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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 exy9n3bga m o*y:cept

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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 theig hr +4zebo0dcwx*/: $emf$ 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 wiry);s (4k+rz+m, -bvs pijas8+m hwqgme in a coil produces what kind of change on the inducedv4m8(-rpz im as)gmk +yq,swh+b;js+ $emf$, 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 pkve -7:mk0 u+fyh ff0magnetic field through a loop of wire produces what kind of change on+ef7k hpffm- yuv0:k0 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 produces what kind of c(ni9 po7t(f*wzn(iz o gt-kf9hange on the inducedzt-((k *9 gnzo9ifnoi (pftw7 $emf$, 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 h-s/ lelda6 b bu m5:bqs:0dd9a 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 an induced current in q*z2 eq7y-f4wkm jq*na conductor will be that which tendsy*-qzf *4wm qj2 k7qen to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held lu+c 69aowefgxa0+;.m )dcbjvt1 jf 9above its center with its north pole pointing down. The statcdtx ol; 9e) fc+wbf 1ug 9j6+jav.am0ionary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is* otwzl 4f;eki.t5/yjg0b9fn( b enl: held above its center withf0.5* twz/jy gl4b;bfo9( lkee n in:t its north pole pointing down, and released. 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 taby(cbh;n ,3pnpgsty+xp)o 57u le top in a region where the magnetic field vector points straight up. The magnetic field nn3y7pb )5(c hpx op+ts;u,ygvanishes 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 where6j3gv* bz -yearku:9pd8 cl4 d the magnetic field vector points straight up. Tc4zd u g-l8ekvjy* d a93r6bp:he 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 t ck3mlue10 x(rttlpomi 95q80 he magnetic field points straight down. The magnetic field disappears sump 8kx(o 5uq0t9lr 0til3e1mcddenly. 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 tabt0+raa)g2p4 7giag fple and carries an ever-increasing curren2)0rpfg i74ga g+t apat northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls throuk((caorh:o zx- z-jj -gh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will(-:xacorj zh o-kz- j( be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe4a- ywrx6nhu1 n/jnee.y; v3t u-m*ru ed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mus j4 /;wm *eeyx uu rvt.anr-u1-yhn63nt 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 aboba j )00ihx7zuut an axis whose direction can be varied. In a region where a uniform magnetic 0h0)zb7x jua ifield points straight down, what must 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.wfylo2vohzx 430 .5sa
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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 thadbpkk :wjrv) / guab/46ka2 0rt an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fin8:k:enmr4; dczt* fneld. 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 4:ibdfof .,xq9vq:zg direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across f,:bog x .iq4fz9:dqvthe rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotatesi2pbz- tiv hx3 4a+9 23uyryml 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 c b u+no9u 18l9kw2,ecqcd*dlforms

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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 revolutj19m x biv7x;dions each second. The frequency of tmv1 79;jdxbxihe $emf$ 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 used edi tubhf6rtw5((u* b-;jjg, to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tpy ,gfk7llj)thn soust0 0)mt5: d 2b7hat

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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 o//t p 6ll6fdccoil contains more loops than the primary coil then it is a/lo/cfptl66d

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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 u ko a8n fc:ztk.i;063gk/je gm2mcc+contains more loops than the secondary coil thenk;jk3g n: tmk. g/02ocu +6mi ccea8fz 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 pow a7mt)cvsz+z0tv npsb nw(w-yvz6 og; .a/o+ ;er 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 circuivz( sabz wq6u l4.38zwt,

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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 inr9jmc. m4jbde:q, m t*ductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made witdcmt:*j9. qr,ej4mbm h 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 connected in serd 6wyv/nv8m+o ies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the induv 8v/dn6m+ yowctor 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 resistb yqo56,mi3jo ance 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 is connected to an5bpwf i:r8a 4t $emf$. 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 ( len kpb3e-x.in series to a battery. The time constant for the circuit represents t-kpb (nl3 .eexhe 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 co 8* rznfjgr*)knnected in series to a battery. The battery is suddenly removed from the circuit. The time cof *8nrg*)rzkj nstant 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 havn1bj lq:1)rgj -erz +elyw5m .e the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to 1 qmfe*;ato- lan AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In th b,a6xr 4vl0xts4w-3h*kizz d is circuit, the curren xz 4wak,sh it64vld3z bxr-0*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 hm9tc8fn2 r0n-ws6i g-bj2 xkwhat factor when the frequencn2bxmwi-8thg f2ks c-r6 j9 0ny 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 inductor is doubled, the inducj -d r0r fb(qj9crgi/lx0(. yj 8tidt.tive reactance of that induc8 xrrdjlt -0.0 g/d(b9fcjtr yi jq(i.tor

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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 acros gu8.-1wakq l ecp2h4zs an inductor approaches zero, the inductive reactance of that coicq .h-2 k4apegluz81 wl

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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 t/0 ajq*/ l6mmq tl2ghepr , :gp3w34r ne/pblto an AC power supply. In this circuit, the current:mjepp*h/3t2raggn /r0w/l6eq l3qptmb4 l ,

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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 acjb /zba;3 u(0p6ntfcl circuit changes by what factor when the frequency is3cf6ab/z;0 ln tbjup( 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 capa oz-ssed;0 qf*citor approaches zero, the capacitive reactance of that capaqez0*s dsf-o ;citor

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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 td4r8r xvd-rg) nbiw;nj ps0;(he voltages of the inductor and capacitor in a RLC series cidxvpsn;j; w )-(b 0g4rr8idnrrcuit?

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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 cir +rj.wb z-:g1oxgoz3fcuit 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 l4edkepboh1qj;w .8,xf: q b3the circuit increases if R increases. When is this e3x; jq:4lhek8pdq w,ob.fb1statement 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 mwwvk0lq ;x o m3od3nr4r/g(9if $X_L$ 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 circui9r8k(9-dgi /tpt jkhy1hknu; t. 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 c gavj(gu pn1jcj+n8ki* (u 6 /bw1zbs2apacitance both double in an LRC series circuit, the ruj1ip1cjbzwv j28ng/sb6 (a +ngk u (*esonant frequency 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 an AC applied0ywl ,4ontc.sa ,c.brt0n cb- voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit oo( 55lxlnvesbd8e3 8sccurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic do7 /ccduu gfbi-t 0)t:u3vxpagd /.7 field of 0.20 T. Find the magnetic flux through th xtadfi c/c up udu:o0/g7 73tbvg-)d.e loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fv c3vco+h -6xdhf *mh2ield of 0.20 T. Find the magnetic flux through the loop when the plane of the l hdoxfhv6*mcvc +2 h3-oop 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-r;4 zf lrxdh6 in a uniform magnetic field of 0.20 T. Find the m4lz6 ;hrr dx-fagnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop isxe +o y+33icng 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 changh.7mc gqh d27wj*si4 0ho ()ecb4dscbes 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 frame with;kv8 t)hy7xsa n,c t*2h 1po,bbou9sb 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 ;hybt, 2cx ost noh8 ),7pbu1kvs*9bain 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an o;cn04 :)y)(rzr2ul* de0 o bcwoaq tsarea 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 j /l2(f/uhvab0g2b gm and 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 horizontallki cs wx83y42uy at a location where the downward component of the Earth's magnetic fiel s3yxk8u4cw i2d 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 rotaty g. 0a6janm27f/cgqzes at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its endsm76zg ancj 20fyg.aq/ while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional ;lntq i6r9/bcnv1 co5yc,di 4j,(0rxg ol+ jq 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 ofld29szj 2 :gtv 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 897gp. e;ckdnz 0 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide.c9dzg;7ek p. n 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 , lejj qcc-u*yn 6l(2yof 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 generator with an out+.kqj7tvmv r( put of 12 V maxik(r+. q7v mjvtmum 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 with a maximum hc v+kn6+a4sglrn )we25o* c 3 frj-q2jm+kad$emf$ 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 mov)iq;h 7k;f0om 4dghszau3y-tor 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. Thuq8d 44,6 wfbcs-ecphe motor operates on 120q 8,6ce4 4fsh-bpcw du V AC, and 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 internal2+yvedgiog/ :5ytqm+ p :dz8 m:-leph resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. 8+iy pgt::oyzl5 mgh p-d emved /2+q: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 res sv*qxjbst4a wzw+;tcg ;(zuu 8o36.gistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is ;v .tu +wa63sgzqj; (u4swz xgto8b *cthe 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 internfgt5 qa.c/o c/ u5hd,q(p cs6aal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the backacdgcpu/5cqsft,.ho a( /q5 6 $emf$ 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 9kd+ rlp r72nyis needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer c,m:ln2:)r 8+2 qcajtpbu7bbzp* .q3ahabmbf auses 14 A to flow in the secondary. How many turns are in the ,h8)mb7p3a2njqar lub*2m: q a.+b tbbz: f cpsecondary?

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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 anf rwo)0vuuh8 dt4;qy.z-5y ire necessary in a 110-V primary if the 24-V secondary has 100 turnifhuow yyztd; n qrv)05u8-.4s?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists u8p .vorzzpn g9 p;s 7q/-e 9pbfn1ci-of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?b q./zvnpc-9r sfp-nu;gp z8e1oip 97

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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 fp2fb- ;f1(iz xaczwk3(9 pewip+ +czprimary of a transformer. Assuming 100% efficiency, how many amps at 24 Vifx2 cff;1piwkz bpp 9z(c3(w z+-+e a 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;)(1a7trb0*e4bi4eebq+)hkri / utaprpwt g 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primgp0b/ iw)(ree74 ei k 4rbq*u ;atbr)p 1that+ary 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 and 300 turns on its 8vjp6li5bbrz/ 0 cd9ri05(qzza gdq8secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage i riziqzd9ja(6cg8 qdb 0v zl8r/ p055bs present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sec94dsnk4 li dc3ondary coil. If 120 V at 2.0 A is applied to the primary, what dksd4i 4lcn39 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 ha l:wnrom;7m9cs 100 turns and its secondary has 200 turns. If t;rnm:7 9wcl omhe input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and 0k*xa6-g :n19)ydj nanmbq cx its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of a1 :y n0g6*-mbdn 9n)xaqjcxkthe 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 haz 4vsqkfl--3n,q -c jbs 100 turns and its secondary has 200 turns. If the pcsn3 4q-l-k fbjz,v-qower input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is u x+im2ba)iv tmczo3:9sually stepped up to 4500 V by a transformer and :a im9t+v3)ox2mbcz itransmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 9v5 oip 0lca-oA of 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 i50apl9c-o ovlost 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 12ceru( brzkny6segnlph,2 f 8 0 ,cr- qz,.nw4*0 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 transmission line if the voltage is not stepped u*f8cb re p2s-rnz c(4 l , ,n.r0q,u6wkzyenghp.

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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 totp wr*w:2)d vmmal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transforp*v)m w2wr:mdmer 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 i6:y14dadj2vv qt /f qa total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with ydd:4ft iaqq26j v1/va 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 transmittedjacw7yy1jrcl ;8cb4; vc, z. t down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at .,al1jwj7 tyb;;cyc4c rvc8z 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. Iibdnz 0 by0;ko:sx qbycl/0 sl-4g00n t 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 00qlb-b o b00 4iyzxlk:/c;ny ns0sgdthe 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 n, eygx2uq *m5is stored in the coilg,2e 5y muxn*q's magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor w.s3 pme/ gk9qand an 18-H inductor. What is this circuit's time co.g9p/kq mew3s nstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rmv1.02hj :a0qk i gmpuus 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 120negyj.pa l8:8 (g u,yd-V AC outlet. 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 reg v6 9qr6a( q:2 hycfu6dllow*sistance of the la6:woyd u9qh v clqa2l*6gr(f6 mp?

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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. What is the peak curre-26:pnx qdjfi nt through thepiq 6 :ndfxj2- 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 connecaa k rog (ha(2o9yjhn77tf3 v7ted to a 120-V ac power supply. What is the power dissipated in the 3gjk7(ahv9a7nao7(t ryh2o fresistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ibs su2;opc1jw .pq,m7s $I = 0.80 \sin (240 t)$. 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 resw3 j +zcc) a.ibk)tm:zistor 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 ao tk 8vt0over7stc30 ac.i 5w* 50-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 aq b*l:m2e;hs *yj+wc+3qyf y n 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 10awi)cuu i8n snkg6 ./;00 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 o2t9 cpv xk35ixf 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 157 W of inducar(0pbukrhr: wm28tr/ ady6 7 tive 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 s o5ok zvd(/w4at a frequency of 20 kHz is applied to itd4oo w5s(v/zk ?

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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 tokfav3c.* r:h dnkj11w 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 103 bg md.+;tt yj:whu;h 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 capah17 ( jff5gooqcitive 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 capac:* ogo.wtxb, k k6*fdtitor 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 oja d.3p2b1nkhmks4e* f a 0.010-mF capacitor be 100 W kpb2h.3m adkjns e*41?

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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 btm, o.v+iz*/yj qw,gb74rmjugh 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 ci;hnas *041pt7pta v5wz-d2hh: s mg kjrcuit with 12.0 W resistance, 15.0 W inductive reactance, and 1 p0wn d s5z-sh1pv :47am2hjta*kt h;g0.0 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 imp*,;me bd ny b0ypyk8q0edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cobybd*m py 08e0ky ,;nqnnected 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 anglez1dw id*hu/d4vn nyi0e9wn 9; at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ca1dd;94i/n *unzwvd e 90 iyhnwpacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor ist-.d(8k l xlcz2t* a iz m2l-e;uyjh1z connected in series with a 20-mH inductor, what is the impezd.-lxilu 8 *ttma1(cle-;2zyjz h 2 kdance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the p6v e4(h (/rmd +cdc kblwro2i.hase angle at 1l+ .rk24cddm ove6ic/(( bwh r000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF ewnce1hfj pk/r-062 m5l8mif capacitor for a total impedance of 100 W at clkwf2 mnree8j 5i/h 610mp-f1500 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 with98t11,/ wb xrjdabai i a 100-W resistor and 15-mH coil to get a totadb waj,ia 89/1txibr1l impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH i8 3qjw0z)bpkbnductor at 5000 Hz for a total impedance of 400w z0j8bb3k) qp00 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 0)9z.ad(3+m xxtrxmqrk ; xxor)nu9yput in series with a 100-kW resistor at 1.0-MHz for a total impedance of 1+ .k(;qm0xz rx3n)dmx a o9x9 xtyrur)50 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 connectedmwf * 4)- rq w1j9w8gjzwd;o)iqkq7jo in series with a 20-mF capacitor. What is the impedance at 1*wjrowzj8 )f7 1m9dwjqkqq;)o- w4g i000 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 needee8bn j87y dd/d*oqw7)epx0dd d in series with a 10-mF capacitor at 1.0 kHz for a total impedance of* d87p08ddodn7jq) bdxe y/ew 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for ado5ve2. uxh+t /st 9+p35wwbj urkot8 phaseo5 rdb23vw 9xw5/+teu jsk8.h p+tuot 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 nxlzu wpz3ibmc18e8+ ( eeded in series with a 30-W resistor at 1.0 kHz for a total impedzxpuz8il 13(+w 8cbm eance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100z, * hnwil0u(igd,we2b /ho r3-mF capacitor at 120 Hz. What is the phas(gub i20*, lwz/,hdeno 3rih we 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 at 5.0 V and 1500 Hz if a 1;vd-8 ds5 xap9i 4r4yrliw0sl00-W resistor, 20-mH coil, and 1.0-mdri vpsx48; sy- 0rwi5l a94ldF capacitor 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 capacif6jf )qr(n / .hy.zf5t.tbpz*h pwwe9tor, and a 0.350-H inductor. The circuit q e*zth p )5wyf/jt.fz.pr 6(wh.fnb9is connected 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 capacitor of capacitive r,4e;; pursozmz-0 1s /rpgs eprk5m2reactance 30 W, and an inductor of inductive 4-rpss ;zou5r0 pprrm,eze /1km; 2gsreactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, atth4h 1xmh/r ,zkvkfx, 87vh) hc 3m5l 10-mF capacitor, and a 0.45-H inductor, when connect lc8v4hkrzxf,kt 5mh1h h tv7xmh),/3ed 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 rej 9 91by5hbkmp0,2ejrtel b d*sistor for a phase angle ofb,t 0m21jyl9rpebkde 9h b*j5 $40^{\circ}$ 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 circuittis5+5 *xdtba*c b:cb has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred ts5iad bb *+c5xt*b :cfrom 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 cirtjqgx; z0u;hf 45z 6pvcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti4 5;zh0fpq ujgvz6tx; ve 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 ciqf nsvkara6*fx1k42h /i (6iwrcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of m..bo;yyp 8j a6taa7p30 W. What is the power factory7 apam6yj ;..op b8ta?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W r)vn2gfbjqsi8 +3-bl oesistor, a 10-mF capacitor, and a 0.45-H inductor, when conn )no-+l3gijqb2svb 8fected 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 frequencyac;5;gz48p q f 5bowgt of a 1.0-mF capacitor and a 15-mH coil in series?c g55tz;g ;4bqapo8fw

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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 cap3 ;/qaehesmo7acitor for a resonant frequencyes;oa hq7e3/m 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 3.7c-9dedi/p)y j -mH inductor for a resonant frequdp/9 ydc- )ijeency 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 sea dtqe,ky-s44y q x+b*:i x)riries with a 30-W resistor and a 40-mH coil if the +-trsx) 4dbk:ii4aq xy * ,yeqresonant frequency of the circuit is to be 1000 Hz?

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