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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 uuzzfb9;w yo0fvaq6:zs if0y9 f-n 1y6nits 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 st8jywf4l ds f,/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 i2te*k) psbji 0e ,d0syr+wnq 6c /pp/jn a coil produces what kind of change on thebwssjpe ,6/+r0cj2)p/d p ntei q*0ky induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetiy 3. bpjx(xs9,fc0yg ixqr:k+2egs +rhm2au( c field through a loop of wire produces what kind oq.muxs+gej9, kf(2rc 2+ :yxax (3sph b0giryf 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 pr*h,/h 0truqi y4e+dsxg ,j n)poduces what kind of change on the induce)+/q*,n exjd40,i rsthh py ugd $emf$, 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 removedya)czw:.g qb59iee v ; from a 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 a,v)wmq,lj1k p n induced current in a conductor will be that which tends to produce which of ,q) w1k vjm,plthe 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 table. A bar magnt. y e3x(n4+liqywl5 if n)n0net is held above its center with its north pole pointing down. The stationary magnet induces (when3f)qny+e 4yn5nxl ti wn (l.i0 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 k w1coa60:cqeon a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. Aeoq ca61 wc0:ks it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a ref,,k y:);ps widld2rab 5-g yjgion where the magnetic field vector points straight up. The magne:bg2iap jl -dyws ,5,r;k)dfytic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the mldkft 7pu s )cl.1th.;7b 2jixagnetic field vectoptt u.bh;7 7lc12k) jxsi.df lr points straight 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 horizontal table top in a region where the magnetic lo 07j22dlvspic;sr - field points straighopllds rc;j2i-v2 0s7t down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tablev6 , t y(**miahci+y-raz xez0 and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side ofmvz(* , ha60yat*ci z-reiyx+ the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole 1:gg9ehvb 9nzentering first. As the north pole enters the wire, the induced currenvg 1eb9gz :9nht 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 rotn (o-: i2fnc08hr m vn+powhyh4-sdy:ated at constant angular speed about an axis whose direction can be varied. In a reginh8sc4wy:d 0pif: +h2n on yv-rm o(-hon 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 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)y1g+zy0aiyktcke 8 u8 6jaz6 angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mus) gy1 cu6 8z+eytakyiak0 8zj6t 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.la4fug*2vilp ut no2: u. -6p xo7ip;j
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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 aey hf:vrnm6qy6bic( +h5x1l *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 m9yhv wj2gh4;p agnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at b9pbp v1 2iwe*d/w0lp constant velowp*2lbip09 / pvdbew1city through a magnetic field that 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 barih y7cyv63 t1 e.bt.zvr fu8p, rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans oi0jf4 tj8p*)8n3nln owe ud;forms

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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 revakn 1vcc5l2. colutions each second. The frequency of thnc vla2cck1.5 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 device uo*ui gvtd/y2gs- r ;m: 2xgq5 uaov./rsed 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 d)2f 6pj 4lnfnvevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loopsyd54 zu//dqfa than the primary coil then it is aqu 4da/d5yz/ f

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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 secondab7 s :1jazp2fvy*ct ;fry coil*j:2cvyf astb7f;z p 1 then 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 powerrwa84b b;trl/.twf 5x 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 resonaqfl a*k8w,k) ant circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are cs;aqoihty/ -8onnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery,8 t;o -aih/qys 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 inductr,b8z p sd ;ng*:wt65)dkuxpnor are connected in series to an ideal battery of constant terminal voltage. At the momens,xdn*p b k6gdun 5ztwpr;) 8:t contact is 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 inductadwth 1v/uioe2lx:8z3nce 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,dxz8tv* a mab-wsq; 0 -k0jle 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 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 ti om)8cu*g(fhs)uh, *h* 8w(w2 mtevioe3rq go a battery. The time constant for the circuit represents the time reqtqfm*3*giv,c*goiem8shwe (h8h )uu ( ro2)wuired 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 seriesx- +9tl+jh iii eye22a to a battery. The battery is suddenly removed from the circuit. The time 9xh -ej2 i2y it+alie+constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unisl0i9j-mq4ed ( s9jf)p1rsk cts 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 t 0yn)qmxl0p 9current

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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. m0mqx ,x , ocruhc83 rcb7h.s8 In this circuit, the currenh8c7c h qmscr8b3u0,.x ,orxm 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 circuit changes by what fac+a z(dgl5-ue1c.cvl/bw- td 3ol itk .tor when the frequency is triple(. 3boki-l vu1.wd5+tdllz / c aetc-gd?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductiv6 ,kpghks5 i)j twgz)6e reactance of thatg5gtzw k6hs,i6kp ))j 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 l+u,ln;y;:oun x (qa0d x,op zvoltage across an inductor approaches zero, the inductive reactance of that coiq ;,u :pano0(zl,+; lxxndyuol

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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+c gsub):r8d/w6atxn +dx c/wn:6b rtu )ag8snt

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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 circu ; 96kttgphh)hit changes by what factor when the frequency is h t6tk;p9ghh) tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capaci:a .yzkb,5uaqpw8x 8g3,j* yckq.zav tor approaches zero, the capacitive reactan*z :.b k8,xy y u,aqcvpq3w5 ajkaz8.gce of that 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 voltages of the inductor and capacitor in a ;4in)zt9 umrs+w:cbhRLC ser rbm4hszni;wuc)9 +:ties 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 9f.4ct5tcajc :aw cwiscb9 8)as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increaxpardem9 , /68 ucxv2: 3h6prsg3aqxk ses. 8 qmha erp p/9a3g:,32x rxs6d6c uvxkWhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of 2g4o hz7mi *piws;q0kthe 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 theisffm( 1 -./t 5s/2wt z dwn.bgoel+pb 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 double in v5tos.z-3)ocd+ xwi man LRC series circuit, the resonant frequency of that cirtxz5) os.c+i-od3vm w cuit 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 t m + ter5(:yg *vu *2pvsbzcyiyz7;zw5hat is driven 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 ciqr c a:k,cs(5( (x+eha l5fkfgrcuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magn;7ru jjr * pn7fbs/*quetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.7nq*f b u r;jj/s*rp7u

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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 magneo-9o9ntpnu35 yenb6(.fg r t d(99 ,crjfnvxj tic field of 0.20 T. Find the magnetic flux through thertx(v995 focy69otdn3 n b9e-(rnujfn, gp.j 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 uniform magneticm)*kf/(( nd0gp (.m uz)keg7m ndxhn h 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 anggp *md()) 7fz dexg/h hn m(.kn(m0nkule 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 ad,aj7n l y66cs pepl;h,justable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fro dy806whsivq 7vyi*n;m $4.0 \times 10^{-5} \; Wb$ 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 fram k/-at03o u8r04 o tlzigj)hqre with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes u khq0tzi0ro-jg u )o8lt43r/aniformly 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 turnuq 6um i 2d0oa85ips -m0*wmgsg /t3fxs 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 area aw)bu+i*ys:d o k8gdz8o: 9ws $0.20 \; m^{2}$ 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 q,uhn :a -; sr81cynsl60 m flies horizontally at a location where the dow,l1a8nsy:c h;sru -n qnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulel5ggyzr04od y3 a s15ar velocity o5g34ag1o0slzdy ye5 rf 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 and ahivk t*( koz43 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 consisi7pr0 okq84 *qr7l siwts 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 rectangular loops on its armature. Each loop is 1cxkvpng ,9xwumuc+z5l- + -k;2 cm long and 8 cm w95v wnxx, +; u-lkzpk- cc+mugide. 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 wire of 0 , )e. az3h/qy7znitieqa hh8j(bml(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 ofpvw,us,1 qu0z8of: cn 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T i: ,fu ozc0uvp8,sw qn1s 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 hahpn6 9)-rqc7 do prq y4r:cch-,)f igenerator 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 o10aoi23gpq1 2ep d ghmotor 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 resistance of 6.00 W. The msa.oy 4*+ 3g *k5:apwcb9ul1q fg ajlrotor operates on 120 V AC, a *:lcgr . p5+fowyu glkj*1sa94b q3aand when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplyi8qx ya(f9j*s3 in8qsd.1 z 1*bbgqw r. The operating current is 1.0 A. What is the start-upi3 xdsw8nifrq*q z18*9j 1 .( bsybaqg 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 x7aw qt/wj/w4ex j4*dis connected to a 24-V power supply. The operating current is 1.0 A/w wq4x/e*jwaxj7t4d at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 e6: c ejoxdn2xq 3fr0;W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. : dj xxcn6;23e of0qerWhat 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 nel)8l sx7xhzb4 eded 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 crqlxmyy ,+ 4g,ifg -b5auses 14 A to flow in the secondary. How many+qfxl,iybr4g5my-g , 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 i4 ip2(jhinxnk7g( /ec1k )cvd) w5ycbn a 110-V primary if the 24-V secondary has 10(e)jik(1 vdw )in nchbkpx2c5/4 gy c70 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 szrjky u;bm(a, 0 oa/;-h*kry eecondary coil. If the current in the secondary is 3.0 A, what is the b/ yr;j *huozk;maeraky (,-0current 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 trg-(;5ww bc/8 hzzwtd bansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secotb(c-wd 5wzb8/;wzhg ndary?

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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 ng.8v l0ap6(x2plhc k at 10.0 mA. The primary coil operates on 120 V. Wh0 gnplxvc2 p6l8h(.a kat does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformert,y j:-bb b,rb has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in thbb, : ,yjbt-bre 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 andk *utm/(axr9 /oo oi,g 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the second/*r/t,gi oxkomu (9oaary?

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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 turnsn0.a ,q.zr zjgq lo-)q and its secondary has 200 turns. If the input current at the prima0.z)rg-an.,zl q oq jqry 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 yg *wbhrxl8 ycha, /(.vf) z2vhas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of lgyvh .*yva /xrwcbz(f28 ,h) 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 200 ture pa/et5ks yg4 89s.cens. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional /e4tp. sa e csgye589klosses)

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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 usua8wh1owx gy5b r7p3q3 clly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary q3c3hwo y 8gb751 wprxhas 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 bh13ij6zgg1 sm+e g*svoltage is usually stepped up to 4500 V by a transformer and transmitted t3 +giejb g*6 s1gmzh1shrough 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 r5;rcss )mvd/rv rt7u5-dd7y current 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 tr7 5dv)d-cryr5 /vut;s msrr7d ansmission 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 mmw*6c+ b sggr;y6kx2l.qg-b total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss6 gg+ ;mqbxgw2r6- .slyc* bmk 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 resist1fzw3 uax a-hgbh-z(m6m (k g5ance 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 energh zhkz-63xbgamw1((fm u -ga5 y 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, 3uw vl4sei4s line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 w4s,u4 lsvie3 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 iszk /*bz)tb0 gn6 :xwpw to 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% of the origxb* 0tkp6:g w w/z)bzninal 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.p8*stk iik y9mxo9pm3vc,*g.0 A. How much energy is stored in the coil's ma *mi9okg*xp,. s3yit8v9 k cmpgnetic 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 0da;3r z*ji6c3mx lj aeqs2k*6.0-W resistor and an 18-H inductor. What is this circuit's time constaniaa;re63 qk02jc*mzxd* sjl3t?

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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 wherctrtr*me3g/nk k4r 9zh 5+lg5e the 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 pe ut w3*cvce*m+lj7 7dknh9 i6sak 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 placn) v1xb/l5 djzn /6 nfkvh-0tled into a 120-V AC outlet. What is the resistance of the la nxf61k) /- dvnn0ltj/hlz v5bmp?

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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 powe5 dr ncw)62lijr supply. What is the peak current through the resistor?dr5nj2 w)l ic6

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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(fw5ofc 4 yc*7tvh7 6pr hj2xl supply. What is the power dissipated in the resistorlo(w7jh2pfvr 7y*ct ch65f x4?

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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 re j46rftt*d rl:s5)xa3ogy*/fylz ; 1ryf5 l vusistor 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-l: i:6coq dw*oW 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 50-5wix.q,n r b- +f 7vuptzf+6dlW 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 6;c :am8yp c:pods/+j t0 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 9t. n+ gmkluiourb4o.;1h 9upa 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will fj4sd5 -4tcaqa 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 neces3u fd-x4. nxlsoe+ 5ihsary 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 indd7l2,mjuo5z re*wos +uctor when 120 V AC at a frequency of 20 kHz is 57w, joel2u+dmro z*sapplied 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 2.6 mk f-n yw2.j;zrj7ptld;mg150-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 ldiup 9pt1h0; 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 reactance at 10donb1k7ep, pn u-j1 r3 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 1200k(weu /mx:r zqxs* -.h 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 c xx4kui)8y;jnapacitor be 100 W8yxx ni;uj)4k ?

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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 iqio dmvd8nj. :r5v-(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 series circuit with 12.0 W resiso,(jo-- lwws gsk f.trnlll4mr 93g30tance, 15.0 W indu lt3 3soo,g -0wlsrg.lwlrn9mj(k4-f ctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil,k f.q;rbefhu78.x ocvb4 / e7t and 1.0-mt7 . rx;cevf/ke7b4 .8houbqf F capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-m r1dk)j)mh7wvH coil, and 1.0-mF capacitor are connectedwkd )7rm) v1hj 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 indu )kybsbi-kua au+c.(6uenn*d 0if9 e 3ctor, what is the impedance -nf*i 9a c .nu eu3d+kasi y)(u6b0bkeat 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 inducr8* s)tj(ri9:t4 lmpfqegyd ( tor, what is the phase angle at 1:rtip(jl* gq4de8 fmr)t sy9(000 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 neede 2 n50qns v-wh)8citzyb8n4z kd in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impe iqn 4z8nth5kybw 2zv)n sc-08dance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-+a w. tbghc7 /jld;n-uvox.-+lso+ lp W resistor and 15-mH coil to get a total impjl-++ood;sl ughx-t.npc + wv7a/.b ledance 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 s. x q7*jjfuft-v5n*y a 450-mH inductor at 5000 Hz for a total impedance of 40000 Wj*x*.j5v-usnf q yf 7t?

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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 oqb;p ltqb3q b:x 48k9series with a 100-kW resistor at 1.0-MHz for a total i:4 kqb;o9q bq3p bl8txmpedance 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 connecte(v9 4 kxcyeklhq: *3yed in series with a 20-mF capacitor. What is the impedance at 100 *ec:4v qy3(kx9yek lh0 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 capaci ;0g zanjzgs1 s2.lz2c sk802sjphic6tor at 1.0 kHz for a total i2zn2;a6ks 1z8z.jg chs s0 0p2i gcsljmpedance 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 neede5n baz3xu*5w ud in series with a 10-mF capacitor at 1.0 kHz for a phase angle of 5*u3wxzub5n a $40^{\circ}$?

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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 wnz/ w*5hn xk,m21r jycith a 30-W resistor at 1.0 kHz for a total imp*,k1/5h y mjrnczwn2xedance 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 ahxal96)*xq7gwemc o+ x q8wt 6 100-mF capacitor at 120 Hz. What is the phase angl6 cxeo7wgtah* l+x q9 q6w)m8xe?

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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 Hym w*d5-6ddjov11hy+lia2pods b; 4e z if a 100-W resistor, 20-mH coil, and 1.0-mF cw 4-y d op;1laodm6dvs 2yhe+ idjb*51apacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF cajxe a4j*x)y b.by.+yvf(jc g5pacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power sup *v(beg.y cyy.)xbj 5xj4fj+aply. 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 capaciu+fkuomzvv* .s/v j;(tn86zo 3yag: ntor 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 fl (:gyo6v k. ozs*jnn+;m/a8v3ut u vzfows 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 conta qdy.9fp fc/5qining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wff/ p5cy.qq9dhen 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 rj. ng9e rx1klhj*;2 bcesistor for a phase angle ofb9xelj*. nj k2 g;1chr $40^{\circ}$ 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 x19sk j6xy :4habr2l vW, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order2rsayhl j6k 19 :b4xvx 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 resistanc/kpt*t+i :r5lxbcrz. ,y j.c x ij5kbc*6wd)be, 15.0 W inductive reactance, and../ xc , tj+*)ryz5rk6ckl5p w*tdbxb bc i:ij 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 circuit is 7+6ktsfhk 5jc$63^{\circ}$. 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 resistan6 6e+ssfem/xz ce of 30 W. What is th+/6ess x6mze fe 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 contai rnd yv+l3/f4tdt fz**ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenzr *v3ty4n+ftd/d l* f 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 sert wsmdz160/ kvv2zae/ies?z ev01 s/k6vwztd2m/a

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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 4nmgsdri 02nr9p13ka0 kt09a6nab o qx 9o6n s3.7-mF capacitor for a resonant frequency of 10 ap x2 nkk nimq0or90ts bd9a3as69n1o0gn6 r3 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 withplc ,a /yq0v(g a 3.7-mH inductor for a resonant frequency g,a vlq0p(yc/ 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 resist ep;7tulkd7e- or and a 40-mH coil if the resonant frequency of the circuit is to be 10ku7de7;tl e-p00 Hz?

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