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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 magnetic flux exmj43y p- d q9yl2tnov7cept

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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 thatzb5,ehv : ev/o 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 kin(z i1) 7eu,ogoz)n*u onfh1j dd of change on the induce7,no gfzu)o1* zo1ejduhi n )(d $emf$, 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 magnet p mo oa4zr fhuhc-8ski 8-((bit-x,7tic field through a loop of wire produces what kin8im-b8r(,ohh ts7f4oi(c x-tu kazp -d of 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 what kind of change on thh usyd a*q3t(.j,0gqg e inducedqg uyh(3 s.a,q0t*j dg $emf$, 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 6o 18 o9o,y x*6y4 br+ibc p;ayttytbia magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an i 2x qe:-px -jske8 agno(n(z5rnduced current in a conductor will be that which tends to produce whr : 5g(zeqjxsn- -28ek(ao npxich 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 lies1a.s7gn9govau9 2q nh flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationar 7uvg 29n1nqs.aagoh9 y magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tablekmp j zi1h1:mw gj;31w. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet indum k g:j z1whp1iw1jm;3ces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poi:ov1. oi7 4dybiaogszx 24lfo8w i 8;nnts straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fiel z87 ;:ax2vogo 1s wflb.y4od inio8i4d 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 t-a ,mmrp(cb;x op in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When view,pxmc r-bma; (ed 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 wheresa -n2+7n7 hl l,pscls the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is cn lnlsh-sa, +7lps72 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 vq31h5 qpqew5-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current q 5wh53qep qv1circles

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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 owm//4w jeod 4ff wire with the north pole entering first. As the north pole enters the wire,ww mo4e/ f4d/j the induced 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 constg*yzm 6v3 1yxyozp1a.ant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induv*31a16ymy. zp gx yzoced $emf$ 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 u,sfctg 6(no/+lmlu7iya j0. speed about an axis whosem7(6 us. y,j+l tf/aulio0n cg 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 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.uvn i0x8q,(z a
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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 l oszrlv.n826an $emf$ 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 1v nnm62dsw1 va magnetic 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 oyqbkjx. *b.w/8dsqz07 tlk) in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerni7.yx)ds lb. 0z qq*ktk/bwj o8ng the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular g(2c5sdgijr4c+) tu,yf tdt;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 generato 6pmnvferp 6,qa.nb::c v7,eur transforms

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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 revolutionswc7e +rg .wn,v each second. The frequency of t 7w,w rv+ecng.he $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used e(8jh 4d ;fwdg2tk hfao4pk1 x ).nne7to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th l*wpi3a8voyu( ek( x;aj,r7mat

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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 setuod/ih 7q,o8rznba2- 6)m48 hmgpjjcondary coil contains more loops than the primary coil - ajhir87)bqo24u o/gzj68t hmd, pmn then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secs 0i)-tn s bfavz1gd94ondary coil -ant gs41fbsi90d) v zthen 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, the poweobo9 y8- xsm/mr 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 circclq t kti(036fuit,

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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 c 0wcn6dh/6fgz onstant terminal voltage. At the moment dnc0/h6 fzgw6contact 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 induc+ep1q 1i0w/x3inq4k7x nq dik* wnfx 1tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the i/x 3q1efx x74d iiw kni1 nqn+pkw0q1*nductor 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 indze f3 7/1xc jhhw2q3ynuctance 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 resistance R is con4m0awb2p cl8;qy 6azy nected 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 connecqx ,b, dm0k :tils1z;ua-q ul*ted in series to a battery. The time constant for the circuit represents the time required for th ,mktsuq-bi l; qd1 ul:z0,*xae 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 b rq.e )ahg. le,wkfu.4attery is suddenly removed from the circuit. The time const.qf ha l eure.4.)wg,kant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units8x.d iy k g+e*pumw/;v fqq5a2 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 tor ; 8s.)1 gynrnuwz+gj an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power suppl1 qx/pbkrvot+:o a702jezf vbj k ,.r.zk/et8y. In this circuit, the currenv r/0. e8k,zj rjbpt72/k b eov qoka.x1+tfz:t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circut2g l5p wodp22it changes by what factor when the frequency is trd2w p2 lt2pog5ipled?

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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 voltage1 9oqf.z zt6/h ;bwvr6wmcpo ) across an inductor is doubled, the inductive reactance of that .9o6bt)z;qow/v c6rm zpwh 1f 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 thet8 (pwya)7sgxuvj/+u zl/to8 AC voltage across an inductor approaches zero, the inductive reaz 7 8 u8ytj)xut/pgasv+w l/(octance 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 anyef9n,* vbr v3g1ck7a AC power supply. In this circuit, the current93k n7cagfyrb1ev*v ,

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance /uav /l7r-kys /wr. qvin an ac circuit changes by what factor when the frequency is triplvu/7./vr/rsa lqywk- ed?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor ap(dmksh:9-w7pw rh 2-vh jokl0proaches zero, the capacitive reactance of that capaci hho(2m:9w r-dp0h7kv lk-jswtor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages ofvp0u7ydq+z6 n8 nt1bz the inductor and capacitor in a RLC8vb dq 1 6t7p0unnz+yz series 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 j lkjx*myqjj( ;;oc 0jeks q7+;3+p kwcircuit 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 impedancmqq3 c ,c8h6 u3cyz5ta ni:mey7we-j+e of the circuit increases if R increases. When is this statcy ytz7cqni5j3w m:q c -3hea,+ mu8e6ement 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 increasegzj3pcs;+7qxo fj.yxi a m(2* s 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 impq24 5yd -tn:pdk ogi 5i4q4nbpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doumxj2pwe l,bdc7+na9- ble in an LRC series circuit, the resonant frequenc7a ,m-dc nljpw9 e2+xby 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 drive/w0 ijwm ad7 vhv2k9)i 3n*a14 mbqlzwn by 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 circuit occurs whenmri 3w:(6tnxtke -r)m

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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 f4qy3w 9sulyhtvyrds 92+/u* t/v o.nmield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallelr4/t9d2qyv +s sl .yut*m3noy/ hwu 9v.

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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 a8q/ g;lcti:gtiz4q5a uniform magnetic field of 0.20 T. Find the magnetic flux thrc/qz5l48igta: qti;g ough 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 rap qa41k /vu 9qnzdvms8 *1:tpnz( l(fodius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thfz znmd11p(a knqv 9q4uvl *:s8t/( ope magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced :s xbuuv2b : (6ynyfpm1z9 j1xno4e0h 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 co0nf9ocwur 15ox-x9mk/xz v:sil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns ojgbad*f*z/ct f*c7i 1 f wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fie/1ftcidg *cja* bf *z7ld 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 withwnpz7j;( p15is9 8wol8 q tcx( qln7et 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 ap(7d3d b4flhdvukpt582 a pfy (otu2; rea $0.20 \; m^{2}$ 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 fliq;2k hkzd yj4/es horizontally at a location where the dohdy/2z;jq4k k wnward 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 barl n-x i,(ybuf, that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant my( xbiu f-,,lnagnetic 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 509s26ek: k: mpht:mt.hp3dhk;e cb av3 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns op7cp 4; us2shw r-qbo3i;*i*)5 9tmukt tplryf 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 -9wm:fq bvp/c its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an a:pcf wmb qv-/9xis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum 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 turnaz cgdp j1:8ua*n,q k.s 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 ofd ye*9x(t uzo, 12 V maximum when rotated at 60 Hz. A magnetic fi(xed, y9zou*teld 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 gene usq8;d7t(bgau53umx8e4 q b;inyuk .rator 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 a resistancld5lx .jzt5q-cz p91f e of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resis+ aa)ufts(xf:(lz,tdak(jk k 6+i)pt tance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a back ka:f (l) +sjzk axk6ttp( (a uft,+id)$emf$ 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 intern8h:0lpd (;jq,w vydmwal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the q (d:ph0m ,wyjdwl;8 vstart-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 cgl98ll t( r,fsonnected to a 24-V power supply. The operating current is 1.0 A at fu(lflt l9,8rgsll 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 connectet1je 0ofpsv:i*us 45yf;sw t7 d to a 24-V power supply. The operating current is 1.0 A at fu ses*u01j;sif4woy t:p v 5ft7ll 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 primary voltage of h+erh.9po6epi(nm gzf3-o/ bxlc*9q$120 \; V$ 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 awj6mmt 1mkf ;;f3io- w transformer causes 14 A to flow in the secondarytfm6m jfwk;w3 o1;mi-. 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 vx7 uk v37.mlm6ra 3oknecessary in a 110-V primary if the 24-V secondary has 1 voa6x33 7vu kr7kml.m00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondarf3-am f5kg wl 2d/ 33hwljxx5wy coil. If the current in the secondary is 3.0gfwj/ h2ak3f 5-mdl3 w5wxx 3l 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 thlvik, cr 97(gae primary of a transformer. Assuming 100% efficiency, how many amps at 24 V caniaclrk7, (9gv 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 siguah/xp9. 1wym v:irdjt )k2 p6n transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doe y.:pwtixu16/)jkpdrh2 9 mv as 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 on2cx i yyo3(9pzs)nw))rkm4:fq agd;t its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to t x zo( )tn;2y: d3qki)fwsp4)c amy9rghe 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 prtt1n lxrb(22k imary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tontr xb ktl(122 the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 dit+ vomx )h40turns. If the input current at the primary is 100 A, we can expect the output current at thetxidvh4 )+mo0 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 u2-l+4 /gi my3ldg cassecondary has 200 turns. If the input voltage to the primarycd+mg/4ll2y- 3sag i u 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 transforme fsvift((i)2p r has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondasfi ifpt )v(2(ry 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 l;j 7 npf;p)q9bbr3ptusually stepped up to 4500 V;7pn9bl3 t; qjprpb)f 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 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 ys.:u8*8 pd 7fvlljvsof current at 120 V. The voltage is usually stepped up to 4500 V p8dvvf78 y*s s:lulj. by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuamil5qlo -478 :.;kek sbbfjg: 8gmkt xxmtq :3lly 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 transmissb4qe 7 ikmm x.skg:mt5q- 3tl lb8j;:k:gofx8ion 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 geneeytk w( 2edv8j5nau/4rator produces 100 V at 70 A. In ordedu2k8 4/ jey(n5avtewr 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 resistan5-/xschq,s xgce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy -/x,hss xgqc5is 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 pov *rp*i iboj9s e) /z qznllf9n0/ze99wer would be lostnvs9r*jbnz/*lepe99 /) z qio90lfiz if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to,ky:q xpw/8q (jy7uk r be transmitted on a line with resistance of 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% of8 yxjq,y7qpr /: kk(uw 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 in8 m,8n/cxd .apjclw7r r+w q;k the coil's magnetic xq maw rdkcnc/ +;8pl .8w7r,jfield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Wha:sk)*6jsilz - d 9z+/wkvpiykt is this circujz i6-vk p/+9s*k)sy:z dkwil it'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 voltmr1ujf( .h0htage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC o9b 2d *wd,fhzc m,t(uhutlet. 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. Whatt4m1njk:nxj r5 ci3/tg.x q h, is the resistance of the la5tt4n ,ki/hn3j :cxg.1x rqjmmp?

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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 po0v0go(dy-i g ue,0rtih *tmd7 wer supply. What is the peak current through(,i0e0idh7g t vydu0g r*-mo t 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 connecteqls)2 ok hizef7v+9 g0d to a 120-V ac power supply. What is the power dissipated in the resise97vlhk+o ifzg 0 2)sqtor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through aja4zpjxvv ;6. 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 to 81 q.8kuc 6bgk)xtjresistor 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-:o:btlc1v2 ;lj* udr lW resistor 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 inductor at 60epn.:uw z sxx/2z )v3h Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hz1h /7m7,xb(pnhu0uyxof e8+ zult )o b?

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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 ih q/8g0n1 wsp9tadv5a 14.0-mH coil have 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 necessary for 15k9)pov8oedy q5tzy ;g /9 hyhoq9eh127 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 AC at a frequencmr -yam*s) k+ /ap0kmwy of 20 kHz is applied to it?w /ka*0 kmy rsma)+pm-

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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 coilqh h*.j7lkyhrickfjrr i*:*3 4z k)/a 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 reactanceuc r/pzw :27if vj 0p-24oim:1ceay cl 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 capl eg,,dyx;lnuevj0f58 i34cm icz-b: acitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 Wv ;j:s1hww iu(?

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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 capacittrld c d(8* u103+p(slp2*ycuwhf xq tor be 100 Wu(l t3d(2q pf l0w*c8 xs*du1py+ht cr?

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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 10t,b)v1l jep5xv70ngp9nx /xc ty u*+e00 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 cdwwk8 6p yndo17 + zhi7ju7l)iircuit with 12.0 W resistance, 15.0 W inductive reactance,zil1)7d+ yw n6hu ijwdko7 p87 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 Hl-a- ts5hf 7l3ijar *ubny9n5z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are colitfhnnjy sa3-u-* brl795a 5 nnected 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 9ev wow,arjli3mm .w-f 00fz0Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sm0e0rf30j- fwo z.vw i awm,9leries?

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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-mj.yt c7pmnyje*+e 0pulz.w(*H inductor, what is the impedance at 1000 H.jl mpp7.ywjc y e*0uet+z *n(z?

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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 connecter j)8 fyshb 2xy6e06zyd in series with a 20-mH inductor, what is the phas j x286zy0sfrby)6hy ee angle 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 series circuit with a 20-mH coil andxc8s2a-udru7z9 pb3 m 1.0-mF capacitor for a total impedance of 100 c u93 7m8prbdzau sx-2W 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 capacitance c+5yhc6pf *man +j)xws is needed in series with a 100-W resistor and 15-mH coil to get a total impedance ofy* +j5mcnfx +cphaw 6) 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 )l 1nc5 aw xl nj(9bdca/yozt*,a4ya6 in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 Wwy ald /c5 ca aab)*,1xt4ynj(z 6n9ol?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must dcb9(vww okh 66*xgg*be put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 1*w6gw(o6 9h*kxcvd bg50 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the imped(lca7ku+me;t p i5kp4zaper,i6,fg3 ance at 10 (pgkp4ef7,ai3u6,rtz+;mk lea 5c pi00 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 at 1.0g).4b0kn djnbl6 a7 es kHz for a total impbe njd6) l7b0ksna 4g.edance 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 needencl0.gxsp j 4x(h 9/ hma. ;jh9lh-kgad in series with a 10-mF capacitor at 1.0 kHz for a phase angle o-49xm ap g(hxc sglhj nl/h;a .jh9k0.f $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz f2fd e;- vo ;xx66+ vmgxqm6p/kneye:kor a total impedance of 45 ;v6kxqe mn /:edv;p+ fk-o66gxmye2xW?

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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 c (h5oizx:1 qkthe phase angleh qi 5:(1xckoz?

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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, 20-mH coi vxdm( e40v+lal, and 1.0-mF capacitor are conlvm 0(+vx4de anected 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 consist;3y g2lfn keyr k1s()bs of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-y ;k(1) 2lbe3rsk fngyHz 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 capacitgd6o4t o.i p b.7xsnq51lka iwxz5-m4 or of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hzl.i ag55 -4nido zwsmb x7ktq4xo6.1p 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 resikb9lnw( s2m4xstor, a 10-mF capacitor, and a 0.45-H inductor, when con(wkb42n ls9x mnected 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 sofr 9v*w03 agzht.4 zueries with a 500-W resistor for a phase angle of.r ow3z hv*fzu gat904 $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. shr90zilz;k (oxj .mb:*btf ,kdbn 12mn7 4rz At what frequency should thlz7fkbx .mb o 2dikz(*j1:;n04 z,rbsm9trnhe circuit be driven 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 series circuit with 12.0 W resistance, s -at:c/i sp3n15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-asn t:cs 3p/i-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 circuit0e,)mt*o )pxwhalgj mj6l j1 5 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 rl2w;bt:2oi gglo,b9 pesistance of 30 W. What is t ,p:wigob;2lg 9lot2b he 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 for a series Rvq87n0sjp8v r LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co 8vrvs78n pqj0nnected 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/*yxe zox5m+m)3g bmfr/za6 g capacitor and a 15-mH coil in series?g /3bog xmzm* e5)rf/+z6 amxy

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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 ab ,s pm,0tne3jo2rr84.7-mF capacitor for a resonant frequen,ro8b,t r2e3sj0m na pcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant f7/n-8xz8 re lalp w0gnrequencn8 pw a8nxg-e zl07rl/y of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor5pg)e9fnmug8tz w) k ( and a 40-mH coil if the resonant frequency of the circuit is to be u8p )k9 enf5t(ggwmz )1000 Hz?

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