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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are unitu 3g 9ekxrtm5yu1)-dfwiau0 jb-d9) ns 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 stat815fuk gx- bstes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chan. hcz-vv .kj4kge on the h- v4.zkcj v.kinduced $emf$, 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 csb (:d7.mfzt wd-*wt through a loop of wire produces what kind of cf wds-*w:c b7.(tzmd thange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter or/intpu.fzj z k6j.m ycf2fml ):.7o6f a loop of wire produces what kind of change on the induoj/mfkp2mnz.c6f) ujr :yz7. i.l 6 ftced $emf$, 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 fiel42w s 9ke050lec5l iz wdr)+s)aste afef*5zn d 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 cf,ez+pkk ,5kmktq+ - yrn*.y1itp3 bkurrent in a conductor will be that which tends to b k,3 rkpy+.y, qkinkkte5m z+ft1p-*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 fla9/ 3p7nurgws )efvn58pxo w4at on a horizontal table. A bar magnet is held above its center/oapv5 w48s xw r7ug9 p3n)fen with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horiw gi ( skhsv3ov51k1ri mql ).;k3:nmdzontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magmiikl.q11vmk :( 3rs 5oksg)vn3;hwd net 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 where the magnetic field vector poifg5uh9v xp(e2q 26;r sj tga:jnts straight up. The magnetic field vanishes suddenly. When viewed from above, what is thexqh:9 52epja2 urf t6gsv(j; g sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magn x;8xj/d)m qznetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ) dzxxmjq/8;nof 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 tcj,es.zu ,:vaf7sl4u op in a region where the magnetic field points straight down. The magnetic field disappzc7,eu4l:fvsu .,ja sears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizoqboavj00*wko8 b(4,zpfi+g m0 o( gju, tyo9pntal table and carries an ever-increasing current northward. Two coils of wire lie flat on the4 9b8toyk,f z+apq(o (0b*mjojvi0 ogp,wu0g 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 throug-y-mo iqb4/,a f v3qyah a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current wyi-q/4q bmav- aof,3yill 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 3 n5yydul-4hu4zqc2 5;zs cjbconstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must beucds h 43j5yczy 2nb;z -4u5ql 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 rux5(1tgvo0 a qotated at constant angular speed about an axis whose direction can be varied. In a region g1xt0oa( q5uvwhere a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.+1:dk ide g9.cycy+ vf
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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 2y.tgwkyc,5 tthat 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 magneticcidsif sc bb3v:3h 46+ya6;9f uahs/lw0f 7ga field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward atwpda +sb e2b 0atu(90t2vuv8n constant velocity through a magnetic field that points straigpa0vn d +wtb9u20 u2 as8(ebvtht 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 angulae8f p v g-br0zn-jx-0ar 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 transformsif:sk9:g)j/ d ogw.wwy ++tktg 84vrjz - za,r

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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 eacla hf uqep2cu; w0ub/r;(zt666qh 3bph second. The frequency of th2u06wp 6(ul;bhe;afb6qptuzh3cq/r e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devf-tgu,pw3ew7 epdd;q gysq8e( q7 ),kice 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 devipe( 8k. rofjf 14vnk4mk36eccce 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 seco:urj u l v(fdo6vj2e h,,7o0sz )yuw(fndary coil contains more loops than the primary coil then it who0l,v j( 7oef uf)zv dj:u(r,62ysuis 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 coiy j4vhb5w0g--nk wlt6 l thentnh0 6lvb-kjw45 wg -y 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 powvgkii60/w8 zb1v, tb sk 9m8maer 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 resonal8f2+u;g2-5j) pbq ym 3zuh 0znaxtvt nt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in ser k0+ob if49poqies to an ideal battery of constant terminal voltage. At the moment contact is made with the b oq k94ip0+fobattery, 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 arsu3 b8yd r*3 bfbolk2*uhh,r+e connected in series to an ideal battery of constant terminal voltage. At the moment contact is mad l*8+ofduhr*bhysku ,br 23b3e with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and rea bluuv/. vp*zd +4rm(sistance 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 resistancenpxu) wxm no0i/ -y469ipjzpk. loa:. R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to ayp p+ exgwo :k,./ pjiak;4l-zov v4:u battery. The time constant : 4pw+peo,vy-/4la:k i ;v z.ujk poxgfor the 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 aregb ;tu8gr9:bh connected in series to a battery. The battery is suddenly removed from the circuit. The time cons:g tr8b; u9hgbtant 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 bsmx3j oenh 2d: 1m01usame 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 circuiv2oeph 4ggsvt9:65yway h-,x t, 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 p fh)sj3yk620 u 2gvc 2*ypik, (aacqlp3b8rk nower supply. In this circuit, the currenihr2 6jc( au,)2aynlp 8kv g s0fb2c3pqy3k*k 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*2hmz 1--he+ jbqu ;zenl rki7 when the frequency is tr-;me- * 1r ilhzkuz nej27hb+qipled?

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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 36 c dg-cnlt4j9ott)svoltage across an inductor is doubled, the inductive reactance of that indl4 6tscgotn 39)-dtj cuctor

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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 .sg; gp jeex,8:cjafd-u8(gtvoltage across an inductor approaches zero, the inductive reactance of that coi,j8s- .xgt e8j(gg;udae:fp cl

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, pr2 ocv93n/sethe currep/9recn2s 3 vont

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactasx dir y05p/ohk3n n/t.r;v2gnce in an ac circuit changes by what factor when the frequency is tripp t2d.xny/3vsn5;hri0okg/ rled?

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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 vo9/cj8l 9mkz u2abls0rltage across a capacitor approaches zero, the capacitive u 9jal8zsm/b9l0 r2ckreactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltl+al9 .rk *pe sux:;hpwxe2 z1ages of the inductor and capacitor in a RLC series circuitu :x; z91lekxwrpe la*h.2+ps ?

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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 ,lx*-u hjodv0,w wfy 7RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The igc)d0t3sw +crk o8rv. mpedance of the circuit increases if R increases. When is th +ko3wcr8cd.rv )g 0tsis 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 impedan qxemd ;*ijw;7rnwsj3v7uyck 3n,)/d ce 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 increases if r xq ku3gh2n )w+.24:3z/yp iyvjunzs $X_C$ 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 boto js63k2/hu r5xzmae -d0xv+xh double in an LRC series circuit, the resonant frequency rx-ev5js6ho d kxxz/ m0+ua32 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 g9pkp*c3ng rq,fx0kk6pv v05 that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occursrmpvrw/hyz9 : b 2a4dv6ixmz23pv2 c 4 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 ) faw-.nfx:6x (ryx hza uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallxx).f:( wxnz ry-h6afel.

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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 rotati*xnf8jcs9 ouhj4g( 8g-s)u amng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the an 8 )cs*juos hj(8xgm4f-gu9 loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is xip7r,3ws 3uy rotating in a uniform magnetic field of 0.20 T. Find iyp7 3x,ws u3rthe magnetic 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 si3+wzy7k251sehik-ow ti xhj 5ngle 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 chz n 6)o28 n1lbprdlh1 xae8n;qanges 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 200xmd k .rpappk1 e)9n+7qj6 n+s turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coip pk6dsnra k+pxnj91.q)+7me l. 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 wirevqpp7 u k,d*,n with 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 and aro.y jun) )d:zi62two+f o b,uzea $0.20 \; m^{2}$ 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,fm 8ieygo + rel1c5f j2ous10 m flies horizontally at a location where the downward component of the Earth's mageeiu 2o110cf+ fo myrsj5,g8l netic 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 angularec*ze; fc7ph8 velocity of 2.0 rad8fhep7zc *c;e/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross- ei.+:x1xxrf dw jf)s,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 lo p(*xf5l0oi wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops 5 fqz*h8*yz bnon its armature. Each loop is 12 cm long and 8 cm wide. The armatuzbnf*5y z* qh8re 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 ofxob xf,5eg uh p0g6)*j 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 generip8ea p( dk)-iator with an output of 12 V maximum when rotated at 60ep p-di8aki)( 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 genq4bl wahhi--e sob89:erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC moto - opck0 qsqb:*9gfzy0r 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 have a resistance of 6.00 vrg+w/)me xlm,,cpc; W. The motor operates on 120 V AC, andwxgcc mvr ,e,m)p /;+l when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is 3 k0eaxfj- od-up /bezf7l l+)connected to a 24-V power supply. The opere) jzo/b+x-lupk 3e a-l7dff0ating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected tkgwhr .h1fp0wk20nl 4o a 24-V power supply. The operatingng0h41kkl hwfp20 r.w current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. w9 dq9 tud bbwd(,df)v.,k+kz The operating current is 1.0 A at full speed. What is the bacf9z9b kk,vq)u.dd , +ddww(b tk $emf$ 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 transform.0wnyn8gx aion o .y37er is 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 primaoofq:o:kv tsuxb 0m+ k/ (2n,z7 ydjy8ry of a transformer causes 14 A to flow in the secondary. Hfu,:s2kj0ko 7 yxt vm+:b 8qo ynoz/(dow 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 tuvpw-4j;pb8hnu 5hjx fn (l)sn49fn3hrns are necessary in a 110-V primary if the 24-V secondary has fvs(n 5 nhpj4 h3u)j-4fwxlbh9p8;n n100 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 200q8cp9jknb 4e/yo9-t; fnkx -i0-turn secondary coil. If the9xf9kon-ek cn yi-4q;j /bp8 t current 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 of3w3)v 8ydxel a a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seco3wxey l)av3 8dndary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V atil gkpj(;sw b vz327r/ 10.0 mA. The primary coil operates onkjpsr73 zvg/(ibl ;2w 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 p)i jqcf 88g7*0z(a uq;(kkgtt8 jmdqrns on its secondary coil. If 1(;qc880k a8gjiz ft*qj)muktdq7g(p20 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnlu3).j3. k vc8jm dxr+5yqgfgs on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cur) 33. flru. q8jxjgv kyg5cm+drent 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/ qzhnby697bdf k0 c)y its secondary has 200 turns. If the input curr07)b9dyqhyc/fk6bz n ent 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 andd d3yxqb8;7niz:9- xi fzbup- its secondary has 200 turns. If the indx3f-z p-b :dqxyzin 9i 7b;u8put voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn c6if4yko2kyt,lw c; ,52hzvds. If the power input to the primart;5l zow,2vk khc246,f i yycdy 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 ct1; l 2kd)ooe60 A of current at 120 V. The voltage is usually stepped up to 4500 V by ao;lkc1o te)2 d transformer and transmitted 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 A ofeq9i.md9c -wm current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resi9m ei.9mq-cd wstance 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 1cq 2t zb:hpj6020 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted6zpb j 2tq0h:c through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lq5i5x;+dc1 zy fa*zk v1ig h-xong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce ener 5 d1g;kaq5-*1 zxfcixvziy +hgy 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 liamd2/l; dt.y+s j7u sdb2xz3y-ftf l0ne 50 km long has a 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 a transformer with a turns ratio of 100:1. What percentage of the original ty+dadm/b2-tylj7dss x;3. z0ffu 2 lenergy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W linet7+rdwjke + x:qsb /i( at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead oib7xk+e w+ tqrs/:(jd f 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 generator2v 6u 8:5d,q2rxqwu5yys fi vc is 440 V at 20 A. It 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 thecy6sw 2fyqi q,ur:2 xudv v558 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 tt;gge,1eg r. dxpn*x- he coil's magnetic1 ggde*e;tx- ,n.xpg r 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 and an 18-H inductor. Wha,prr68anrncuo )1 lojs ;47bi t is this circuit's timer7n;ibrnsur 4poo, a1j)c 68l constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wherf0z*dl6 n,p dee the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the pdv:. q unu6jit,wl+:aeak 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 resis )*:7xjr x,hqll*w bsei ,s6b07fopnqtance of the lampbhx*)r :l w,qq,o07s7 p jnie*lfx6bs?

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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 cu 1r: o8xdkw82ui*ogf5lakj*p rrent through the grl1ku*x8w fkod 5o2:j8ai *presistor?

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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 cok) mwha cg,1)mnnected to a 120-V ac power supply. What is the power dissipated in the resistkah,m)m ) gw1cor?

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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 resisjpv xzc1t / ;m;v13o 6qz rs1a(am:pzdtor 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 resistor ;rpej55h w ip/z4 )hbs sso5:sis $I = 0.80 \sin (240 t)$. 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 is qrj o254 xpzbkv ysa) p4r:2*v$I = 0.80 \sin (240 t)$. 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 induxu-zqb hyvk+f0i, c9.ctor 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 reac4)v j 6 dcz5y*i/hlhz yj*yf6ptance 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 asz 6n n jr1rpyp347s3have 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 157p8fqw+/ en/ l8;peqdf 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 frequency ofw z.p/cdh:,cv 20 kHz is applied to itc/: cwz.vp ,dh?

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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 r77yp1sbt go ic-;5xh9ah s(ma 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF ca,ku0kz*z+ju qpacitor 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 reactance f.d7 ,v,4xjxzkl0 gbdat 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 reactancez;ml 260kagjv 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 will7z 2zc u xme0n)h-zwg- the capacitive reactance of a 0.010-mF capacitor be 100 W xwzz-g ch2uem-0z 7)n?

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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 capacitor at nh0ms0rd w2 ,fu99qwtrd( t r+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 cir t()j5kysp mvec qw:h .-lp9/icuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti p-pc/q5wk.sh v)9 jtye(il: mve 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 impedl 6z.40,skc nytmjn6 l3 yvhi(ance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectelnslj 40,znc 6ity.kh( m3y6vd in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W2 dr7)jg7 pmlm resistor, 20-mH coil, and 1.0-mF capacitor are connecrmp j772ld)g mted 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 jk re 3ro-+)rha 20-mH inductor, what is the impedance a3r- k )jer+rhot 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 connecqm:-umt,(nkwbqq b06cs6.in ted in series with a 20-mH inductor, what is the phase angle at 1000 H(:smtq b0bq-n6i , qnuwc6k.mz?

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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 6 nrao;cvn7 dfq (f3t5svog(; a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at (g6 foqfor n7 (5n;dcsav;v3t 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistowv-bpdbrt 2i kdvwob );,21 3z t3jxp,r and 15-mH coxoptz;bb tdwwi2) ,v-kd2pjv1 3,3rb il to 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 450-mHa( 188mh 1fqxd trk0)4hlmyel inductor at 5000 Hz for a total mtaxm8dl (yreh1kf0 8)q 1lh4impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series wiuols ..+ q1v6uipz0kti0 sn1y/ ta qi8th a 100-kW resistor at 1.0-MHz for a total impedantvsn+ .i 1 yq8qkuou6sli. tp 00ai/1zce 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 series with a 20-mF capacitwkwt/0 iw*7/ aya/ osjor. What is the impedance at 1///so wtj ywik0w7*aa000 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 ingyam+8( -oye.f btams-so3+sjf6)qi jql- a: series with a 10-mF capacitor at 1.0 kHz for a total gs6+(-la jmsyq.f8jb)- -: o3oma qf+iysta eimpedance 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 capach+3uu- gnm bd6o(tpr4 itor at 1.0 kHz for a phase angle or-doh g4+(p3tu mu b6nf $40^{\circ}$?

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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 withvm,lm:g/ jnu7eni1 +daps -n3 a 30-W resistor at 1.0 kHz for a total 1 mnl7s/+-3u a:dgn nmvei,p jimpedance 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 100-mF cap-n8m m b8e8-behc);g oenev2aacitor at 120 Hz. What is the phase - naeev8-eob h)2 gm nc8b;8meangle?

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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 Hw:r)/ kagka 0wz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connwar) 0wk/g:akected 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 urepp)8 g j1df47s gjiv; 97g( afup*la 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is j(p7)18pdfgji pu sae4f urg79lg*;vconnected 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 capac+y, b qj *nh +voze/e0lrno3+citor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to re+ qyv3lo+n+/ h*e c0j,b znoa 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, c v(y9*+o9 pi ip*otd4p(r psvm /fo1sa 10-mF capacitor, and a 0.45-H inductor, wh vtp1pfy * os+9(svorp(d*9p4 comi /ien connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resisteae7ogqx2pg);futa 0jfiy.g 8h,- (n or for a phase angle of fuyg ,2n8gf( -oaix7egej;a0)hqpt. $40^{\circ}$ 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 *rw-s )og:f* r+2wwd l1/ty insfunb:has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit i +dw w:g1:yf/n*-blot nu r*w r)2ssfbe driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power ouwugq msj7v:72tput in an ac series circuit with 12.0 W resistance, 15.0 W induct gmvqu7jw:s 27ive reactance, 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 a*o hc g*itc5 qja;(i:fn 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 resistancb2 b :+3d:copvom; /xzg;hrvae of 30 W. What is the powerh bcr2;o; v: zo:+gp3mb/xdav factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series Ro6ym nukw(w3 ct q1r82LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suw k1q(2y 68wucnm rot3pply?

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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 capacit0couto-m7 nu t ntg5(0or and a 15-mH coil in series?-nn5ot 0u0t(t7cmo gu

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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 capacitor for a4 9(snu( dkb ra2u)0ddhkalr, resonant frequency of 10 kHz?u)4 lkd9na0auk (hbs rd,(dr2

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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 s s87r imurn50bh-wjq- j83 vrnwg;o;j eries with a 3.7-mH inductor for a resonant frequency of 1000 Hr-;;hij3ju 7 ow v8q-r5 8j sr0mbgwnnz?

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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 resistorl8voplp:: e( f and a 40-mH coil if the resonant frequency of the circuit is :ofpe:vll( 8p to be 1000 Hz?

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