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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exceay-0rtq81u2y+kk5t x1 kae kx pt

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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,07 ,a hsz+ cqbcqu e:vayokh7 uw5o3zym.,7a 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 l k* q143js1+nw(dxp5i+x+h ngoluaw b oops of wire in a coil produces what kind of change on the inducbno+djxh 4isun w( 1pag*k35lxw++ q1ed $emf$, 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 produces whg- r3 iv-cgk7:itvgtyxd; 36xyh) k)uat kind of change on the indu x7hy g c-dvgkik:)i);tg3 6y3t-uxvrced $emf$, 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 diametefqli36 8nfol;;ev :mor of a loop of wire produces what kind of change on the inducev; omoeq;fi 8 :6nl3fld $emf$, 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 4 mq e-i:q-qkjfield an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an indu xh51)oj k bhy uoln2yr9tq9;+ced current in a conductor will be that which tends to produce whic9q+ ;ouxrt yhol h2j159)ybk nh 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 ot.+duht;r;i; ic92hf *vm1mupm8-t d:s twfp n a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnht* 9hc:p ;pd1 2t t 8vtuwfsm.m-iuif+d;rm;et 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 ,l efh8xfy:01b5hdiv a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the :bvei h,1x yh 80lfd5ffalling 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 wo)oz xfn5732qupg:bv here the 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 fi :7 fz v5g2ubo3xp)noqeld 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 levsap j4c9jh7 *ht fo+q+el table top in a region where the magnetic field vector points straight up. The +ho9q+jp jt*7s4ha fcmagnetic 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 ma*walxq0 u9rv5gnetic field points straight down. 0*alrqv5 9 xwu 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 afz9.qr9-9)t na zd +2 oedioxl horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one ond9q ntzo99l )-ozfe+r adx.2 i either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop o i*wsx;s *m6/tl d6alsf wire with the north pole entering first. As the north pole /ws;6 tdl*x*ls s6im aenters 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 angula ; .o.gvnlnf/er speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be t fveo; g./lnn.he 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 constan4g tt ngq1;agb*i ig53t angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation i*3g5t nigg ;ia4g q1btf 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.rw g, f 3lrzkdyxt+(gv50.h8r +rzad6
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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 u1rmwl1 /jq b-q .zr)uil:0ocn $emf$ 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 field. t kqy ;fpk5z+q)35 lgv -pmqo* b9jph: 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 nortpf7orp)hykh.gb77 6 n2vsnu sxk ;r/- hward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.-so;nrnu phbs./62 7py)vx7 h fg7rkk

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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 roa-q5zw spo ri9c1.cg1tates 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 generatoom8lg.s3rxn8 l: dj (ar 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. +hx3rk z38.6f ax yojzxk3-glThe frequency of tkrxygz h3o8kjlf36.x-x 3+ zahe $emf$ 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 devicex +dc vf0u4vg9 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 devicet,v *3,bwc1; tqjebe9v;ly hn 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 l q n-gtr(ydje;w +)3xuoops than the primary coil then it is a)w;dn( xeuy-3+jqg t r

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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 primarl q 3 e49agse*klv/mcb;xz xs/u)y+ d7y coil contains more loops than the secondary coil then it iglye37lm4u+9svsc zb)x ae;dq/ * xk/ s 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 powefkl0s3cgns 3 c5m0ux z;q3z *ir 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 cir+d3 v+4ge.xn jzt4i frcuit,

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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 c6m xm;vpwi 0hkp;g1-lonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage khgmpi l;-m1vxp0;6w 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 inductofs,+4 ku*gz/dfmjd y 5:lie6nw2y (nvr are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the,/fyn+w i vk5 4u2my6ddj es(*:gn lfz voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is cw 6 w 6ua5lz3i1mhi3qsue4c1b onnected 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 +e,foj.u 3 oikR 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 connectz y5+dh77: nczjf qg4sq9w,l ted in series to a battery. The time constant for the circuit represents the time required for the current to reachy4c+zgj9:5qt zsw,h7ndfql 7

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series 0wu/69+; v)pg7awv +m o pi*ykrhxuqc to a battery. The battery is suddenly removed fromxa*c rhuv ;q7ku po) y9v+iww g/0pm+6 the circuit. The time 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 spn) xm/s5r00h 1 5maju/wkbq vame 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. On this circuit, the currendsrqj( bw ft*/(r q6ezx :8.hpt

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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 connecte/h z+xc,zj4 8 bvki:m)(mh/m pn sth)od to an AC power supply. In this circuit, the currentk:n,/mh4v )s(hoz 8b/zt+)hmim j cxp

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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 anq 9tayqpaq ,wnqo 01)+ ac circuit changes by what factor when the frequency is trip )0q, +napo1wqq9tya qled?

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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 inductwk7i1 w7splwlv0yd k67 ) zz(yive reactance of that induyzzs7y1 670(dww l) vki7k plwctor

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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 inductor approaches zero, ghg5:ln; u x--b-6e0 dten3nttr6 ec wthe induc 5-xnr:uwg-t; 6 tcglheent6-e30nd b tive 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 connected to an AC power supply. In th7dlnssu;-c c+w6v)bv9x , 4 h8n gg mphocr6;sis circuit, the currentxv;s ,n-hc+orvws6lpbdcu8s h mg 4cn 7)69g;

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance i)b:4/ae lth irn an ac circuit changes by what factor when the frequencylrt/4): ebaih 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 approaches s )pn0)a;uontzero, the capacitive reactance of that)n0 ut) oas;pn 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 induct rft-/hyky/ p:or and capacitor in a RLC series ch/rt:y-p / fkyircuit?

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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 circw4cfr u0xloc g2a6+ o-uit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ic*7dcri :qluq( l wbcr, 69o rs+dk9)ef R increases. When6lr+s b* c:irrq d97) (eclcdwukq,9o 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. T nd((zx 8purnsnv*-83 :3;oiggazu/e xw*k mfhe impedance 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 serig k; 4,;pc40bu wladyn a1x5fuir0va-c v5(uues circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series cir;u3 w+ aq ndqw8pi bri3+)wiw5a-lm+mcuit, the resonant +)i3m umalw-+ qirn d5bw8ww piq+a;3frequency 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 bm9 lznjpb7)6sly mq:0y 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 bzx;pao55jk /4- sikxRLC circuit 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 ral;: z0buq2jw.q:gf h idius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field z:u.fgbjqi l qh:w;0 2vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielv6osw5p9 1f4t o3fishd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicuwh1vo 6f5o4pst sf 93ilar.

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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 rotaf) 5 0(c9 ztjvbaagts/ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a)c0avgbas(t9z t jf/5nd the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjusta5.c*ugn eax gg5f7dxa kbo))v9,ah*m ble 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 cha m 1;d,bv u9*m;c id5nz vveg6vf5 .oz9aes;tdnges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square framef5s4wf f/ 7oilt 87v(pgg+nwt with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes g5t lfwi7/+n fwpstf87 go(4vuniformly 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 dm:ugiw kl267with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns mh0nh h-hb h17and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location whe acl ckw-wu -sk cw34y869hj:v+2iivo f+n4jzre the downward component of the Earth's magnetic fielwi69woc483+u-hn kacw -k j+:4 vlvzyi2j cs fd 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 con1k mz3n qw6hxy,sv o7zh96d5 wstant angular velocity of 2.0 rad/s about a vertical axis through one dsvzhzn9ykow,63w 5qx 1 76hm 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 my9k-i d6pfi7q:6uuji ;wl o.has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arqo9b )mg*ghmuzm8s j8p-x1 103jcg n rea $0.090 \; m^{2}$ 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 rectp1 pf :o+0nb/wux g+gdangular 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 magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the ob0u wf d/pnp ++:xg1gmaximum 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 ntgu k1ew2oi-b9(o. b 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 simple AC geneqhkkb(e 1j ,gs;35d-r9pr udlrator with an output of 12 V maximu1,grd-9qj3shp; l rekb( ud5 km when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wb:i5tfc1x.k c) qnh zf(wo+s9ith 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 resis:d hw 1rymaq 7)r4ft:,yv0igbtance 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 resistance of 6.00 W. The motor ope gj *cf tl 1d7 (4z1wf-q732) lwjtuzaj/omamqrates on 120 V AC, and when running at full speed it generates a back tj7z l d4m-7)ql 1juoa(2/t wgf ajqz3fw*cm1$emf$ 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 h6 kd--0k:v ldwqj*k7ucrzs/ power supply. The operating current is-vzdh ucr/*-jlk q6d sw7k: k0 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 internaxs)bz 3q,v/w*gib(/a cl nno+l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. 3 bc/i sqx nanwo/g+z*,(lv)bWhat is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conngpvi0 n8ciqv + va.:(xected to a 24-V power supply. The op+ix.0pcn avq v v8i:g(erating 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 reduce a primarx5/f 7 h3;i jo6qvl(u:xijcys+ )aatyy 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 A to.g/ ea fn ii,n*k3 fpnsq.e; 3xhqab5u7z d.a; flow in the secondary. Hoa.x *5g.k3 n eszan pnbau,;d.heq fi;/iq37 fw many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V m)/om) rz2 t4 yi2tkqp-5manm 6ioo)bsec m)5 qk2azot/6io4) tmrpmi)-ymon b2ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a qd55 zd)-tigo2000-turn secondary coil. If the cuid 5z-t)qgo5drrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100%b* x yk rn+f -nbjxa4z(d+i.2c efficiency, how many amps at 2n2* -ybc+d r+f .a xb(n4ijzxk4 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 tra v(xk 2jho kd:.g aogku662xb)7 +dlctnsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does thx 622 dghgbk xvt7k:kl dc6a(ojo).+ue 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 anjgmkeflw;5 rb0 02b c n5tgh94d 300 turns on its secondary coil. If 120 V at 2.0 A is apt m5e lbhgw2n04 k0gbr5;fc9jplied 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 g:1gkv2c6iivr0- zhvq-0+g mwha7y r60 turns on its primary coil and 300 turns on its secondary ci:v+virv 2w1h6 rq0-70akgz y mgc -ghoil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hayxuix 6ba9 6i ns)9ce9,fgp m(lra5g9s 200 turns. If the input current at the primary is 100 ya9 smx(9 9nibpgf r auxc,695e6)ligA, 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 j(kpp(1zi;eyqk9sc 2c6cue n :68hum turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to(6k9yz2 :u(8 qpicj eh cnm 16usecpk; 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 tur+0a5b m*rcxx62jv sd7 yb uo0rns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary tb0dom7*yr xx0j5a2cv6bs +r uo 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. The99ahk .a9l dem i1 cxlhtv,(b+ voltage is usually stepped up to 4500 V by a transformer and transmitted through a po, cadvllt9 i k(amhx+.h9eb91wer line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 1f(vm 90ktf- 6uh5)mfq dui,lh20 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. ( fu6 95lvq-)k,h tfdfhu0immFind the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is fpv p,*9s+slg 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 transmission line if the voltage is not steppe9,sv *+flgpspd 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 resw*3cu98 r2 aq(gjr rn pj:gu/gistance of 0.60 W. A generato(rjqc g:a3n9 up *g28r u/jrgwr 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 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 resistance of 0.60 W.*k sj(vdzbt17 lz,h d. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tr k,dz 1*bv7szh lt(.djansmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted dodl,hufioa a7 m41p1r-b oenm, 4r-6pown a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of apo,m i-poa6hr, roe l1nud 47b mf-41at 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 transmi6l+m5vu jlf:p9vpy pg9d 6)yztted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up witvyy lp+9 j:6m6f5upv9lz g) pdh 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 5.0 A. How much energy is stored in th68x ncw )kjj emz00alpj.nu9 -rh;h,ue coil's magnetic fi8 jjpc9un une6; 0 zawm-krhx.) h,j0leld?

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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-Hzl1e )wgdb+9 svaw38o inductor. What is this circuit's time c 8ao +gw9ev1)bw ldsz3onstant?

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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 ACg9d e1)jnps7 kmvd 3 rbdxm-.1 circuit 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 outlet. Whatki a6da v.s/0o 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 xsu4 /hwyyhb7c;wwvf)i8l* /resistance of the lamp?iv /h;wxulcyy8s4w) f 7*b/h w

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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. (o-mi +s3mi/n8t g fvtzt.+drWhat is the peak current through tt+g fv+z/dm-o .it3r i( tmns8he resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powefe o/-3dcoa1r r supply. What is the power dissipated in the res1ro-d / f3oceaistor?

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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-Wf4bxswt:x o0d 9n at n+c1z)d1 resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W sn w)7+g9 lmiiresistor 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 ; l jb(:/xeqyfa9*co pqgv83b50-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 inductor c )ulugb8k4 8c/ux aoi2g:ahjkoo:)9at 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 reau2(y-yq2/-wgk q yb3nx hmyy6 ctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of bi1kvg*a+ 4z rinductive 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 necessa+9hdqs icw7 4sry for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequ rix v ,mdc2)ixi7wf;0cz+:1,jtatcfency of 20 kHz is applied twii) t+jd20r;7 ,c 1,caixc ffmtv:xzo 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 110-5m,0j7v3j )iadzlv mot3d( v tV, 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 reactan)zgw(yiv)l s.5ytdu+ce 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 ofswe62iq)bzkug /,7pacrtm: 3 capacitive 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 capacitorsd9,;r2s hob3qlb t 2d 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 capack/3tqtt q zp8 4wd.0zsitor be 100 W?q8ttw3s kd/zp0t4z. q

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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 kd3zu.rju*0f s73eqxcx 5mp.. mi c. dic0m1ua 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 xu06 (vkdmd5+nc6nckn36 supseries circuit with 12.0 W resistance, 15.0 W inductive ku06v5n3c (pnmdxcsd +u6 n 6kreactance, 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-zaj;wef:+ l (tW resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?+ jl (t:f;zawe

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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-mH coil, and 1.0-mF 7 p*plc-zz g:ijaar57capacitor are conni p-pja 7agzlr: 57z*cected 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 in6 c0 hz/i,1spwo sh*fz series with a 20-mH inductor, what is the impedance o0/sw pzhhf i6,cs1z* 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 l 5iq46msi ;vxwith a 20-mH inductor, what is the phas6si i5xl;4 qmve 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 coil4+m usds196sizjk0 k01jtj da bp64s y and 1.0-mF capacitor for a total impeda +dp s4ba00jkymu 1ks j s946dst6j1zince 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 capacitancnw1623xfy tc1s.wbfles is needed in series with a 100-W resistor and 15-mH coil tofcy .wbt 6xsn113 flw2 get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 45j 1x64hbaa+( d uq(fhd0-mH inductor at 5000 Hz for a total impedanch4af(6d+hu1xda q b(je 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 bvh2bb3( 7a0,hb q (5qkv twwjput in series with a 100-kW resistor at 1.0-MHz for a total imp k(ba qh203b7bvwvw q t,bh(5jedance 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 sem5elg01( zrmm z icf75ysvk 3/ries with a 20-mF capacitor. What is the impedance at 10 k3 svigm0 mmyzr5 75cfz(le/100 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 k.h jtmj -lm b*u:-0fm10-mF capacitor at 1.0 kHz for a total imtl :*bm.jku jf-m0- hmpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacito m*xju76 lriv t 2bjbzr-812ohr at 1.0 kHz for a phase axj*r2bvoj 7br8-t h1ui 2m lz6ngle 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 resi2win+beppmr ; 2c 3up4stor at 1.0 kHz for a total impedance of 45 W+e34;m pp2 p w2brnciu?

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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 t 2 vpkkpbwoc,0 *2k7ga 100-mF capacitor at 120 Hz. What is the phab02t kw*2vo kp,gpkc7se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows af5 z e ;/vgxhla21tld4 c+;fdct 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capa f/ z2 gtd5l+;dle v41acfx;chcitor 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 capt9oy1zkz3o w4 am+d*pacitor, and a 0.350-H inductor. The circuit is condko yp1to4 am3z *9zw+nected to 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 capaci/2bgsiub4ih6 e gq :n4(txq3stor of capacitive reactance 30 W, and an inductor of ini(gi2ue :4 qst xgn36s4qbhb/ ductive 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 5z3at 9.0.c2kxnu lwcm 0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz zalc0 kw23t9.mc ux.npower 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 resistojx+o;r4 re)2vfkh-i qr for a phase angle ofkqeor4 f;+ hvx2-j) ir $40^{\circ}$ 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. Atryv, 9h q8gyu9t2jj o6 what frequency should the circuit be driven in order to have maxi9hrjguv 6oyyj,t928qmum 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 ijn 8 zm rja,1v3q(l0cln an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuir j3l01lmc(q ,az8nj vt 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 2 )mxr3 )o)qt /fbzve/hqp yl60xkm *ocircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and b5 .nyi,tg4*eosa/xals( 7s0 whp k5ja resistance of 30 W. What is the power faceso 5pi*.haax4kl,sy0 7(s g/5tnjw btor?

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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 cl*0ci hdh*o; gircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz phh0 *;iolc*g dower 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 inaqi8xfj qo i-c78e5,t iyoi- 8 series?if,ci7 o-iti8xaoy je85q8 q -

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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 seriestly-q(o k29yc with a 4.7-mF capacitor for a resonant frequec(9ltk-2y oqyncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor f2fwhfd30 aaml/tu p+n -+: tqeor a resonant frequency of 1:t/-0 maup 2fnel3whq + f+tad000 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 resistor af /iab2 7s8bewnd a 40-mH coil ibfi78 wba se2/f the resonant frequency of the circuit is to be 1000 Hz?

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