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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 s0,t. -hr ly em6vq-pdare units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction staten :z 0tgrfju 7ouje4b/3 f1ee6s 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 )pim469h uf fuof loops of wire in a coil produces what kind of change on the ii f4muu 9h)p6fnduced $emf$, 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 wiri4(wa/ 1rge yxe produces what kind of change on the induced1 r4ya (g/xewi $emf$, 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 prodxq zp6i; sh).buces what kind of change on the induci;zb)xh. s6p qed $emf$, 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 fi0qnb e-fyb 44.tu3hmoog; 9il9h4zv beld 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 curfyg9j:5bz*sbud w)nlm h so:8; 0,vh f dy/4ozrent in a conductor will be that which tends to pr h nd9 bf4)s ld;u8fh /:5o*vzbzsyg0j,om:ywoduce 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 abov2, ec cyvzxg5;k4,c kfe its center with its north polk ;z f g5v,,kyc2ec4cxe 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 bc5 6ymxk*a3 b4rftx3qar magnet is held above its center with its north pole pointing down, and released. As it approachesx33 6a5qtmb 4rkf*cxy 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 reginfdjx79+c vmjb b8r +-0fsxt3 on where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensdvxbx+3+fr 9jjbnc- t80fs 7m e 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 taqgkezjr 6 :505jeb2xx ble top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the indb 5qgxjee 0rx5j26k:zuced 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 magneti:)do9ozu aapn (-(we;31ua yvz fl 8hvc field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fi1uazvov 8f() u:po;9ay-hna3 d wz(leeld 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 horizpi445yo; vn f sgqn;z2ontal 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 current2nyoi; 5zn44sp;gq fv 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 throug/j1*u 9im misxv0uri-h a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abov01iimjxru u -*/s vim9e)

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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 angula1ue-xhrvnwp z8/0 s*yr 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 ofwryv-ux08*pe h zs1 /n 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 rot5;6b evywc dj9ated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of theb5c 9yjvw;6de 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.q602lu k,fy mx( g0apw
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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 t875pkn .lz shko,s;rihat 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 azfwg(;r:vybqd0 fe dv*hx gba6.9.o3 magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in tnb97qlm; bw g/r k8/;7twgds jhe east-west direction) is moved northward at constant velocity7b9dq 7tgwl;jw/gkm r; bs/8n through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velo:nr w )q0-fxtnv mui9;city $\omega$ 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 transform bm:(gr)1vfw ru80ryps

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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 se qxdnb*t)l k +/mhl(-s9y gj:mcond. The frequency of the (bxld9 j:qmls)g n-t ky/m+h*$emf$ 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 +pillohjz t 6f98h :,mto

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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 deviceu/xk0i 4v 63*u x,qggvzfa+f n 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 t(iioj-ru)) )atfq51h nu 5ktzhan the primary coil the uf)jt5rq) ) znh(t15iaik -oun 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 secondary cov:0eb1i5bar9fxb,m x8vrwk 5l y p1:c il 5x5k, 1ax0:fmw:8r e ybl bvv b1ipr9cthen 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 power i)m rh6my i1..w fiy5ycnput

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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 cj-1h72pr (ucwnviau:ircuit,

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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 cotl(e+uq0 sa;qnw9k/fe;m:n)v6 e oihnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acroso; +smwq tnie ;k6e/9q(flea0n h )u:vs 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 series tffxot25f3,i yq1r;cv (3egv io an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thyc 2tfi;x r 3o,f1veq fi(35gve 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 s1ud91d2)ncrif8cm m 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 zt/ 7wzq6n1p khjwb0s 4q4gm) L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connekw 4/*h4x b bm 3fgkn7ls9l4*xsu pc/jcted in series to a battery. The time constant for the c3 /gblkbkx xp/ * l7*wuns49h4sjm4f circuit represents the 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 series to a battery. Tp( ben-z ydfc6osl6tl zc5 -h g,z-2e0he battery is suddenly removed from the circuit. The time constant for of the circuit represent(2 czgbd-nc ol -h6ple560sf-zze,y ts 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 sz3u*i59 x mhbvoecc486 o -dgvame 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 circuq r8bo gosl s3aurw;n.55k( v4it, 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 circuit, the cur282bplnski/qzpf v+(wp5z, mkx:5mdx;l d(fren p2mw l, f:(dp/q zpsz f5bnxmxi+lv8k2(5k;d t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fr9t-46+iohb yu 8jqn5v j.f jaxequency is tripl-6a4on f 9yh+j8xituq bjj5v.ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the A hy* ybgtmjx 7)d7b:/livi:. dC voltage across an inductor is doubled, the inductive reactance of 7jbi *hm/btgl y7d:i.):xydv 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 inductor approacheu;0ye9dczwwed.2b up:na 26dgo+u b, s zero, the inductive reactz wyae ou.,wn0+2;b:dg 6 9bd ecd2uupance 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 r;d(5 emkse 0t +(cgod9o5 mdmAC power supply. In this circuit, the currens g m 0(59mdedco5;dko temr+(t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit ctqb xsao5ro p8)(v: f(hanges by what factor when the frequencrfqo():x58a bo tpv(sy 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 tutaru95/bvr ; holj(/ he AC voltage across a capacitor approaches zero, the capacitive reactance of rh bo;utr// l5j(v9uathat 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 ubu645 kts4tw m59p ymvoltages of the inductor and capacitor in a RLC series circuitmw96sm55 up ktt4by4u?

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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 circ sg 8c8ks*d6tnuit 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 if R increas/ b 4d(6dmnwqvp).yfimp q e;rz(/gs0es.. sinmdpf(4z (/ pm; w0dbeq/v)qy6gr When 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 9qo,u :egwctd 5)mc1zimpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit i;j)kj2q9c qhiow*m 0;pg kby8ncreases 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 themdlw- 9;hvq -r2rm p.w capacitance both double in an LRC series circuit, the resr-lq.; mh-2rvd p wmw9onant 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 app(sg faptyg ;k vg v7.2xr/aj/24puy8uye:4hplied 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 rqi57t4g)lt/k u/u ohr;e6b fRLC 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 radius 0.10 m is rotating in a uniform magnetii*fk ; :c 3n5at-. dux11;cqfxjog orwc field of 0.20 T. Find the magnetic flux through the loop when the plane of thftuk1-gr;;1 : c.jc nwo*x3a 5iq doxfe 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 field of 0y4 yai-(psm.-3cj +lmhzt,f v.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are p - zvysya,3+fmph- c 4jmit.(lerpendicular.

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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 rotaggee1 ka qb660ting in a uniform magnetic field of 0.20 T. Find the magnetic flux thrb16g6eq ea0gk ough 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 ad*ymiisv)a w25 justable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coi vgw:k35se (1bpew /vfl 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 turns of wire on a square frame with si)j.z0yvyjv u) des 18 cm. A uniform magnetic field is applied perpendicular to the planeu0)yzj) j.yvv of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1 m35 7 zedtmqf10*vdfzj- tf2r5 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 anss8)lr0 (n)lwyz ;as)nyuwyg:0r,q cd 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 0xv.fhw;x zvt 6- a0rfwhere the downward component of the Earth's ma;0v ff t0rh.azx6wvx-gnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant .re kgh1f y*- :ywol)qangular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of yeyqko g)*l.:h1r f-w$5.0 \times 10^{-5} \; T$. 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-secti;z )0kog4ot ehonal 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 wkd7o o:/hi:c aire 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. Eacv be :2uox8eh3h loop is 12 cm long and 8 cm wide. The armature rotates a 8 v3bx2eo:euht 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 consisifs2*q/uu8ortyud 5 qnal8*4 ts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 gttk9jbcjbic 5d7c zp)s3 o 16*enerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the r9tc6ti 7j1b)dp kzbc * js3o5cotating 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 ge99,4eeej/e4m d8 p+rhrch nq-fdm 5a bnerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DCd: ocu kmnafqoy5 4g/ 53aw3g. motor have a resistance 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 havenvzet7h ,d0h7 a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bacdv,0h nh7 7etzk $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplt(crd8i l h4 ixss,3(-aa6oyly. The operating current is 1.0 A. What is the sta o lhdc4r3- (6s(,iyils8txaa rt-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 resist2ot*m9fcewf, ;a w,;q nfooc jmlv* *2ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back v*lcj*o,t,a2mo w of*f2cn q;e9 ; mfw$emf$ 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 l 5 u68wp+k + ty;tbaecv/:crw6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wha6e 5 c;pc/8u wb:tk+wtvryla+t 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 primary vovo c).lop19ind8 g/bultage 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 flow in tt lfy03+hf6pd he secondary. How many turns 3 fdp0h6ly+tfare 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 ag-oy/xrnevs 0v q-11u re necessary in a 110-V primary if the 24-V secondary has 100 tu- oxn1vr -yv/01qsuge rns?

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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 . ra /sjopn/k lvvzx25+(w, ay500-turn primary coil and a 2000-turn secondary coil. If the current in the j+azsov p x./ry5k nvw,2/la(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 tha:/ olg);n .2 (k pknompkuh7e*mst s(e primary of a transformer. Assuming 100% efficiency, how kke.n*(s ol7 skhpg:a u2m tmn )(po;/many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a ne4wbe,7z2 u*gb 9oishqbto x)*on sign transformer provides 7500 V at 10.0 mA. The primary coisx2q ,b*7*btwg o)ioe h9bu4zl operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tu n d5*c. uv77md3k6ljbjawn9lrns on its secondary coil. If 120 V at 2.0 A is applied to the mnja3d 577 vjwn9*b. cldklu6primary, 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 it f wht.uwxo13hl**d3ls primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is*lht 3 wx*o.udw3f1lh 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 seconda edib lt0rakqm05); r5ry has 200 turns. If the input current at the p0;qr)lt ik0e5d ar5bmrimary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has,. dk. pksmndk o vw l(j-e3ibutz41(+ 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secmin((dp3dw,bsko 1-u. tk 4ez+vlj k.ondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has0qnem j-1ak n.by-a5j 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional l-k1a0 bn ney.5qj-ajm osses)

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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. Th:5.nh0 zx.*spa6eeke pzmf 0se voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance psk.zpa. 0e fexhe:ms *0 z56n1.0 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 .h1mte5zmn*l+kmqid* x3ua/120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a +. a tlux5*/me3znhi 1 k*dqmmpower line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V.bt ,q ;h etyuw(3vu,,h 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 volt ( utv,y,h3;uewb,q thage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.4ihk nik5w2w 360 W. A generator produces 100 V at 70 A. In order to reduce energy lowwkhii42 3 nk5ss 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. A ;m +dzc7 x00enqnk66 y yt9uq)yb(9isp:wjokgenerator produces 100 V at 70 A. In order to reduce 67 m q(y xeo+):dj qt;iy0snw9b k9pu yn6czk0energy 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 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 dow:p2 .m,6jukywf ufw-hn a 6-W line at 1000 V. How much less power would be lost if the power were transmittedywwf:ph.2u -ufk, j 6m at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is avp 9jwf2vt2i,jts gw g9a+; 8to be transmitted on a line with resistance of 0.60 W. To what voltage mus2ja9p;g9t jv+w,t fiwv8sa2 gt the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is2ef+q40 5 whxig5u2rnls a;o f stored in the coil's mai5lh sr;exgaf wq2on u5+2 0f4gnetic 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 ow fyzf*t -8y;q .g;wo6.0-W resistor and an 18-H inductor. What is this oto fz.wy; *y;8-q fgwcircuit's time 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 pgpo xwo;u/zn 4z;-q +an AC 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 ACgv9ei q2 +ze 7k9/kcq1 y2gvdn 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 outlh8+qqlxm0 k pko )k-iuib5d15et. What is the resistance of the lamp?k d8kliq5 p+qi0m) k1bxho 5-u

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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 gv8o;r.jge wf6h5/sv1pe+es current through th6.j8s r/1w;5ogvge vepsf he+e 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 cjp8qry17 mk442;r5wzvippa rv;zz+t onnected to a 120-V ac power supply. What is the power dissipayq175rvr piz2pp kwm;r+4 j 4tz zva;8ted 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 redz29s bbf ,lf*e k y45s4+vxaqys 4krrpe v181sistor 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 resisto;i3grx1g*utk/ ijaa3nhb n 6 (6j0lxhr is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ik5 v.//t o:5rqguerip(2ucyg s $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60mvdubl iw,) 7s;uix4 8 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 1j7 tfvpw3oqh(m f+*c0 000 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 willp tpq(nef1 y4- a 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 157 W of inductive react0b(7dto qco7u z*j(a qance 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 120pzs 345 vnuie8 V AC at a frequency of 20 kHz is applied s48pnu5 ize 3vto it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcz 5c+m8oj 4gcz0p1 meye?

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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-auk 2ah8 shx, vt3jobm.t/ u7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactal1g) /,g h.fi no0k sjko5dcw3nce at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120ndg, dy4i mk:p 0vtb/)0 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 capacivp 2/ll owv.p 6fxy.)c3).h yots7hhftor be 100 W?xc.vh /7ovyfp w l23)o.ts 6 yl).fhph

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitoe6c qe5y5 ca)05r h fn64yezmkr at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 Wp.*m zv qej9.k/rd gdnc -n;k3q4bws)s9d2 jx inductive reactance, and 10.0 W capacitive reactakge2d /s)dnqmx*c 9w4.n djb rz;k spvq3 j-.9nce?

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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 Hzf6 uv879owb;+2n +/mhbvv0kua ogx i j if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in se 0+au8bun + 7km/;9vxhwjgv o 2ivbo6fries?

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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, a .51n2t )hx zox vu7i/ncdy2jjnd 1.0-mF capacitor are conntcj15z7nvd2/xoj) i h2yn u x.ected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induct jn28tf ;,onblor, what is the impedance atn8ljfb ;,on 2t 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 ixn x50jux*3uo nductor, what is the phase angle nxuuxj3 5ox0*at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.r)xe 4qaa7 3bo0-mF capacitor for a totalae )r34q7a box impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in semixo-oh(f2m/. 8k6dx4fa h p yries with a 100-W resistor and 15-mH coil to get a total impedancoofx4m .2-xfkpd/y h aimh68(e of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor a 4bezl igvg, n3m42pp3s( xy-pt 5000 Hz for a total impedance of 40000 23vnp-m4glzb(4 g,epp3 yixsW?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW rjps 4.wg8i o(xesistor at 1.0-MHz for a total impedance of 148( wg xso.pij50 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 serj(q ad/i ve5tb;alk.5ies with a 20-mF capacitor. What is the impedance at 1000 Hzedaij.b5l;/ta5 k(q v ?

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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 k*lo7k1w+k yf kHz for a total impedance o*ky k1kw+ fl7of 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 befjl 72k ln70kHz for a phase angle of lbj7fne20k l 7$40^{\circ}$?

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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 s;;s8o qg c3bp;wga(-ef k vyu2eries with a 30-W resistor at 1.0 kHz for a total impegevf wobsp kcq(g3 28 ;;;au-ydance 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 s f-.ht(+or9n wcupzh9 eries with a 100-mF capacitor at 120 Hz. What is the phase angopt-r.z n9(fuhhc+9 w le?

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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,qd-1 qc(ur2h vsc8 (rk 20-mH coil, and 1.0-mF capacitor are conn8-q sd1c hk(2vr( urqcected 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 f;y5kc:(hp ju luloqwyi+(2 ;consists of a 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 +;hf5i;( wcu poyyj2(uqk:llin the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and js hq2fwk2, js4)maehz)s j0:x)w-k:m pn fh; an inductor of inductive react), k0jpkwh shfhs jjs-2nf 42);a:mwe)q xmz:ance 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 circso3g,gm (o j 5)xkolm4kq)5 yuuit containing a 50-W resistor, a 10-mF cako 3jkoo ) )mu5 5ymqg,(gxl4spacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-b-lusj/ja cai7h*7+rW resistor for a phase angle ofj77/hc bua isra-*lj+ $40^{\circ}$ 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 ogb e- l7ui+krr-qyu),w2; ek, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the;l b-i-+)qokge uke wr72y ur, 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 7su7d / 1na87dmyho ikb2(vlgresistance, 15.0 W inductive reac78u(g n7ddkmob7 h l2/1viysatance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of ans-2w85dr5,n ,dc e2 sjchv fze AC circuit 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 ) debqmbsnv4 3l)0n l:,t +rhq30 W. What is the power mqq4bvt)sbn3 e0l ) r ,d+lh:nfactor?

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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 res/o0 uw)lk w,bfistor, a 10-mF capacitor, and a 0.45-H inductor, when connected t lkow/w fub0),o a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor anjrw:s q :-w jw0 *j.r9;acdahwd a 15-mH coil in series?a*-rd .wjr aq9:h:cjw0 s; jww

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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 cbu*;jrvnt;ialc 5 c(qs/4x 5lapacitor for a resonant frequency of 10 kHz?sa q5criul4 cbv5ntl; /(*;xj

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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 fq)w:da +*wfnv703cj zguopv.9 typ g4or a resonant frequency of 1000 Hj40*v3 p7v.ny+q:c auoz)p w9g tgwdfz?

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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 anfwy:,i8og95p aiue t1 d a 40-mH coil if 5og ,pwe8iyu9i1:tfa the resonant frequency of the circuit is to be 1000 Hz?

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