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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excmti 73r i,sbxv csb z95zj616kept

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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 indj uf067nmxj0f4rj *wkuction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change of/(8b th (wcs(vh(ff nn the induced s cfwf(b/ hhfnv8t( (($emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire pro akw+ m9vurx z9g+ h1gwt)yzn,z*y89rduces what kind of change on the inducew,)vgz 9r 1zk rm8 +gzxaw*9ynu hy+t9d $emf$, 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 che s mqc)hf7nobxwae 4fj d/*;x73(wg 7ange on the inducewjds4 7(wacm ;*qo3g7)b / xhf7xeefnd $emf$, 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 magnetic0 4 drltm8cmle )7gg3n 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 anh*d/s0gtzt99dt7 tx a induced current in a conductor will b* 9td tdx/t9zha sg07te that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal mumvm4q0ltsrj ;:m2 jm 32 d7wsb48ao table. A bar magnet is held above its center with its north pole23ssm 4omat;jqj:l 48bmd uw7r0 m2mv pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abov +uedcr4n,xk6 e its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet inducrk n4+xdu e,6ces (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 57 ,s c 2ulr :o5uxezhqnb59rlthe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field 7uh5 qo5l5 :en,2r lsubz9cxrfades?

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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 lu5d iwm2zq4d l)be w.(4is ho1.y6lxvevel table top in a region where the magnetic field vector points s51 qxyw4u (bvmei.42h. w dl)isd6ozl traight up. The magnetic field suddenly grows stronger. 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 ho0(.(+zb ,esd/mlr; mlxum d exrizontal 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 inl x/(m(zlesrdumm. ,b;x e0d+duced 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 anytz(v;b:r nqb c +1iywn4/:q w ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the innq 1;it y4:b:r(y nq/cbw+vw zduced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nort;g;mrcee 5z .yh pole entering first. As te; y.gc ;rem5zhe north pole enters the 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 rotated at constant angular speed a/a f./70srxpidt 1 dcjbout an axis whose direction can be varied. In a region wherp tc7f1/isa0rxd /.d je 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 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 aded;4/fqc.qfi oe ;v+) y9yxxzm )6zw t constant 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 y./ ei 9eqo);qzfdmc4z d ;)xyx+wf v6rotation 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.tn(byaib z6c8i/bq,.
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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 a. fan r,eu;ac;n $emf$ 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 mai3urat9-c8 b3 nv jfy/8a fnm3gnetic 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-we;stj t o5t-c,ast direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement conc t ,;catost-5jerning 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 6pr .vy( wm6xeangular 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 0lu lyvs rd6:/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 revolutions each second. The freu +fg/ 6szbtw59pz +cxn; ql3oquency of thl z s 3/o6;+cutqbp9z5wgfnx+e $emf$ 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 devicey4*cq rm4s*zh used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a debp u1tjvr-rni(p5e: 2 vice 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 secon-un ;p(y5jxmm0sb) bedary coil contains more loops than the primary coilpbb (e)uj0ym;-ns5 x m 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 cot0z1 **ihvalynmbx3a9 4;iq*n , ioqantains more loops than the secondary coil thvyannam4hial 0 **qiz19;bo x3*qi t,en 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 powej3a lev v t8t:qpr7z ky:d)a,3r 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 circuz7v7) ;xpdeimg,3 k4fbw* iowit,

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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 inductoa7x xrm.n*mxm9c s/t0r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across tn/rxm 9tsm 7cx.0*maxhe 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 ses qddn/ o8r/ 8u6pmr3lries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the irso q n8dm/u 36dlrp/8nductor 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 tuof,/c6/ np evo 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 connewovc 430hf5stzor c3w+upe9sd0 fe (: cted 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 b5 o.ng tmvn;4cv*.hv iattery. The time constant for the circuit represents the time required fovo ;mv* . cg.54ninhvtr 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 serie: )sqlv2 gw qmy4+io.es to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requloe+q):.gs2myv4i q wired 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 havegvhp+oq:k; y5xnj 8/c the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply.guk2d bw-c 8dzw*nute9* ;( mh:rn /wy On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In tjmfp706xs ztu : z/2dthis circuit, the current7 20/ zdfpu:ttsm6jx z

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactac:9 azx.tgl /:sm1avrnce in an ac circuit changes by what factor when the frequency is tripl:csvl t9:graa.mx1 /z ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductoy pa l9+5ex8wth7um0.z8gmc or is doubled, the inductive reacy0ct omhwa 5+ 9pxzu 7e.8g8mltance 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 ac. x jge2kwjw s: ei-b98weipe2o+)ijv*ltx 8: ross an inductor approaches zero, the inductive )sxex j+8 9wte gpkwieeibw: .*:2violj8-2 jreactance 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 supr7 +enc5hpv3 uply. In this circuit, the currentrcp n53 he+vu7

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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 9 si-cl (sxp(pac circuit changes by what factor when the frequency is triple- lpsi(p( 9cxsd?

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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 capacvgav5 x9 vmrd 6/+ia1ya- r zm8tnk:y7itor approaches zero, the capacitive reactance of that c t av /7-y1ryzx96dig ka+m8n :v5amvrapacitor

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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 of the inductor and capabg b8gri k0u+6g-n.cecitor in a RLC .0cb6 gg gn8 ieur+b-kseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as wl :wp:b69kct$\cos M = R/Z$, 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 impedance2-k;a tmhbk 3s.p 1jjs of the circuit increases if R increases. When is this statement truehtpss;- kam23k1 .jj b?

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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 impedh;,:lmh.er : s*no-munf ae6 cance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuwya/j7k1t 5/;zfld 6q 5i 3punxzyk:)s 9 lknoit 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 dou2:yfzr t33x xtble in an LRC series circuit, the resonant frequency of that circuit 23 t:zyfrxtx3will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resoj3rmk2 q 0vnvf87.cj+x)2 siw 0skxhj3ho; wk nance,

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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 sza.sxh h716i 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 m4,6p*t/qjjfqo hop.lqh e.ww (,t;l r is rotating in a uniform magnetic field of 0.20 T. wl4plthj 6p*q ;w,jf( rt/e.o .q,o hqFind the magnetic flux 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 uniformi ea fchn01p6ip,4gm(t0d :ia magnetic field of 0.20 T. Find the e(fn:ai01 d pt60gmph a ,i4icmagnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unir.cot , gc,w ty59m0h:a4q xsmform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angl 9tcs4ot,:xm ,.5cqh w rg0myae 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:-e aebf.2huvy2/ of p 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 fj3ci 3fqonj n9b0 0-iurom $4.0 \times 10^{-5} \; Wb$ 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 fra*1pv sudby1t2ykull*( f8lu p;f5+ld me with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the avera1 ;l8+*2t*dkbuulf p1s(ldvfp y 5ulyge 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 da.dz /ju(,xy 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 area h 5p8sfu:m8g* ln9 bpr$0.20 \; m^{2}$ 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 horizon0stkql( 61p z4)qhm363 qw dqsdgx2vx2oj .iqtally at a location where the downward component o4k3xq6qoqsd h2ti 6mj 0)23qw vpq z lxdgs.(1f 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 thyjy-ysg ms 39/at is 2.0 m long rotates at a constant angular velocity oysgm- 3y js9y/f 2.0 rad/s about 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 a bl7wn*n j5y um2og op3a13*hfgo.do2nd 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 consis6b fxd-vku ps7irpz+a (b+x.;0mr9z tts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 rectazt2r(vx: ;k uingular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magkx i;2: vtuz(rnetic 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 100vbi8er n4*mi ) yliy*iekl0u+3qtp 9/ turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple87i;n s+)y8986 xtir sud xvzko)fmtq AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatingyx)9i;vtss6io fdk)um+8 8 7 t8rzn xq 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 gen faw1fhqc:k/3xy uf-8,jo yi.n.6zroerator 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 resistance of 6.00 W. The motor operz2p+ ig1epw,8,s tiltyo.j* rates 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 resistance of 6.00 W. The motor operates on *h:fskq )h c3 g k.s egu0sxp9+jdq6/md7n mv+120 V AC, and when running at full speed it genph/9hd7q.0d m :)sqngskg*mjxs+fvuk63 ce + erates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected t;ubc7 ea/ yee+o a 24-V power supply. The operating current is 1.0 A. What is the start-up curraey;7+ /beu ecent?

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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 con,5 s;bjok -aqanected to a 24-V power supply. The operating current is 1.0 Akj ,;sba o-a5q at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rwvq b.mjn kx498 j uvup(9wrw 5ay95q-esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.w wxmjk4 uj .p(uyq5qr998bw-v59van 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 isinn1*nbbwaj0 d/2/po needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 u 8ad15 h9bzxvA to flow in the secondary. How 5dhuvxab1z 98many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V u3,objrl8ak83xo 4+oxav ;z jprimary if the 24-V se3rzl8jx8o xo,k+;o3ajb vu4a condary 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 primar6txeludba9 8kqo z9k:ui 7z*1y coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primd xa k8lzi*u7oke1 9z:6 qt9ubary?

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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. As z:nwtw fwv:9 mfyz5zb0ph16)suming 100% efficiency, how many amps at fn1m w5h ww y::t0 bpvz69fzz)24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 1d)c-:wfj) hiu r7u6 pl0.0 mA. The primary coil operates on 120 V. What dou6 fh)pl7icu-jr: dw)es 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 03ky kfssv7(acmpt 5 gl ff6:9turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A i:va(f yfk9 0fsp3l6 5tckg7sms applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secy/7e pnylgf ;c 9,*dutondary coil. If 120 V at 2.0 A is applied to the primary, wha*/yp;yle ucd, tf g79nt 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 t, *ex ksg;o.u g7k/ z5kpx5qcburns. If the input current at the prbkk ou.,5/pz ;cgke *xs 5q7xgimary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If 4cb 3wxy-ovv .ckd11.tym7 og the i-otxvy1 g kvdy41o3..b mcwc7nput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2wnky mmd005vybi+ l (.00 turns. If the power input 5ywdb m.nky0mv0+ (ilto 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 120 V;dwn 1; 2mejldss+hqzq( w+9y . The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power l9q wl+ s 2y m+qw;zjs1nh(ed;dine of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usu5:cjornm / u g,,p;dzd./tj 8*vbm q hzvkxk/8ally stepped up to xqv,mrdgk o c/k:;5hj 8t *b/nv z.p8d/zujm,4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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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 aa cd;0ynabgr83b 9ia7v0*b scurrent 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 the transmib 7gia; v c0ana3ab8rbdy*0s 9ssion 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 z q5)a0e6qsj 8i mf,b /7wyqhm0.60 W. A generator pq ,zf m i7q6e/b)y0ha sqwm58jroduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be 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 3tv90izvc g, s50 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 line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What 9cv ,vtiz0g3 spercentage 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 m lh6y e: 8i0e1adq usyl(-o*p8lle.a tuch less power would be lost if the power were trl*aa t0u:i8lsqh (dle ey86 l1ypo .e-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 be trp3+yekh4l+mj fw+ +f qansmitted on a line with resistance of 0.60 W. To lej+wk+p+ 3h+f 4qfymwhat voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 52 9/ umdvrba5u.0 A. How much energy is stored in the coil's m9uma 2r5v/db uagnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W (,ztg3prm )kq 6*rv; )mfa5yto ogv6eresistor and an 18-H inductor. What is this circuit's time constanvgmtto ar 6;6 5k)pom)vye ,grfq (z3*t?

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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 thei4ki7p 8wei8l rms 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 curr0u5r 3uv2uoin9 7pj/m 4a*uzf aver8bent?

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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 resistancz ul:yat qwv- 8 hi(z3kga;21qe of the laq ;aqy3(82l- t izzgkwuv:1hamp?

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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 supr:6q7a fqti4 zply. What is the peak current through the resisto qq4tri6f: az7r?

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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 nr4*ml1py5nvzr y0x w;g1ca2 power supply. What is the power dissipated in thep04 *21y;rx zmn1wcvgyl anr5 resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 1qs6qpp-s 491 89j ajls:q nc3toqhtnis $I = 0.80 \sin (240 t)$. 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 resi ap i+gkm*j4u/stor 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 +tk5 j:yu 2ktm sy3.qi4y. rjpresistor 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 p-3kzt71l q 1d7p)wpx bk*vzrat 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 of a 2.50-mH coil at 1000 H jl,t*p5 r 3qyeph+xl9c*1x zhz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductivm j*um8kbg9xskha-aynli.)x 8o 5(r6e reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of induc yfs8*(-1kn tou;t3jlk0 xd5h:yuv wntive 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 11ytpdvv2pc;t;f x 6 n,20 V AC at a frequency of 20 kHz is appli2ny ;d,x;v6vftt c pp1ed to 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, 60.0w)fwgz. 6obu wbv+ rm5t)0t/d 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 reactwmdc xns*.u00z9d 0hsa-c 1 ijance 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 reactankmdz p8r; 8)t02t rhlxce 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 reactancnqvv5ukm0 1u gx/4y8 ne of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 Wr rce8-kct mua9/,0md?8e9r t uck0rm/,cd-ma

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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 ae/z0jw6i -rl-oy gkv.t 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 a*3 c* mqeujm2ln ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactquc32l*mj *em ance?

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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-xm t(o0zb6mxoet -b (qaf.f/+W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser.xxo(0bqt(eb z -omf6ftm +/aies?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mf k. ea4rmyx:vqarqv1c ;5a61o //4nmpsix7mH coil, and 1.0-mF capacitor 7kvmx6 m1ir/ : e544rs na pxqmfyc vq1.;oa/aare connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in se j)b50xovg-h 3mll a6riu x7:uries with a 20-mH inductor, what is the impeda-xb5ih la6 xm)l ur:j7ug vo30nce 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 inu8b oou lg4 3entw6ab-0+nh .zductor, what is the pg3n4 bu b .tw8henouol06+ z-ahase 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 and 1.0-mF capaj b m8,xant,x6citor for a total impedance of 100 W at ,xb,6t8jn mxa 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 cv x8da o6c-/maapacitances is needed in series with a 100-W resistor and 15-mH coil to 6-ao vc8 ma/xdget 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 inductor at 5vt4l sa6360en4x2/oveeg .go0 v ewdw000 Hz for a total impedance of 40000 W?w204egeavo gostx/n60.e vdewl4 v36

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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 resistor7 jd7hyk8d-mi d )ok9-7 yhwxr at 1.0-MHz for a total impeda7h 7d)dro-h8xm k-7yw kjy i9dnce 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 83sxit/lf)jk g.tl) , 4k jlqpin series with a 20-mF capacitor. What is the impedance 4 jsi lxk8ll3 k,gqt./t) fp)jat 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 capacitorvsrd,g2 b -g3c at 1.0 kHz for a total impedance gbvsg32cr,d-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- *whzv6 dwx+y-mF capacitor at 1.0 kHz for a phase angle z*dvh -yw+w6 xof $40^{\circ}$?

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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:2wxx9co7pe.6mzy q l series with a 30-W resistor at 1.0 kHz for a total impez7cylw: m. qx96xe2podance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. W3hc(wso(n 9rk hat is the phase anglso wk9 crn3(h(e?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mmim6o7nhyhtiq ol3:s/( 77 neH coil, and 1.0-mF capacitor are connected iie(76 7 3iolq:7sthmn y /nomhn 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 v0ie-nwie j+m:buv) e7ho5 h-a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to jn:i-h-u) eio vw0 e7bmhve+5 a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductorn6jwje3- 5wh(n9 io vh ohi5v jjn( 36wnew-o9h f inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistlc9:qf5p3itn hgs;p y4l*u n .k x0jr*or, a 10-mF capacitor, and a 0.k4p qginfp5; *3nt:csjx* y l9ulh.r045-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 ackki cz2cs r 94 c8ynkrl8u/-: phase angle ok y8 rn/82irzu k:ls9c4cc -ckf $40^{\circ}$ 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 q (;cgx+9ugh7ganndac*ym*/ = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the d(n9 xmyqa;g cg7+uh/ga n*c*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 p38icr f1q ql k,xvkc/(--f lfcircuit with 12.0 W resistance, 15.0 W inductive reactance, andkf(rf,civc8q f31--q/ llkp x 10.0 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 cir ae vu/mq;+le5m p,l(bcuit 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 andfd 0-nzatm0tgm djd g;n5b70: a resistance of 30 W. What is the power anj50d: gz ;7bm-t0m gf0ddntfactor?

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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 t1 q y*lo1qh/aa 50-W resistor, a 10-mF capacitor, anthyol11 qaq/ *d 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 1.0-mF capacitor and a 15-mH coil in serie/w89,a7crtv zdiot.(q zzp) l-8zpd ss?.crpz s vqzt7il,wo a/(d9-dzt8pz8)

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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 res1noi5yv ;p 5wprh b9d9onant frequency of 10 kHz1nriph;o yp9 5wdb9v5?

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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 )t /m5r2n1lt qk6ojrw with a 3.7-mH inductor for a resonant frequency ofk)/lt2onjr 1wtq r 5m6 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 resi /4fqh ka0u-4tnrhc1dcox8 o( stor and a 40-mH coil if the resonant frequent f4uoaqn 8h 1rcokxd/0h4-c(cy of the circuit is to be 1000 Hz?

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