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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 magneti86z:p/ okoi,u:dlswr y:olq/ i 0c-nsc 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 indu qn9)5a ,lbee8era5m qction 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 loo(o(yia8ih-ph b9 ,nvh ug- ds6ps of wire in a coil produces what kind of change on the indu9d6y8nh(h-v,uapiisb ho( -gced $emf$, 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 loon,(h9kc5c,cft cm: q mzwp25 hvdy: i(p of wire produces what kind of chan9c5(n pt md2ymkc c5hw qch,(:,ziv: fge 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 kind6k3e pgb2.mp ve40wns of change on the indu sw6nbg2 pkm304ep.ve ced $emf$, 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 magnuxeq0b//6li e etic 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 hby qcd0+ 7- *)num;zip r7sfslaw, the direction of an induced current in a conductor will be that which tends to prod p un0q;)+-z*yrbs7dm si7c fhuce 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 hok:r;dna ;9zc fysi:54br4qn l rizontal table. A bar magnet is held above its center with ;kzc qf 4 ryd:9 n:a4binrs5;lits 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 horizon4 +amq9b 3 kw.vjr4lt v+jj2tetal table. A bar magnet is held above its center with its north pole pointing down, and released. As it appv3r +k+4j4qm l2a9btew.vjt jroaches 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 iyy:9 tlq+ 5znqr*v+frgxm7 sld ().efield vector points straight up. The magnetic field vanishes sudd.fi(*)y5+e qrx9 rm sqlnlz:+ yg 7dvtenly. 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(sxsdqwp*2)nh0k9 5g fh rtn- in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coif h5p( 2sd*g9)kw0sx-nhnrqt l 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 i4vl vx*fc-2 rin a region where the magnetic field points straight down. The magnetic field disappea2lri 4vx- fvc*rs 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 an ever-inx 42rhb1,zo p;2sg xvjcreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed frrh2pz, sj2 ;xv1x4 gobom 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 entering first. Au snp*:hw w(fuh2 c61bs the north pole enters the wire, the i:1 hwb2f h*(nuc 6pswunduced 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 axilo ulq7pf1 r,j9f+ jjrjt,::c .s1ychs whose direction can be varied. In a region where a uniform magnetic field points straight down, what must, f,f j1hsjpu7:l9crc:+o r1.j ytj lq 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 wirgk, 9 g1c6fvx68 bc-ss*bsjr we is rotated at constant angular speed about an axis whose direction can be varied. In a region where a 6f -gkvsbs61srx ,jw*cc8g 9buniform magnetic 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.q ti:-kt)2 . (no(dynomlp)rr
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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 thatayxfj )umy 2;5 an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Thggpfh (;y:o 5 agv0emdx/a;6ve $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved no:ssm 2;wgr m *kp9x,harthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indu;x2 mgashkr: wm 9sp,*ced 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 rota+xqk 5+x pd-;5z fgmov, u,ukites at a constant 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 tran- ggqc54s(t8n) s -gmqvdcf 9wsforms

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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 rb;j h(seg/+// j0o cp (ttxqoeevolutions each second. The frequency of thp(tcqsoobgje/;0x t //( j +hee $emf$ 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 d -r)/mqkkhbr zum-:fu-m.ea6 q+a li+0j p.dqevice 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 that4vs i-22kh;kbl cwt4r

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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 kpn4/9 h *qdhix-irs -contains more loops than the primary coil then it is i s-rk-hi 9* qp4/xhdna

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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 cop/fvm-2xz 6n*h,t zybil then it i-/ x hmtz*nyz b2pf,6vs 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 powqg2)-ns1cxij 2k6 zywer 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 cirqwb.bu223nqa9+ m74l jlalml cuit,

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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 jas*ua/k6 :mxoo uw6q,.0 rq qseries to an ideal battery of constant term*ouo u6swa6kxmqj :q/. 0aq ,rinal voltage. 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 ide 2ep.8ot 9f27k tobgkfal battery of constant terminal voltage. f2 e.827t ob9okptfgkAt the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance.tiv0kg:pplw c u7 zo)0 /3bi,zxic4z 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 indqo1opmb1f h0,r8eo * d1gce t2uctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to (uaib l; ,u4po ;6ttkr*mxd+ga battery. The time constant for the circuit represents the time required for the current tot;glu p+(;*k,d 6o mria4utbx 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 t ahww +bd, 8xqn9l7y/i0skk;dt)3yq go a battery. The battery is suddenly rgl k8sadd;iyt,wk w)b09q/+7 qyx3hn emoved 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 sao:y n ash c.ie e-g)vjx*ufp29bp c,./me 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 su)el jg6jdvi 1y4j.h (:4 umwvlpply. 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 yiw+:r3qc *6 mr6xrij. In this circuit, the current 6xc :wqmri*+3r y6rij

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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 i3pdt 6 v6 -rrymr01mfwhat factor when the frequency is tr01m6td6py vmrrf r-3iipled?

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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 inducti7z6pc q vj//vwve reactance of that induct v7w 6pj/z/vcqor

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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 thpnu7hw-au jvc vc0g1 yx)-:- ue AC voltage across an inductor approaches zero, the inductive-0 -gc7nuhjvp 1wa-uc xvu:y) 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 connected to an AC power supply. In this circuit, the dwh /2)1my7/najgz i usm)1b vcurren/yg/2uw)1) 7j bs1 zmimvhadnt

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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 whe9rezfj0 hg1m m(cwa4xa8k*u -n the frequency is tria8z9a4 -1cghu0x e(m jfm wrk*pled?

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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 voltage1nfa*-kaff l26wj t: e across a capacitor approaches zero, the capacitive reactance off :2fnke6 -w1a*jf tla 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 voltagrc/u,(vt 7nw u8tw6d)nxf m * h9aunf*es of the inductor and capacitor in a RLC seriect*a/dw6wfumtn 7uuv) r8,*n9nhx ( fs circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is d) dnohpvg*7)rne wdmx.(sm 0)efined 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 increi md-x5pw i d.q7ip9g3ases if R increases. dgidi 7 pwpixm3.q5-9When 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 circuitxug;sx *v 69;5 ew rql+6cndfvjsdg 1). The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC serie(c hrzfk3 ap+-x) mq4as 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 capacvc-d jhcwa; -3itance both double in an LRC series circuit, the resonant frequen-wd;c -va3 hjccy 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 cs8vt;p-ck cwv64 -kr an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cirds 23 36ykst7kh8 wviz/x om9tcuit 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 rad lo7 dxt2e6 zet1vc;k7h 06u1cnfnp s-.,clztius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plz12o1cu6zcxet0t77tpv e-. nl;n,l dhf 6ks cane 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 radius 0.10 m is rotating in a uniform magnet0iqmi,, 75mjhc ,czedic field of 0.20 T. Find the magnetic flzem0h5 q,i, dcc,jm 7iux through the loop 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 fxav 4ttp :3a chuez::;ield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the t:;ax4u ha ec:vtzp3: 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 adjustab: k+kn pc-0 kyjelp/f)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 coil changes)5 mkpzu qomdo6b)8 c9 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 x/bgtdj 2+ qsb eg5+8jturns of wire on a square frame with sides 18 cm. A uniform magnetic field 2 /5bet jd 8ggbjxq+s+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 with 15 turns and an ar- +.y6)bshgr/ qh8 fw rjza2wfea 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 and atg-h ..cckw:im9lcla1ir /i6rea $0.20 \; m^{2}$ 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 l v+veqk8:23gkh aoi* flies horizontally at a location where the downward component of the E8ea:o3 2gv qvl+k kih*arth'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.iuxk2* d b0s,ujzeus4x(90 w qm 8hnf)0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one x(j0dqkx e24 0*n)sifzuw8 umbu s,9h 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 cait9kk 9w5u+h ross-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 tur7bbr xaz( 6 gby5o35lmns 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 armatukli7x72jrsah2,yl z2-u d8qkre. 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 rox-hys 72 k lu7aq28,rldk2j iztates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 t07wq vrx9cgkvg:/n6 e4ena 7vurns 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 generator with an output of 12 ml h/aqcil9+vre0a(z6 q 6 j7pV maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availarjl0e ilh/ 6cv +7zp(aq6ma9qble. 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 maximum b8bg w usekv/m tz.2 h(.2e(je$emf$ 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 onu ,9b)mc )jekg $120 \; V$ 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 hava z1 y5i/gn*qk-ji df.e a resistance of 6.00 W. The motor operates on 120 V AC, and when runningg15fak*.qii nd-j yz/ 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 sup8yi6jkroax+ : ply. The operating current is 1.0 + 8 ir:okay6jxA. 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 supply.*eskmcol0 0 s. The operating curckem00 slo s.*rent 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 t+eiti npal 77z459ok8fbbaw z x9:u +co a 24-V power supply. The operating current is 1.0 A at full speed. 9 a8+7bl iwc4k +izt7z9x:efupona5b 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 n p0ttvfbh/ 3u0xu;5 r(ykmt8jeeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A lf /y.:bt/xcd to flow in the secondary. How mbytl//.:fc d xany 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-V h -plj1 * t:ein/iw9fbsecondary has 100p1:/ f -ne9hti wlb*ji 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 2npb9qd75w5 bt )yqi/w4lb(mq 000-turn secondary coil. If the current in the secondary 5w i(lqbw9 mpdb7bt/nqqy54)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 prima7iuln:u8ih)h4y u) amid r8q) ry of a transformer. Assuming 100% efficiency, how many a ma 4 )yrh q)un)8ih:uii8ldu7mps 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 *lsnev (y*66a,sybo9lkq +v4bt6dg h:y e/ lcprovides 7500 V at 10.0 mA. The primary coil oper:**e,sdqlo9vb+cbs6y6v4 k y tnay hel6(/ lgates 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 itso+o/8s3r f9hq bpoe4b secondary coil. If 120 V at 2.0 A is applied to the primary,9 /+feoo438 qhp borbs 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 xy,)0,c x8knv k mb.jfits primary coil and 300 turns on its secondary coilm,)vyxb0 jkk c8n .,fx. If 120 V at 2.0 A 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 secondary8w o p1r1jmw1xs*j wmf+be-q2 has 200 turns. If the input current at the primary is 100 A, we can expect the output wf j1xrqw1s*-mjwo 8e1bp+2m 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 200 turns. If (icjy:; 7j0jwh xvub4 the input voltage to the primary is 100 x4u(;icj07:v b jhjw yV, 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 secondary ha-+7o p2e am ;(zi.z6qp tjhzmrs 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional erhozmjim + 27p p6 q;.-za(tzlosses)

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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 vogvle 2)dd8c) mltage is usually stepped up to 4500 V by a tradd2c) 8lm) gevnsformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually f0d44z s4/xo ks7wr ncstepped up to 4500 V by a transformer ako/zxsc7wn fdr 444 0snd 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 voltage is usually ste,ac,)c: cwgjz 1 l jk;3sna1aspped up to 4500 V by a transformer and transmitted through a power linwjl s s);: gcjk 13cz,,aa1cane 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 50 km long has a total resistance of 0.60 W. A js p th(6urr3ro3/m8s 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 would be lost6u8h/ s mjr(srr3t3po 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 of 0.60c r n uu3gx2tcx3bc* -tse/10p 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 ist*r /t 0ccxcu p33 1-2egbnuxs 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 c2*n :*pk ury*ohwu8a 1000 V. How much less power would be lost if the power were twu* * k8horyn*2: aupcransmitted 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 t kt gd plfeb vx4k 6y.36tfx(87-ut0xrransmitted on a line with resistance ox(x-.bt8k6y3r6ve 0t4xpfu d ftkl7gf 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 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 bg1/b::uhaqistored in the coil'b gba1:u/h iq: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 kl7.7ht-nktza o * 8ly18-H inductor. What is this circuit's t7ot8 k.ny- h*z7ktlal ime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V(xwxn:te kj127bh 5 h3tf+t.amxgi,x?

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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 cu5hatn (hm2ta / v34kkmrrent?

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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 restj8/8suy sh 2zistance of the lampzj/2ush y8s8t ?

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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 power supply. Wlhp*7qfw sb/m,yy b ;7hat is the peak current tb hs7ml yp q*yw7bf;,/hrough 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 v-48fl +evt bgoqw0z:supply. What is the power dissipated in the resist g8leot+-0f: vvqwb 4zor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through ay3w6o9f d:1z(sw fumtbd9p3r 50-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 resbf( zv+eo2cls4 j j00kistor 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 reow,sa agif 3tsm; h8;2sistor 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 *.jiuann1 4s5s e g;lqinductor 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 inductivec4n:x. ,ayzoi .obkh * reactance 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 reacta q8 exb- ak9gp8i1xy./el8 bovnce?

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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 reactazq9hg) 5o s0+ypk :j//pzdgog nce at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequencyz4nkauy/ .z77na2 nco of 20 kHz is applied tzau 7ao.7nn/nk 4yz2 co 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 * km 36o;zkhjyv wy6-n2.50-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 +iuem zj 44uy*reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance a(21elcriyzn, j:z/jz o 4o/lht 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 reactancb 92e4n0+zuysmc 4t qie of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-ws/,,b-. hcx jv y3:ezwuww+qmF capacitor be 100 W/bw:xe,yw wz -wu qhc,+ s.j3v?

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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 capaci1ba- ok *t.ggu(za zb-tor 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 circ4kn zwp. *:cyzuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanzw:zpnc.*4y k ce?

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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-W resistor, 20-mH cs)kjt 1 a0q4c *(jey/m 8sm: wsqq9srooil, and 1.0-mF capacitor are connected in seriemsss8a 9:jqk)/(0c1mte r qos*wjy4qs?

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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, 20-0fdyqm tq+nj7 /59fsglljayi z0-:p.mH coil, and 1.0-mF cfm7lj.90/sz5y0aq jpi+t: y nlf d-gqapacitor 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 in series with a 20-mH inductor, what is the vkiccp +8d b+p 2 nw3ey:uw7w+impedankw :wyp++38n uvi7b ecc2 p+wdce 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 with a 20-mH ihh:d--5,mf muxpv i0b7bmei 2nductor, what is the phase anmx--hu0f p,ivbhm2b:m ei75d gle 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 scwui8g, r4( maeries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W a 4(u,acrmigw8 t 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 1f r( /i; )qgwtwvo 13u:gmih-q00-W resistor and 15-mH coil to get a total impedance of 110 W at q (fghui)m;i3v: -qowt 1gr/w 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 450660bw ktztmcl a,6j 0o/hwa-g-mH inductor at 5000 Hz for a total impedance o -00 w/ camlak6bo66thg,jtzw f 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 must6ei7ej ky(x-r-tvwf u br7s6e za6v 2wl ;b1:m be put in series with a 100-kW resistor at 1.0-MHz for a total ime77 b jz1x s:uvel--ewr (6amwir 6;vfbk6y2tpedance 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 wi.84l jrea cow5h94z;fa+ u.5 kt hikhxth a 20-mF capacitor. What is the impedanch5. l 4cke9jthozifx+wa rh5 uk4 a8.;e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in serienx1 *(opo bbwon141vnkj-: dm s with a 10-mF capacitor at 1.0 kHz for a total impedan1bm-w pvod1 n:nojnk1x(*bo4ce 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 kqwmwvp2 wmg4 be9y7v 171j rt4Hz for a phase angle1tb47rw v7wmmg vwj4qp9 21ey 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 ;l(cly *.uikixq m34yat 1.0 kHz for a total iliq3u *xy.4;l k (imcympedance 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 120g;j a+m -zx1dl3w.2 vej.2iqm3tdb, hshrw 0j Hz. What is the phase anglqw jz2 0 m.-tse;ar3 mlddg3h b j,vwx+hi.1j2e?

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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 5a q hhs4(4ah;e.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci(ah;4 sah q4ehtor 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 rx6zoy ,0)dxtotn s :6lesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, ,lt)xoxt60 dszyo:n 6 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 capacvj8x.8jvsvm9r;4ep u 8rvw 7hitive reactance 30 W, and an inductor of inductive reactance 30 e8879wvu;x p .v 4hrv8jv jmsrW are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLCq *b:sf 3o 5cv6orb9fukoi)h5 circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.46b :q*5co orik5 )sfh3bouvf95-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle 3o3oig+cmhpa3 xj 0m 6ofgpcm3 oo3j3a0+ hixm6 $40^{\circ}$ 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 f5f )3v gyqg9-t;i wi;lgd ku5R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order luy5fdqg;v;iw9 ik gt3g )-f5 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 with 12.0 W resistax c4;vhys -*qsnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplxshc-sv; yq4* y?

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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 ACeo, )9gdyf;hwrrh8 y , 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. What 6;ktk2v 4m1ea b(bems/8zynu is the power f/;z y bmmbk8un42k6sv 1taee(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 bto7)ox2 nxfbyisxi x8 1cd;oq7+64 fseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 7o1fi6o+oy fi xxb d2cbn ;q7 sx4xt8)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-mH coil in series;bh6;ogqs t 3d?h6;go3 dt; qsb

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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 resona;t6z3q xekkq ;ztqsa83m 9p y.nt frequency ame. ;q336ttq ;k y psxzq89kzof 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 w(b:x 6c dsul qc2cijduxsed-t; ,80/fith a 3.7-mH inductor for a resonant frequency of - dl80t/ 6xcdfcucu:ie ,jxss2bd;q( 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor anu9qys qa1sj7)tw.2 nq4rw al6d a 40-mH coil if the resona.sqqw7ta wju) 4 q96sa2yln1rnt frequency of the circuit is to be 1000 Hz?

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