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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 magneu6.q tz)nde0ztic 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 states that the amh/m krf p+1,$emf$ 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 w 4o)4fm1nfeb0 em c/8fhlg/tin a coil produces what kind of change on th1/tg8 fbeflmmfwh4ec)4n0o/ e induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field throu6ev:ccz;-gc4do2tc j2 foke* gh a loop of wire produces what kind of change on the 4e 2* jod:c-c6czg2oetf c;vkinduced $emf$, 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 oyaz1f:r((ust f wire produces what kind of change on the inducfzra: (ts(y1ued $emf$, 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 magnetic field an lnhw/88-sr o*ppoi2 4v dj .xt$emf$ 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 direcv gvqp6+ ix nqz2)u)9ztion of an induced current in a conductor will be that which tends to produce which of the following effects?xzi) 26qz)p +v9nuvq g

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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 baraonj0e f 0tgcz;js n, 4ii715n magnet is held above its cj0;0t 415g fsnoenin7j ci z,aenter with its north pole 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 :kit( pt.u-zfom )cd559j kvm magnet is held above its center with its north pole pointing down, and r)c9z.-m tu m5ifv(k oj:pt5kd eleased. As 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 region whe32lk+nz 4q ) .qttxtmthmi.p4re the magnetic field vector points straight up. The magnetic fiel43+4q2tntx) .thkmmpqlz . itd 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 regipu90ud b(6zb8wrq rx8o h :(yjon where the magnetic field vector poin:bpj988zuqrhb d(y x0 (uwo6r ts 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 bx d-594 v/gaekzn+cgtop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from adg5z +-/9g4akvcx ben bove, 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 5k f;/pz9 n7u1; fb0u1lkf duj3lqg vgon a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curren3 j k1zfgfnpd; q57g bk ;u/v0ulul91ft 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 thomb+pxvgc o:0 (,/co9a gnt;drough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be g p:o/v xcao;c(otm0nd b+9,g (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whorya8 t5m do+)+hcsyr -se direction can be varied. +co 8d- yhm)+st 5raryIn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 whose2:kg (ics yqzry2f+v 7czp+q08sq+ jw 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 ind c+2 +8z s7zrfp:gq+wyv2kjs0yiqqc ( uced $emf$ 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.tnt v+9 a.d(ar
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an r:sa/bg, jxoj83b3nm$emf$ 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 magnetic u r30grosz(; qfield. 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 (or (+ v(wic 6lzwn*(mlcvbw1lser2)g i*iented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acro*1mw*b+ 6irgcszv)ncw v 2il(e (w ll(ss 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 bin hcw g3 ,7rbly5to07pb8 j,sg.oy8rcc5r( xar 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 trske 1) bhxxq*b3,;slfansforms

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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 secsf-7 0kk+x;ulh9 xh econd. The frequency of the fxx7ukl 9ec+sk-h; 0h $emf$ 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 dej o 1*)rzmf8hdq/v3yivice 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 d6-tz4bk c98 zzhi tnl ;jydd2)evice 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 loops than the prim,0l+eeiymb)k4rp.qu*:v i dh ary coil th)u*yq+4i hi mekr: p .bed,vl0en it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the stcog9t 6tlpt3g 53)2ynzz xu-econdary coil then ittzu t2lg35pn) cogt96 3yx zt- 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 power inp 6ue dp.. b fn7t(* :drbwrvmymt1i9l4ut

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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 resonan)ob:p8x(vu ac.* j 8oq 3a smhzmop69nt 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 connected in series to an ideal battery 9hpzy 6pmv114dud5d+l * tsi79d xvbyof constant terminal voltage. At the moment 4 6 li zvt +5dd1bp7psd9v1x*d9yu myhcontact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are con 7*je;7.g b(nrtjb30vbpjcnf nected in series to an ideal battery of constant terminal voltage. At the moment contact is 7v.*g0t fjnjb(bb 37ec;prnjmade 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 inductan;rca xm()wca8(j cii 7ce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R u. fip8ps m3gb ma4t4*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 batd) emer)pcn,xyoi:/,k e8rq(tery. The time constant for the circuit represents thneqykr/mxo)idrp,e 8):e c ,(e 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 seriesgpmb m,p yw;40 to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time r w; 4gpmpby0m,equired 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 units except:s+y;*j1f xzo n

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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 cirb:qj 752h uvv(*ucljj cuit, 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 this circu dxj gkhi4e yeg(45.xd p681ivit, the curren8 dvh ege.ip(dk ix65gj 441xyt

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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 q eil5w.m.zz -wsbbeh:x +ck hc3f 4);when the frequencz5bkhlem+xcb: .;cwq.whi4 -e)3sf zy is 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 voltage across an inductors p3b s98;ai (eis.fh0rvax 3l is doubled, the inductive r3 .rv0fspi3iheabl;s ( 9xas8 eactance 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 inkr-rk yr)e)vu6aj-9 sw 8 lnobg/.r2a1ug8f oductor approaches zero, the inductivgrea- 81v2)g8. 9klru /yw)ka6o uobr-frsnje reactance 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 co ft4hfgc4w7f5 eyn1 sjunn4.2(ois7dnnected to an AC power supply. In this circuit, the curre5iwn7tj1 2( sy7eugf4o dfn4c.nfs4h nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactou;b8z0rw wl n:c)pmxgd* i1- ance in an ac circuit changes by what factor when the frequency m8z*r:pwidw ;1x-n oc0 )bglu is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approgb1cvv ekf0t 77/f6( t dz)aqoaches zero, the capacitive reactance fv/t)bt7 (d1 0gzkvfao6qc 7eof 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 capacitoru9 s t0)wbbvu6ney3-57* ydn rhnu1hu in a RLC shtwd5-3s )u7n*bru e60 nbu ynuyh 1v9eries 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, d5vfq7/i gsn1bgrymq0 r( d, RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. x.hw7 ynhmya4 x8j31qThe impedance of the circuit increases if R increases. When mxwh.h j1xqy83y4an7 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 the circuit increases o7v)9p 9mt2wv6qww e dif $X_L$ 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,bp+j9 gz ,as-5pj oac 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 vw:49 rb, xtrv0w9oe yin an LRC series circuit, the resonant frequency9tx4w,vr9 byeo r0v w: of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by anyxj5p y755 9 iz-9wahl wcqn3c 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 circui8 ho:r(7 kb zb dktrjp;3f-3mit 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+ yd4.4 lp8qe. m5 *uw uyevio9ek;zoe uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mavu e; +pd.lkqe.ez9o8wouy 45ye4i*mgnetic 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 u(;kbg yfgg,(rsm: 7k xls +p/jniform 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 l/ gy+7kgrsxjm ,ks(; f:pb(gperpendicular.

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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 unifl0o h lx* 3ckwv,s fm6a b(6w5,zgojp*orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop ansf6 cj0 gw,h*6kpol3* va5xow(zm ,b ld 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 k5 ; ku8 p:t-mgxwxg;9rild2z an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a c6ddc: nshay ci:(h/ac0r s7;uoil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turnp 9uel 6ne61b907n v0n8k fjfa0vzi jxs of wire on a square frame 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 averagep z06 70 0a6xlbe8f9v 9ivejn1ufknjn 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 **fxn .jb mkm *k qvdng,0)kf*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 x we ;..fb3gkii-e+9k usc l/aarea $0.20 \; m^{2}$ 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 horizontallygh8gps wf2. )hb2utm 6c8t ,rg at a location where the downward cwg,.82tbc t6gf rps ugh m)8h2omponent 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 thxu;l6e 9kns az(6rpf( at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant ma(kex6r sn6l9 u az(p;fgnetic 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 loop w lp0h7j7s)nvs and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tu1e1 a,ecq2sfne f +ix(rns 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 12 cm40 ksi g fb1gm96xv/qw long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis oq s1/w xmggvf6bik 490f 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 wii.zkvo. )c9koupcbxgdm:k vk o2 *q 91 c;wq-)re 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 f bn6 +bq-v.sdn n7z:hd e,:caa simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availablabnb+d ,6nd n.q:-c fve:7 hzse. 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 with a max rryz tyczt+ y;4db:tc3g(*7aimum $emf$ 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 resistancepg3x y8poc ee8-u +gc+wv-:ap of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a reqr 6x,2su opi/nh k1x-qe f.v+sistance of 6.00 W. The motor operates on 120 V AC, and when run,- nqs/hqe6. puvfk+roi x12xning 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)tumi ;rzax.ub/qju 1lnt1koos(0fz)/ u i15 to a 24-V power supply. The opera1i1zuuf u0 s)ultoxa//.z;i okt1b(5rjqmn)ting current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supp 6yol+e hipk;)ly. The operating current is 1.0 A at full;e6+yiho pk) l 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 rdcim oe;) zsg+ qfh0.1esistance 6.0 W is connected to a 24-V power supply. The e1. s hfgz;o0m)iq+dc operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to red0u1 5uf6;kz*ig8datqsu d+cvuce 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-zpx,x 7i,ak/ bf;lww of a transformer causes 14 A to flow in the secondary. How many turns are in the secok x /-w7,zfb aw,;xpilndary?

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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 h v0m4o)lv. mho6kpe9in a 110-V primary if the 24-V secondary has 100 turns?.kovhm6mel )4ph0ov9

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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 second:3*ynuyn/oxnyr ) 0csary coil. If the current in the secondary is y:yxscn/ oyn n)0ur3 *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 in0i7aa . qpwv2h the primary of a transformer. Assuming 100% efficiency, how many amps at 2 .i0 ha2pwavq74 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 10.0 m7c/ctoz6p8g lo 86f, c4 xgoohA. The primary coil operates on 120 V. What doc,cpoh64o/to zl86 78cof gxg 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 turns on its primary coil lbp+jj5c6cyn* c 2 v8.l.aqg5bb*w l gand 300 turns on its secondary coil. If 120 V at 2.0 A is appli *.v*c+ lbccbglap6b.gjlj ynw255q 8 ed 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 co fx3gsqa727 (;viwudjil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curreviauxg73jd(w; s fq27nt 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 turns. Ifme+6cr ulo7/u ,rj,hu the input current at the primary is 100 A, we can exrc, lj/7u uou+h6rme, pect 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 it /tr5+s730oudum dsf3 tbx9nks secondary has 200 turns. If the inputdsos rkdfn +30/tu7 xu93t5mb 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 9s2xom tiob3pi. -g86(zt8 lo rm5oinsecondary has 200 turns. If the power input to the primary is 100 W, o9zo(g 3il.miot mr8o n-2p6xi8 sbt5 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 12g3taa )*g v*y u(w3htk0 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 tat gy)3(aw*hu vg*3knumber 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 usualnv58 awq siq12iyv92in+4tegho1k vjn6 x /9gly 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 trav g1go28v5 kjn1 2/ax yqw9 ne 9h+iq4snti6vinsmission 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 currenom v: j-bgm,g:t at 120 V. The voltage is usually stepped umv, go:jbgm-:p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission 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 oxx+.s+ pr9gu xf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would br +xgpx9sx. +ue 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 resistancebre+9gv: q- zkc 5tt; ih62aim 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 origi;2iqz: ct9bia+m v5hkge6 tr- nal 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 lin hje2b* vet/qn 8an l el:pn4-hrv0q5-e at 1000 V. How much less power would be lost if the power were transmitter t5/ hn8ejeq04*- bv:nv ela-nq2phld 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. gbf v w.55 cgyv:tuc+s,go ,:aIt is 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 transmissionvug:yc +fagt,w b5 vs:cg, 5.o 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 store9hg ) pdp82hwngrr7 dkj y0+4ed in the coil's magnetic field?n p ykrgj98g 4hp27+ 0rd)ehwd

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is tlyc(.s -q;y,w-g mx7vtmw.xvhis circuit's tx..xwm-7(msvl, t;gq-yvycw ime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circu4oh4;dk)p x i r.9nnaph3r:tfit where 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 ounz 137xo0v ie. x3syratlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistancy 7vp-ne k:hg 0uihb6nkz/zw3o), :ole of the lamp?v :zh-/,nw 6okze:ybpko3g) 7nlhiu0

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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 supply. .y fne-o t)q4(kk hlx2What is the peak current through the resisto )xln y4t-h.k 2q(efokr?

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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 suppsiew)ob+7v.x w9lk b k.q-3n ply. What is the power dissipateklvpb3-w+noqe 7i xkw s.).b9d in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resicns7w5.c9c histor 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 s(r6v h9v piy ssh/)5n50-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 ngkkj05u;gs /pko+1 z-W 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 inducto;l g,h/n+ k)oyft6hhx r 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 of a 2.50-mH co*k6zlg1e kb w/il 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 crqd bj7d*mz/57o/ gca 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157b 6sy)0zq v3iz 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 b.ndfr286lao inductor when 120 V AC at a frequency of 20 kHz is applied to i6.r fna2 do8lbt?

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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 2wrl:n8k vj 5tq8fmje6t5p wgv4,23 p p.50-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./do 3tpwjst :0r( 6vht7-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 capacitive0eedw5 .3 xkeak74nlp reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor b-duaei:,mw0/ ia jo2 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 reactance of a 0.010-mF capacitor be v it/lb,.,u dgs58 4qjdcc 7ib3jqv)x100 W?q x5v)dc uc g7 .q,bbjl/43d8 ,vtsiji

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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 thro,rai -tb8e 6ecugh 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 .y* sm msn84aaac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitia.ma4* nss8 myve 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, a+f n n-: ztl4vzf.8sgynd 1.0-mF capacitor are connected iz4fz+y t.gn lfvns8:- n 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 rr lsr lafihks -b.aekf)5w,91n+k ,w(esistor, 20-mH coil, and 1.0-mF capacitor are connected in ifk9-sn5rkr,h bw a+,()e.flsa1 kwlseries?

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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, what i-q-,a9yi re qks the impedance at 1000 -ie,qrq-ka 9y 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 i3/ie4r 0b*t- aasgg w;lg. ruukln62 inductor, what is the phase angle at 1000 36 b g eia- *.nur0a;sggk24riu lwlt/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 coimlk)+ 3p 5yhux,it +ozl and 1.0-mF capacitor for a total impedance of 100 W al5u)p3ymxt+ hkz io,+ t 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-W resistor ar)nf/y248;/fcmweob * llvmdnd 15-mH coil to get a total impedance of 110 W at 2000f c2m/e 4l;*mbdynl) v8fwro/ 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 inductoj n7:zqqhw4uch*3 o) hr at 5000 Hz for a total 4*u3:c 7 o)whzjh nqhqimpedance 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 in series with y bs4(j9dh p*kgmow. *a 100-kW resistor at 1.0-MHz for a total impedance dkh .wy*b sp4mgj9o*(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 seriud9 1d;pc*te 4hnbv:res with a 20-mF capacitor. What is the impedance at 1004h nb:;c tr*u9 dev1pd0 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-cva9 jl*99j;jox t1a ey1g wnu 8y0hy a total impedance o19ajj;j y9 wv1- tx8y 9nye*lgcuho0af 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 capacit) xr fb98ldk:wor at 1.0 kHz for a phaser:9kwd )8lbf x angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 t12)lsws 25rvm8oa xpgm-b.i kHz for a total impedanco 5ap2g.x 12 smbtrs)mw8v-lie 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 wiswyv x6z,. 1*hm lfkw;th a 100-mF capacitor at 120 Hz. What is the phase azwvlfs6y . 1w;x*,khmngle?

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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-opnqnf 9:n+v/ bjmm .xu;i..mmH coil, and 1.0-mF capacitor are connected in s.nmnnq9f.+mv ip oxjb/u: .;meries?

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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 0fbuuy1qv5 mojf:8k0a 100-W resistor, 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 the circuit?o1umu80yk f j05f:vb q

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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, at/1kmj(p2 jymnd an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circum(j12pmk yt/j it?

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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 containing8r e v*o.iqhuydl/m3: a 50-W resistor, a 10-mF capacitor, and a 0.45-H iu*v:rhe 3 mq /oy8ldi.nductor, 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 phase q5 q3d lv2neu9o seyu+;.r: rsangle of:n;u sv qreu2ero9 ysl5.q+d 3 $40^{\circ}$ 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. fggt -*v-j.yd At what frequency should the circuit be driven in ordevg dyt. f-j-*gr to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W dq(yxhn-f( : k js:y9winductive reactance, and 10.0 W capacitive reacta(jxq d:-fy:wnhsk9y( nce, 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 cir4 ay 6wcgmycv/ c)mi*1cuit 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 anob dvc:ktb8m l8 5;iw7 impedance of 60 W and a resistance of 30 W. What ismw8 o b:itldb; 8c57vk the 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 m xjjxom,yc,-e c1a(3a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, anj mjxxy3 ,acc 1mo-,(ed 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 capac7 );mh 8f2mm lxbln7lpitor and a 15-mH coil in series?8pmlh l;n277m )fbxml

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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 capa4xd1g i,jpd x;citor for a resonant frequency of 10 kHid,gj4 x d1p;xz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fre a6ruy0 smo)g 4a;h; jnq(at5numh6.yquencya;.a4) (6y5uh6 h 0any;mnmgor sqjut 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 mg)dx:-1w n iamu pqds/hb)z-e0p w9c5ust be placed in series with a 30-W resistor and a 40-mH coil if the dhd0)i wapgxb-:c-1spzqn 9u w/e5) mresonant frequency of the circuit is to be 1000 Hz?

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