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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic5/(c fh)s*cl u odudn; 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 hf x*):i5g g7er;vrhlthat 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 coilz1 war 4vb,9g7 k2a*yokdu;j b produces what kind of change on thda1or ;*9,bjgzab2uy74 wkvke 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 produces whw, qtk;zuk jvrfc 9-u)nd6y6 +at kind oyq96r,-tnwcv +) fud juz;kk6 f change 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 wq9 znigdb)3;b:l ac+ mhat kind of change on the inducedm;+zla3b) dgnc q:9 bi $emf$, 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 maghq/: h9o wa6zdqzc +g7cu )y.cnetic 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 currb whiaz9+ mfu)gkjs7i9j*i:-ent in a conductor will be that which tends to produce which of the fois*7afihjb:ij)k-u9z9+w mg llowing 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 bla,oyt x(8 qr(ar magnet is held above its center wx 8y,or(lat (qith 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 ho pprg/n 4g;tvvi31 wq 7(gmm1mupq q4,rizontal table. A bar magnet is held above its center with its north pole point;g mni4wgp7g,( 1urp4mtpv/qv q m 31qing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region nhsme493ov c5 r8o-id-zp ef6 where the magnetic field vector points straight up. The mag o zvm8rdn h6oepi 9e-sc345-fnetic 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 the magnetic fie q spjev k0;(b63w.o 5gyhjly1ld vector points straight up. The magnetic field suddenly grows stronger. Whene( b yl;63sy0wohvkgq p1.j5j 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 i*t 3e0h 6./ k-jrpeotc tzui6the magnetic field points straight down. The magnetic fiei p6 0ijt3ru- ect*zote /.h6kld disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and cau:tn44sw ( *gwdqr9da :ix s kw:v7zr2rries an ever-increasing current northward. Two coils of wire lie flat9 442wn7wsxr azvuq dg* r:d :(t:wksi on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole bw8o 6i08*xluahz;( f5 pnbmkentering first. As the north pole enters the wire, the induced current will be (as viewe8 8nomi6khbl;fb0 zap*x wu (5d 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 ax/aeu3oxti(; zis 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 rotation i(3uo; iz/ aetxf the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about a* p4bf :hfx i0fv;o3jmn 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 rotation if thefb4 ; ijm*3f0xvphfo: 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.v5j58l/a3nffp zi tq3
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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 87/ psuq/mucq* gqbu6 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 magnet-hr3 iqbs: 8foic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is me n7m7 j3 reblf60 -qz0s5fslioved northward at constant velocity through a magnetic field thz30f0sje7ill -f6eqr ns 7bm5at points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant ang8cspccc..rx 5ular 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 transw+w g0e8(p.8hkel o7/vlmdhqpk r;- kforms

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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 6bb*9kc f5 rp*z0 revolutions each second. The frequency of t5 *b9rpcz *fkbhe $emf$ 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 td5(; 6zdk5v+s0 vv,axhyq hago

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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 tha (pmvh ,7(ukh+eydnv6d1a/qs t

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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 secondarydg art* n4iy-n1yd( 4w coil contains more loops than the primary coil theyiyn4t1(gdr*w an 4d-n 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;jreoy iqij-o2x si5)y6j2i: primary coil contains more loops than the secondary coil then qeyi;o-j)2siio65j2 yxr j: iit 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.enx *jvxxm4v s0p39m power 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 resonay7 ppc4 wag9v+ ap37khnt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of ndzh3v,c nn 8-constant terminal voltage. At the moment contact is made with the battery, the voltage across tn,c z38v- nndhhe 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 w 3wrvyi9b,,u+/qc gnconnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, tcuvwg +3b/,yi ,wnqr9 he 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 inducta )d b8:kt y4.rauivi/bnce 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 res h.o (1d vn51le)ilwrjistance 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 q31jwx p9 0bwuconnected in series to a battery. The time constant for the circuit represents the time required for the current to wj0q 13pxbuw9reach

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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 irhlh k10zav9 fw/s6w2ms+x 4mn series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit re1vs+0l s6 mxwmwkr9zh/h4 a2 fpresents 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 ub3o. q/*p mpjt 15yhwhave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to a/ysq/wr ir 1dh;c(8w kn 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 suovjx0a. / tqamh +-d2dpply. In this circuit, the currenxdj+/t v. a-20 hmqdaot

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancebwh z g78c78 6s)ekvue in an ac circuit changes by what factor when the frequency is tripc6)zh7 7 8geskubewv8led?

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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 dk) c0kb4uhd zf 7o(w6koubled, the inductive reactance of d kck6k u )40(bzf7hwothat 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 voltagcyi v)tmg8nl +rl3ru3 9+r+ uxe across an inductor approaches zero, the induct+x 9 r8trn g)++yui3 rlvu3mclive 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 supp4f1uq7 w9e.o1niaotk7g +wer- f z/xnly. In this circuit, the current7z.f gxk +nuweow7-fq41a t1 io9ren/

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactaxnb .gjp;cf.i 85q m;e;mpj-ince in an ac circuit changes by what factor when the frequency is tr.mb5gicf.jen pp im ;-x;8q ;jipled?

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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 voltag c9hvkz+,bx -y(d faq*e across a capacitor approaches zero, the capacitive reactance of that capaciv9(zfxy c+-*hba k,qdtor

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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 besa 3bmq5w 6i*)sqo: oho6k 4putween the voltages of the inductor and capacitor in a RLC series circuit? o*66aquso53h:qs4w b o im)kp

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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 r)5;m ualyb 1qRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R in y+ kg)sp(tcq:py+n .vcreases. When )+pv.qts:ykc gny( + pis 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. Theco8i +wp.ay2, mtyqla4* uy:c 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 series ci2wrz75s ,bwe( u+) h-qujhoucs +utu(rcuit. 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 +qx/3jb16)yyxwf tk e capacitance both double in an LRC series circuit, the resonant frequency 6y/ qx+j)ywxkfbe1 t3of 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 applied voltage. Alfeh- zz0jh9j7d s+*mt 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 circu-5q.zhbwwq 7 purj3xyr *) v1uit 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 radic: 6wcnlc s* ;k2dou/pus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pldn ps26kwcc/o *u:lc ;ane 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 rotatingq8qvxa7v4ox. r ij8)p in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn .oxi p7q8rq8vj4v a)xetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2g 1l jfynm (p9x11l3ir0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an almj1i 1gplxfnry91( 3ngle 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 adgkmi2v-dm;a 9wum m-wy1*6ox justable 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 fvw iar/s0ad z66ixfqy6 fn2 *,rom $4.0 \times 10^{-5} \; Wb$ 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 wit(6y2 *wyy0; 8hg,mwslk phpamh sides 18 cm. A uniform mps*l,6h2wapy mm(hy0y wk 8;g agnetic 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 wirehp3xl: 9 8e4qfxq t)rq with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and abm8h)lfi 7 *ip 5z ce0tzvk;8frea $0.20 \; m^{2}$ 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 he3:0qrbm rm p4orizontally at a location where the downward component of the Earth's magne merpq4m: 0r3btic 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 angular velh m5u.f96 ot/ s5j*04ur pwapbkj6 srfocity of 2.0 rad/s about a vertical axis through one of its ends while in a c65fb4fjh. /kwup t9j*a ruo m0 ps65sronstant 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 cross-sectionaw9 p s1dbzc-1j-ssi 5al 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 turnzb)z8 ;c/lt dzs 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 arx-8j h 7l4gfub(yg+ wwmature. 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, -wgjfy gb+u8 7whl (x4what 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 orc9:yp7a (l(0mb+gzo9pgywbf 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 generator with an output of 12 V1bqc-6.g0a)ya o- d gkw(n henu-bum 1v f3e7q maximum when rotaten.d6bfh -nbewu17v-qgu gke)cyo a0a3m(q 1-d 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 g9l9o itb-*efir ,be 8denerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have az59qvyepkxr 4 3; ;zip 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 p02 ftcjku jkxi9e73) a resistance of 6.00 W. The motor operates on 120 V AC, and whetup2kxkc 07i)3j efj9n running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-Vefs+z*(2 kiuo power supply. The operatif+zuk(si2eo * ng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected* kz xg,(* -gik/gopqy to a 24-V power supply. The piggo,*zk( xykq- /g* operating 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 power supplyd+13 vhn w r (8cu/sa98qd5zruyf: vda. The operating currennvs ud/ dh8:8r5 cz(rv+a9qf ad31y wut is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is nee dows*bzxn-q0iyc ua *k5--o0ded 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 to flow in thp a/u.;vywks- 69k c s*t ztf:ojz7)nqe secondary. How many turnunkz9j6)vftsatcq /op- 7kwzs*:; y .s 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 necessaods:jt+4jago dz88 : hry in a 110-V primary if the 24-V secjsoojt8h4d 8dg za: +:ondary 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 a/o *3yj9 8cycv .imfyrnd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the pc y*/rf89v .yy3jmciorimary?

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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,nn ;ujs l;e7 a;eyoc18s/hti in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in n yj ,tcn;1;s/8oi lea ;sehu7the 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 provide pz*:ht6 *qgmbs 7500 V at 10.0 mA. The primary coil operate h:z6bm*gp* qts 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 primn.(ca7f 5xl 4q;nm kusary coil and 300 turns on its secondary coil. If 120 V at 2.0c nk 5(q n7a.l;f4umsx 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 sojvt-w84n+g u qn78ln its secondary coil. 84+8og- wvlnu 7qt nsjIf 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 a/+zilsi99i6tx v8 j yhas 100 turns and its secondary has 200 turns. If the injv9s tlxi6aiz /i+y89put current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hax* .kp rp1ib5ks 200 turns. If thep bixkr.15k*p input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sect:ypq-j)a t6 bondary has 200 turns. If the power input to the primaryt)qpa: tb- j6y is 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 st * 1up/g/jbynxzes+n 3hu4n :wepped 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 secondary if the pr nbs+y:1u/uwpn3n */ez h4jgximary 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 volttiz1 *c+stu;j jc:aw5age 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 pows 15*zt; ujcc ti:w+ajer 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 ixrw)9o8qtq */. ouo-lfd 4r ,;tkfdp ms 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 iw. p tuoqrx9f /o,d4 8d t;*rl)ofkqm-s 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 ,-d6bvr0f bq wqo)r6kkm long has a total resistance of 0.60 W. A generator produces 100 V at 7qk6w)0 drq6,b-obv fr0 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 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 of 04ksc *bpd de+crq0y 6xg*y dt t2g9h2..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 2qd *ycsyd92t*4. x0bh dg+tkpcge 6 rtransformer 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 1000 V. How much less power wt2+zdp, 0;0c.qgplm l lxeh i*ould be lost if the power were transmitted at 3000 V instead oz x+ ;hcllgmp. *,2e0 qtdi0lpf 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- x rz1jpae bmnut+/9 c.a,a3q 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage muut,aa1xq aecj m-+3pnb ./r 9zst 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 enei)ewt;gh os:4fo. ah*rgy is stored in the coil's magnetic fielg:*oowie hth)f a4 s;.d?

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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 con)3fm+a 1 hrmlo7wf,frtains a 6.0-W resistor and an 18-H inductor. What is this circuit's timeo+ rm3ha71, l)rfmwf f 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-)nnxcjj hq 7s2c y.+v 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 th6+:kf:(rf*/jexzswo s c pjb 0e peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of ths vnd( c oe-izj8a +z mc6jch3543twi)e lachsovc( 5izc3in ez-a8d)4 mt +6wj3 jmp?

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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 aymq+q v7 i9h*p5ol4z yc power supply. What is the peak current thro+7 qyqp* 45l9 yzihovmugh 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 supply. What is th3hh1 ofz 0jx*ke power dissipkojx* 3 h0fz1hated 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 50-W resistor is j3vwc85:ytkmk / *dzp)1nmoh$I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 50-l umt(o5bcco2xee 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 r:g;ffghmw ;9t sruv19-l l1jlesistor 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 d7pth wp0g*+m lrg5/linductor 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 reactance0r-7mo 0kz t0qyn2q o9vj(zf3 sx /yhj 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 ind; xfp*oxm7zsv/drn(u t(ca2r,)* u ipuctive 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 inductivn0-ufn8)c3 h kb 7wwjze 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 induqlgk2h6y. s 0ictor when 120 V AC at a frequency of 20 kHz is applied to itghiyq6s .0 lk2?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz so5m(kxd,b+ecyr w 8)jc urce?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHa6wi h7c*dnihx.1* yyz?

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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 at 10mh3/7v snh;bu ivh( /w 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 12 *0/anl3nxj2,cl iqri00 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 capacitor be 100 W 4,pm x*:fblomb mfo4: lxm,p*?

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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 capacitorv;.8 jp6fg wtw 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 cj l30) 9fwnnipircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive w9i3pl nnj)0f 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-W resistor, 20-mH coil, and 1.0 t:kl 5arty*baz,2r *d-mFkyzr:t2 b5a*a,tr *dl capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, t0bbg i )eyrybi956(ps ioto1p5 h. k-20-mH coil, and 1.0-mF capacitor are connected in )oo65r(iy9 btbbsk gieih. 0py t- p51series?

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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 serie s3(l:hene(uefh s,0j s with a 20-mH inductor, what is the impedanc:ej,lshe3f(h( n 0e use 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 inductor, whag+ ct-m:yc77ntf :1tuso d0yft is the phase a-fn uttc 7+0m1foyd7 y cs:tg:ngle 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 seri p pw,zkgu/uxo bul) u+t9,:n;es circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 n pzu9luug:,+tb) ; uwo/,pxkHz?

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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 capacit w/ 2bz q8tid,fmtvv,1ances is needed in series with a 100-W resistor and 15-mH coil to geiq/8 ,tb1 wvdft2m,zvt 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 inductolaq naskv ,y2* p;h37pr at 5000 Hz for a total impeda 2yhs*klnap a;3pv,q7 nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1yops 1qn r-1)s.0-MHz for a total iyn)-r sqo11ps mpedance 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. 0ck:n:bdcx*s What is the impedance ac snd: bk:c*0xt 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 capacitor a3kp :s69ei g8r7fzkv ot 1.0 kHz for a total impe 3:r f6g9ke7vok8p iszdance 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 pha;ao.r4rwoyn 3 se angle o3a4o .rnrw;yof $40^{\circ}$?

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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 reimmhu3*c79/jlvwxr - pk1g(gsistor at 1.0 kHz for a total iv r-k m9 7m3wg*c(h1xgjl ui/pmpedance 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)kx,j k6tbb.k*ezc) u the phase anglc) .)xukkk*6,jebt bz e?

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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 resis; +vh4qc)hl7 aulben;tl0h t- tor, 20-mH coil, and 1.0-mF capacitor are connected in ser;ll+hqnev0h bu7-ht4;c) al ties?

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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.y:n e(9r10pht.aans h0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms ce0 pnnsh(a h.:yt1ra 9urrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, admrb 9 )o6mx(ind an inductor of inductive rea)(bi6xomdr9m ctance 30 W 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 angb-yfzinx8w0 dp. qpn pix7hf*/v.w20ayf v 29le for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suw08*x2n 7/0fn dfiv .b2wp-x yq pyivp9zhaf.pply?

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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 wig/etk8 7(gbcsts n. 6wth a 500-W resistor for a phase angle of ebs gt/c6ng8s( tw7.k$40^{\circ}$ 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 = 10eb5oj(c(a3+yw x v9ei.0 mF. At what frequency should the circuit be driven in or e b3e(5 ioj(wv+a9cxyder 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 ik5uq3moh *j5 ut)n6p/6egqw 8vkd x3e n an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powe dv36q5/86e ng5to p eqk)hmu3*kjw xur 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 01kc5+mb wcum$63^{\circ}$. 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. Wha1. v1l:xnbiqjt isvli:nq j.1x1 b the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor fo+8i iqbwovqn , e*ee5,r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, n wo b,58eie,q iq+ve*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-mxow c2 cdr)8n8 ;xb4zn-* ofcdi0dcc*H coil in series?dfc;id 8dx 2b)cow c0noxz4c8-**c rn

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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 ; .n-tla 4-2abgfsht kresonant frequency of 10 kHz?-.4n tfs 2 kgat-bhla;

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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 3.7-mH inductor for aywzj/ .1:pssp (dapz( resonant frequez zp1y .p(a:pw(d/ssjncy 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 hy6d 4a -0dl okum (o5bf-2xvywith a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit l-h a 4(0oxybdf5u6dy-2m ovk is to be 1000 Hz?

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