 1.0-2eaoxqrf.9 1 /vg, opomF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resist5qoh4j7s5g ft or, 20-mH coil, and 1.0-mF capacitoh5jq ft4 sg7o5r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected i wh;d4on;,ejm n series with a 20-mH inductor, what is the impedance at 100 hemwjd4;o, ;n0 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 isv5zv . rwnc1fl,l (c;g connected in series with a 20-mH inductor, what is the phasen;vr,1z .5(fvw c lclg angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coi sj3jon q(ixm- ,l*yr9l and 1.0-mF capacitor ij( qy*jl -r,sx3mn9o 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 needed in series with a 100-W resisj, +tq(vjiz c/1vs/yr -ga 7lutor and 15-mH coil to get q avi(1 jr,-tvugsc/ l/y+7jza 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-obz :zf8wr w*5 s2im(:7 ttwwzmH inductor at 5000 Hz for a total impedaobwziw :t (5fsw:2z mtrw7 *z8nce 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 resistor at 1.0-MHz for k ;-k o:w.kmaxpr +xd5a total po5- .krxxk;dka m+w: impedance 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 4 hptg 6*k2z3/*+v bl aiwpbekwith a 20-mF capacitor. What is the impedance at 1 kv4*w3hg z+b* bpeik/a pl6t2000 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-mnhtq *+xn1 /tcF capacitor at 1.0 kHz for a total impedance xch* tnqt+/1n 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 b 0u9ccm s18k-e6 qdahj;zl-c with a 10-mF capacitor at 1.0 kHz for a phase angquk8hazjs- 6mccbld 10 -e 9c;le 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 re4p-hp)r9*7fc j: *un tkzj 2mhi bk0exsistor at 1.0 kHz for a totalm-bp)z2tec0i kkh4 97x pnhjj*: f*ru impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is thepw hc4h5e5 l,p phase anphce 5hl ,w5p4gle?

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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, zg*8clpyp i4c * zi*d9and 1.0-mF caypcpzd*9z8 gi**li4c pacitor 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 resistor, a 10.0-mF capacitor, and a 0nrg )kkt 3(;hp;/dqfn.350-H inductor. The circuit)/tgq(kf; n3 d rnk;ph is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reah5xj6n 8ff si*ctance 30 W, and an inductor of inductive reactance 30 W are connected in seriefs ijhf 8n*56xs to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, adcajbgx5u x/92 0l41 kuf/gdj ;rwve 0 10-mF capacitor, and a 0.45-H inductor, when connected t 1wvclg ux0ruk9g j/x;ea40 5dd/2bj fo 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 res p y8dlzp.y4:m*g8q1yzimtlkm)xf ;/ istor for a phase angle of p/4izzyl:p; 18.tkmdmxg )ym*8flyq $40^{\circ}$ 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 hasr he8b 66mdrz ,0yn lnk/4t:fu R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should 0 kmufbt86r:,/6h4lrny en dzthe 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 output in an ac series circuit wi g,da/n vvw,keq wcp*o(zqk6q9,n;1kth 12.0 W resistance, 15.0 W inductive reactancew9c/1q, anvozvk (dknw ,qpe6 *;q,gk , 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 A+b4e:o 1 b+eir)h mbpln )-byxC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. sjqka:q 1qx* y/2gqh 4 What is the power g2 y qkh jqa*/qq:s4x1factor?

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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 containi);+k po jf)i3f7wz tmbza6z3axio:l wl,0e9 xng a 50-W resistor, a 10-mF capaci0aioi)3xaef+zt3jo6kl 7w )p lfxz:;mwz9b,tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15 +c8 q(ijkp tb1bxx+-d-mH coil in series?q1id c(++8pxbxbj- k t

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant9,wez vx(1xnu dn w:a5pa0e8c frequencuex p5(1 x wv:,dnne09ac8aw zy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in sgczshp sss51k 8qi4+b7j), 0+jhyvdseries with a 3.7-mH inductor for a resonant frequency 5 i j 78gdsss+hs1spy,4j zh)vc0+qk bof 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 plaxspftk0 m ,wd. )fo3d6ced in series with a 30-W resistor and a 40-mH coil if the resonant freq pk,f3.sdo xd0 f)wmt6uency of the circuit is to be 1000 Hz?

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