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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 4 usew/cv-6a 56; tfwplziz48ng xb t-are units of magnetic 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 st2r u uwe1y.:tcd 90xcy wch)r-ates 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 proi (5ph2yh4vsj ew12t:x2 rbtgduces what kind of change on the induced 2( :beyg w hr1p22jshtx5v it4$emf$, 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 fiel dquudo1re*;t nn6 r:v .d(y9ud through a loop of wire produces what kind of change on the induu1q96udnr ty: r; n dvde*uo(.ced $emf$, 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 the grx e-lg)0 .hns9 ppu(induced l-0.sp 9hpe(ux)ggnr$emf$, 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 gal 7 2sp )fldttl6,0ymagnetic 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 curren h8v(+rtb1o ,d(gljext in a conductor will be that which tends to produce which of the following effectsd 1ghx(,to le(+r8bv j?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held aboace ( ivbz hk(/qgo6ywl 8mjz*e /5p2-ve its center with its north pole pointing down. The stationary magnet induc m*jq-p o6(b 8 g2wzel/ki5a(zhvec y/es (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 horizontaidg h;w5saoph3 ll w2e 96z/j-l2v-nll table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from sl52ed-llo 3hw/jpngwva h 6-iz ;2l9 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 magnn 9 n6lcq,z+leetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from abolq n9n,z6 ce+lve, 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 tabl fo1 9luqzvoq gf0* ;9hzbw+r+fr3yj;e top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger.f y q* lfjr9hu z3g0 9;+ozv1bfqor+;w When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fiejwa; d:8ub/of ld points straight down. The magnetic field disappears suddenly. When viewed from above, whow :u/a8bj d;fat is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-iuem-3jl; zqtl c/g511dxi,d o ncreasing current northward. Two coils of wire lie flat on the table, onedu-l ,qi 1jd;e13mz/oxtcl5 g 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 of7y 5cw/*za fqt:-)vc3x-aqz b nrb+y b wire with the north pole entering first. As the north pole enters the)ca xw+/:qqzy*b3b7ay nfb- ztv5rc- wire, 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 rotvj+9k.)tg: hr d,6 crha dlno1ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mtklonvrd 6,a)cr:.1 h+9jdghust be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whohdzmga/5, 2;qrn)xwpcl (yb :se 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 innr5p; mwq/cl(,):ghbzda y x2duced $emf$ 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.kb6l,(n p3a6v2 gt7p ehb6m/ny6cd cv
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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 thaf- h jpebg:c7ul yv2f5q,lk, ,t 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 magn4p6bt u:t6: seq/k53fxi 7tzf) di ysgetic 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 52ywcf2 yldm ,in the east-west direction) is moved northward at constant velocity through a magnetic field t2m f,5wc2dyly hat 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 angular + w7nhdbkm6wm)+ij 5qvelocity $\omega$ 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 tranf 8ohi dw)jmcj4 gdx4b b42.b/sforms

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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 thq4m ynb2w8v,m x66kw x4 bx(qjrough 60 revolutions each second. The frequency of thewx6y b8xm2 q44vmq n,xb(6 wkj $emf$ 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 o3 yb8n.9tk a7b m9 cp4pirzb2used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tv;calj 3va4c,e s7)hgt +yb+a hat

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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 more ;vd m*)kyv sbjsp-zv /4zt:a) loops than the primary coil then it ispvv*jaz-t; ss :ky4m)d)vz b/ 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, 2xxcspg,7b s;s) gje more loops than the secondary coil then it;2seg )xx,ps7s,gjc b 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, thy)bc o9 snny q2484tooe 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 circuit a6n aa-dwtbm*zukm 2l270ms .,

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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 batg3o ck azkfsd3;5yah lri6xe/ -+q *t2tery of constant terminal voltage. At the moment contact is made with the ba5kdak r6zlsit 3 -ao3+efx/ 2y *c;hgqttery, 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 cono :( psxo:czf -+eeg24h pd6hkkq53fj nected in series to an ideal battery of constant terminal voltage. At the moment contact i oh-f63(ze o2fkkp5cqgdph:: jsex4+ s made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected twlpe-iq70tv8 cmx h3* o 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 resistan5 ,;bmgw- rs;2wt4,apuqfrc ice 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 tim8 v;oe d.b*ums r,8zp gtv.l/ue constant for the circuit repre/me u;dbg z.lvtrp*,88 v. usosents 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 battery isy,cyy lk/bmwb. v. 0,obnl7 .hcl;) dl suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to o0y)clclb;db,wmk .n.yl v7/.y lh b,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 unitsmcj,w v9n,+a i 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, the c a/f22i)n jeqcf1vtb;ff2q r 5 xw)qt:urrent

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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 co3,,:1 luq s8tmgcj 3rvcxayr7k s.a k(nnected to an AC power supply. In this circuit, the currenc13v,sckkt7l8:ja( ug mxr r,q3ys.at

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frebqb49n*0e*oper+htgp p.t d.(*e q ,b om yo-yquency id- (*be40oh.n moeprq.t ,b9qop+ by*y* pgtes tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltagx0xp;)o hbn6le across an inductor is doubled, the inductive reacta;o0ln xxp)b6hnce 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 inducto 9xi7wphydksq4enq bw e 4r2/tj 1-c4u)m8a- xr approaches zero, the inductive reactance opxh 4 7n 4ywc2)dqwrajiue9/x et-8k- ms1 bq4f that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the curre/5b n dc.*i ewz038ej7g bknmqntwbej dzqgbne3* .8 /mck0 ni75

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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 nwj)jm satt,gqx dc v 8;j:9)5when the frequency is tripl qct stxm );jn8,ajwgv)9j:d5ed?

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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 approache dl3p ta.vr(j3s zero, the capacitive reactance of t.aj3pr vdt(3 lhat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltagel1-gua-5 hm321any pz:wr pyu;nu l, fs of the inductor and capacitor in a w rm gflpyhlpz-n5 ; 1231:, nuaa-yuuRLC 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 RL ul nkprif +694,x3s/tfwp2f jC 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 increassy dau;g8 v e3c3n6+ua7lwm7ces if R increases. When is this statement +3d376m8ac wy u 7cev;sgal untrue?

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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 circuitr2co2 n) th4yu+tn9q w 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 cir(fcw l/y2u f;: qnf,socuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doublenejsdv :if; 1/ in an LRC series circuit, the resonant frequency of tn;j:evsi/1 fd hat 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 applq,+u)wlc bkc,n 6+jdkp( ,) +cgtaxhvied 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 occur-)v1oe1 wm e m10vntnrs 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 fieldqmj ()j6vty :n of 0.20 T. Find the magnetic fluxq6j: )mnty(vj through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetx n,(niifm 3dwb;(dem8: 6gj nic field of 0.20 T. Find the magnetic flux through the loop when the plane of thnmgi8 xi36d(wdjn (:be,n; m fe 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 r f z ore.t8:sls4(l17obk vdcuh:e90f adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wcf8uh9oesd fesz o :07v:4kb( r l1lt.hen 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 area of an adjustable single loop )ci f(wr k8jr2,n0npqy /y07gxpttg: 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 fqoy7*v ; hmxk56ifi 2changes 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 of wire x;o0)jj+ 8x d3mnhaf/ qsj;u son a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the co;mj)0n xs xqosju8+/jf hd3;ail. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of b smz xh+,6g fqr8y,mf3 12xla$0.40 \; m^{2}$ 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 d b(h-d v(5y-d.qzmicand 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 60gvy 9/q1cqztms19 o /a9+mzwt m flies horizontally at a location where the downward component of the Eatv1a /9/9 wmotsm 9zzq 1+ycqgrth'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 anw,tov / yu hcy7)aw8:p2sip y-gular velocity of 2.0 rad/s about a vertical axis through one of its )w:y a it 2ph /p8cuo,7v-sywyends 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-sect) s m2 joob(r-kx.vbesj5g47 aional 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 oe j5,/e8alw3 ha3 fn l8h4gjxrlr7re 4f 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 rectangula /ub: 899mcjamru n6snr loops on its armature. Each loop is 12 cm long and 8 cm9 6u c ram/jnmu8s9bn: wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum 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 wirera.h z-or vbe*2+vzj / 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 construc+p(qmyik x1g0vjvf )w*4 h+ipt a simple AC generator with an output of 12 V maximum when rotatedw*mk14)pjvq(+yf0igx hipv + 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 generator wxhbel8y/ ie4v) h:7tqith 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 resistance of 6.00 W. Th1 i4 qfwaawsyng;;.f/f+rhp:e 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 resistancewvvbj ss24o7* of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba vwjo* svbs427ck $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supp)zv gla 5c67wdly. The operating current is 1.0 A. What is the sw7a lv c)z6d5gtart-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 resis n3 kpuyoaj)jz/-gb )8tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back 8jak-bn/jo)pu zy) g3 $emf$ 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 supply. axe4qk p(gp v450kq oh*;yba:0 f*dw pThe operati 4fh(5pqadqop0vp k0*ebgy; :xk*4wa ng 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 neu 2lh*,tmj0gjeded 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 n9,.ei/qq zu)z6okfiw)j xi3 of a transformer causes 14 A to flow in the secondary. How many turns are in the se e)j6)i /9wuk i3n.zz oxfqi,qcondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a +jr qc.uc6onm7 00 4ubev svi1110-V primary if the 24-V seconri v4oj0c0 qe1 b n6m7c+usv.udary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary 9s aek n,o+vu6coil. If the current in the secondarakes,ov+6 un9y 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. Assum norlf ,,v-hy; 0;gh,hxyu )cuing 100% efficiency, how many amps at 24 V can flow in the secondary-yhl;gx, r;u)h fu h,n,0ycvo?

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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 xi:s/x-*3ft dqtjci(n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does th: -xjxc/*3 dis(t tfiqe 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 primds9i3 dnmpoy4raxkd -*h.qr 29d8-qeary coil and 300 turns on its secondary coil. h-m4rd9dp o3eyx9 i q.*dqd2kn8-rs aIf 120 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 h53gwm/jsw 9xl as 60 turns on its primary coil and 300 turns on its secondary xlw9sgw3 / 5jmcoil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 wa2:ek qbjnk+a7z1exi;y3+/ f m jd: vturns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondar3fnewv++b2 zm7 adaq;:jkij exk y:1/y 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 trang)b1 lhcme r/9sformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volt/br9he gl1) cmage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary /; wagh6 *k)s1kt qluehas 200 turns. If the power input to the prim1g)u * skae6l/wqkt;hary 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 ise3/;v )m-y gok8w(*mtn y ns4 cdga1et usually stepped up to 4500 V by a transformer ak ewc o3 n)t/sgavd-y( 1;em48mnt*g ynd transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curu low*wo29p z8rent at 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 t2*upwz w9lo 8ohe 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 6u2o6a m35ijznp;eq .zp( o 3ea0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transfo.p2z5mzu36n a i3;jaep o(eoq rmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50)gem/g.- lhnta.rw /g km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission./e).rhlm g-g gtwa/n 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 hho1.9 l0l ryxv jb 76:qr,/sh8eslkyyas a total resistance of 0.60 W. A generator produces 100 V a1ly:v,q6. sbryroj xls0hl/hy7 e8 9kt 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer 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 be;9- xo)dw*x2 /u dy tmwm0otwyak9j+a lost if the power were tr -wakya d/owox99+y;*mx wmjtdu2t 0)ansmitted 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 bei*. su dqw vq0(;kybd47icw) s 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 transmis b)ud* y;0 (s.qswiwivkqc4d7sion 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 store1 ;gk-)kue cxud in the coil's ma)u-1 kecxgu ;kgnetic 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-W6e8e p pu3gbj8 resistor and an 18-H inductor. What is this circuit's time coju8pee8 b3p 6gnstant?

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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 rms6-9 8noab yiji j;*xis,zbw 1eod9ck( voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cmuirl+mco51:w+9b d qurrent?

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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 thmdyvth19l9/4c inc 0 be lamphlct9 /mb10cin9vyd 4 ?

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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 taqm 3sr.qg 4ygut c:e)5*vx 5vo a 120-V ac power supply. What is the peak current through the re 5usq*m4.:ce a3v)v5r qgtgxysistor?

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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 the poqh*d o 15j( m4ae4wuudwer dissipated iwu ao *4q1edhdjmu 54(n 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 res3 h r 0yxt6es0p:jaxuix1- u;/( bmvbkistor 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-gxnol bw;1k m0 qkz;p d2)2mg(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 resiz6.vg9ukmx5 dp6l;q;8d0 biimdox*bstor 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 reactancsayh-n7 i,f; we of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance)l1.xs/7akvb t ye (fb 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 wigw1)8wd2v flds rs6ko qk7k48 ll a 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 necessaru+l:1z too/8znyqa,- jy r sy6y 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 AC at a frepp,cg: anu;knyr0 x908r ,kzb quency of 20 kHz is applied to z ,unp9 r0y;k8,k xran:0cgpb it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz - bzbbo0 x49yyjf9m7d 8tc9g dv::wctsource?

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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 react)(hv-hm70+ v:nsvu.ind qagt ance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive react1wd o4o/xb(qlb(s*va ance 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 capaciiuaw o3 rca3k-v1 kk6fhb03+ytor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive ,j(vf)ud ;stereactance of a 0.010-mF capacitor be 100 W?ef ,(j du)st;v

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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 thr wlqk2zs1g cl0alat6;1,e s0 a0 tdck*ough a 0.0010-mF capacitor 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 series0 qoiyvb9 sni ;l4neaflc);53 circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 Wefn9)5niiqs 3bvy4 o 0la;l ;c 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 impedancibn h m0hta:0r ;tzb, bq0)fg.e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?00nbr. gb qfbh)t: mai;z 0ht,

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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 /b7ma8w4 84ogqsfzpwkd +5v pif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectfkz5p4 8 8go+a/ w7mbvpsdqw4 ed in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor,,cvt (x -svp0h what is the impedanchs,p ct0-(v xve 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, wbxyxcc d3i81;vhpv khx9017v o /u6 flhat is the ph9; cb/vyk63 8pvxcufvdx01hi1oxh7 lase 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 w7-x6giw26eum ki) hemyzg86 kith a 20-mH coil and 1.0-mF capacitor for a tot7z6m- ie m)ige6wg kyh6k 82xual 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 q 7 jakna 1mkae1fh.w o:gu37,with a 100-W resistor and 15-mH cao7a 7hn:.a3 m fkjk1,gu1wq eoil to get 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 inductob/a,.1tvlq yfwzc6p /r at 5000 Hz for a totaalftwbpc/ 16 ./ y,qzvl impedance 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 buw0rmfp-w- h/ti,anw 0x *t/in series with a 100-kW resistor at 1.0-MHz for a total impedanc,atw*m-/r0h/ip f u xw-tw0bne of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the 0o0tw(bxept +j m- q-timpedance att-(b+0tjqxp ew 0m- ot 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 at 1.0 kHz for j7,9xf7tcxaz a total ixzcfxt, 9 j77ampedance 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 u2a1 ::pw:k.ljyx8/vuuq ah l kHz for a phase angle ow: 2/:k .uv xaph:1l8yuulajqf $40^{\circ}$?

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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 forg*2i3nqj hhtbp ,k u9. a total impedance og 9u2,ip3hbjh.t k qn*f 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 (pv;fz ryavw6e* 5 a8fdy1*wq at 120 Hz. What is the phase angled5weyfaf*p*;(zqv6v 8r wa1y ?

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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 dh vxwr( to298ky;sc.-W resistor, 20-mH coil, and 1.0-mF cap.;tvroxd8ky ( wh92sc acitor 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)rlvtz 0uge *., a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in t)tlzu 0*vegr.he 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 capa ,z9m,u mm+mzgcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows im9gz,,mz+m m un 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-Wda*)n:j4 ds) hu m.zsy resistor, a 10-mF capacitor, nsdz.*) y mua4jd ):shand a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phaz5m: hqi hw2e654ee dnse angle ofhe :dz5ih26 enwq5me4 $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At w4/ tf2bbv(unyhat frequency should the circuit be driven in order to have m u2nt4f /bvby(aximum 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 mrlc;j6o 5 o3i(qluw+ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and ;iu w5c 3(ll6r +qjoom10.0 W capacitive reactance, when 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 circuitpwjkv ibylv +l8r0+ g,7wh41k 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 0opypk9+ lo5p:q-ar i s;lmw(aw, aq; resistance of 30 W. What is the:0k5 +apq;y iraqpwalw-m(;, polos9 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 RLC circuit containing a 50-W resistosmo6 :ijh b0b0r, a 10-mF capacitor, and a 0.45-H0:jm obs 6bhi0 inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-wyj f5umu 6sv26yn3n9mH coil in series?f m nuu53n62js6yy9 vw

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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 sertxt6iu; s5wu) ;zv qz2ies with a 4.7-mF capacitor for a resonant frequency oux iq2 zz w)6vtu;t;5sf 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 r77jkexhf:6a 3.7-mH inductor for a resonant frequ7 e:7hk6frajxency 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 resistou i;gn3-e zad+4mxuhm6 1u2c) t8qnp ur and a 40-mH coil if the resonant frequency of the circuit is um2umgnhiz;)e1uu-+c xq nd436t 8pa to be 1000 Hz?

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