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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 magneti0 oaamqcy1vo;6 68qayc 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 thfip 2k( di01o04 hrgode $emf$ 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 9.94pto lsm;n.izjs nvq0y4x of loops of wire in a coil produces what kind of change on tp9 x.ty9. s;l4 4z jqo0msninvhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire 8fin+chuwv yt4; *0j bproduces what kind of changejwv4byt*;nhfc +0u 8 i 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 ofdkoylvj6) k/xme a396 change on the induceda/ kx69mvd3joy)e6l k $emf$, 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 magnet.1z4d isa:eo a 1 uzbcs2ex c9bar*d;0ic 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, :hgud 8p i o-;gbs8(x u1qko 5q;zgc m06)xnsythe direction of an induced current in a conductor will be that which tends to produce which of the followxym8ikoq(ns;u8sh-1dcg 5bzg qu0)xp6;g: o ing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abo5s9abu58 ek.r2han.w echsi)ve its center with its north pole pointing down. The stationary magnet induces (when viewed from aban8.92wuar5cb) .5 hsekehs iove)

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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 t:be /:ecj/ramable. A bar magnet is held above its center with its north pole pointing down, and released. As it approej/b:ac er: m/aches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fiel zaw 12rey8 nd+:xoa0kiv3 h0rd vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of th ey+83rw:1hx 02i z o0adakrvne 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 whe l+ 0d.;zdt:nekidt7wre the magnetic field vector points straight up. The magnetic field suddenly grows str.7 :kddzd0ln; et tw+ionger. 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 96m.xq: uhvya. /vcvehorizontal table top in a region where the magnetic field points straight down. The magnvhe xma.v: c.q/uvy6 9etic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a hor5k4slh oy:t3eizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eit h5k 43ysoe:lther 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 throut )z2n*fz( mzocg u3jvtm28f*gh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viemg8f**o zv2z(c z2jt3f utm)nwed 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 rota+22qbfr-hdurzs0+ upq y9k .sted 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 o uy+ 9+-b.dkus z rqprfh022sqrientation 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 isv -)youk ssy5f,.n w0 a;1rqbr 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 of rotationy1n oyku; r-qb 0f,vs)5rwa.s 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.v2 p ;mqh7k0pp fj1(sl
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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 .n .nbxwm/k9 cthat 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.h oigyuh+h0(8(bs/tiqrc6o 3hoe 6. txn. xo 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 inomhri*39n ed. the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make ao3.rh9*e dimn statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular ve3og.m4 ju+zwpx p,4nwlocity $\omega$ 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 tran9 zzgg674s )lsk: tzjrscn0td6tg e:3sforms

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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 e9 o 3mn -flz(*n9natvaach second. The frequency of the o-nl*n3ma(tv 9 f9 zna$emf$ 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 used tr7:u (6q,strj y 8.,tqklwxqpo

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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 device3k/mabau;1d2,kyc wx 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 ac :qr3 p4hz4nbsauxe7:;: e1gh4rszsecondary coil contains more loops than the primary coil the: 4xhe4 4seg:b sazzcunq3r a 71;h:prn it 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 loops than the secondary s*+) rykmhjq mtn y)1*coil then qj*)1y*)tm h+ syk nrmit 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 inpui;f9 f8g ,wrtxt

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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 0o8 j6lcy5,u1t njelwcircuit,

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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 batter1l djxw4 q96puy of constant terminal voltageu d9l6wj41qpx. 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 ideal battery ofne: fp p/eqao:4 0e5nt constant terminal voltage. At the moment c0:n aefp: e 4oe5pqtn/ontact 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 resistance R is connov8k( iqz -b soo1v99yected 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 Lnon tzk,;f;jb 3 gpb5: and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The;9m vv /b5a5rgw h6ebsr d4.ai1cpsr. time constant for the circuit represents the time required for the current to rv;avdserscb59b aw4 r/1.5hi6.gmrp each

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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 t6bfc*: qiur-th yado02+8 rggo a battery. The battery is suddenly removed from the circuit. The time constant for of a*6:ig t-brqdf 2rh8 0u+goycthe 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 unitsyv5:(.nnuq (((awztbyi 2vo4x nr.xg 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;ngwcmzx *y b3,ila( 8m+h8u 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 circuj5m 1*sw m g3vl)+iqiait, the curren 5aw+q3s*1)mvgjm lii t

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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 chap.a )l:fmsgxv)5f l8enges by what factor when the frequency ils :v)af.lgpfx e8)m 5s 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 acdky yd3p-jq-veu (5 n)ross an inductor is doubled, the inductive reaq )3p5n e ukyd(-dy-jvctance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acr47 fal sj to1v5d3,bdross an inductor approaches zero, the inductilvsof4d r7j1 ,a5bt3dve reactance 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 con) x0/j ijfs3ddnected to an AC power supply. In this circuit, the currenf )dx 0js/d3jit

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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 fac2m6w6rxh vse yx+q0* pmh+.fch3lvu01u 7qjgtor when the frequency is tripusl71 + vhxy +3 vufhj2mq q.rx0h*wpc06em6gled?

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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 approachebs68afx1cwv ay k4q*z5+wz e 5s zero, the capacitzwqfb +8azxvw*4615s a5ckyeive 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 between the voltages of the inductor ac8)z v6: zva;rhwtt- and capacitor in a RLC series ciawvcr ;avtz-) z8h :t6rcuit?

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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 cir s*ocq bbrc4j:*qv8k 4cuit 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 increah sc6f*huu951libj :t :vha)rses if R increases. i 1r9c h huhl5j6:)stbau*f v:When 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. Thq;b4 ph*h*nf xp3i2q pe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC serieq2p, -1mfvls wcm:s8ts circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC i 98doi ;, xa55l0jzkn;cldzgf;7qtl series circuit, the resonank8gjd;;ai; l7ilf9 dtlq ,55ncz0xoz t frequency 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 an AC apvld6lrt h f0*zmn058i2i lb-pplied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit ,je)/,,lhrhh7mexjmj39w m xp8wi7toccurs 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 ro0n.jq fek8,qrtating in a uniform magnetic field of 0.20 8q,e.rk nj 0fqT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of r(y ;fbe. g5sd t4jqkh;adius 0.10 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 magneticd5 ;; sjheqk(g.4tybf 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 0.1 /pnj69 1yhi0k ilej-h d1(kba0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thejbal9y 0d6e1 kh j1/ihnki(-p 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 adjustabtr9: a9d s6tt(tbsup)le single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a cow k:2mxlo80k wu8vls ,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 200zyb2i39zyy /q* q-qqv.mk7i skc/8tp turns of wire on a square frame with sides 18 cm. A uniform maq yi y2* 7-ytvzckq/k9 q.38m biq/zspgnetic 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 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 withjm lu(.towqaam 2*7k2)iqs v( 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 anqkilkx us7j3:y7nsxc1) -uv2d 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 loca5qiy mr(9ym(a tion where the downward component of the mr (i9yqm(ya 5Earth'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 conbp6jjrri 8-,x k s yrnc( plxx.2;z,6kstant angular velocity of 2.0 rad/s knr,8s6;6p2 r yrjc. kpxz-,bxi(l jxabout a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a)g:v d8yb lgo6 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 of1 x shlbg1n **/zk-iqm 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 armaturdwa v4:/x4u3az nm(uf3m cku8ecv x- 2e. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum zxeuw vkmuc :4u2/xc3nm ( v3 afda84-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 of0 ;o9dm ezkqg6zevk( . 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC genegksh 9gf:wy8 - m0jt /mq8a-sxrator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. 9xaqhfk8g 0j:wts ym- sg8/ m-If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxzjnql 7 u4z,2foko,,ximum $emf$ 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 ,*3ra*ee5s:rtx i xnq+u4kgw, swn0f $120 \; V$ 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 p2 :.seixl ,uz+ q.d-vujgn 3cresistance of 6.00 W. The motor operates on 120 V AC,. j z,:v dcu+pl.ugqis-32nex and when 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 2gt(/tvhncnse )4a9 7l -geqmr9v q,l W is connected to a 24-V power supply. The operating cur47aqlhlv q tm-,)gve9/tn9r 2gs(ncerent 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 ey11f4dkn* e tf40 w8qnj0lhv W is connected to a 24-V power supply. The operanwfd0n 1f48yv 1e04q*le h kjtting 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 resistance 6.0 W is connected to a 24-V p(*1aw qz jzni1ower supply. The operating current is 1.0 A at full 1wni1j zaqz(*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 prdltzbqr+ m3,a/5 a n9c 6h-fseimary 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;t(u5 i16mkkx vqw1v ci4aid( of a transformer causes 14 A to flow in the secondary. Howmk4 q 5(idia;6xt w1i vu(c1vk many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-Vg60tbi cef28) kjq,di; qe*pz seconq,jbp ie608;z* gdkqt ice)2 fdary 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 coil and a 2000-turn second2- vf +g3k1+j ijnzlhrgvq77 vn99iddary coil. Ig r n 73kld+7vignizqvf- hvjj+91d92f the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effth8 pg yqy*c8: gp-zoae01; unsith1(iciency, how many amps at 24 V can f h- tpi*18se( t gpzoch0ya:ugy ;18nqlow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The(*be.w kfk3-81/d.qk 2nu yjevnxugt primary coil operates on 12*t.j -e u 3ne.f2u8bxy(/kngvkd1k qw0 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 turnstx aoh y( 5/g99fpiimql4 3vl9 on its primary coil and 300 turns on its secondary coil. If 120 V at 2tf 93p4 xaoi5qll (m givh/9y9.0 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 turd *mbsu ; wsp-we.;qb5ns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cu .smpb-du;;qs ww e5b*rrent 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 g0v.qm y-dx/:i)c 4ci f g9acvsecondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the i v/cg xc-: 0vm fy)qda49cgi.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 secon/kjctr 7o3a9y dary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the oc t9/k3yj7a rsecondary 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 turnr 8hf ,3 ygqkeyuic -s:/.wxt*s and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpu/w:-qcfy x 8g *rti.s,3 kehuyt 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 stew -qonuxpbsu) v: .. kg*o5dg-pped up to 4500 V by a transformer and transmitted tdg n.-ovxswbo k p.-5u:ug*q)hrough 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 120 Vx2qmh.7v+u5 bfe4mo wq/ph r (. The voltage is usually stepped up tqh (. 4+q/ure7ob5mmwpfvhx2o 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.

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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 voltagesjlv/ t5 :avo7 is usually stepped up to 4voj s/ :v7t5al500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not 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, 6brjhly 3 yh ,9sotc60bnltgi )as20 50 km long has a 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 wha 0,it93tbcr yj6gon,2blss0ylh 6)ith 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 resistance o8pri9 f5ox9nm3 16lnjmo k:bgf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of thl b6i8np91 f:3nj9 o5 grmmkoxe 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 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 100j*di *43)n2gixvz wfp 0 V. How much less power would be lost if the pwj)ig *xnf 2pv *z4i3dower 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 gener0zkv krlh+ dbl5 (yg8(ator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 Wbvkz yl (d0 r(lk8g5+h. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original 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 9b9:okjx ycn( the coil's magneti9k(y9b j:xn coc 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. Whaa37h v2bz gemc-)*sfrt is this circuit's tra -3)z h7m2egf*cs vbime 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 9lawxok yq:ov3va z6zp)6h+ 8in 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. What is the peak currenb.9jte-/bgp d2fo9di m:taw(x j)rm9t?

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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 outleik qzgus)5/n(t. What is the resistance of the lam(/i)n kqgs5z up?

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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 acbeqpe1l-s 5c0+dapz3lay)yp 34 )x ap power supply. What is the peak currey 4-pep py l)x) aaq+c be35sp0a31dlznt 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 ac power ) g8j/)kvi1 a- kupy0jo6nmlx supply. What is the power dissipated in the resisto8um)pj v6ag y)k0/-ijln1xkor?

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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+ fn hb*+-syy66 cemmm7 c8yhr 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 (j0qplje4gb 0n.ly0 p 50-W resistor 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 resioyr o.(wbnd5 *stor 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. vadyqp;ks (r2+cv ve(me4*4 x0-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 reactanceec x*ltr *39yv of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reacta1 u1euby-:cv(i 9 a/miu x1wjis)qhm4nce?

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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 eunhyo(2 ; wtpt)+d .lW 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 fml8sr91u/ xwwrfn kc8x f13e(xo)3i60-mH inductor when 120 V AC at a frequency of 20 kHz is applied rxsr 1uf8e3n 1xk(/8ofxf3m iwlc9)wto 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 throm,tdmfl7ii0+e q o j5-ugh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitonl(7u yhf rr((r 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 t4y1+r/hi 0fp yfb b3uruxo3b .o have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a td3uv2d8rj6 x 10-mF capacitor have 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 p tvt0mq8b 8a3t8bs:*(jpss l the capacitive reactance of a 0.010-mF capacitor be 100 W08sp ja qb:bt38 (*8sstpmltv?

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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 capacitore7 (j,ipejrtzo dl n7b:6 /b;d 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 inz, c: puor nbbkg t4/e)(.ck/yductive reactance, a,e/kpn)ztbc 4.cg o /: uky(rbnd 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 151zj -woh 8pagrid/zz1, 9fa9 p00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar d/9fzzpzo18,jhwp1g9a- ari e 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 resist.gmgw zji*)xb w4 6 j,hd2ejc8or, 20-mH coil, and 1.0-mF capacitor are connected in s z*im 6wgcg.4hjj2jd8x,be )w 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 sej: xrw;bawb-du3f* ynn2xj(0 duc+s 7ries with a 20-mH inductor, what is the impedancey 0r3dw 7u *csx(n w;+:2ajb jxbufdn- at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series withjx wrnw1fh9rzn)rk -).r 8m,e a 20-mH inductor, what is the phase angle at 1000 Hzrnjh rez-m9f)kxw n1) rrw ,8.?

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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 coite +w3+ps1gid r d4o9xl and 1.0-mF capacitor for a tse9wpd i1+rdg4+ox3 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 il cqe5+ hvhbtv+yg8(9n series with a 100-W resistor and 15-mH coil to get a total+8he+ lyv(q9h5gb ctv 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 4 jlaos8en czxg 9/*tyf 9:4-of50-mH inductor at 5000 Hz for a total impedance of 40009ey -4 :fxs 8zg/la9f j*ntooc0 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 res3gy 5jcs40ie fi x7.7lybe5*cc 6lqyoistor at 1.0-MHz for a tocige77l*s5e 34f 6cy.jibx coly05y qtal 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 with a 20-mF capacitor. What is the kk6 wc(mx7l3 fimpedance at 6kkclw x3m(f7 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF /*0yntb)5 c3ptr:pofy*cdniou4 q u: capacitor at 1.0 kHz for a total impedance of 45 u y bf4yd*tnt):i o/ocrp*50qcup n3: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 series6hxsxa hbpy (wq9;(t) with a 10-mF capacitor at 1.0 kHz for a phase angle (bqxystap h )x96w(; hof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a;g2gq c1x2y* a0rbid b total impbc12qx a;g 2big*yd0redance 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 irav : -dzibd4j9o-i y;n series with a 100-mF capacitor at 120 Hz. What is the phase anyob- -r;ddz4a iji9 :vgle?

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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 rcixwj+ my 2vn/j;7 k)eesistor, 20-mH coil, and 1.0-mF capacitor are connected in s+ )c/j; xjnvie7y2kwm eries?

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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-m0ck-: ybj5vpf64l5 jz-jhf ksF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whatjbkpz4vsfy6-5j0k-jc h5 :lf 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 capacitivw 4oms3 tcp:)ne reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz po:sp wcnm)to 43wer 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 gp4p 1d2kjv: jl;vjd0resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hpj2:d kv1jp;0 lg4j vdz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phafr;1ky5czzuccbo l6v*yd(:y1v+c * qse angle ofvlcb*fdzu y +z*51(cck:vqrc y ;6y 1o $40^{\circ}$ 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 = 10.0 mF. At whatitj/2ov58w h axa1z1u frequency should the circuit be driven in order to have mat115vwha8zji/ 2uoxa ximum 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 with 12f2+:dx mt2bk3 88h(at zvajfo.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12 k+a8(m:xftaov d3b zj22 h8ft0-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 circuit:cz)uj2.goep 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 resistanchsh,jg3j;x k ;e of 30 W. What is the power facto3hs jkx,;j; ghr?

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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-zf t5yotu0 *l6W resistor, a 10-mF capacitlt 6uzo*f t05yor, 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 v7i)gb . mfsb4sx-+ 5mic+tta15-mH coil in series? - x7v4 mmts+tb5i.ba)cs+fgi

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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 capacitor2b7 d-6dmgug/ mr:j2xgpc9fv for a resonant frequecgd:r/2v-d6 jggmu7mpfb2 x9 ncy 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 series w9 .,wbe +ps6g p5pqfhqith a 3.7-mH inductor for a resonant frequency of.spf wq9+, 5p6hbgqep 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 wbcfw63/ -n 8 5 asgbdwc4g1i4cbi.ooplaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000w b.dgn51 cg -woi bo64sbf4wca3ic8 / Hz?

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