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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: 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 mag x z83vnl1qa3wyeot 14netic 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/ 7f-0m:r:/sw sgnn a.j vn3mhcu9ftz 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 wire in a coil produces what kind of a, j,df, hb9lwchange on the induc, d9fa,lbwj, hed $emf$, 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 bheunth) v*lcq ,( tq/5v+.rc field through a loop of wire produces what kind of change on the thcvnq t eu+l hvb/,q.*)( 5crinduced $emf$, 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 wi wn; age+;yuq44nb)tvre produces what kind of change on the inducg) ya w4uenb;qn4;+t ved $emf$, 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 k md f1f:1sp+cfrom 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 induced current in a cof7+v jyasc. x+nductor will be th7+sy +cxajfv. at which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizek4x0auvar2:l*+ 1j+ssoie sontal table. A bar magnet is held above its centerjlkx viesarsu*:10s+oa2 e+ 4 with its north pole 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 magnet is held above *gpj+m9gl s3yits center with its north pole pointing down, and released. As it approaches the coil, the falling g y+ 39jmsg*lpmagnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector oqa)j3rd 5 )9mzi9fx xpoints str3mx 9)roqjx)z9 aid5faight up. The 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 where thusbj; 7p0er+lj8 4tjve magnetic field vector points straight up. The magnetic field suddenly gr;+jl40 8 tesvbp7ujjrows stronger. 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 horizontal table top in a region where the m9 nstz uvc1:n9agnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, wha9z sn9vu1t: nct 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 an ever- nxl)qj/k+;rv;j 4b tiincreasing current northward. Two coils of njj;+ );qkrlt/x4v ibwire 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 thm c1an0t;xr u;.dmf w4rough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewe1. fum4x;t; danrm 0wcd 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 jje+cr) 9 7.i+d ajp4wdnurgiz28 l9g rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis ijna +dggz ju cp+l9e j2)74wr9ir.d8of 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 spp a.u qx2j-a 2xtw8ts*eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down,tpajtx 22*sqx uw -.a8 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.g2hc)7fy u p6z
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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 afg viwjt9p-z1+v u*ilew,0umr; l;s.n $emf$ 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 fielxl ue*-f8u;ft br.db *d. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is yco +3g;yz n98.q jjdkmoved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.3n koyjyz.8j9g q +d;c

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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 velo0:ke43gj t onzttta-40yfk4g city $\omega$ 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 trjz2 cz+vhnw3e l62rp+ dhu0.s ansforms

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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 secondikr(b0ms5lou o soy6-r . 45tm 5,qtki. The frequency of toq0o k4t rm.k,u5s5m5ibiy ( ro-6stl he $emf$ 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 gsa pkxeq7 w 3qq5+ ekm0i;+ sp68fk1aused 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 th aaczhg+1f;wi/2xw-e at

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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 cont; 0bp ebn,zs)hains more loops than the primary coil then it iebb,hp) ;z ns0s a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than lgn hr/en7h/3mp pt2-the secondary coil then itm n /n7lget3r-/ph2 ph 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 e0:pxv, lu 7we+vxzcg0;(so2b:ex)jvm: r un 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 cirwr(jo*k+,br+;jw6 -.bjfuc nl5 qgdacuit,

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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 batteryh ov2t:,m6e/eaq+(q3tz utub of constant terminal voltage. At the moment contact i ze t,:6a3/+ mqtqh (uuv2teobs 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 serief+x1d8h dal:.m9k yg 3i y4dsns to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vok9n h1fg8 l 3ay:d.xmiyd d+4sltage 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 1 c3d s6 il5rch(ye+assb8 +aewith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancb9vw 9qs2 2bdne 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 lz wapl89a+wi.p*pzjjckig003ue 4 8 are connected in series to a battery. The time constant for the circuiz3a w ip 8cpp0a.*l4k+uw 90lijje 8zgt represents the 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 mt/jp 7wvnnt9k nu/(2to a battery. The battery is suddenly r/9tv(j/w7umtp2 nnn kemoved 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 uneole(f)mst t(3 5 jc.cits 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 tqchyqe 35y-(vceoug:xh) o36 o 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 circ 5zn4i 9f ntqx ;rvvo.iqy435 j2nha6zuit, the current;2f3v 45nixnrz.ti q 5q96 yjz4honva

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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 w3 u(2jkes -/s,hzxffk hat factor when the frequency is/3 su-ej fx f(k2h,zks 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 w;x t86spt.la xop- 4dan inductor is doubled, the inductive reactance ofo tpt6axx.;l4p8 swd- that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an induct.li:de tjm5e 97 6fi2omu7 lstor approaches zero, the inductive reactan5.is9 d2miu6l ee omt:l7tfj7ce of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the cmc yyw:oo+g3l;buq qw /d4zm bnh069.f3we +uurreqwh+m9ol /wof:.q0by3 3+4e mu cd b zuyw;n6gnt

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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 when the (n1l3:-+wj 5 f-6qh*dcsfwslq-jgxtb *zcbb frequency is trip w j:s-3fslgl*c(znqhctb-5q*b1 +-6 wfxjd bled?

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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 volti vk35uhn 7 (l weo1/6znc/4hhd 4eggjage across a capacitor approaches zero, the capacitidnvgh il63o47 ezcwkj/g 4(n5e1/ hh uve reactance 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 bet6 xt*jmr,wfy ml)s07 pween the voltages of the inductor and capacitor in a RLC s)y0* 7 j lt6wmrxsp,fmeries 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 jvq )s jipmv xj96:nptid*h /l5me(+, 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 o0f f,ucj02 t r0f6m8vsxj 7+bpcfyq1if the circuit increases if R increases. Wh6078 f fc0pc1rq mbysu+,f jf20jtivxen is this 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 iaehtkph)a;v. x0)cp 9 v3o nf9mpedance 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 circuit increasesi6k 18f1dbhruv :zs8l g qb36z 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 doublpo wv1lwe mw+0.6b bl 26e8npcye:kg-e in an LRC series circuit, the resonant frequency of that circuit will8+b weg:bl- l0okww2e.16m 6vce ny pp

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC m: kl*+.jkpgvv,)r i lxlp g83lunh/517xrm happlied 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 circ.n8-ap9rv tatuit 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 uql/m t z15*;tluxh46k m9 r :uluz1ckgniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paralle ct6k: 41*l mk/ 9urgl1zquxzu5t;mlhl.

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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 0.10nfqi--1l:pqc 7:rvm jv+3hcv m is rotating in 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 are perpe i-7fcq +v jmh3vc- v:pln:1qrndicular.

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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 iif 3 ( i)twun p6x-q7-euey)3m5rv nktn a uniform magnetic field of 0.20 Tnr7)p- quyue f) i3x t3mkv5 wi6(e-tn. Find 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 l2hrl( 5-6u:zije02ck m . aiaox2sjg zoop 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 cosvn o/ zoadx*n,r,9q,w jvu/)il 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 frame jxb.x7ob n+ht;(qy8i r.z ib,with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the averagh8qbtnobyi;zr x b..ji x,( +7e 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 tuq9) m4zifgb)oi.aaa k4/6a njrns 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 an licdsfldr/m 6 :3w26fd 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 at a location where tl or-km.h48zp he downwaz.o 8lrm-kh4prd component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular0x20saxj:l5 -rhnt xc velocity of 2.0 rad/s lt nr5xscja02xhx 0 -: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 aj(kpi4pe2 o y/ 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 consisfgba9lr; 5)y3tt s 74sllij:m3bgq 3 rts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop i;kv(ypw- 9dlj(f*qf ts 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 9-f t q y(dkf(*wlvp;jwill 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/b4lhmk l6 fpbbh0cn. 6(pz a0 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 construct a simple AC generator with an output of 16;kc ;odlj/0u iauy n) i(fx/x2 V maximum when rota(6ynj xk;c; i a)i/u0xd o/fluted 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 wiqaahmy a e:icp3c3 w+fd614(hth 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 motolvz ( h0 f.5jkcy:xjdlcn )3j2r have a resistance 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 DC motor have a resistance of 6.00 W. The motor opedbuz5- whr(i* u:8 sq6wgm(bg rates on 120 V AC, and when runnu 6r hzw(-d*ub:gm s(gw 8i5qbing 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 y/r .r wa5.b qavhhzk,(h t)u,supply. The operating current is 1.0 A.rqhbh v,)r( y..5thwzu, a/ ka 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.)vdu 4 -dk2skb0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whavb42-kdusd k)t is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is c q0(z 7kkribld -+p 2ayc- c-*v4btfcconnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac2- a4-itk 0 zc+kbd c b-7y(rvfc*qpclk $emf$ 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 k6)i1*ubijky;kn4 : uvxp,z8 pw 7qtmreduce 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 primar78tz seqj -dr5y of a transformer causes 14 A to flow in the secondary. How many turns a z7e85-dsj trqre in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V p;5p kr7x pk:qg7)r oui*rizz ha00l*u rimary if the 24-V secondary hasi 0klzh7o **pr ku5uzri:pg)r ; aq07x 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 c;j/)6 p3sn0dhkeb 8 hs 6v1nxvacmd5xoil and a 2000-turn secondary coil. If the curre)h308kn1xpdv 6;m/ j shbv6cse 5axndnt in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a trans1iv/;b c(3bt qrl- f;jnt9wpf former. Assuming 100% efficiency, how many n3bj ; q vwltff;c91irp/(-btamps 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 750 2:; 2i gxr 71nskepcj8lju,bj0 V at 10.0 mA. The pri e8jxlr:jp2bkj1nig 2;7s,uc mary 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 qb)s. :w,nf97:8 cqkejuy+w skl) wkdits primary coil and 300 turns on its secondary )qs:.9 l w)w,fbn8js ke :quwyck7 +kdcoil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns o,(bv ib v2v.t6pe3 u,d vffso+n its secondary coil. If 120 V at 2.0 b udtb f,vv ,o(v6 2.v3si+fepA is applied 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 transformer has 100 turns and its secondary has 200 turnsc5bey8c qmxe3xs b6+5w1+g- tsz, sod. If the input current at the primary is 100 A, we can expect thes bycg,53w5ob s8s c1q-+mtee6 +xdx z 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 has 20x2j7fz0 bm+ar, smm*qg -/h g/fxw fn/0 turns. If the input voltage to the primary is 100 V, we can expect the oj-z,g2m//x0 fr*x f7bm+fa nhsgmw/qutput 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 turmh8dw*c5 b+llnya wj mu-;hxw42anni3 8 /sj0ns and its secondary has 200 turns. If the power input to the primary is 2cal8/8bn mwu43yi+xw0 jjdl nh*was 5 nh;m-100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step6y) 9r(lv0 po7h.or gsewx:fhped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secos: r6xo p0hf( yr)gho.7 vewl9ndary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stek jtu-wd) uwr +50gdij9c15g epped 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 transmi) -iujgg 05rdk5 tdc9w wj1e+ussion 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 1 c/ 3*chstcohn,w /6lk p2o,sj20 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 lost in the transmission line if the voltage is p c ,tc2 nck,3h*jo w/sohs6l/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 50wex6ti3zq:pk vz.u6 3 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce etp3.3kq: u x6wzvzi6energy 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 apluwlkv(m hc*- 6n 8v5 total 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. What percentage of the original energy is lost when the transformer is uvwn(c vpm58l hul6-k* sed?

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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 pov. 4l8,x 5sowrq3m7t iogto1 iwer would be lolv 4t78i qo.im,rs wogx135ot st 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 at 20 u duf3+-u:un)b 4tp qxA. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up wt :bu4) u+qpuu-3fxndith 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+bffcpo+ 6q i(;sz+yu 5.0 A. How much energy is stored in the coil's magnetic fieopsq;c++ fy (zf6+b iuld?

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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 resist2 vgbojrzd..m1gk- hw13t 7w zor and an 18-H inductor. What is this d 7v-zgb1jr3w.hw.tkzm12o g 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 inyw gj.( a8x7:djt+o cg an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wy/s8ayu(0f byt3.u cp hat 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 resistaxa(471 jzp cgince of the lamp?jz7 ia1gc4xp(

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powe71h/dpl qo e.+frl,pd c5cuj5r supply. What is the peak current5c, /or1lch+ jf. pd75dlupq e through 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 a9 7zlv,tfd; cwc power supply. What is the power dissid;vwz9cl f,7tpated in 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 5yfn3wx7y +z(u;vu/cs0-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 resis86z n mqfh*ts0tor 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 resistoocwo2 ra5 3r5c8oe gt0 9*vsy: ab j.6sgws*zrr 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 *y 9g:muxv-7 sorop+ za 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 2.50-mH coi8gip l 11lbzts5gq*y 7l 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 inductiv*uvt w py bl50pq06t,oe 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 inductiv(ums()(u osi l ,)q uyr9vn;gpe 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 5tscr: +msbn/nas4(x(u w d0f at a frequency of 20 kHz is appliedbf: ssxtnau45s+dc (m 0 nw(/r 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 - 7b8 xalt(b c q0g;;l*fkwthwa 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 .9* ufyh3o9cptdo q3 aat 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 5r+rv -p m:l/+3y vdejfex(d2 s0 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 of 1205g;rk a1)riffliez 19 0 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 cap p5za0;ny.ekpacitor be 100 W?; .y5p ekpzn0a

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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 andl qmv(c/ 7tf,j 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 n8j0g8- clk:k b 9axfiwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacc9k g8xf8j- 0ki:bln aitive 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- yl.4zm9h5ol4v xdpu1s3a;ptW resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieou14vyx5asdl3 .h pz4; tp9 lms?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH c/lcie)t.z*7ac+ r dyhoil, and 1.0-mF capacitor are connected in szhiade+ c 7.ly/*ctr)eries?

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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(wojap ;(u *vv a 20-mH inductor, what is the impevujp( a;(wv*o dance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected isqbt ys)c8pwci , 9q,;n series with a 20-mH inductor, what is the phase angle at 1000 ;8ispc,wqb y, ) 9scqtHz?

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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 20llz:z.dz /ln x+,*a yc-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 y.:,z *dxl lza nlc+/zHz?

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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 s yhn4*,*hjzg capacitances is needed in series with a 100-W resistor and 15 zyh n,s*g*hj4-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 5 soe, ix 1r-)xbtd;5w)ejdgq.000 Hz for a total impedance of 40000 Wqxdt es,w;5io ))-dg.ebxj1 r ?

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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 a tm5 bz ;m)cpkstzsiev5 t6w g b,7zqn4-4aq-*ootal impedance of 15mmtqbb4- snap,qk-i75z w6e5c v)*4z sgot z;0 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.;c :d dyi,pz-3wf7go;kzj5c pkcc :4k What is the impedance at 10;f:-y7 pck kwgz;:j doc4czipk c,53d 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-msk pnht,osiwr) 1g o t21(9:tuF capacitor at 1.0 kHz for a total impedawig,p1rs 12uo:h(t osn 9ttk)nce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a pz0qglv v d.m2blin,,j.gv04f hase angle il24fv .j,,g0gmbv.lnqd0 v z 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 akuseuhm-5iwf5 ) 5y -kym.te9 total impedawe yeh55smk) --kmiuuyt f.95nce 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 thewky5ub*4 w) nu phase angle?b*yn 4w5uw )ku

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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 ar(immro:i+x. (n4/r(lzl tyax zl*i, nd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap *+li.i/i(tlr mzayz4(mron(, lx:x r acitor 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 resisto-up*lh0u v ,ps6qb5azr, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connep ,ba0us-6lqpu z*v5 hcted 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 capacitive7 4ugbix7 3 ezpwru2;yn0wc /b reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power soupewubz;0/3xc 24ug7inb r 7wyrce. 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 R k y;e)oqqfp6.c4gy5rLC circuit containing a 50-W resistor, a 10-mF ca5rec q ;6f)gy o.ypkq4pacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessm9g xyc)2 zhirt4hgaun 8p66 6ary in series with a 500-W resistor for a phase angle of a8p 9hux6ciyzrn 62 )4g hm6gt$40^{\circ}$ 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, C )k ,q2 j,d7 e8:md3lfelvlnel= 10.0 mF. At what frequency should the circuit be driven in order to have maximum power,l j,edfv2 k3)elm 8l7:qld ne 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 with 12o3im;;scu 7mg.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pou; gmc;s7omi 3wer supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is s 8epw s: q:.kwq*wx0p$63^{\circ}$. 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 imped+z :gxa:gfm z1ance of 60 W and a resistance of 30 W. What is the power fxz:zfmg:1ga + actor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, a qvakgs5o; qc- qh6(:c 10-mF capacitor, and a 0.45-s 5o:q- acq( vqc;gkh6H 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 in seri:vk:1jbx a2h wiwbe5kv;v ) -ges?wjwkv;1g::5i2bxa - )vhvk be

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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(o(c ,zfzgww2smv-r9 6 q .w7 )dcfihz for a resonant frequency of 10s 2 (ffciow6g9zzm(z,r)wd v7 w.c-qh 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 series with a s -tcp,f;1ha s3.7-mH inductor for a resonant frequenthsfc;sa,1 -p cy 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-Wq jc*hw(r2w g/ resistor and a 40-mH coil if the resonant frequency of the 2/gw*j(hq wrc circuit is to be 1000 Hz?

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