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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 magneti(mxgkn1 k.v h g5:qjh aw.0a+r8 zmu,tc 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 stybt9,1a hdz86k kn yiqn7xx5 lw. v-3iates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kin7v/(wr.um0 ruxfq7y fd of change on th7yu q/rf07wum(x v r.fe 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 thrs9 x(0y31td4suwgb hmf5fl ,nough a loop of wire produces what kind of change on the st4ff xys 5bwugmh,d03l1 n(9 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 of chan+ ,vv p1fg8oyfge on the inducv o +vg1f8f,yped $emf$, 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 r8umhr:0p o7 /n v22d q.ipmnfmagnetic 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 du8h +lto :os6k8wv* gt f .zgdc1zvh86irection of an induced current in a conductor will be that which tends to produce which of the folo.v6 :l8 v8z6*h 1+chtw dgsgufokz8tlowing 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 tabcj-dgy s*tm883 pf (zvle. A bar magnet is held above its center with its north pole pointing down. The stationary magnet indu m*jfp8yt8dv s3zcg -(ces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abov 0xf (g-gfw9j/ywz vm19ty z;te its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vi0w-jtygzmfz91 g 9; yw(x f/tvewed 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 yxs5x.i5)a fw where the magnetic field vector points st5.f5sxa y )iwxraight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in w3oe-arv++br a region where the magnetic field vector points straight up. The magnetic field suddenly grows strbrvo er3a++w -onger. 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 se r7gbx,u7 -t1)vbaqa horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disapp eba7 -urt,s7v1q)bxg ears?

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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 w .)3qb/.xslg mrl-ebon a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above s xbw -emb/)g3l.rlq., 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 wity+vp 8r5iu /cgh the north pole entering first. As the north pole enters the wire, the inducedvpiu /+g5r8cy 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 rxuwt5q,kr2yx4 b)z :an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oriw u4x q:5xyr2 )tr,zbkentation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at cop5d antq,8o )nar7)h nnstant angular speed about an axis whose direction can be varied. In a region where a uniat)nqp5,8rh d7a n )noform 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.e;v;0bom3 n blw3elfwn13ro (nyd;* q
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an/ucbdgmi hevqc; m;yj:5t :83 $emf$ 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 magneti g6ky/ye h:ncmi0ef46c 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-wk,n+l(/uzg py8 /artqest direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a sl az8k,rqupgt/y (/n+tatement 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 rh33 eqrr9a hz(w+cr *eotates 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 transfoj ; . znvztb*)(ahrb1rrms

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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 l)+ 3 y4uzvkijeach second. The frequency of thel+4kv)3j yzui $emf$ 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 u*b nspnm w-owc6x9.igyg5y b/ nbr );6sed 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 dedfq q4eqq,+)vl3j ef9vice 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 secondary coil contains -sc+lo p dcio; l3axy,:*4wsamore loops than the primary coil then sl,c:lsp 3iaoa4+y;* -cd xwo 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 thef3yt 0lt:m2vc primary coil contains more loops than the secondary coil th ft20y:ltv3 cmen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th u20gd*9*7iz dpmhg(a uwwc2we 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 resonant cirhs **am9tge +6yxkx 8mcuit,

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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 ingl8d1 6 +a18 hyrffsbwl)/vpeductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made sl1wa/yfdlrf pe6 81bg8 + v)hwith 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 sh;q( kk0,e piz/bgu)ieries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor;kug(b)iq pez 0ih,k/ 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 inductrk i j6n3wi5rt1+wq2qance 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 rzz ( pbnwg4p6*esistance 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,z/gpj,f/,oa u zyru4mhw-c5wb:u s c2* q(ms time constant for the circuit rep,pcauw 4zc,/h w(5yrmqums,ojg*u 2f s/zb -:resents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batteejp4 p,0: vpxjry is sudde0p epx,jjp4:vnly removed 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 syz+ nefjo.98x ame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, tew/vmnh ,i-yx: 6 )grfhe 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 thlq6p / h.ph9lhu(.(bd(eb cpi is circuit, the current (6c ub.pl(ebhh( .phpld9/iq

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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 ch o*7oea; x9in 6nyfz;banges by what factor when the frequency isef6;i7yxboo n z;n9a* 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 A9f5 i ihjomo *i2pj(u4ozza 6j2 jy/e*C voltage across an inductor is doubled, the inductive re22zeu5 4j/jfi9m *yzj(*i oo p hai6joactance 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 across an inductor approaches zero, the-rpc-cp h rr;i)dn)c hlq 80w. inductive reactance 0. p )hdl)cr ;wc8rncqr-i-ph 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 thij 0 6y1opvcv : 9/;os 6zqctg:odflex1s circuit, the curren o /9epzj6ys fd x16cqt0vlogov:;c1: t

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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 3jcc.h2 cl;bb l7uhe2 when the frequee3jb7l2 uh;b2c.h lccncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of fv- iqoi95dem x ,h4 2:5a jeb)wl(yuqthe AC voltage across a capacitor approaches zero, the capacitive reactance of tv9uhl y5jbo2)qem :iwa e,4(f -x i5qdhat 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 bilftx* +yjh4odtn/qv,i: a. 9etween the voltages of the inductor and capacitor in a RLC series t yj+ i t9/n.*qa divl4o,f:hxcircuit?

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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 a m/zgulrd)9*a kp95):vp u sxtn RLC 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 circ-n( xbox1fsxtx eh33 7uit. The impedance of the circuit increases if R increases. When is this sx-t (x3onebx1x3 7s hftatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increase,7;h c7fkjj 7nwk(mnbs if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedan ; atgmp;+;yv a/bhon5ce 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 botb-*deje m 0fo)h double in an LRC series circuit, the resonant*b0efo md-e )j 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 vt gh*.isn;i)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 circ8 mg- ,kj0fj/gd(lge z6gl grei5j; 0ruit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieldxl1 hnumk8nsp 9y h27njp0) ni7pf2c: of 0.20 T. Find the magnetic flux through the loop when the plane of the l18pk2p7c: h90nn np nihs72 ym)fl jxuoop 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 magnetic fieg-z*hib 0/b :)ouappo6boku( i wx3 ,uld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector arui:gkpb3o6xbhuboa- po )0i*uwz,( /e 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 radix dftki750(yepmpo os c;2+c./ 5 ccysus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throms ki5c sc.5 p/o ;y(f7cedxyop0 c2+tugh the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional 7 hs5ho76nmjv area of an adjustable 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 f3d;krh2o3v8 uzmu rp4rom $4.0 \times 10^{-5} \; Wb$ 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,b0n fol ,)gla frame with sides 18 cm. A uniform magnetic field is applied perpendi fn oa0,ll,)bgcular 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 and 6,w qpw ex7p9nql0y4 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 annyw4 wh q )5r7jni la.cw8f7l;d 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 horizontecba ;2jll1b7r(cm d:ally at a location where the dowcc:b;1al m7 d l(ej2rbnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulax2 g4f,w17ecvz7lzx qr velocity of 2.0 rad/s axl,czw1f e 7z 27v4gqxbout 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 cross-sectional area: en+dof .ot,u of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of egj(fkv14 d l)2am//nxo ,do dwire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cjkz 5/hl*pcc) m 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 th /lcpkz*5jh c)e maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of g(yzhu.dmij(s7)f: rarea $0.090 \; m^{2}$ 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 ,(ij- u)qdw d8lrai)aV maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the a,)-qa)wld(d ru8 jii 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 agg72fsgoy5,ncz*w d b +0bcjqt5l- u( maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motoejh. - wvw/eh1dg; pyrjgx(1c0 0;gewr 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 havewf/ynr7kr rz2h)9 m ,k a resistance of 6.00 W. The motor operates on 120 V AC, and when running n ,m2wzr ry7f/ r9k)khat 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 conhw+n7qy:trqn6r i 1e3)tz3m;scs u 3vnected to a 24-V power supply. The operating current is 1.0 A. What is the star ;vczwu ym637qs+e1 st33):thq r ninrt-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 6.0bs*.hmqpq h ly v9g5a( /: tiaw,u-fv3 W is connected to a 24-V power supply. The operating current is 1.0 A at full spb*v/qw sh5q hfi l,may v:3(9pgtu.-aeed. 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 interne. v/n5hf )8jlm cgg wb2fzgn9k*10xw al resistance 6.0 W is connected to a 24-V power supply. The operatig fb zlj fxcn*/e)ghw210 v5m.9g wnk8ng current 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 needed to reduce a primaryg+3hv +njrm/,gwl2 la 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 ofy f3rd7*: -vwzrmqf n6 a transformer causes 14 A to flow in the secondary. *q mn3r-fv:6zyr fwd7 How 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 necesplcewlmf w gj1+ .n+b x,i/.; -u0ycotsary in a 110-V primary if the 24-V secondary has 100 turnugy/xc o0+; .,tmwl1-eb. l fj+ipnwcs?

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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-t6mm t/uid4 rx)urn primary coil and a 2000-turn secondary coil. Im)mdt4 6xir/u f 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% efficiency,1i4(xwh tjt8wnj ci 1* how many amps at 24 V can flow in tht h( x*jiwt4jwicn 118e 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 neo)nq vema(f;w ;n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary(vqmewan ;f) ; 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 tu hw,s ujkvn* (1ve-e;arns on its primary coil and 300 turns on its secondary coil. If 120se; eh(u-jwa v1v k,n* V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer ha6qmkz2b-xl da +9x, 8gq 1nlszs 60 turns on its primary coil and 300 turns on its secondary coid9,+bnk6 zlmgq1x z q2a8lx s-l. 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+f;s6 tggi:uvk2io : t has 100 turns and its secondary has 200 turns. If the input current at theu fgs :t;+itg:kiv2o 6 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 10 i5asyuo +:mf20 turns and its secondary has 200 turns. If the input voltage to the primary is 100 :m fuyaos2+ i5V, 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 secondae:sxku+a :0w6gq e j2mry has 200 turns. If the power input2 e +u aj0g::wsekqm6x to the primary 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 1a4f*yyz 8a;i 5 )8cjvxzc ;buo20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.o4; uaj* z8cfyia z;)cy8b 5xv0 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 curbja/hw kt)8jr98 tt: vrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted tr/a889wjth vk)t: jtbhrough 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(s/td- .qlf3 iih wqwukexau/ x275 y- 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lin(a/ 7eux iqi3 5sf2l yduwxhkw.-tq/ -e 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 resis*l9wf3nud3bc/ ,ms,rm. uba otance 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 tra,b. a c,on umbu 9dl/fwms3*3rnsformer 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 kmmjn hic8mg*v* .b,dm 1 long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energ. b*8mmcvh,j *1mdingy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is 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 would b)paq0,q-a pxe1a4a4 g z9wrr de lost if the power were transm 4e09ax ,)gqzp raad4w a-qr1pitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a yr53oo ,:zslxline with resistance of 0.60 W. To what voltage must the generator output be stepped y3s rx,:o5zlo 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 the tt/;nk1g.b r+5eukz g coil's magnetgk+ ntk.z1e;r5/bugtic 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 6.0-8cx/ bi u3pis+W resistor and an 18-H inductor. What is this circ c3i+pibxu8s /uit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 Vlc0 s-q4oum4(a3xb tn ?

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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-(6xbd twuz;x,;rm80m l 8 ekaoV AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the lxhn y4.w(vjty c ;*5oiaon w.4;yc xh 5(ijtv*ymp?

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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 p j6mqmtg++ (osupply. What is the peak current thro tjg6+pm+ qm(ough 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 supp 8deidoo9m e:; t42urdly. What is the power dissipe9dmodudre:4 t o8;2 iated 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 resist gsd+cw cjx-m32, rd5uor 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 mo;sg)x7b .pr a 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 resistor lla +pcjeq 0)0*vq mxqk8pj4 *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-mHkeov68y8t1: qmj1i,wx 3 dnk z 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 reac*nvbg2,75zf7 s nniq ftance 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 haoe /gj f1lh/4kve 14.0 W of inductive 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 necessqt(3be3g 9nbhg0xlx- ary for 157 W 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 60-mH inductor when 120 V AC1xmslm1 q -dk: at a frequency of 20 kHz is applied to qmd mlk:1s-1 xit?

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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 cay2nq 0pr v2 2w q9l6hqr-(( y osw:jcukuy(1hoil 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 caxe5g13n(v4 gbryp/2kol hs)b pacitor 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 2cwz xbl p;m /f6h 4mh3y+ l.xi(ie qdl242xszhave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance azq6 u3.9 mlf ;jh7veoof 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 reactanc;n/ek 9ua 9.w8tqy 0fa ht,itne of a 0.010-mF capacitor be 100 Wt,/8a9nyt ie.9 uw a0khq; ntf?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and f4ef.psc2s 3j5.0 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 serilz xke 7 5bglgw..47utes circuit with 12.0 W resistance, 15.0 W inductive regub 7e7lg 5k.z4w xl.tactance, and 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 1500 Hz if a 100-W resistor, 20-mH coil, and 1f*n4zunw1gj 4 .0-mF capacitor1f4n uwjn*4z g 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 if71rfzkpcg-7pl om95q a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s7prz plk9-1oc gfq7m5 eries?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductonlw /pb0wsvqo-p4p , :r, what is the imp spq olv-,wp0b:4wn /pedance 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 y +y:.3/wtn;p-j):qvl cfaeku vja3c with a 20-mH inductor, what is the phase angle at 1000 Hz?avul3- tykajpv:3n:e /w yjc ;cf).+q

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needeedqn+ xgh8*nkdl g+ n,3l/f: xd in a series circuit with a 20-mH coil and 1.0-mF capacitor for a t,n + +dxn ldqg3*e/x: flgh8nkotal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with adfcxc(uy3z s4-)p -9 ua7yjaa 100-W resistor and 15-mH coil to get ay 4jfxu9s( apu) aadcy7z3c-- 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 inducp.lvr)t i.7d ctor at 5000 Hz for a total impedance of 40000)vd. tc. rlp7i W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a top0 jvzme; zd-e-z;h d.tal impedance of 150hzzem-d; ej vd-z. p;0 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is con ) ks:pq8e1*oe+g cstrnected in series with a 20-mF capacitor. What is the impedancet)goe p*r: +1ks8secq 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 series with a k rh/1 7uvkea;10-mF capacitor at 1.0 kHz for a total impedance ou k/;kae1hrv7 f 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 a zboz08zs z 2/h-(pebq;t m9kxt 1.0 kHz for a phase angq(2;e-ms8bt zzb/pkox90h zzle 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 resis mr hmdt0/4aibn253u wtor at 1.0 kHz for a total impedanc uir0m4abn5/dtm 3hw2e 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 Hiri40r5 f;qsrpa09w eo3 vgq 8z. What is the phaw40aerg 0sq;iprr 5fq o3i 8v9se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 2mg4s,my izg+rs n1 )d20-mH coil, and 1.0-mF cmi4sdm gsgz ny)12, r+apacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.i qyo0o5,dpx1s-lz7o350-H inductor. The circuit is connected to a 120-V, 60-Hz poq7 loxsdyi1p,z 0-oo5wer supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 (4 d ep1+2hvk y/qumht rj:z4xW, and an inductor of inductive reactance 30 W are connected in series to a 110xz/14v:4dq(m e2ruhyht p+ jk-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, ao3dk chqz:8b7 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow73kb: zh8coq der 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 ws zx2d0) wq:nhq ;d,ha phase angle o ,; wqs)0dqx:dhznwh2f $40^{\circ}$ 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 =- 48gtbt.k:ek x omz4a1 hbxa5 200-mH, C = 10.0 mF. At what frequency should the circuit be dreg o54-m tkxb1ba8.4kzhxt a: iven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac serie.ptb tfdz6y8s9k i.f5s circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, w8kit d.f .syb5p9z6 fthen the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit ikp, ts9ce ,ws u9t:e1n 8+ctbts $63^{\circ}$. 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 resin uj/. r 4hq/d:j ;)msm7tyiomstance of 30 W. What is the pow7ny)omsh /: id; 4 r/.mtjqjmuer 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 for a series RLC cir9o y ,/p*wt-m5ryp;qbwcxuv6cuit containing a 50-W resistor, a 1wpy6 ow mc-;tuy/vb9*r,5 qp x0-mF capacitor, 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.g:ri mv 4n/ :r/k((byzsj /a3pyx5yqv0-mF capacitor and a 15-mH coil in series?:43/q ypvz/r ik(a/:jnmxb5( vgr ysy

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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 reb :p);leqcoc0 .p6b;rnznr+ hd*m4 yfsonant frequency dr:cl4 oq p p);m h; e*zbcny+nr0b.6fof 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 with a 3.7-mH mj;1 2x,nr0 yx9rzwrxl *f m4ainductor for a resonant freque9mwxf z jy1l,x rarmx42rn;0 *ncy 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 3jsflcv /3,spseries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 fplvs3s/,cj3Hz?

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